How to extract nearest pixel value [roi] by selection of reference pixel on a image?

3 次查看（过去 30 天）
Selva Karna
Selva Karna 2017-8-2
评论： Binu 2017-8-3
How to extract nearest pixel value [roi] by selection of reference pixel on a image?

请先登录，再回答此问题。

回答（1 个）

Swarooph
Swarooph 2017-8-2
Use the impoint function.
Example:
img = imread('peppers.png');
figure;imshow(img)
h = impoint(gca,[]);
position = wait(h); %Double click on a pixel in the figure window
pixelLoc = round(position) %Get nearest pixel location
img(pixelLoc(2),pixelLoc(1),1:3) %Use pixel location to index into RGB image
Result:
pixelVal =
(:,:,1) =
158
(:,:,2) =
50
(:,:,3) =
56
  2 个评论
Selva Karna
Selva Karna 2017-8-3
Hi Swarooph , thanks for answer , actually my question is extract nearest pixel [ROI] its means region so , how to extract region by selection of pixel value?
Binu
Binu 2017-8-3
Swarooph's answer gives you both the pixel position(x,y) and pixel value. If you are looking for a ROI and not just a pixel, try imrect or imellipse. They both use the imroi class and functions are similar to impoint.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Image Category Classification 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by