How to convert two rgb images into grayscale? and then subtract ?

Question

swati mane 2019-3-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/450695-how-to-convert-two-rgb-images-into-grayscale-and-then-subtract

回答： Image Analyst 2021-6-19

I have two images in jpg format(one as reference image and other is captured image) . I want to convert them to grayscale and want to subtract them. How to do this?

Thanks in Advance.

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Jan 2019-3-19

@swati mane: Does this comment concern my answer? Is your problem solved?

swati mane 2019-3-19

Hello sir,

My problem resolved. thank you!!!

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Answer 1

Jan 2019-3-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/450695-how-to-convert-two-rgb-images-into-grayscale-and-then-subtract#answer_365887

在 MATLAB Online 中打开

img1 = imread('Image1.jpg');
img2 = imread('Image2.jpg');
D    = rgb2gray(img1) - rgb2gray(img2)

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Hamza Mahmood 2021-6-19

thank u so much

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Answer 2

Image Analyst 2021-6-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/450695-how-to-convert-two-rgb-images-into-grayscale-and-then-subtract#answer_728660

在 MATLAB Online 中打开

If you don't want negative numbers clipped to zero you can cast to double before subtracting

image1 = imread('Image1.jpg');
image2 = imread('Image2.jpg');
diffImage  = double(rgb2gray(image1)) - double(rgb2gray(image2));
imshow(diffImage, []); % Make sure you use []

If you just want the absolute value of the difference, use imabsdiff():

diffImage = imabsdiff(image1, image2);

No need to cast to double in that case.