MATLAB: How to draw different color on single image in GUI

image processingImage Processing Toolboximage segmentation

i want to draw two different color freehand mask on image which is displayed in GUI axes

Best Answer

I don't think the drawing color is an option to imfreehand(). So after you've completed drawing it, you'll have to use plot() to place the outline into the overlay with the color you want.

With the newer drawfreehand() function, there is an input option to specify the color.

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MATLAB: Create Lab coordinates and save them in MAT file .

Not sure what you're asking, but I think you might want to follow these steps

read in and display image
call drawfreehand()
convert your image to lab with rgb2lab()
separate your lab image to 3 separate monochrome images: lImage, aImage, bImage
use the mask from drawfreehand() to get the means

meanL = lImage(mask);
meanA = aImage(mask);
meanB = bImage(mask);

MATLAB: How to fill color in the specified area

You can use imfill() if you have a binary image, or if the binary image is a mask, then for a black and white image, you can do

grayImage(binaryImage) = fillColor;  % Whatever this might be, say 42 or 123.

If you have a color image, you can do

% Mask the image.
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask,class(rgbImage)));

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MATLAB: How to fill color in the specified area

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MATLAB: Create Lab coordinates and save them in MAT file .