Question

我想提取图像大小为(p*hight,p*width,3)的矩形区域。 p是[0,1]之间的双重值。

以下代码有效，但我想知道是否有更好的方法来实现这一目标？

img = imread(ImageName);

% size parameter
p = 0.5;

% store image size
hight = size(img,1);
width = size(img,2);

% calculate the center of the image both in width and hight
% used as reference
centerHight = floor(hight/2);
centerWidth = floor(width/2);

% use half of the actual size of the rectangular region
halfHight = floor(p*hight/2);
halfWidth = floor(p*width/2);

% start index for hight and width
startHight = 1 + centerHight - halfHight;
startWidth = 1 + centerWidth - halfWidth;

% end index for hight and width
endHight = centerHight + halfHight;
endWidth = centerWidth + halfWidth;

% extract center pixels
CenterPixels = img(startHight:endHight,startWidth:endWidth,:);

是否有任何matlab命令可以获得相同的结果？也许只指定矩形和图像中心的大小？

Answer 1

如果你有Image Processing toolbox，你可以使用imcrop函数和一些数学：

[nl, nc, ~] = size(img);
CenterPixels = imcrop(img, [[nc nl] * (1 - p) / 2 [nc nl] * p]);

编辑：或者您可以这样做：

[nl, nc, ~] = size(img);
CenterPixels  = img(nl*(1-p)/2:nl*(1+p)/2, nc*(1-p)/2:nc*(1+p)/2, :);

在matlab中获取图像的中心像素

1 个答案: