2 votes
Accepted

Convex Hull Area in Pixels

It is known that OpenCV contours are not useful for quantification. For example this issue was closed without any changes, not even to the documentation. I have also seen multiple questions on Stack ...
Cris Luengo's user avatar
  • 2,494
1 vote

OpenCV 2 Connect Incomplete Contours edges

I will try to sketch a solution. It is easy using a dilation (imdilate() in MATLAB) to close the curves. The issue is will make other elements connected as well. So ...
Royi's user avatar
  • 19.6k
1 vote

Camera sensor artifacts next to edges in calibration images; what is causing these?

The problem might be linked with the camera model. Here, I am using a basler daA2500-14uc with the same image sensor (MT9P031). The edge ringing looks very similar to yours: The ringing occurs only ...
anotherwingover's user avatar
1 vote

Segment Hand Image into Palm and Fingers

You may use a MATLAB function bwgrowregions() which is an open source code. They actually show your case as an example: If you're limited to Python + OpenCV, since ...
Royi's user avatar
  • 19.6k
1 vote

Detecting bullet holes using Python with camera or sensors

A couple of comments from a practical aspect, I can't comment on the electronics side - close grouping of shots will be an issue unless you an automatic paper roller feeder system which "closes ...
Andrew Popplewell's user avatar
1 vote

Primitive Feature Detection to Detect a Black Circle within an Image

I think you can use a much simpler method. The steps I did are: I filtered the image with an Edge Preserving Filter. I looked the profile of values along the 2 diagonals of the image. I think once ...
Royi's user avatar
  • 19.6k
1 vote

Efficient Hessian-Laplace blob detector implementation

You certainly can approximate Gaussian Blur by Box Filter which can be calculated by Integral Image. From that you can do Difference of Gaussian which is an approximation of the Laplacian of Gaussian. ...
Royi's user avatar
  • 19.6k
1 vote

Shape Properties Which Are Scale Rotation Invariant Like HuMoment

The Wikipedia page on image moments is worth reading. It clarifies what moments mean in image processing, and show the difference between moments, central moments, normalized central moments, and Hu ...
Cris Luengo's user avatar
  • 2,494
1 vote

How do I get the most accurate camera calibration?

Please check this article about camera calibration for dash camera of moving car dash camera - it uses optical flow and few tricks with use of least square optimization over optical flow to detect car ...
Dmytro Brazhnyk's user avatar

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