extract image from segmentation and overlay it

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prashant singh 2017-7-7

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https://ww2.mathworks.cn/matlabcentral/answers/347754-extract-image-from-segmentation-and-overlay-it

评论： Image Analyst 2024-2-19

i have to extract the person from the image(mask_crop.png) and overlay it to the other pgm(sample.zip) image. i have already tried thresholding based extraction and intensity based overlay. The results were not that good. Please find the two images attached.

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Answer 1

Image Analyst 2017-7-7

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https://ww2.mathworks.cn/matlabcentral/answers/347754-extract-image-from-segmentation-and-overlay-it#answer_273255

See blogs on overlays:

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

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Aisha 2017-10-6

编辑：Image Analyst 2017-10-6

I have the same issue. Here is the sample image, which we want as result:

I have a binary prediction map, which I want to overlay on original image with transparency to see how good the segmentation results are. I have looked into alpha property and also tried imoverlay function. The alpha property method does not work, and imoverlay() overlay maps the binary image as a solid color, thus hiding the original image at pixels positions where the binary map is 1.

Image Analyst 2017-10-6

Please post your binary image and your original RGB image, preferably as a new question with you as the original poster. The alpha method should work. Not sure what you did but if you post your images, we'll get it working.

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Answer 2

Sanjana 2024-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/347754-extract-image-from-segmentation-and-overlay-it#answer_1406536

编辑：Walter Roberson 2024-2-19

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Hi I have totally opposite doubt, Actually Im working with this code which overlays the sematic segmented image over the original image. But i want to extract only the sematic image. How can i do so?

C = semanticseg(I,net);
cmap = camvidColorMap;
B = labeloverlay(I,C,'Colormap',cmap,'Transparency',0.4);
figure
imshow(B)
pixelLabelColorbar(cmap, classes);