Detecting blob coordinates in a small image

Python
1

Hi guys!

I need to get the blob coordinates on a very small image (which seems to be an issue) shown below. It’s a portion of a processed camera feed.

as of now i am stuck as i cannot detect the mentioned blob, no matter the parameters
the blob detector call and keypoint drawing

keypointsR = det.detect(rROImask)
highlightR = cv2.drawKeypoints(rROImask, keypointsR,np.array([]),(255,0,0), cv2.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS))

Do you have any idea what am i doing wrong?

2

@Pendzel
Detectors analyze the surroundings of each pixel to get a keypoint. They use a sliding window, and won’t work if the window doesn’t fit in the image.

1 Like
3

What you are doing wrong: not telling how small “very small” is, and not showing an example image.

(Note that if the size is the issue, you can always resize the image…)

4

can you explain, why you can’t use the whole image ?

5

I believe the image @Pendzel provided is the example:
image

@Pendzel , can you tell us the image size, and show more detailed code, like what detector are you using?

6

i cant use it due to performance issues, Let’s say that’s not the only process running. Alejandro is right it wont work i solved it with detecting the edges instead of a blob.
Case is closed, Tahnks Guys.

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