发布：交互查看图像中选中点邻域r内的像素值，并返回选中点及像素值

function [pts, colors] = imgPointSample(img, r)%从图像中按输入点采样%采样大小数据：(2 * r + 1) * (2 * r + 1) * 图像色彩通道数%采样结果：像素位置存放在pts中，像素位置及区域像素值存放在vals中  imagesc(img);  [h w c] = size(img);  hold on;  pts = [];  colors = {};  while 1      [y, x, btn] = ginput(1);      x = round(x) + 1;      y = round(y) + 1;      if (x < 1 || x > h)          continue;      end;      if (y < 1 || y > w)          continue;      end;      if (btn == 3)          break;      elseif (btn == 1)          pt = [x y];           pts = [pts; pt];          pixels = img((x-r):(x+r), (y-r):(y+r), :)          colors{end + 1}{1} = pt;          colors{end + 1}{2} = pixels;          plot(pts(:, 2), pts(:, 1), 'or', 'MarkerSize', 2 * r + 1);      end;        end;  hold off;end

用法：

img = imread('x.bmp');

[pts, vals] = imgPointSample(img, 3);