Hot answers tagged

4 votes

Detecting bullet holes using Python with camera or sensors

I can't really comment on the machine vision part, other than any question that asks "How do I do <some signal processing task> in <some language>" is fairly naive. The way you ...
user avatar
  • 8,638
4 votes

Which Blur is being used in this effect

So I tried what has been suggested on this image Here's the python code : ...
user avatar
2 votes

Which Blur is being used in this effect

It's not a blur; as you can see in your size=0 example, this has to do something with a cyclic half-image shift of the shape and something like XOR-ing the pattern with itself. Maybe afterwards a ...
user avatar
2 votes

What happens when you read and save the same JPEG image again over and over?

The first application of JPEG to a BMP image is the stage at which data compression (and data loss) happens, amount of which is indicated by the quality parameter and input image statistics (or ...
user avatar
  • 26.8k
2 votes

What happens when you read and save the same JPEG image again over and over?

JPEG is lossy compression, and it is allowed to do anything deemed beneficial in representing an image as accurately as possible using the minimum amount of storage while keeping cpu load in check. ...
user avatar
  • 2,274
2 votes

What Is the Difference between Difference of Gaussian, Laplace of Gaussian, and Mexican Hat Wavelet?

Let's see how DoG approximates LoG for the 2D case (for an image, e.g.). By derivative theorem of convolution (by associativity and commutativity), $$\nabla^2[f(x, y) \ast G(x, y)] = \nabla^2 G(x, y) \...
user avatar
1 vote

Problem with "Topological Structural Analysis of Digitized Binary Images by Border Following" by Suzuki Abe

Your output has a mistake, since it's giving -2 to left pixels. Let's add some coordinates to your image: You start in raster scan order and hit step (1)(a): it's ...
user avatar
1 vote
Accepted

bilateral filter for color images

It seems to work for me. If I give it the input image on the left and use parameters sigmaspatial of 20 and sigmarange of 200, I ...
user avatar
  • 22.9k
1 vote

Calibration using Camera Calibration Toolbox for Matlab vs OpenCV

Depending on the lens-distortion model used, the achievable accuracy can be significantly different: https://discorpy.readthedocs.io/en/latest/tutorials/methods.html Have a go with another approach ...
user avatar
1 vote

What impact have different types of border-handling on high pass or low pass filtering?

I guess it depends on the kind of filter and the use/expectations of its output. For a lowpass filter where you want to look at a smoothed waveform, perhaps replicating the first sample is a good ...
user avatar
  • 2,274

Only top scored, non community-wiki answers of a minimum length are eligible