有效地获取图像的所有像素信息 [英] Get all pixel information of an image efficiently

问题描述

我制作了一个程序来从图片中获取所有图像像素RGB颜色代码。基本上，它将y位置设置为常数，并通过循环将x位置的宽度从零更改为y。

I made a program to get all image pixel RGB color codes from picture. Basically, it sets y position on constant and changes x position zero to width and also y by looping.

可以，但是问题是要花20多个分钟才能从偶数（1000 * 604高度宽度）的图像中获取所有像素。请有人帮忙吗？

Ok it's work, but the problem is it take more than 20 minutes to get all pixel from even (1000*604 height width) image. Please anyone help?

如果这个过程花了这么长时间，我感到很惊讶，那么我们如何才能从图像制作类似条形码阅读器的程序。我想从图像中获取所有像素值，这是下面的C＃代码。

I'm surprised if this process takes so long, then how can we make a program like bar-code reader from image. I want to get all pixel value from image, here is my C# code are below.

我还上传了程序此处，如果您不同意，请进行检查。

I also uploaded my program here, check it if you don't agree.

    void myimage() {

        mypic = new Bitmap(pathname);
        int imwid = mypic.Width;
        int imhei = mypic.Height;
        int total=imwid*imhei;

        for (int z = 0; z <imhei;z++ )
        {
            for (int i = 0; i < imwid; i++)
            {
                Color pixelColor = mypic.GetPixel(i, z);

                textBox2.AppendText("  " + pixelColor.R + 
                    "     " + pixelColor.G + 
                    "     " + pixelColor.B + "     " + 
                    pixelColor.A + 
                    Environment.NewLine);
            }
        }
    }

推荐答案

看看这个：

var data = mypic.LockBits(
    new Rectangle(Point.Empty, mypic.Size),
    ImageLockMode.ReadWrite, mypic.PixelFormat);
var pixelSize = data.PixelFormat == PixelFormat.Format32bppArgb ? 4 : 3; // only works with 32 or 24 pixel-size bitmap!
var padding = data.Stride - (data.Width * pixelSize);
var bytes = new byte[data.Height * data.Stride];

// copy the bytes from bitmap to array
Marshal.Copy(data.Scan0, bytes, 0, bytes.Length);

var index = 0;
var builder = new StringBuilder();

for (var y = 0; y < data.Height; y++)
{
    for (var x = 0; x < data.Width; x++)
    {
        Color pixelColor = Color.FromArgb(
            pixelSize == 3 ? 255 : bytes[index + 3], // A component if present
            bytes[index + 2], // R component
            bytes[index + 1], // G component
            bytes[index]      // B component
            );

        builder
            .Append("  ")
            .Append(pixelColor.R)
            .Append("     ")
            .Append(pixelColor.G)
            .Append("     ")
            .Append(pixelColor.B)
            .Append("     ")
            .Append(pixelColor.A)
            .AppendLine();

        index += pixelSize;
    }

    index += padding;
}

// copy back the bytes from array to the bitmap
Marshal.Copy(bytes, 0, data.Scan0, bytes.Length);

textBox2.Text = builder.ToString();

仅是示例，请阅读有关 LockBits 和一般成像以清楚地了解会发生什么。

Is just an example, read some good tutorials about LockBits and imaging in general to understand clearly what happens.

这篇关于有效地获取图像的所有像素信息的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！