changing the pixel color in an image
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Busy Bee
am 17 Jan. 2018
Beantwortet: Image Analyst
am 18 Jan. 2018
I have a raster image and I have the coordinates of the shown point. I need to change the colour of the area occupied by the image(i.e. the black pixels) in the two perpendiculars drawn from the same point(along x and y-axis). Is there any function that I can use?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/169032/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/169034/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/169035/image.png)
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Jan
am 17 Jan. 2018
I do not understand the question. What is "the coloured area"? Do you mean the black pixels which are under the green bars? Or inside the rectangle built by the green bars?
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Image Analyst
am 18 Jan. 2018
Convert your calibrated x,y into rows and columns, then make two masks and AND them together and use sum() to count pixels
yellowMask = rectangleMask & ~blackPolygonMask;
numYellowPixels = sum(yellowMask(:))
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