今天因为某件事情，想搞个图片，想防止被OCR。
各种试，但不得不说现在的OCR真的牛啊，变形，加噪，横线，仍然难以阻挡。
后面试了不下百十来种字体，但仍然无效，比如下面的
也试了一种简单办法 ，有点小用，但也没大用
但最后试出一种结果，可以有效的防止OCR（只是目前），拿三家大厂来试一下
腾讯
https://cloud.tencent.com/product/ocr-catalog
百度
https://cloud.baidu.com/product/ocr/general
阿里
https://duguang.aliyun.com/experience?type=universal&subtype=general#intro
这个字体是怎么生成的了，很简单
生成汉字，扭曲，加棱形外框，旋转20度。
不知道哪位民间高手，能够试试？
另外把生成验证码的各种操作C#代码放出来，凑合看，跟本文关系不大
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace wxEncode
{
public partial class Form1 : Form
{
//private static Color BackColor = Color.White;
private static int Width = 62;
private static int Height = 61;
private Random _random;
//private int _brushNameIndex;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string code = "今";
//code = "wwwwsss.coa.domf";
//code = "wwwww.baidu.com";
Width = getstrLen(code);
pictureBox1.Image = GetVCode(code);
Bitmap b= TwistImage(new Bitmap(pictureBox1.Image), true, Convert.ToInt32( numericUpDown1.Value), Convert.ToInt32(numericUpDown2.Value));
Image img = b;
//System.IO.File.Delete(@"d:\x.png");
//b.Save(@"d:\x.png");
pictureBox1.Image = b;
}
public int getstrLen(string code)
{
code = code.Trim();
string d = "`1234567890-=qwertyuiop[]\\asdfghjkl;'zxcvbnm,./~!@#$%^&*()_+QWERTYUIOP{}|ASDFGHJKL:\"ZXCVBNM<>?";
int r = 0;
int e = 0;
int h = 0;
for (int i = 0; i < code.Length; i++)
{
if (d.Contains(code[i]))
{
//r += 15;
e++;
}
else
{
//r += 20;
h++;
}
}
int s1 = 6;
if (e < s1)
r += e * 40;
else
r += e * 28;
if (h < s1)
r += h * 60;
else
r += h * 45;
//if (code.Length<=s1)
// if (e>=2)
// r += (s1+1- e)*10;
return r;
}
public Image GetVCode(string codeStr)
{
_random = new Random();
using (Bitmap img = new Bitmap(Width, Height))
{
// _code = GetRandomCode();
// System.Web.HttpContext.Current.Session["vcode"] = _code;
using (Graphics g = Graphics.FromImage(img))
{
g.Clear(Color.White);//绘画背景颜色
Paint_Text(g, codeStr);// 绘画文字
// g.DrawString(strCode, new Font("微软雅黑", 15), Brushes.Blue, new PointF(5, 2));// 绘画文字
//Paint_TextStain(img);// 绘画噪音点
Paint_line(g);
g.DrawRectangle(Pens.DarkGray, 0, 0, Width - 1, Height - 1);//绘画边框
IntPtr pr = img.GetHbitmap();
Image MyImage = Image.FromHbitmap(pr);
return MyImage;
//using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
//{
// //将图片 保存到内存流中
// img.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
// //将内存流 里的 数据 转成 byte 数组 返回
// return ms.ToArray();
//}
}
}
}
private void Paint_line(Graphics graph)
{
return;
int nLines = 3;
System.Drawing.Pen pen = new System.Drawing.Pen(GetBrush(), 0.5f);
for (int a = 0; a < nLines; a++)
{
int x1 = _random.Next() % Convert.ToInt32 (Width/4);
int y1 = _random.Next() % Height;
int x2 = _random.Next() % Convert.ToInt32(Width / 4*3);
int y2 = _random.Next() % Height;
graph.DrawLine(pen, x1, y1, x2, y2);
}
}
///
/// 绘画文字
///
///
private void Paint_Text(Graphics g, string code)
{
g.DrawString(code, GetFont(), GetBrush(), 3, 1);
}
///
/// 绘画文字噪音点
///
///
private void Paint_TextStain(Bitmap b)
{
string[] BrushName = new string[] { "OliveDrab",
"ForestGreen",
"DarkCyan",
"LightSlateGray",
"RoyalBlue",
"SlateBlue",
"DarkViolet",
"MediumVioletRed",
"IndianRed",
"Firebrick",
"Chocolate",
"Peru",
" enrod"
};
for (int n = 0; n < Width*Height*0.05; n++)
{
int bi = _random.Next(0, BrushName.Length);
int x = _random.Next(Width);
int y = _random.Next(Height);
b.SetPixel(x, y, Color.FromName(BrushName[bi]));
}
}
///
/// 随机取一个字体
///
///
private Font GetFont()
{
string[] FontItems = new string[]{ "Arial",
"Helvetica",
"Geneva",
"sans-serif",
"Verdana"
};
int fontIndex = _random.Next(0, FontItems.Length);
FontStyle fontStyle = GetFontStyle(_random.Next(0, 2));
Console.WriteLine("font:" + FontItems[fontIndex]);
return new Font(FontItems[4], 25, fontStyle);
}
/**/
/**/
/**/
///
/// 随机取一个笔刷
///
///
private Brush GetBrush()
{
Brush[] BrushItems = new Brush[]{ Brushes.OliveDrab,
Brushes.ForestGreen,
Brushes.DarkCyan,
Brushes.LightSlateGray,
Brushes.RoyalBlue,
Brushes.SlateBlue,
Brushes.DarkViolet,
Brushes.MediumVioletRed,
Brushes.IndianRed,
Brushes.Firebrick,
Brushes.Chocolate,
Brushes.Peru,
Brushes.Goldenrod
};
int brushIndex = _random.Next(0, BrushItems.Length);
Console.WriteLine("brush:" + brushIndex.ToString () +"--" + BrushItems[brushIndex]);
return BrushItems[7];
}
///
/// 绘画背景颜色
///
///
private void Paint_Background(Graphics g)
{
g.Clear(Color.White);
}
/**/
/**/
/**/
///
/// 取一个字体的样式
///
///
///
private FontStyle GetFontStyle(int index)
{
index = 0;
switch (index)
{
case 0:
return FontStyle.Bold;
case 1:
return FontStyle.Italic;
default:
return FontStyle.Regular;
}
}
///
/// 取得一个 4 位的随机码
///
///
public string GetRandomCode()
{
return Guid.NewGuid().ToString().Substring(0, 5);
}
private const double PI = 3.1415926535897932384626433832795;
private const double PI2 = 6.283185307179586476925286766559;
///
/// 正弦曲线Wave扭曲图片
///
/// 图片路径
/// 如果扭曲则选择为True
/// 波形的幅度倍数，越大扭曲的程度越高，一般为3
/// 波形的起始相位，取值区间[0-2*PI)
///
public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
{
System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
//将位图背景填充为白色
System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);
graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);
graph.Dispose();
double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;
for (int i = 0; i < destBmp.Width; i++)
{
for (int j = 0; j < destBmp.Height; j++)
{
double dx = 0;
dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
dx += dPhase;
double dy = Math.Sin(dx);
//取得当前点的颜色
int nOldX = 0,nOldY = 0;
nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
nOldY = bXDir ? j : j + (int)(dy * dMultValue);
System.Drawing.Color color = srcBmp.GetPixel(i, j);
if (nOldX >= 0 && nOldX < destBmp.Width
&& nOldY >= 0 && nOldY < destBmp.Height)
{
destBmp.SetPixel(nOldX, nOldY, color);
}
}
}
return destBmp;
}
}
}
View Code