c - CS50x - 过滤器更多

问题描述

我在c中对图像bmp进行过滤。pset 需要 Sobel 运算符。我不知道我错在哪里。

请帮帮我。

我基本上是在复制我的图像（因为原件会被更改。）

然后我将 3x3 值放入公式中

所以我们加和乘

最后我把结果代入公式：平方根 (Gx ^ 2 + Gy ^ 2)

如果超过 255 则必须为 255，因为 RGB 上升到 255 即为白色

如果有残缺的数字，则四舍五入到最接近的数字

// Detect edges
void edges(int height, int width, RGBTRIPLE image[height][width])
{
    // Variáveis
    RGBTRIPLE temp[height][width];
    int GR[3][3];
    int GG[3][3];
    int GB[3][3];
    int Gx[3][3] = {{-1, 0, 1}, {-2, 0, 2}, {-1, 0, 1}};
    int Gy[3][3] = {{-1, -2, -1}, {0, 0, 0}, {1, 2, 1}};
    float resultR, resultG, resultB;

    // Cópia temporária do original
    for (int tempi = 0; tempi < height; tempi++)
    {
        for (int tempj = 0; tempj < width; tempj++)
        {
            temp[tempi][tempj].rgbtRed = image[tempi][tempj].rgbtRed;
            temp[tempi][tempj].rgbtGreen = image[tempi][tempj].rgbtGreen;
            temp[tempi][tempj].rgbtBlue = image[tempi][tempj].rgbtBlue;
        }
    }


    for (int i = 0; i < height; i++)
    {
        for (int j = 0; j < width; j++)
        {

            int countx = 0;

            // Pegar 3X3
            for (int x = i - 1; x < i + 2; x++)
            {
                int county = 0;
                for (int y = j - 1; y < j + 2; y++)
                {
                    if ((x < 0 || y < 0) || (x >= height || y >= width))
                    {
                        GR[countx][county] = 0;
                        GG[countx][county] = 0;
                        GB[countx][county] = 0;
                    }
                    else
                    {
                        GR[countx][county] = temp[x][y].rgbtRed;
                        GG[countx][county] = temp[x][y].rgbtGreen;
                        GB[countx][county] = temp[x][y].rgbtBlue;
                    }

                    county++;

                }
                countx++;
            }

            float sumxR = 0, sumyR = 0, sumxG = 0, sumyG = 0, sumxB = 0, sumyB = 0;
            for (int ix = 0; ix <= 2; ix++)
            {
                for (int iy = 0; iy <= 2; iy++)
                {
                    sumxR = sumxR + (GR[ix][iy] * Gx[ix][iy]);
                    sumxG = sumxG + (GG[ix][iy] * Gx[ix][iy]);
                    sumxB = sumxB + (GB[ix][iy] * Gx[ix][iy]);

                    sumyR = sumyR + (GR[ix][iy] * Gy[ix][iy]);
                    sumyG = sumyG + (GG[ix][iy] * Gy[ix][iy]);
                    sumyB = sumyB + (GB[ix][iy] * Gy[ix][iy]);
                }
            }


            resultR = sqrt(sumxR * sumxR) + sqrt(sumyR * sumyR);
            resultG = sqrt(sumxG * sumxG) + sqrt(sumyG * sumyG);
            resultB = sqrt(sumxB * sumxB) + sqrt(sumyB * sumyB);

            if (resultR > 255)
            {
                resultR = 255;
            }
            if (resultG > 255)
            {
                resultG = 255;
            }
            if (resultB > 255)
            {
                resultB = 255;
            }

            image[i][j].rgbtRed = round(resultR);
            image[i][j].rgbtGreen = round(resultG);
            image[i][j].rgbtBlue = round(resultB);
        }
    }
}

标签： cmemoryfiltercs50edge-detection

c - CS50x - 过滤器更多

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