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darkest pixel in image

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nagini
nagini 2013-2-26
i want to get the darkest pixel in an image. the histogram represents the tonal distributions. the pixels that are darkest of all will be at the first line in histogram. how to get the pixels values that are in the darkest gray levels from an histogram. Please anybody help me.

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采纳的回答

ChristianW
ChristianW 2013-2-26
X = rand(100);
[C,I] = min(X(:));

更多回答（1 个）

Tijmen
Tijmen 2013-2-26
If you only have a gray-value image, then the following command will suffice:
darkestPixelValue = min(image(:));
If you have a color image, you first need to convert it to gray-values:
imageGray = im2gray(image);
darkestPixelValue = min(imageGray(:));
If you also would like to find the indices of the pixels in the image, you can use the following command:
[rowVal, colVal] = find(image == darkestPixelValue);
This returns an array of row- and column values corresponding to points at which the pixels are darkest.
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Image Analyst
Image Analyst 2013-2-26
Right, just remember not to use "image" as the name of your variable. Call it rgbImage or something so you don't blow away the built in image() function.

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