Leptonica
Leptonica is a pedagogically-oriented open source site containing software that is broadly useful for image processing and image analysis applications.
http://www.leptonica.com/
Featured operations are
- Rasterop (a.k.a. bitblt)
- Affine transformations (scaling, translation, rotation, shear) on images of arbitrary pixel depth
- Binary and grayscale morphology, rank order, and convolution
- Seedfill and connected components
- Image transformations combining changes in scale and pixel depth
- Pixelwise masking, blending, enhancement, arithmetic ops, etc.
Ancillary operations include
- I/O for standard image formats
- Utilities to handle arrays of image-related data types
- Utilities for generic stacks, queues, heaps and lists; and for byte queues and arrays of numbers and strings
Example applications include
- Octcube-based color quantization, with and without dithering
- Modified median-cut color quantization, with and without dithering
- Skew determination of text images
- Segmentation of page images with mixed text and images
- jbig2 unsupervised classifier
- Border representations of 1 bit/pixel images and raster conversion for SVG
- PostScript generation (levels 1, 2, 3) of images for device-independent output
- PDF generation (levels 1, 2) of images for device-independent output
- Dewarping images of text taken with a camera
- Rendering text on an image
- Connectivity-preserving thinning and thickening of 1 bit/pixel images
- Line removal from a grayscale sketch
- Search for least-cost paths on binary and grayscale images
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最近做个图像识别的东西，需要将图片中的文字识别出来。
使用tesseract ORC，又发现tesseract ORC依赖leptonica，于是，干脆把leptonica也弄弄好了。
http://www.leptonica.com/
可以下载:
leptonica-1.68.tar.gz //源码 linux
vs2008-1.68.zip ///源码 Windows vs2008
leptonica-1.68-win32-lib-include-dirs.zip //头文件和lib
安装gnuplot
环境变量PATH加入 C:\gnuplot\bin(安装路径\bin,可能也是binary)
创建新环境变量GDFONTPATH 值为C:\WINDOWS\Fonts
创建新环境变量GNUPLOT_FONTPATH值为C:\WINDOWS\Fonts
安装IrfanView
环境变量PATH加入C:\Program Files\IrfanView (安装路径)
解压 leptonica-1.68-win32-lib-include-dirs.zip //头文件和lib
环境变量PATH加入D:\share\leptonica-1.68\lib (解压路径)， 这里如果不加的话，需要将dll放到你的工程目录下。因为运行过程中需要调用liblept168.dll这个动态链接库。否刚的话，肯定会报这个“liblept168.dll找不到”的。
xxx..vcproj 同一个目录
新建一个工程，设置Include files路径和lib库路径
即你解压后的Include
导入lib库
建立link到leptonica的新的空工程,工程配置里linker->input里加入leptonica的lib
link动态库的release版:leptonlib168.dll
ink动态库的debug版:leptonlib168d.dll(168是版本号)
link静态库的release版:
giflib$(GIFLIB_VERSION)-static-mtdll.lib
libjpeg$(LIBJPEG_VERSION)-static-mtdll.lib
libpng$(LIBPNG_VERSION)-static-mtdll.lib
libtiff$(LIBTIFF_VERSION)-static-mtdll.lib
zlib$(ZLIB_VERSION)-static-mtdll.lib
liblept$(LIBLEPT_VERSION)-static-mtdll.lib
link静态库的debug版:
......
如果你找不到GIFLIB_VERSION 类似这些变量的话，写死也行的。就是解压的那些库
giflib416-static-mtdll.lib
giflib416-static-mtdll-debug.lib
libjpeg8c-static-mtdll.lib
libjpeg8c-static-mtdll-debug.lib
libpng143-static-mtdll.lib
libpng143-static-mtdll-debug.lib
libtiff394-static-mtdll.lib
libtiff394-static-mtdll-debug.lib
zlib125-static-mtdll.lib
zlib125-static-mtdll-debug.lib
liblept168.lib
liblept168d.lib
相对来说代码都相当简单了。
// my-leptonica.cpp : Defines the entry point for the console application.
// #include "stdafx.h" #include <allheaders.h> int _tmain(int argc, _TCHAR* argv[])
{
PIX *pixs, *pixt1, *pixt2;
pixs = pixRead("..\\..\\test\\test.bmp");
pixDisplayWithTitle(pixs, 700, 500, NULL, 1);
pixDestroy(&pixs);
return 0;
}
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以后的笔记潇汀会尽量详细讲解一些相关知识的，希望大家继续关注我的博客。
本节笔记到这里就结束了。
潇汀一有时间就会把自己的学习心得，觉得比较好的知识点写出来和大家一起分享。
编程开发的路很长很长，非常希望能和大家一起交流，共同学习，共同进步。
如果文章中有什么疏漏的地方，也请大家指正。也希望大家可以多留言来和我探讨编程相关的问题。
最后，谢谢你们一直的支持~~~
C++完整个代码示例（代码在VS2005下测试可运行）
