Skimpy A collection of tools for generating audio and visual (PNG/HTML/WAVE) for use in web sites
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image generate convert audio generator generate image image generator

Skimpy Description

A collection of tools for generating audio and visual (PNG/HTML/WAVE) for use in web sites Skimpy is an open source tool for generating PNG visual, HTML visual, and WAVE audio representations for strings which people can understand but which web robots and other computer programs will have difficulty understanding. Skimpy is an example of a Captcha: an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart".The visual HTML and PNG Skimpy generators translate words or phrases into strings containing HTML preformatted text or PNG image files respectively. The preformatted text contains "ASCII art" representing the input phrase, which looks like somewhat sloppy handwriting on a speckled page, when viewed in an HTML browser. The PNG image contains a "pixelized" version of the word or phrase with added noise.Skimpy is intended that it is easy for a human to read the word or phrase when rendered as HTML, but it is difficult for a program to extract the word or phrase automatically. Skimpy uses a number of techniques to make the output difficult for a computer to interpret including the addition of noise. The preformatted text version is probably more secure than the PNG version, but it is also harder to read (not surprisingly).In order to allow CAPTCHA tests that are usable by people with visual empairment, Skimpy also provides an audio implementation. The audio WAVE Skimpy program uses a compiled audio sample file waveIndex.zip. The input of the program are words or phrases and the output are the words or phrases spelled as individual spoken characters in an audio stream.Skimpy is intended that a human can understand the audio stream but a computer program will not be able to analyse the stream and extract the letters. To make the audio stream more difficult to automatically analyse (without making it unintelligible) the program randomly overlaps and stretches/shrinks the input samples, among other things.

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