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

Question

Selva Karna 2017-8-2

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https://ww2.mathworks.cn/matlabcentral/answers/351217-how-to-extract-nearest-pixel-value-roi-by-selection-of-reference-pixel-on-a-image

评论： Binu 2017-8-3

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Answer 1

Swarooph 2017-8-2

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https://ww2.mathworks.cn/matlabcentral/answers/351217-how-to-extract-nearest-pixel-value-roi-by-selection-of-reference-pixel-on-a-image#answer_276530

在 MATLAB Online 中打开

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

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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 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.

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