leptonica 学习笔记1

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Updated: April 26, 2015

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Leptonica is a pedagogically-oriented open source site containing software that is broadly useful for image processing and image analysis applications.

Leptonica 是一个面向教学的包含软件的开源站点，此软件对图像处理和图像分析应用十分有用。

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.

特定的操作是：

• 图形操作
• 仿射变换（缩放，旋转，修剪）在任意像素深度上
• 二值和灰度形态学操作，等级排序，卷积
• 种子填充和连通域
• 在尺度和深度上的图像转换
• 像素掩膜，混合，增强，算术操作等

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

辅助操作包括：

• 标准图像格式文件读写
• 操作图像想着数据类型数组的实用工具
• 通用栈、队列、堆和列表的工具；字节序列和数值和字符串数组。

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
• Book-adaptive text recognition
• 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

Reference documentation for users

• Tom Powers has built the Unofficial Leptonica Documentation. It covers all the information in these pages and is more easily navigated. You are encouraged to use it instead.
• The Leptonica image processing and analysis source code comes with a very weakly restricted copyright license.
• The README gives an overview of installation and usage, with a brief description of the library contents.
• A page of brief notes on version changes.
• A high-level view of the source files in the library.
• For a deeper look into specific components of the library, see the web pages linked from the image processing page.
• Uncompleted sets of somewhat detailed usage notesand a lightweight overview have been attempted but are unlikely to be completed anytime in the current millenium.
• The final arbiter is, of course, the source itself.

Source download

• Click here to download the source. [ update: April 26, 2015 ]
• See here for further information about the source code.