I made a simple graphical user interface with Qt and I use OpenCV for making processing on webcam streaming, i.e canny edge detection.
I try to implement a switch between two displays of the webcam :
1*) "normal Mode" : a grayscale display where webcam gives a border detection video with grayscale color
2*) "greenMode" : a green and black display where webcam gives the same "border detected" but with green and black colors.
The first one works (with grayscale) works. Here's the result :
Now I have problems with the second one. Here's the part of the code where I can't find a solution :
// Init capture
capture = cvCaptureFromCAM(0);
first_image = cvQueryFrame( capture );
// Init current qimage
current_qimage = QImage(QSize(first_image->width,first_image->height),QImage::Format_RGB32);
IplImage* frame = cvQueryFrame(capture);
int w = frame->width;
int h = frame->height;
if (greenMode) // greenMode : black and green result
{
current_image = cvCreateImage(cvGetSize(frame),8,3);
cvCvtColor(frame,current_image,CV_BGR2RGB);
for(int j = 0; j < h; j++)
{
for(int i = 0; i < w; i++)
{
current_qimage.setPixel(i,j,qRgb(current_image->imageData[i+j*w+1],current_image->imageData[i+j*w+1],current_image->imageData[i+j*w+1]));
}
}
}
else // normal Mode : grayscale result WHICH WORKS
{
current_image = cvCreateImage(cvGetSize(frame),8,1);
cvCvtColor(frame,current_image,CV_BGR2GRAY);
for(int j = 0; j < h; j++)
{
for(int i = 0; i < w; i++)
{
current_qimage.setPixel(i,j,qRgb(current_image->imageData[i+j*w+1],current_image->imageData[i+j*w+1],current_image->imageData[i+j*w+1]));
}
}
}
gaussianfilter(webcam_off);
border_detect(webcam_off);
cvReleaseImage(¤t_image);
repaint();
The "greenMode" doesn't seem to put good pixels with this "setPixel
" (I take the middle rgb value : current_image->imageData[i+j*w+1]
) :
current_image = cvCreateImage(cvGetSize(frame),8,3);
cvCvtColor(frame,current_image,CV_BGR2RGB);
for(int j = 0; j < h; j++)
{
for(int i = 0; i < w; i++)
{
current_qimage.setPixel(i,j,qRgb(current_image->imageData[i+j*w+1],current_image->imageData[i+j*w+1],current_image->imageData[i+j*w+1]));
}
}
Here's what I get :
Firstly, the output is not green and black and secondly, it's zoomed compared to the grayscale image.
Could you have any clues to get the greenMode ?