Research On The Algorithm Of Erotic Image Filtering System

With the constant development of Internet and multimedia technology, the spread of pornographic images becomes more and more serious. In order to purify the environment of Internet and construct a clean Internet space for the juveniles, the filtering of pornographic images is imperative under this situation. The available solutions include blocking Web addresses and filtering pornographic texts, but these are not the effective methods to filter the erotic images automatically. The Content Based Image Filtering (CBIF) is the preferred technology. This paper, which was for the sake of detecting and filtering the erotic images automatically, mainly discussed the implementation algorithm of filtering the erotic images.Generally speaking, the pornographic pictures usually contain plenty bare skin areas, so the skin pixels should be extracted firstly. The color of skin is clustering through statistical analysis. This paper introduced three skin-color detecting model: Statistical Color Model, Chroma Space Model and Gaussian Mixture Model. Through the comparing with the experiments, the Chroma Space Model was simply and had a good effect, so it was selected as the skin-color detecting model. In the next step, skin texture detection was necessary, which would decrease the rate of false skin detection. In this phase, the algorithm of simple grey statistics was selected as the textural model because of its simplicity and high performance.The filtering of erotic images belongs to the image pattern recognition. Based on the masked image which was got by the skin detection, morphological operation was used to reduce the effect of noises, then the features of masked image was extracted. In the subsequent section, two classifiers were compared: BP neural network and support vector machine (SVM), and the SVM was used in this system. At last, the Erotic Image Filtering System of personal computer was realized by synthesizing each module above, and the system could automatically detect and filter the erotic images on the whole.