USER_123's profile - activity

Could anyone tell me how to derive the Spectral Residual Approach Hit Rate and False Alarm Rate below?

Equation 11 and 12

Besides, what does it mean by four labelers ? I search "four labelers" and this is the only search result. And why does the black region indicates false alarm region ?

For the code segment at https://github.com/Itseez/opencv/blob...

Why take K=patternSize/2 and N = patternSize + K + 1 ?

patternSize = 16 for this case, because we are using FAST-9_16 and there are 16 pixels around the circle of radius 3

I am wondering if https://github.com/Itseez/opencv/blob/master/modules/features2d/src/orb.cpp#L375 is the coding implementation hardcoded result of ORB rBRIEF greedy search ?

If the answer is yes, then why its size is 256 X 4 instead of 256 X 2 since we are taking pairs of two as mentioned in ORB rublee 2011 paper ? Besides, why is N = (31-5)^2 instead of (31-5+1)^2 ?

Thanks !

I have a question on ORB harris corner detection matrix as below

May I know why two of the matrix entries go to ZERO ?

Thanks !

Thanks for the general explanation that I am more aware of the real purpose of the pyramid. Do you have other references talking about how to generate the pyramid mathematically ?

For ORB pyramid, anyone have some references/explanation on the code segment at https://github.com/Itseez/opencv/blob...

I have downloaded books, lecture notes, papers, and articles to read, but I could not understand the maths involved in ORB pyramid. Any ideas ?

Thanks !

Dear all openCV seniors,

I am working on ORB project.

I am trying to solve the function multiple definition issue for ORB source file. https://github.com/Itseez/opencv/blob/master/modules/features2d/src/orb.cpp#L715

I created another new project and test function definition outside the class (No build error).

Then, I put this test class "abcd" and its external function definition into my project with the original ORB source file (Build error comes out as attached with the test class and its function definition)

After that, I switch both project source files to test project settings. (still build error for ORB files, no build error for test files, it means the error goes together with source files, not project setting).

Please advise.