What does hdr mean for android. What is HDR in the phone?

High Dynamic Range (better known as HDR) photography is a popular and often misunderstood imaging technology. In this article, we will take a look at what HDR is, learn how to use it to get good results, and give some inspiring examples.

Maximum dynamic range

The dynamic range is a value that characterizes the signal to noise ratio.

Translator's note - simply put, the dynamic range determines how wide a range of brightnesses a camera is capable of transmitting without loss in a single shot.

Any photograph has many tones: some areas are bright, then a series of shades of gray, and then places surrounded by a shadow. Sometimes the difference between light and shadow can be incredibly sharp; we call it "high contrast."

Your camera is optimized for limited dynamic range. Details above and below its limit will be brightened to bright white or suppressed by noise in dark areas. The magnitude of the difference between black and white that the camera can capture determines the many photographic decisions that need to be made to get a successful shot.

It’s difficult every time to expose everything correctly: in some pictures there are shades of black andwhite, exceeding the capabilities of the camera. In such high-contrast images, the tradeoff is often the right decision. You choose an exposure that “protects” shadows or highlights, whichever is more important.

However, in some situations it is possible to use smart post-processing techniques to take pictures that exceed the standard camera capabilities: we use HDR.

Poor, misunderstood, slanderous HDR

If you compensate and try to achieve a high dynamic range, you can often get unnatural, oversaturated pictures at the output. Unfortunately, this is where the negative reputation of HDR comes from. Usually the abuse of this method is manifested when shooting architecture and partly in industrial tourism; in these areas he became a bit of a joke and a subject of many ridicule.

Tone mapping

I heard somewhere that tone mapping and HDR are interchangeable, but it's not the same thing. Tone mapping is a technique used for HDR photography.

Tone compression enhances contrast, but at the same time (theoretically) retains detail and color. This can be done in two ways, globally, when each pixel is matched the same way, or locally, when the algorithm is configured for each pixel depending on the surrounding tones and the image itself.

With light to moderate use, you can improve the picture. If it is used incorrectly, you will intensify problems such as noise and dust spots on the sensor, create contrast rings and unnecessary shine. A delicate balance is required here.

What do you need

HDR effect can be achieved using any equipment, as its essence lies in the subsequent processing. Ideally, you should have a camera that allows you to shoot in RAW format to get the most out of your shots.

Exposure Bracketing

AEB  - Another useful feature. This abbreviation stands for auto exposure bracketing  (Automatic Exposure Bracketing) and adjusts the camera so that you can take a picture with several stops of exposure. For example, you can set the parameters EV: -2, 0, +2. With these settings, pictures will be taken two stops lighter and two darker.

The idea is that you get the best possible chance to get the first shot with the correct shadows, the second with excellent halftones and the other with the right bright areas. If you combine them, in theory you should get a perfectly exposed photograph with a wide dynamic range.

This can be achieved without function. AEB, but then you will need to manually adjust the settings. It also increases the risk that the camera will move during shooting or something in the frame will change.

Tripod

This is also not a mandatory, but very useful thing. A tripod will allow you to hold the camera still while it takes pictures with different exposures. Even hard-handed photographers have a pretty hard time holding the camera for exactly a few shots.

HDR post-processing software

Prices for software that can properly mix HDR shots vary greatly. The popular Photomatix program is sold in two versions, its cost starts from $ 39. If you already have Photoshop or Lightroom, you can use both of these programs to work. If you do not have any of the above and prefer free options, there is open source software called. This program has several blending modes and will be a great starting point. You can also use the very popular (and recently become free) Nik Collection  , which includes the ability to mix different exposure or tone settings from a single exposure photo. However, this is not real HDR and the same amount of detail can be obtained when making corrections in RAW format.

Inspiration

Chicago Center

I can’t say for sure that this HDR image looks natural, but I also can’t call it picturesque and oversaturated. I really like the limited color palette and the warmth that envelops the buildings. For me, this picture looks almost like an interpretation of the city by a graphic designer, and the absence of people on the street only gives it an advantage.

Red mountains at sunset

You can bet that the original picture (s) had very dark shadows in the area of \u200b\u200btrees and cliffs, as well as strong light in the sky. In the final image, everything is well balanced and the details that have appeared in the sky due to this look simply excellent. As for me, green and red could be softer - not so saturated and a little bit darker - but everything else is a great shot.

Irish cliffs

Although the “Avoid Moving Objects” tip is usually very useful for HDR shooting, I find the grass pulled by the wind came out great here. She looks soft and gives the illusion of movement - I’m sure you can almost feel the fresh wind walking on the top of this cliff!

City Lights at Dusk

Shooting compositions in which there are lights is my favorite thing when it comes to getting the most out of the dynamic range. The warm glow on the water looks very nice, and the city is sharp enough to stand out and attract attention, but at the same time not look unnatural.

Sunset in st louis

Sunrises and sunsets are a wonderful time of day if you want to show different colors and tones. Using multiple shots with different exposures will give an excellent range, in part because the light changes all the time.

Compromise

Just like blending or tone mapping, some presets and effects can give your shots an HDR effect. Below in the text is one of my photos. The raw RAW file looks pretty flat.

Image: Marie Gardiner

I used a set of Photoshop actions Dramatic Landscape Action from Sodasong. Among other things, there is an HDR effect. Obviously, this cannot be real HDR, since mixing or tonal mapping is not involved here, but this effect claims to repeat the result of its work.

When I launched the action, he created a mask so that he could hide unwanted areas, and then added layers for sharpness, brightness, contrast and color. All of them are non-destructive, so you can return to the original photo at any time. This also means that you can adjust each layer until you get the desired result.

I decided to leave the initial settings so that you can see the result immediately after starting the action.

Result After Launch

You can see how we enhanced the colors, as well as emphasized sharpness and contrast. Among other things, the plugin brightened bright areas and darkened the shadows.

The left part is the image before, the right - after.

Result before (left) and after (right)

This is a very good result for a one-click action. The difference is barely noticeable, but a poor result is ideal when it comes to HDR. You can consider that you have successfully applied HDR if the result looks normal, harmonious and natural.

If you don’t have much time or you just want to adjust the picture, the action is ideal: it can be quickly launched, it makes light corrections and does not go beyond. This is exactly what you need - the action allows you to freely make your edits.

Technics

Exposure setting

You will need at least two shots, but it is better that there are three: the first with normal exposure, the second for shadows, and the third for highlights. Setting the bracketing mode ( AEB) cameras and use high-speedburst mode allows you to easily get the shots you need.

Do not forget that you cannot change settings between shots. Ideally, this means that you should shoot manually so that the camera does not change the ISO or aperture settings.

Avoid moving objects, which after gluing photos can become phantoms. Even tree branches swaying in the wind will cause problems, so pay attention to the subject and what is happening around.

If you are going to take the same pictures one after another, it will be useful to separate them with a photograph of something else, so that you can easily determine which images need to be grouped. I usually photograph my hand, so I can easily notice the separation even among the thumbnails.

Do not overdo it with exposure

When working with AEB, do not make a big difference unless you take a lot of pictures. For most situations, just three shots are enough to get an excellent HDR effect. Avoid extreme combinations, for example, [-5, 0, 5]; instead, choose a difference of one, two or three stops. If you take more pictures, you can take larger values.

Again, again, bracketing with one or two stops is usually sufficient, especially for the RAW format. When photographing people, it may be worth taking pictures with a difference of one. For high-contrast photographs, such as skyscrapers or landscapes, you can increase the difference to two or three.

Mix photo

As I said earlier, every program that can handle HDR photos has different functions and options, but the general approach is always the same.

The software will ask you to manually enter the exposure values \u200b\u200bfor each picture if you can not automatically recognize it. Also, such software usually has functions Chromatic aberration corrections  (Correct Chromatic Abberation), Noise reduction  (Reduce Noise) and Phantom Reduction  (Reduce Ghosting). All this can be very useful for solving common problems when working with HDR, so do not hesitate to play around with the sliders to evaluate the positive effect.

After you have configured the settings to your liking, the program will mix the images into a single 32-bit image, which most likely will look awful. This is normal, do not worry. Next up is the tone mapping. At this stage, you will make corrections to adjust your photo - choose whether to strengthen the details, where to reduce or increase the saturation and adjust the compression.

Potential problems

Traffic

Since you need at least three shots to get an HDR image, it would be wise to avoid movement. If something moves, even tree branches in the wind, it is obvious that in the photographs this object will turn out differently and in the end will look blurry or strange.

Saturation Too High

If the scene is full of high contrast colors, using HDR will enhance this, often to the detriment of the photo. It may be necessary to bleach the image after processing to remove excess saturation. Also with areas of low contrast or color - as a result, you can get a flat, blurred look.

Computer speed

If you process many large RAW files, the computer may begin to slow down. Make sure that scheduled updates do not interfere with processing and there is enough free RAM to work. Modern computers do a great job of editing large volumes of photos, but there is still a risk that the program may freeze if requests are too serious.

1. Use a tripod to hold the camera steady.
2. Turn on mode AEB.
3. Do not put too much exposure difference. Choose no more than two or three stops.
4. Take more pictures for a wider dynamic range.
5. Use HDR software tools and work wisely, avoiding the picture that is often associated with HDR.

Resources for further study

How to take long-exposure HDR photos: Long-exposure HDR shooting is the same as regular HDR photography, but it takes longer exposure time. This creates a very specific effect. Objects such as water or clouds become clearer due to slow shutter speeds that blur their movement. Moreover, for the correct exposure, say, of the night sky, you need a high shutter speed.

Slow Motion HDR with SNS-HDR Pro: How to shoot and process slow motion video in HDR.

findings

HDR shooting is often underestimated and photographers can be a little boring when they talk about it. Do not let these opinions push you away, if used correctly, this technique can produce amazing results. In the best shots, it's even hard to notice the work with HDR.

The key to great images with a wide dynamic range is to take the best possible source shots. This means that you should avoid moving objects (otherwise you can get a phantom effect) and take more photos with a not very big difference in exposure, getting the most out of the dynamic range.

When mixing, do not stop at the standard settings. They are a great start, but no more: it is worth playing with the sliders until you start to feel comfortable and understand what they are doing and what effect they help to achieve. Remember, the smaller the better, and although you are trying to get the most out of tonal ranges, it is worth keeping the effects of saturation, structure and sharpness at a minimum for a realistic look.

Some of the users, taking photos using their smartphones, may encounter mode in the camera settings HDR. Many simply do not pay attention to it, but in vain, because this mode has a bunch of advantages, which many smartphone owners simply do not know about. In this article I will tell you what HDR is in the phone, explain when it should be used, and what are its main functions.

HDR stands for High Dynamic Range, which is a measure of the lighting spectrum at various levels. For example, the human eye has a high level of dynamic range, we see many details of a dark building against a bright sky, but if you take the same building using a smartphone, then in the photo this building will turn into one dark spot, on which most of the details are simply lost .

Accordingly, the dynamic range determines the amount of contrast that can be displayed on the photo without loss in detail.

Trying to avoid losses in quality, many photographers try to photograph only the dark or light parts of the image. Well, what if we could manage to take pictures with an emphasis on the light, and then on the dark parts of the image, and then organically combine them into one balanced image? This is exactly what the HDR function does.

If you do not know what Teletype is in your phone description.

How to use HDR

Activate the shooting mode of your phone, then go to the settings option (gear icon), go to “Effects”, and select “HDR” in the shooting mode.

Then point the phone’s camera in the center of the screen and shoot. Remember that in HDR mode the shooting process takes a little longer (the device takes several photos with different exposures), therefore there should not be any movement of objects in the lens, and the phone itself should be kept almost motionless.

If your phone does not have this HDR mode (older model), then you can install third-party applications that allow you to work with HDR. I would recommend applications like Camera HDR Studio, HDR Camera, Ultimate HDR Camera, Snapseed and others.

What it is and how it looks to work with HDR can be seen in the video:

When to shoot in HDR

HDR mode is designed to produce high quality images in certain situations. Here are the cases when you should not only know what HDR is, but be able to use it:

When not to use HDR

However, in some situations, using HDR can make your photo worse. Here they are:

• Photo with motion.If an object moves (or will move) in the field of the frame, HDR increases the chance of getting a blurry image. Remember that usually HDR creates three photos, and if your subject moves between the first and second shots, then in the final photo you can get something awkward. I hope you began to understand that this is HDR and when to use it, and when not;
• High contrast scenes.Some photos look better with strong contrast between the dark and light parts of the exposure. Using HDR may make contrast less noticeable, and this may adversely affect the image;
• Bright colours.Using HDR when shooting images with vivid colors can cause the resulting photo to “fade”.

Conclusion

What is HDR in a smartphone?  Using the HDR mode on your phone can add harmony, good detail and balance to your photo. Use the HDR mode when shooting landscapes and stationary objects with great detail, while avoiding the use of HDR when shooting movable objects - and your photos will always delight you with their quality and aesthetic appearance.

The desire of smartphone manufacturers to make their products more attractive to customers has led to the fact that it is now quite difficult to find a device that does not have an integrated digital camera. Dozens of megapixels, complex image processing algorithms, automatic range adjustment ... It would seem that just select the desired frame and press the button, and the rest will be done by automation.

Unfortunately, this is only partially true. So, for example, an attempt to shoot a building against a bright blue sky will lead to a general excessive dimming, since in this case the brightest element is selected for the reference point, relative to which the remaining parameters are set. If you interfere with the operation of the algorithms and manually specify the exposure, the result may be a building with an acceptable brightness in the picture, but with a white spot instead of the sky. To overcome this, a special HDR mode is used, implemented in almost every modern digital camera, including models in smartphones. By learning to work with him, you can be sure that the quality of the pictures will be perfect. This abbreviation stands for dynamic range extension. Thus, the question: “in the phone’s camera?” Can be answered as follows: “This is a special function of processing frames, designed to improve images by combining one final of several intermediate ones.” In general, quite an interesting opportunity, with which every owner of a modern smartphone is simply obliged to get acquainted.

What is HDR in the phone’s camera?

In fact, the principle of operation of this mode is quite simple. HDR shooting assumes that the camera does not take one, but several frames at a time, while focusing on objects with different levels of illumination.

Then the central processor selects pictures with averaged values \u200b\u200band combines them into one, which is offered to the user. Thanks to the application of this simple method, one can forget about objects that are too bright and not bright enough in one frame - everything is in balance. Since this solution is completely software, for its use it is enough just to install an application that has a similar shooting mode. Note that not all cameras preinstalled in the basic firmware of smartphones have this feature.

The nuances of using

At the same time, it is important to understand that the HDR mode is still not a panacea. Even using it, the owner does not become a professional photographer. The main problem is the following: since the final image is formed from several intermediate ones, the apparatus itself and the objects in the frame must be motionless.

Otherwise, an unpleasant HDR effect may occur, in which everything in the picture looks blurry, doubles, etc. When using this mode, it is recommended to use a tripod.

The next feature that should be taken into account is that in some cases, obtaining a picture with an average brightness is inappropriate. For example, the silhouettes in the twilight, as conceived by the photographer, should remain the same vague shadows, and not people in gray cloaks. HDR shooting does not allow to realize this.

And finally, the brightness and contrast of pictures taken in this mode, in general, are slightly lower than in photographs taken in the usual way. Sometimes this is very critical.

HDR Pro

Within the framework of the article, it is useless to try to describe all existing programs for smartphones in which the shooting mode with an extended range is implemented, since their number is in the tens.

We indicate only a few. One of the most famous programs in this group is the HDR Pro Camera. Despite the fact that the release of new versions has been discontinued (the latest is 2.35), reviews about this application are the most flattering. An additional plus is guaranteed performance even on the outdated "Android 2.2", which for some may be a decisive factor. After starting, the user has the opportunity to choose automatic or manual mode. In the second case, you can pre-adjust the brightness, contrast, color temperature with which the pictures will be taken using the sliders on the screen. The program is distributed on a paid basis, but the cost is very affordable - less than 60 rubles.

SNAP Camera

Perhaps everyone who asked to choose a good program for photographing, came across a solution from the developer Marginz Software. Snap Cam is very popular among many, due to several factors. Among them are support and timely release of new versions; some features are unique; The program includes almost everything that can interest both professional and novice photographers. In particular, it is precisely when working with it that it is easiest to understand what HDR is in the phone’s camera. To activate the mode after installation and start up, you must select HDR by rotating the graphic settings wheel (version 7.x.x). It remains to take a picture. By default, three frames with different exposures will be saved, among which you can choose the best. The function of saving intermediate images, if it is not needed, is deactivated in the settings - HDR section. In this case, the entire shooting process takes place completely automatically, except, of course, pressing a button. Fans of "playing around" with the settings may be interested in focusing between intermediate frames, as well as milliseconds of delay. The program allows you to adjust the clarity, brightness, resolution of images, cropping, etc. It is assumed to purchase a license.

Basic functionality

The demand for HDR mode has led to the fact that more and more manufacturers of smartphones have begun to include in their operating systems an application for working with the camera, which initially provides the ability to take pictures with an extended dynamic range. However, when using stock (basic) solutions, there is no need to talk about the abundance of any additional settings. For example, in the popular CyanogenMod assembly, clicking on three menu call points opens a window where you can enable or disable the use of HDR mode. Parallel operation of this function and flash is not possible. It is worth noting that very often an inexpensive shooter in the usual mode allows you to get better photos than more expensive, but with a low-quality matrix.

"Open camera"

That's what Open Camera is called an application that also deserves the closest attention from photography enthusiasts. There are no less settings in it than in the above Snap. True, to activate the HDR mode, a beginner has to study all the points in the settings. In fact, access to the “magic button” can be obtained by clicking on the dot icon in the upper on-screen menu. Among the items on the Scene list is HDR. The quality of the final image is excellent, but the processing speed is one of the slowest among similar solutions. Perhaps, in models of smartphones with productive processors, this delay is leveled. To understand what HDR is in the phone’s camera, it’s recommended in practice to choose different shooting modes and compare the result.

These are mainly DVRs, radar detectors or COMBO devices. But today it’s about the devices that shoot video files, the thing is that many have the HDR function, supposedly it improves shooting felts, photo felts, or the final file. But what she really does and what process of work, no one knows. So let's get it right ...

To get started, the definition

HDR   (or HDRI - High Dynamic Range Imaging , if translated literally, it turns out - The image is a high (extended) dynamic range) - this is an improved technology for working, or processing an image or video, mainly affecting brightness and contrast.

Speaking in the usual human language, these technologies improve the “picture” both when shooting a video or photo, and when playing the source files. If we “roughly” describe the improvements of this technology, then the dark becomes even darker and the light even lighter, the image transmission accuracy is also increased, and in some cases, contrast and brightness.

As the developers of this function assure, they increased the perception of colors from images and videos to 75-80%, although the percentage of perception is much lower with conventional technologies.

SDR andHDR

At the dawn of the creation of television and video equipment, there was one of the standards for the dynamic range of brightness and color, it was due to one of the standards of television in those days. NU couldn’t transmit the greater “color radiation” of the lamp TVs, just as the standard video cameras and VCRs could not record it - to put it very bluntly, “the technology was lame”, therefore the whole wide range of brightness and color was compressed to very standard colors transmitted our old televisions and television towers.

In simple terms, we can say that from a wide palette of colors and brightness, we perceived only about 20 - 30% (and possibly even lower)! Therefore, the first films were not as realistic as they are now.

This function was simply called - SDR — Standard Dynamic Range - that is, the standard display mode for brightness and color. This is a kind of carburetor in the age of injection technology.

But now a new and essentially revolutionary mode has appeared - HDR, as I wrote above, this function greatly increases the brightness and color transmission of our televisions, and also improves the recording of our video gadgets (DVRs, telephones) or cameras.

As i wrote above HDR   - It can give us a much more realistic picture, where the perception of brightness and color increases to 75-80%.

How does it work?

The process is quite simple, the camera takes several shots with a different color range, as well as with different brightness. Usually there can be from 3 to 5 such pictures, but you don’t see this, because all this is done automatically and very quickly. Later from these pictures, one is compiled, with improved characteristics - brightness and color reproduction. After that, it is displayed on your display or TV.

Camcorders - DVRs have already automatically learned how to improve the video image, which again should play on HDR devices.

Actually, to get maximum efficiency, you must have not only equipment that records video or photos in HDR, but also equipment on which it will play TVs, displays or gadget screens.

It is worth noting that DVRs are now developing very rapidly, video is already being shot not with HD resolution (1280X720), but often with FULL HD (1920X1080), but SUPER HD (2304x1296) or 4K (4096X2160) are not rare either. Of course, with such permissions, the detail increases, but if the street is dark or slushy, then the resolution will not help here. Need a function that will improve the picture.

This is precisely the task that HDR has, if in bright weather it does not work so noticeably, then in slush and in the dark it is simply necessary.

Improving the image of all kinds of objects - especially car numbers, pedestrians, road markings, signs and more. It is especially important to see the license plates, because at night they can be lit by the headlights of the car. It should be noted that in controversial situations (accidents), every little thing is simply necessary, therefore, the HDR function is NECESSARY IN THE DVRs!

TV and telephone

In these devices, the HDR function is used to improve the image when watching videos or to improve the display. For example, a TV improves the quality of the picture and color reproduction, but the phone uses this function both for displaying the image (that is, viewing a video, photo, browser and just a screen), and for shooting video or photo on the built-in camera.

True, HDR is not available to all gadgets, but only flagship, on cheap gadgets, the model will rise in price too much.

So it's simple, now a small roller for fixing the material.

That's all, I think it was useful. Sincerely your AUTO BLOGGER

One of the newest and most sought after technologies is HDR. It was she who made possible the maximum approximation of the image obtained through the recording device to the real one, that is, the one that our eyes see. The abbreviation stands for: High Dynamic Range, which in Russian sounds like "high dynamic range." In short, the HDR technology combines several freeze frames into a single one, for the high-quality fixation of which a different exposure would be needed, and each object is highlighted (strongly illuminated or darkened).

As for cameras, including those built into recorders for cars, the HDR mode works as follows. Consider the example of a photo of the fountain on one of the bright sunny days. The sky is so bright that it simply turns white, but the fountain comes out perfectly. If you concentrate on the clouds, then the fountain will come out so-so. HDR is designed to preserve the vitality of life and not “sacrifice” any of the details of the image. It is used, by the way, not only in cameras, DVRs, classic video cameras, but also in televisions, smartphones. Ideal for shooting in low light, but not perfect for capturing fast-moving objects.

HDR function: emphasize and highlight all the details

DVRs are being improved along with other useful gadgets. The most common video recording format is no longer HD with an acceptable image quality, but Full HD, or even Super HD (involves shooting with a resolution of 2304 * 1296 pixels). It is clear that in the latter version, the detail of the picture is simply “wow”, but if it is obtained at night or on slushy weather, high resolution will lose its position of influence on the final result. HDR in the DVR what is it? The answer on the surface: this is a function that will improve the picture obtained in adverse environmental conditions.

The question of whether to enable HDR in the dashcam disappears by itself. Indeed, thanks to him, the driver will receive a clear image:

1. road marking;
2. automobile state. numbers;
3. pedestrians, faces of other car owners;
4. prohibiting and other roadside signs;
5. many other things that can play a decisive role in the investigation of accidents and controversial emergencies on the road.

But all of the above details are illuminated by the headlights of the car (not in clear weather, of course). Plus, sunlight can always get into the lens. HDR setup is done through the menu using the function keys and display. Just select the “video recording setup” item (the name and placement may differ depending on the operating model of the recorder). HDR works exclusively in the same mode at 30 fps and a resolution of 1920 * 1080 pixels.

WDR for HDR competitor or assistant: what is the difference?

To understand what the difference between WDR and HDR is, you need to figure out what determines the efficiency of the registrar from the point of view considered. The dynamic range of the sensor, the essence of which is in relation to the luminosity of the brightest and darkest “target” in the captured frame. The unit is decibel. It is Dynamic Range that identifies the accuracy of transmitting the brightness and color of an image by eliminating distortion.

Budget DVRs, as a rule, have a narrow dynamic range (no more than 70 dB), which is why in difficult recording conditions, dimming or light appears, the contrast leaves much to be desired, which is why a number of video recording details are rather difficult or impossible to consider at all.

A multi-layer glass lens, supplemented by an IR filter, will help here, allowing for more accurate transmission of brightness / contrast of the light flux to the sensors of the matrix built into the device. In the case of direct sunlight or headlights, a so-called polarization filter (CPL) will help out. But there is one big “BUT”: the price of more equipped DVRs can bite a lot.

The creators of car devices understood how to increase the Dynamic Range, almost without raising its value - software and hardware, using HDR matrices. There are two types of high dynamic range:

1. Consistent  (from the English word “sequential”) - creates several separate frames with different shutter speeds, saving details in the brightest / darkest places. Suitable for recording on the video smooth movement and in the absence of moving objects, as they are smeared with a combination of the resulting images. Introduced into surveillance cameras (in supermarkets, for example). Requires more memory resources.
2. Chess  (staggered from English) - a common frame is formed from alternating dots (pixels) of two different exposure pictures. Just this type of HDR function is used in DVRs, it doesn’t “eat” a lot of memory and does not distort objects in motion. The minimum required frame rate is 60 fps, so HDR may not be supported by some resolutions.

So what is still more useful - WDR or HDR?

The beauty of HDR is that it increases the Dynamic Range by as much as 15, or even 18 dB! Wide dynamic range or, in short, WDR (translated as extended dynamic range) - the solution, unfortunately, is more expensive. The reason is in the matrix, its Dynamic Range exceeds 100 dB. However, thanks to him, the recorder can record what is happening in the most difficult lighting conditions without losing contrast, detail, all the same brightness.

WDR, in fact, automatically adjusts these characteristics, adjusting the exposure where it is required, i.e. darkened areas of the frame brightens and vice versa; too light - darkens. Keeping this balance ensures a high-quality video when leaving the tunnel, or entering it, when the lens is “blinded” by direct sunlight. So, now it’s clear that the purpose of these two modes is identical, just the implementation method is different.