Introduction

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

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
• 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

More information on Leptonica's homepage

http://www.leptonica.com/

For questions and suggestions contact

Dan Bloomberg (bloomberg 'at' ieee 'dot' org)