将直方图分成两个区域

Question

我想将直方图分成两个区域（通过获取直方图图像的平均强度值）。

hR = imhist(redChannel); 
minRed = min(redChannel(:)); 
maxRed = max(redChannel(:)); 
avgRed = (minRed+maxRed)/2; 
hlowR = hR(1:avgRed); 
hhighR = hR(avgRed:256); 

hlowR给出值但hhighR为空。我不知道什么是错的。请帮忙。由于

Answer 1

hR = imhist(redChannel); 
% minRed = min(redChannel(:)); 
% maxRed = max(redChannel(:)); 
% avgRed = (minRed+maxRed)/2; 
avgRed = mean(redChannel(:)); % get mean directly 
hlowR = hR(hR<=avgRed); % Logical index to find all values below the average 
hhighR = hR(hR>=avgRed);% Logical index to find all values above the average 

您正在使用avgRed直接作为指标，而你应该检查的hR值是否高于或低于它，使用logical indexing。