# Tagged Questions

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94 views

### Subsampling property of wavelet transform

One of the properties I have seen for isotropic tight wavelet frames is $$\sum_{i\in\mathbb{Z}} \left|h(2^i\omega)\right|^2 = 1$$ where $h(\omega)$ is the frequency spectrum of the original wavelet. ...
23 views

### 2D Procrustes transformation

I have 2 sets of point that belong to 2 different images. These points are defined as: $(x_i, y_i)_{_i=1,...,N}$ and $(x_i', y_i')_{_i=1,...,N}$ All these points are located on their corresponding ...
67 views

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

I've shot a series of photographs in a sort of stop-motion fashion, and although the camera was mounted on a tripod, there are tiny motions between each two successive photos. After some ...
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### How to derive distance on flat floor to object in single camera image

With reference to the comment by @ Andrey Rubshtein in Is it always necessary to use two cameras to find the distance between camera and object? Another way is when you are located on a flat plane,...
32 views

### Why is this projection wrong?

I am trying to figure out why a 3D cube doesn't project in the right place in the image. I start with the camera at origin and the cube centered at (0,0,1) world ...
20 views

### selection criteria for different projections

I need to know the percentage of height of human body parts, I have the following information that I used: my issue in selecting human which was not appeared straightforward (upright) with ...
231 views

### How to generate realistic echo to sounds?

I guess the most straightforward way of adding an artificial echo to a sound signal is to add its time-delayed version to the original signal. However, I am not sure how realistic that would sound ...
2k views

### Ground plane estimation from a single image (was: confusion about homography and calibration camera parameters)

I'm new to this multiple view geometry issues and I'm a little bit lost, and some concept are not clear at all. I have a calibrated camera ( = I have distortion coefficents, field of view, and with ...
190 views

### Ideal geometric arrangement of microphone array

I'm going to have to give a bit of context for this question to make sense. I am working on a project which includes audio source localisation in 3-D space through TDoA (Time Difference of Arrival - ...
43 views

### Intuition of Location on the Conic Axis TDOA solution

In an old paper "A New Approach to Geometry of Range Difference Location", there is a mathematical derivation that does not include any mention of the relationship to the underlying problem. In the ...
2k views

### Automatic Cropping of Arbitrary Shapes

I have an arbitrary shape defined by a binary mask (gray = shape, black = background). I would like to find a largest possible rectangle containing only gray pixels (such rectangle is pictured in ...