MATLAB: Image overlay from certain position in the background image

image processingImage Processing Toolboximage segmentation

I have 2 images and I am overlaying object from image B on the image A. I want to overlay at the certain position on image A. From example, I want an object from image B to overlay on Image A at the certain position of image A. Like object should be just above from the bottom.

Best Answer

See instructions on overlaying an image onto another image:

http://blogs.mathworks.com/steve/2009/02/18/image-overlay-using-transparency/

http://www.mathworks.com/matlabcentral/answers/104889-how-to-overlay-a-foreground-image-over-a-background-image

You might have to use imtranslate() if the one image needs to be shifted with respect to the other.

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MATLAB: Overlaying Transparent Image with Clear Background on Original

I was able to fix my problem by using the regionprops and patch functions to find object extrema and plot patch regions semi-transparently on the original image.

http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/

MATLAB: Create image from overlay

One way is just to print the figure window after you have overlayed both images using your code

mshow(screen); %screen is the background image
hold on
OverlayImage = imshow( trmp ); %trmp is the density field
caxis auto  
colormap( OverlayImage.Parent, jet );
colorbar( OverlayImage.Parent );
rslt=set(OverlayImage, 'AlphaData', 0.4 );
print -djpeg filename

This will create a JPG image, will you can read using imread function. However, due to JPEG comression, you might not want this solution.

In that case you can try to use imfuse function: https://www.mathworks.com/help/images/ref/imfuse.html

img_overlay = imfuse(screen, trmp);

Best Answer

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MATLAB: Overlaying Transparent Image with Clear Background on Original

MATLAB: Create image from overlay

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