How we can get the pixel values of an object in an image in matlab??

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halima jamil 2015-8-24

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https://ww2.mathworks.cn/matlabcentral/answers/235943-how-we-can-get-the-pixel-values-of-an-object-in-an-image-in-matlab

评论： Walter Roberson 2015-8-31

how we can get the pixel values of red line from starting to end point and return its pixel values.

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Answer 1

Image Analyst 2015-8-29

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https://ww2.mathworks.cn/matlabcentral/answers/235943-how-we-can-get-the-pixel-values-of-an-object-in-an-image-in-matlab#answer_190699

Since you posted this as a brand new question, and left out any context, you've confused the other people that answered. That's why you should have asked this in your original question where I gave you the answer: http://www.mathworks.com/matlabcentral/answers/233509#answer_189277 The answer is "maxDistance" which is in the code that actually created that red line you're showing above. Go back to your original question to see.

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halima jamil 2015-8-31

All right then just simply tell me how we can find the length of a rice grain. Except all above i just want to find the length of a rice grain.

Walter Roberson 2015-8-31

You run the code he showed you before, and the length of the rice grain is stored in maxDistance .

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Answer 2

JangHo Cho 2015-8-24

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https://ww2.mathworks.cn/matlabcentral/answers/235943-how-we-can-get-the-pixel-values-of-an-object-in-an-image-in-matlab#answer_190222

Let's say your picture has 300 x 150 pixels and RGB color. you can read the image by using imread() function

image = imread('your_pic.jpg'); and you can see the size of image by size(image). It will be 150 x 300 x 3 uint8 array. The array has 3 planes of colors RGB. You can find out what is the red color plane by imshow(image(:,:,1)) imshow(image(:,:,2)) imshow(image(:,:,3)) Now you know which plane is red color. Check the values of the pixels of the plane. if a pixel has values in red plane and there are zero values in other plane, the pixel is red. right? Maybe you should use for loop.

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Walter Roberson 2015-8-29

You cannot draw a red line in a black and white binary image. You might draw a red line on top of a black and white binary image, using plot() or imline(), but that line does not form part of the resulting image. Possibly you snapshot or otherwise capture the result from the screen: if you do that then the result will be a color image, not a binary image.

Image Analyst 2015-8-29

That's what I did. I drew the line in the overlay with plot(), AND I calculated the length of the line directly, so there is no reason at all to create some kind of image with a red line burned into it.

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