White Paper Monitor Range Tone Mapping WDR Image Range
Typical monitor range is much narrower than that of the WDR image. Tone mapping reassigns pixel brightness to make the image displayable.
WDR scene in which the highlights correspond to the bright outdoor scenery while the shadows correspond to the indoor space. If the overall brightness range of the outdoor areas is
range of the dark indoor areas while preserving the local brightness variations in both areas, the overall appearance of the scene will remain perfectly acceptable to the human eye, while the image becomes displayable on a monitor.
COMPARING PERFORMANCE OF WDR CAMERAS It should be noted that tone mapping combined with the multi-shutter image capture is a highly nonlinear process
appearance even with relatively small changes in the scene. This makes it especially challenging, and requires a great deal of technical expertise, when comparing the performance of different WDR cameras. In particular, care must be taken
ratios, are identical, and the apertures are the same. Further, it is important to always look at the entire captured WDR image, and not at a cropped fragment of it post-capture, for example, showing only the bright areas. This is because the appearance of the bright area in terms of its overall contrast, noise content, and its brightness may be entirely different depending on the content of the rest of the WDR scene. If there was a large dark area in the full scene, the appearance of the
brightness, and noise, as compared to a scene without a large dark area. Unfortunately, it has become a common practice to present WDR images cropped post-capture, which makes it impossible to judge camera performance.
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PANORAMIC WDR The combined effect of tone mapping and multi-exposure image capture becomes especially challenging when it comes to achieving a uniform panoramic image appearance in a multi-sensor panoramic WDR camera. Adjacent parts of the scene captured by individual image sensors may appear entirely different in terms of brightness, noise, and contrast, just because there is a slight change in scene content from sensor to sensor. In order to produce a more uniform
range in some of the channels of the multi-sensor camera or perform an additional elaborate post-processing to equalize the appearance of the resultant multiple WDR images.
Typical WDR Scene
Incorrectly Exposed
Reference Channel
Correctly Exposed
Uniformity Achieved
Reference channel properly exposed but other channels may not be.
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Incorrectly Exposed
Correctly Exposed
Correctly Exposed
Correctly Exposed
Non-Uniform (No Reference Channel) but achieves proper WDR capture.
Correctly Exposed
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