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I need to find differences on the following two images. The first one has very small blobs (please look at the middle of first image) that I would like to detect . I converted images to GRAYSCALE (I also have color images) and I tried

Core.absdiff(imgWithBlobs, imgRef, diff);
Mat threshold = new Mat();
Imgproc.threshold(diff, threshold, 45, 255, Imgproc.THRESH_BINARY);

Then I tried some erotion and dilation, but results are poor. Any suggestion? Maybe I should explore a different colorspace ?

I need to find differences on the following two images. The first one has very small blobs (please look at the middle of first image) that I would like to detect .

Core.absdiff(imgWithBlobs, imgRef, diff);
Mat threshold = new Mat();
Imgproc.threshold(diff, threshold, 45, 255, Imgproc.THRESH_BINARY);

I need to find differences on the following two images. The first one has very small blobs (please look at the middle of first image) that I would like to detect .

I converted images to GRAYSCALE (I also have color images) grayscale

.

and I tried

Core.absdiff(imgWithBlobs, imgRef, diff);
Mat threshold = new Mat();
Imgproc.threshold(diff, threshold, 45, 255, Imgproc.THRESH_BINARY);

Then I tried some erotion and dilation, but results are poor. Any suggestion? Maybe I should explore a different colorspace ?

I need to find differences on the following two images. The first one has very small blobs (please look at the middle of first image) that I would like to detect detect. Also, the first one has been cropped from the second.

I converted images to grayscalegrayscale and added a border to the first, to align them to same size.

.

and I tried

Core.absdiff(imgWithBlobs, imgRef, diff);
Mat threshold = new Mat();
Imgproc.threshold(diff, threshold, 45, 255, Imgproc.THRESH_BINARY);

Then I tried some erotion and dilation, but results are poor. Any suggestion? Maybe I should explore a different colorspace ?