Compressão de imagens utilizando o método DCT by Mohamed Bencheikh
Compressão de imagens utilizando o método DCT

Compressão de imagens utilizando o método DCT


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About the Book

A compressão de imagens permite reduzir a capacidade de memória de uma imagem para que esta possa ser enviada através de uma rede informática ou transportada num suporte de armazenamento. Esta redução da capacidade de memória não deve deteriorar significativamente a qualidade da imagem comprimida. O método DCT (Transformada discreta do cosseno) baseia-se na transformada de Fourier. O processamento de imagem (compressão) discutido neste livro é baseado num programa escrito em MATLAB. Para verificar a qualidade da compressão da imagem, é efectuada uma descompressão da imagem, avaliando a taxa de deterioração da sua qualidade. A imagem é recuperada mas com uma determinada percentagem de deterioração em relação ao seu estado inicial. O trabalho de compressão neste livro é efectuado em imagens de diferentes tamanhos (imagens de pizza e de câmara). As imagens processadas por este programa são imagens em formato JPG com uma forma de matriz quadrada e são apresentadas a nível de cinzento. No futuro, iremos estender este programa para comprimir as imagens a cores e em formato rectangular com uma melhor qualidade.


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Product Details
  • ISBN-13: 9786205964019
  • Publisher: KS Omniscriptum Publishing
  • Publisher Imprint: Edicoes Nosso Conhecimento
  • Height: 229 mm
  • No of Pages: 52
  • Spine Width: 3 mm
  • Width: 152 mm
  • ISBN-10: 6205964015
  • Publisher Date: 04 May 2023
  • Binding: Paperback
  • Language: Portuguese
  • Returnable: N
  • Weight: 141 gr


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Compressão de imagens utilizando o método DCT
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