彩色图象的二维直方图源代码

function varargout = rgbhist(I) %RGBHIST Histogram of RGB values. if (size(I, 3) ~= 3) error('rgbhist:numberOfSamples', 'Input image must be RGB.') end nBins = 256; rHist = imhist(I(:,:,1), nBins); gHist = imhist(I(:,:,2), nBins); bHist = imhist(I(:,:,3), nBins); hFig = figure; h(1) = stem(1:256, rHist); h(2) = stem(1:256 + 1/3, gHist); h(3) = stem(1:256 + 2/3, bHist); set(h, 'marker', 'none') set(h(1), 'color', [1 0 0]) set(h(2), 'color', [0 1 0]) set(h(3), 'color', [0 0 1])