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Master's Dissertation
DOI
10.11606/D.55.2018.tde-27062018-154448
Document
Author
Full name
Ana Cristina dos Santos
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1994
Supervisor
Committee
Meneguette Junior, Messias (President)
Iano, Yuzo
Traina, Agma Juci Machado
Title in Portuguese
UMA TÉCNICA POR TRANSFORMADA PARA COMPRESSÃO DE IMAGENS
Keywords in Portuguese
Não disponível
Abstract in Portuguese
A representação digital de imagens exige um número muito grande de bits, ocupando muito espaço de memória. A fim de reduzir o custo de transmissão ou armazenagem, preservando a qualidade da imagem, recorre-se à técnicas de codificação e compressão. Este trabalho apresenta um módulo "adaptativo" de compressão baseado na transformada discreta do co-seno (DCT), onde a quantização é feita utilizando duas matrizes atribuições de bits geradas a partir das variâncias dos blocos de coeficientes transformados; e o código de Huffman é utilizado para associar aos coeficientes quantizados uma palavra de código de comprimento variável.
Title in English
Not available
Keywords in English
Not available
Abstract in English
The digital representation of an image requires a very large amount of bits, i.e. too much storage space. In order to reduce transmission/storage costs, as well as preserving quality, one uses compactation and compression techniques. This work presents an "adaptative" image compression module based on discrete cosine transform (DCT), where quantization is done through two matrices of bits obtained from the coefficient variance; Huffman algorithm is used to associate o quantized coefficients to a variable length word.
 
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Publishing Date
2018-06-27
 
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