获取图像总价值

Question

下面是我的代码：

private double GetImageValue(Bitmap Image)
{
    double ImageValue = 0;

    for (int X = 0; X < Image.Width; X++)
    {
        for (int Y = 0; Y < Image.Height; Y++)
        {
            Color CurrentPixel = Image.GetPixel(X, Y);

            ImageValue += CurrentPixel.A + CurrentPixel.B + CurrentPixel.G + CurrentPixel.R;
        }
    }
    return ImageValue;
}

代码返回图像中每个像素的总值。有没有办法加快这个过程？

Answer 1

类似这样的：

private double GetImageValue(Bitmap image)
{
double imageValue = 0;

var rect = new Rectangle(0, 0, image.Width, image.Height);
var bmpData = image.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
var ptr = bmpData.Scan0;
var bytes = Math.Abs(bmpData.Stride) * image.Height;
var values = new byte[bytes];

System.Runtime.InteropServices.Marshal.Copy(ptr, values, 0, bytes);

for (int y = 0; y < image.Height; y++)
{
    int lineStart = y * Math.Abs(bmpData.Stride);
    for (int x = 0; x < image.Width * 3; x++)
    {
        imageValue += values[lineStart + x];
    }
}
image.UnlockBits(bmpData);
return imageValue;
}