how to detect only object without background?

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wongsathorn pinwihok
评论： wongsathorn pinwihok 2020-2-2
  2 个评论
Guillaume
Guillaume 2020-2-2
You'll get more chance of getting help if you actually write words to explain what you want.
As it is,we just have a question title with no definition of what's an object (the foot? the white dots?) or what's background (the black bit).
wongsathorn pinwihok
wongsathorn pinwihok 2020-2-2
the object is the foot and the background is the black bits.

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Image Analyst
Image Analyst 2020-2-2
Find out where all color channels are darker than some threshold, then and the masks and take the largest blob
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
% Threshold to create mask for each channel.
threshold = 20; % Whatever...
mask = (redChannel < threshold) & (greenChannel < threshold) & (blueChannel < threshold);
backgroundMask = bwareafilt(mask, 1); % Take largest blob
footMask = ~backgroundMask; % The inverse of the background mask.
  1 个评论
wongsathorn pinwihok
wongsathorn pinwihok 2020-2-2
I = imread('test.jpg');
rotI = imrotate(I,0,'crop');
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
% Threshold to create mask for each channel.
threshold = 20; % Whatever...
mask = (redChannel < threshold) & (greenChannel < threshold) & (blueChannel < threshold);
backgroundMask = bwareafilt(mask, 1); % Take largest blob
footMask = ~backgroundMask; % The inverse of the background mask.
imshow(rotI);
Am I right?

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