How to calculate the low and the high value of the threshold (histogram) ?

can you help me, which function allows to calculate the low and the high value of the threshold (histogram)like the following histogram

Answer 1

[KSSV]

doc min and max. Also see this code by Image Analyst

[pixelCounts, grayLevels] = imhist(grayImage);
minGrayLevel = min(grayImage(:));
maxGrayLevel = max(grayImage(:));
% or
minGrayLevel = find(pixelCounts > 0, 1, 'first');
maxGrayLevel = find(pixelCounts > 0, 1, 'last');
minCounts = min(pixelCounts(:));
maxCounts = max(pixelCounts(:));