Getting the (HSL conversion) Lightness average Value from an image

asked 2018-09-05 06:26:52 -0600

zms
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Hi, I have hundreds of images that need to analyze to get the max and min value. What is the best way to get the max and min value for lightness value? I had tried the example for the histogram as for this link

link for histogram

I only select channel 2 as the conversion is at HLS, channel 2 is the L.

The question, am i correct by doing like this to get the Ligtness value? If i do the histogram for RGB without conversion, it also have the same answer for Green Channel (2). I think I'm not correct.

Any input?

Thanks

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sorry your question is not clear! Do you want to find the min & max value of a HSL image? or a BGR Image? Are you computing Histogram to find the Min max? Then you are wrong? Have you looked at this cv::min & cv::max?

Balaji R ( 2018-09-05 08:03:45 -0600 )edit

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Mat bgr = .... ? Mat hls; cvtColor(bgr, hls, COLOR_BGR2HLS); Mat L; extractChannel(hls, L, 1); // find min / max: double m,M; minMaxLoc(&m,&M, 0,0); // find mean / stddev: Scalar mu,dev; meanStdDev(L, mu, dev); double mean = mu[0];

Getting the (HSL conversion) Lightness average Value from an image

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Getting the (HSL conversion) Lightness average Value from an image