July 2015
Intermediate to advanced
174 pages
3h 45m
English
Content preview from OpenCV Computer Vision with JavaBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Histogram equalization
The human visual system is very sensitive to contrast in images, which is the difference in the color and brightness of different objects. Besides, the human eye is a miraculous system that can feel intensities at the 1016 light levels [4]. No wonder some sensors could mess up the image data.
When analyzing images, it is very useful to draw their histograms. They simply show you the lightness distribution of a digital image. In order to do that, you need to count the number of pixels with the exact lightness and plot that as a distribution graph. This gives us a great insight into the dynamic range of an image.
When a camera picture has been captured with a very narrow light range, it gets difficult to see the details in the ...
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