Beispiel #1
0
        private void YCbCrToRGB()
        {
            progressLabel.Text    = "Converting ycbcr to rgb...";
            progressLabel.Visible = true;
            progressBar.Value     = 0;
            progressBar.Visible   = true;
            // needed to update UI
            this.Update();

            for (int i = 0; i < tempImages.Length; i++)
            {
                Bitmap bitmap = new Bitmap(tempImages[i].width, tempImages[i].height);
                for (int x = 0; x < tempImages[i].width; x++)
                {
                    for (int y = 0; y < tempImages[i].height; y++)
                    {
                        // Color conversion values from
                        // https://www.renesas.com/eu/en/www/doc/application-note/an9717.pdf
                        YCbCrPixel pixel = tempImages[i].GetPixel(x, y);
                        int        r     = (int)(1.164 * (pixel.getY() - 16) + 1.596 * (pixel.getCr() - 128));
                        int        g     = (int)(1.164 * (pixel.getY() - 16) - 0.813 * (pixel.getCr() - 128) - 0.392 * (pixel.getCb() - 128));
                        int        b     = (int)(1.164 * (pixel.getY() - 16) + 2.017 * (pixel.getCb() - 128));
                        // safety mechanism
                        getValidRGBValue(r, out r);
                        getValidRGBValue(g, out g);
                        getValidRGBValue(b, out b);
                        Color color = Color.FromArgb(r, g, b);
                        bitmap.SetPixel(x, y, color);
                    }
                }
                outputImages[i]   = bitmap;
                progressBar.Value = i;

                if (i % keyFrameEvery == 0)
                {
                    GC.Collect();
                }
            }

            progressLabel.Visible = false;
            progressBar.Visible   = false;
            // needed to update UI
            this.Update();
        }
Beispiel #2
0
        //create a matrix containing only Y, Cb or Cr values
        public double[,] FillValueMatrix(YCbCrImage image, String channelString)
        {
            double[,] valueMatrix = null;

            // only save every Nth pixel depending on subsampling mode / channel string
            if (subsamplingMode == "4:4:4" || channelString == "Y")
            {
                valueMatrix = new double[image.width, image.height];
                for (int height = 0; height < image.height; height++)
                {
                    for (int width = 0; width < image.width; width++)
                    {
                        YCbCrPixel pixel = image.GetPixel(width, height);
                        switch (channelString)
                        {
                        case "Y":
                            valueMatrix[width, height] = pixel.getY();
                            break;

                        case "Cb":
                            valueMatrix[width, height] = pixel.getCb();
                            break;

                        case "Cr":
                            valueMatrix[width, height] = pixel.getCr();
                            break;

                        default:
                            break;
                        }
                    }
                }
            }
            else if (subsamplingMode == "4:2:2")
            {
                valueMatrix = new double[image.width / 2, image.height];
                for (int height = 0; height < image.height; height++)
                {
                    for (int width = 0; width < image.width; width += 2)
                    {
                        YCbCrPixel pixel = image.GetPixel(width, height);
                        switch (channelString)
                        {
                        case "Cb":
                            valueMatrix[width / 2, height] = pixel.getCb();
                            break;

                        case "Cr":
                            valueMatrix[width / 2, height] = pixel.getCr();
                            break;

                        default:
                            break;
                        }
                    }
                }
            }
            else if (subsamplingMode == "4:2:0")
            {
                valueMatrix = new double[image.width / 2, image.height / 2];
                for (int height = 0; height < image.height; height += 2)
                {
                    for (int width = 0; width < image.width; width += 2)
                    {
                        YCbCrPixel pixel = image.GetPixel(width, height);
                        switch (channelString)
                        {
                        case "Cb":
                            valueMatrix[width / 2, height / 2] = pixel.getCb();
                            break;

                        case "Cr":
                            valueMatrix[width / 2, height / 2] = pixel.getCr();
                            break;

                        default:
                            break;
                        }
                    }
                }
            }

            return(valueMatrix);
        }