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How to detect a book!

I tried to use SIFT and SURF methods to detect an object (a book in a bookshelf, , scaled / maybe rotated but facing the camera) while having the original image (book cover , fixed and straight image)...

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Coordinates in "reprojectImageTo3D"

Hi. I want to ask about the result coordinates of the function, especially about the Z-coordinate. Is it a coordinate in the world coordinate system (like the objectPoints the function gets), or is it...

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opencv3 videoCapture doesn't work

I've a problem with openCV 3 java wrapper. When i use videocapture, camera.grab() always return false. I see several subjects on internet about this problem. I succeeded to run opencv 2.4 but not with...

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aligment plate or RotatedRect and draw

Hi, i find car plate with opencv and the plate is in the vector this is not alignment (0 degree), how can i rotate "rotatdrect" vector concurrent with original plate . ![image...

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Cars Traffic -please someone help me

please someone help me Hello everyone, I am trying to create a program in C ++ and OpenCV. I need to create a program of car traffic, ie, which accounted me the number of cars passing on the street,...

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Videocapture not work in Opencv 3.0.0 for android

Hello everyone, I am really a freshman in this area. I try to use the Videocapture Class in Opencv 3.0.0., but it doesn't work. The following is my code. ![image...

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Opencv Haar trainig Error

Hi, I'm new of Opencv and i make a road signal detection and i wanna trainig the algorithm for detect this. I have follow this guide on youtube https://www.youtube.com/watch?v=KFC6jxBKtBQ but in the...

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get camera matrix from known camera parameters

I need a camera matrix (fx, fy, cx, cy) for calling `cv::projectPoints`. My camera cannot be calibrated, but I got the parameters of the camera: focal distance: 1.8 focal length: 4.8 aperture: 4.0...

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Latency with mjpg

Hi, I want to calibrate my Ip cam using calibration sample but I have got some latency 1 s when I run program and when I start calibration sometime 10s (ten seconds!). I have write this small program...

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Extern modules OpenCV in c#

How to use extern modules from OpenCV in c#. I want to use c#, but I don't know how to implement the extern modules. I tried to rebuild emgu, but no function call directed to a function from the extern...

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