將直方圖分成兩個區域

Question

我想將直方圖分成兩個區域（通過獲取直方圖圖像的平均強度值）。

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

hlowR給出值但hhighR爲空。我不知道什麼是錯的。請幫忙。由於

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直接作爲指標，而你應該檢查的hR值是否高於或低於它，使用logical indexing。