Convolution filter

[toutarrive]

Hello,

I need to implement an edge dectection filter on an image.

i've managed to put all the Qrgb colors of the image in a table (matrice_pixel[height] [width] ).

My filter is kernel[3][3] .

But i can't get it work properly when i mutiply the two tables.

Any idea?

QRgb **matrice_pixel = new QRgb*[height];
    for (int i = 0; i <height; i++){
        matrice_pixel[i] = new QRgb[width];
	}
 
	/// Getting the colors
    for ( int i=0; i<height; i++ ) { 
            uchar *p = source.scanLine(i);
            for (int j = 0; j< width;j ++) {
                int blue = int(*p++);
                int green = int(*p++);
                int red = int(*p++);
                int alpha = int(*p++);
                QRgb rgbValue = qRgba(red,green,blue, alpha);
                matrice_pixel[i][j] = rgbValue;
		}	
 
for (int x = 1; x<width ;++x) 
{
for (int y= 1; y< height; ++y)
{
	int red = 0, green = 0, blue = 0;
	//multiply every value of the filter with corresponding image pixel
	for(int kernelX = 0; kernelX < kernelWidth; kernelX++)
	{
		for(int kernelY = 0; kernelY < kernelHeight; kernelY++){
 
		  red += qRed(matrice_pixel[x][ y] ) * kernel[kernelX][kernelY];
		  green += qGreen(matrice_pixel[x][y]) * kernel[kernelX][kernelY];
		  blue += qBlue(matrice_pixel[x] [ y]) * kernel[kernelX][kernelY];	
                }
		//truncate values smaller than zero and larger than 255
		red = qMin(qMax(int(factor * red + bias), 0), 255);
		green= qMin(qMax(int(factor * green + bias), 0), 255);
		blue= qMin(qMax(int(factor * blue + bias), 0), 255);
		QRgb rgbValue = qRgb(red,green,blue);
		img.setPixel(x,y, rgbValue);
 
	}
     }
}

QRgb **matrice_pixel = new QRgb*[height];
    for (int i = 0; i <height; i++){
        matrice_pixel[i] = new QRgb[width];
	}

	/// Getting the colors
    for ( int i=0; i<height; i++ ) { 
            uchar *p = source.scanLine(i);
            for (int j = 0; j< width;j ++) {
                int blue = int(*p++);
                int green = int(*p++);
                int red = int(*p++);
                int alpha = int(*p++);
                QRgb rgbValue = qRgba(red,green,blue, alpha);
                matrice_pixel[i][j] = rgbValue;
		}	

for (int x = 1; x<width ;++x) 
{
for (int y= 1; y< height; ++y)
{
	int red = 0, green = 0, blue = 0;
	//multiply every value of the filter with corresponding image pixel
	for(int kernelX = 0; kernelX < kernelWidth; kernelX++)
	{
		for(int kernelY = 0; kernelY < kernelHeight; kernelY++){
					
		  red += qRed(matrice_pixel[x][ y] ) * kernel[kernelX][kernelY];
		  green += qGreen(matrice_pixel[x][y]) * kernel[kernelX][kernelY];
		  blue += qBlue(matrice_pixel[x] [ y]) * kernel[kernelX][kernelY];	
                }
		//truncate values smaller than zero and larger than 255
		red = qMin(qMax(int(factor * red + bias), 0), 255);
		green= qMin(qMax(int(factor * green + bias), 0), 255);
		blue= qMin(qMax(int(factor * blue + bias), 0), 255);
		QRgb rgbValue = qRgb(red,green,blue);
		img.setPixel(x,y, rgbValue);
			
	}
     }
}

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