My webcam doesn't work with OpenCV 2.4.6. I have v4l,v4l2, and it works with Cheese. Any idea what could be wrong?

You mean the intensity of the pixels? I am working on a grayscale image.

Hi I have an image, I want to do feature matching in only some part of the image. Is there any way to extract that non recatngular part, provided the coordinates, and do the processing on it?

Hi,

I was trying to find out the camera matrix and distortion coefficients using cvCalibrateCamera2. There were no compilation errors, but when I am trying to execute the program it gives :

OpenCV error: Sizes of input arguments do not match( both matrices must have the same number of points) in cvConvertPointsHomogenous, file /build/buildd/opencv-2.3.1/modules/calib3d/src/fundam.cpp

size of the matrix storing object points in 4 x 3 and that of the matrix storing image points in 4 X2 , what could be wrong?

Hi, I would like to know if it is possible to know the camera calibration matrix anyhow , just by knowing it's specifications , without using camera calibration???

Tried that too :( It says " Cannot open include file: 'opencv\build\include\opencv2\highgui.h': No such file or directory BUILD FAILED " Any idea what can be wrong??

Thanks for replying :) I tried that out but I am still getting the same error. Moreover these header files reside in opencv\build\include\opencv2\highgui\highgui.hpp and opencv\include\opencv\cv and opencv\build\include\opencv\cxcore , should I write the complete address with include??? :/

This is the first time I am working with opencv in Visual Studio. I have worked in ubuntu though. I was trying to install opencv. 1.I extracted it. Edited the path variable in system properties as D:\opencv\build\x64\vc10\bin 2. I set VCC++ directories as $(OPENCV_BUILD)\x64\vc10\lib;$(LibraryPath). 3.C/C++ additional include directories as $(OPENCV_BUILD)\include\opencv;$(OPENCV_BUILD)\include\opencv2 4. Linker-> input additional dependencies as opencv_core243.lib opencv_imgproc243.lib opencv_highgui243.lib opencv_ml243.lib opencv_video243.lib opencv_features2d243.lib opencv_calib3d243.lib opencv_objdetect243.lib opencv_contrib243.lib opencv_legacy243.lib opencv_flann243.lib

I am using the following sample code: // OpenCVTest.cpp : Defines the entry point for the console application.

include "stdafx.h"

include <opencv\highgui.h>

include <opencv\cv.h>

include <opencv\cxcore.h>

int _tmain(int argc, _TCHAR* argv[]) { IplImage *img = cvLoadImage("C:\Users\firstMap"); cvNamedWindow("OpenCV",1); cvShowImage("OpenCV",img);

cvWaitKey(0);
cvDestroyWindow("OpenCV ");
cvReleaseImage(&img);

return 0;

} I am getting the following error :: fatal error C1083: Cannot open include file: 'opencv\highgui.h': No such file or directory Please help me, I am stuck :-(