color segmentation/substraction of green screen from image

Question

Sharif 2012-7-31

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https://ww2.mathworks.cn/matlabcentral/answers/44940-color-segmentation-substraction-of-green-screen-from-image

评论： Image Analyst 2015-4-20

Hi i have taken photos of rocks using a green screen as a background. please see:- <http://www.flickr.com/photos/24335673@N04/7683980794/in/photostream/>>

i would like subtract the green bg as effectively as possible so that the boundary of the rock is preserved. would color segmentation be a good method? if so how can i achieve it? or perhaps a different seg method? thank sharif

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Answer 1

Image Analyst 2012-7-31

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/44940-color-segmentation-substraction-of-green-screen-from-image#answer_55055

编辑：Image Analyst 2012-7-31

在 MATLAB Online 中打开

Get the separate color channels:

% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);

Then look where the blue and red channels are dark and the green channel is high.

mask = (redChannel < 50) & (blueChannel < 50) & (greenChannel > 50);
% Mask the image.
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask,class(rgbImage)));

You copyrighted the image to prevent download, so that's about all I can do.