# Tag Info

Accepted

### Would it be possible to reconstruct 3d trajectory of ball projectile using only monocular video

I guess this is what Olli implies: Using a lens distortion matrix if necessary, the center of the ball in the picture gives you an elevation and azimuth of your ball relative to the focal point of ...
• 30.7k
Accepted

### Derivation of range migration algorithm

So if you continue the substitution you get: $R_t = \sqrt{((-R_BK_X/\sqrt{(K_R^2 - K_X^2)} + X_t - X_t)^2 + R_B^2)}$ $R_t = \sqrt{((-R_BK_X/\sqrt{(K_R^2 - K_X^2)} )^2 + R_B^2)}$ \$R_t = \sqrt{(R_B^...
• 296
1 vote
Accepted

### Understanding difference in rotation and translation

Homography has an interpretation as a change of perspective or movement of the "camera". I think your example casually refers to the apparent "rotation" of the camera in the ...
• 171
1 vote
Accepted

### Computer Vision - Does implementation of Hough Transform for lines require a loop for angle parameter?

In real world implementations, is the line: for theta = [theta_min to theta_max ] required? . . . Since we apply Canny edge detector to an image, prior to Hough Transform, we can obtain angle of ...
• 10.7k
1 vote

### Are there analogues to orthogonal transformations in non-orientable surfaces?

Bear with me, as this is really only tangential¹ to my area of expertise, but: Maybe the question is not how to extend wavelets to work on non-orientable surfaces, but to interpret said surface as ...
• 30.7k
1 vote

### How to triangulate 2 sources on a 2d plane formed by 4 sensors?

Conceptual partial answer: You can use 3 mics to find position in 3D space, except you can't tell if it's above the plane or below the plane (unless you already know there's nothing above the plane, ...
• 15.8k
1 vote
Accepted

### Subsampling property of wavelet transform

I am not completely confident with the full theory of wavelet frames, however I will share some pointers and my beliefs, do not take any of the following for a truth. The property you show is (partly)...
• 31.9k
1 vote
Accepted

### Algorithm to effectively find perspective transform in motion estimation

Assumptions From your question, I assume you already have an algorithm that does produce the transformation you want, but you have to play with the parameters manually. Proposed solution First, ...
• 1,736
1 vote

### 3D point cloud to 2.5D graycale image (metric) [Halcon?]

Your 3 channels already give you the 3D coordinates, and from that 3 images, you already know which pixels locations the 3D data are projected. So you don't need to do anything. If you like to get a ...
• 5,465

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