How do i scan pixel from an rgb image and then if red value is higher than 200 show red only and if its lower = all 3 colors = 0

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David Fletcher
David Fletcher 2021 年 5 月 22 日
編集済み: David Fletcher 2021 年 5 月 22 日
May not be the best answer - I don't do much image manipulation work
%load and display image
imageData=imread('test.jpeg');
subplot(2,1,1)
imshow(imageData);
%Create mask for red colour data >200
redMask=imageData(:,:,1)>200;
%Apply mask to red channel
red=imageData(:,:,1);
red=red.*cast(redMask,'like',imageData);
%Clear colour data from all channels
imageData=imageData*0;
%Replace red channel with the masked data
imageData(:,:,1)=red;
%Show image with red channel mask mask
subplot(2,1,2)
imshow(imageData);
  10 件のコメント
Moe Makki
Moe Makki 2021 年 5 月 23 日
oops my bad there was an error with imshow i replaced it with the same picture
Moe Makki
Moe Makki 2021 年 5 月 23 日
Thanks for your help appreciated.

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その他の回答 (1 件)

Image Analyst
Image Analyst 2021 年 5 月 22 日
Try this:
% Find where red value is more than 200.
mask = rgbImage(:, :, 1) > 200;
% Mask the image using bsxfun() function to multiply the mask by each channel individually.
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask, 'like', rgbImage));
  6 件のコメント
Image Analyst
Image Analyst 2021 年 5 月 24 日
編集済み: Image Analyst 2021 年 5 月 24 日
In the future, please "Tag" the post as homework if it's homework (I've done it for you now). That tells us not to post full working code, that, if you turn in as your own, may get you into trouble for plagiarism. We wouldn't want you to get into trouble.
Moe Makki
Moe Makki 2021 年 5 月 24 日
@Image Analyst will do thanks for your lovely advice .
Have a great day sir.

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