I have a problem with the cvGet2D in opencv. I captured video from webcam, and it work. There is a code part, and i see the video in the opencv window, but the s Scalar always get 0 value. But there is an image in the "gray" iplimage. What i missed in the code?

.... IplImage *frame; IplImage gray; CvCapture capture = cvCaptureFromCAM(2); CvScalar s;

.....

frame = cvQueryFrame( capture ); gray = cvCreateImage( cvGetSize(frame), IPL_DEPTH_8U,1 );
cvCvtColor(frame, gray, CV_RGB2GRAY); s=cvGet2D(frame,100,100); .... cvShowImage( "Cam", gray );

Please help me somebody! Thank you!

i used it in the code, just writed wrong here:

s=cvGet2D(grey,100,100);

so problem is the same.