如何以编程方式检测图像的边界? [英] How to detect an image border programmatically?
问题描述
我在寻找其检测图像的边界的程序,
比如我有一个广场和程序检测到X / Y-COORDS
I'm searching for a program which detects the border of a image, for example I have a square and the program detects the X/Y-Coords
例如:
推荐答案
这是一个非常简单的边缘检测。它适用于二值图像。它只是计算像image.pos水平和垂直像素之间的差异[1,1] = image.pos [1,1] - image.pos [1,2],并且在同一垂直差异。记住,你还需要正常化它值0..255的范围内。
This is a very simple edge detector. It is suitable for binary images. It just calculates the differences between horizontal and vertical pixels like image.pos[1,1] = image.pos[1,1] - image.pos[1,2] and the same for vertical differences. Bear in mind that you also need to normalize it in the range of values 0..255.
但是!如果你只需要一个程序,使用Adobe公司的Photoshop。
But! if you just need a program, use Adobe Photoshop.
code C#编写的。
Code written in C#.
public void SimpleEdgeDetection()
{
BitmapData data = Util.SetImageToProcess(image);
if (image.PixelFormat != PixelFormat.Format8bppIndexed)
return;
unsafe
{
byte* ptr1 = (byte *)data.Scan0;
byte* ptr2;
int offset = data.Stride - data.Width;
int height = data.Height - 1;
int px;
for (int y = 0; y < height; y++)
{
ptr2 = (byte*)ptr1 + data.Stride;
for (int x = 0; x < data.Width; x++, ptr1++, ptr2++)
{
px = Math.Abs(ptr1[0] - ptr1[1]) + Math.Abs(ptr1[0] - ptr2[0]);
if (px > Util.MaxGrayLevel) px = Util.MaxGrayLevel;
ptr1[0] = (byte)px;
}
ptr1 += offset;
}
}
image.UnlockBits(data);
}
从的Util类方法
Method from Util Class
static public BitmapData SetImageToProcess(Bitmap image)
{
if (image != null)
return image.LockBits(
new Rectangle(0, 0, image.Width, image.Height),
ImageLockMode.ReadWrite,
image.PixelFormat);
return null;
}
如果您需要更多的解释或算法只是更多信息,请不用如此一般。
If you need more explanation or algorithm just ask with more information without being so general.
这篇关于如何以编程方式检测图像的边界?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!