Read brightness level of the video

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Ayesha
Ayesha 2014-2-27
评论： Ayesha 2014-2-28
Hello,
I have been wondering about it and tried searching for software that could basically give me the maximum brightness value of the video. The video duration is 20 seconds and I just want to know the maximum brightness value. Could this value be obtained using matlab? If so, how would it be?

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回答（1 个）

Walter Roberson
Walter Roberson 2014-2-27
rgb2gray() gives you the brightness values of each pixel. Then you can max() that to get the maximum for the frame.
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Walter Roberson
Walter Roberson 2014-2-27
You do each frame in turn. If you store the maximum intensity for each frame into a vector, then the maximum intensity for the video as a whole would be max() of that vector.
Ayesha
Ayesha 2014-2-28
I've been using this code to find the maximum brightness within the image which is basically the summed up bright of RGB components. It works, however, I would like to find the one brightest pixel from the entire image which this code does not really give. What do you suggest?
I = 'myImage.jpg';
S = sum(I,3) ;
[rows columns] = find(S == max(S(:)))

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