# Questions tagged [corners]

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### Given the 4 corners of two QR codes on a photographed sheet of paper, can we get a deskewed rectangular image?

I made a photo of 2 sheets of paper with a phone camera, each of them cropped at the: (x1, y1) top left corner of top QR code (x2, y2) bottom right corner of bottom QR code I hoped that the x, y ...
594 views

### Detect grid corner

I have a picture (B&W) of a curve which is plotted on a gridded paper. What I would like to do is to find the points which are corners of the grid. I apply Harris corner detection algorithm to ...
87 views

### Moravec, Harris noisy window

Harris and Stephens writes about the interest window of Moravec: "The response is noisy because the window is binary and rectangular", and suggests applying a Gaussian window. My Question: Why is the ...
2k views

### How to understand relationships between ellipse and second moment matrix of Harris corner detector?

guys. I am really lacking in knowledge of linear algebra. I am reading slides of Harris corner. But I am really confused about one of them. I know that I can find corners by two large eigenvalues but ...
440 views

### Harris Corner Detection

In Harris Corner detection, is there any particular reason why this function is chosen: $R=det(M)-k*trace(M)^2$ We want to a function to evaluate how fast E(u,v) fluctuate accross different ...
180 views

### Keypoint detection with color images

Are there any known methods to use existing keypoint detectors (which generally work on grayscale images) on color images? of course, one could always add the results of the detector on all three ...
717 views

### Keypoint orientation with the oFAST from Rublee's ORB

I've just read the papers from Rublee et al. (ORB: an efﬁcient alternative to SIFT or SURF) and Rosten et al. (Machine learning for high-speed corner detection) (=fast-detector). Rublee tries to ...