[MASOCH-L] Análise de imagens

[agerhard at usp.br]

Pessoal,

Aparentemente alguns algoritmos detectam a pele e areas da figura
que lembram pedacos do corpo humano. Depois se aplicam metodos
matematicos para classificar a imagem em pornografica e nao
pornografica (com a possibildade de haver falsos positivos/negativos,
como numa analise bayesiana de spam - mas com certeza diminuindo a
quantidade de imagens que precisam ser analisadas manualmente).


Finding Naked People:
http://www.cs.hmc.edu/~fleck/naked.html


Region-based Pornographic Image Detection

Abstract
Recent advantages in digital images and networks have made  
pornographic images more accessible than ever. Methods of detecting  
pornographic images have been proposed in some existing work. However,  
the skin detection modules adopted are all pixel-based and skin region  
shape features are rarely properly used. This paper presents a  
framework for pornographic image detection based on skin region  
information. Different from traditional works, our approach extracts  
color and texture features from arbitrary-shaped segmented regions.  
Then Gaussian mixture models are built for skin and non-skin region  
classification, and the skin map is produced based on the  
classification result. Finally, eigenregion features are used to  
describe the layout of skin regions on the whole image and  
pornographic images are detected according to the skin modality

http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4013947


Uma patente:

Automated detection of pornographic images
United States Patent 6751348

Abstract:
A method of detecting pornographic images, wherein a color reference  
database is prepared in LAB color space defining a plurality of colors  
representing relevant portions of a human body. A questionable image  
is selected, and sampled pixels are compared with the color reference  
database. Areas having a matching pixel are subjected to a texture  
analysis to determine if the pixel is an isolated color or if other  
comparable pixels surround it; a condition indicating possible skin.  
If an area of possible skin is found, the questionable image is  
classified as objectionable. A further embodiment includes preparation  
of a questionable image reference shape database defining  
objectionable shapes. An image with a detected area of possible skin  
is compared with the shape database, and depending on the results of  
the shape analysis, a predefined percentage of the images are  
classified for manual review.

http://www.freepatentsonline.com/6751348.html


Andre Gerhard
Universidade de Sao Paulo