A INFLUÊNCIA DO ESPAÇO DE CORES NA COMPRESSÃO JPEG DE IMAGENS ORBITAIS

Abstract

There must be a comprehension for the storage of orbital images, not only because of its size, but also because of the amount of images. This work evaluates the use of JPEG pattern which is very robust and that gives a high rate of compression. For this evaluation, an implementation of the JPEG pattern has been developed which uses three space of colors: RGB, HIS and YCBCR and compares four different algorithms for the transformed of the cosine: using the expression of the transformed (S), using the product of matrix (PM), using factorization of the matrix of cosine which we call optimized (O) and also the progressive codification (P) of the transformed image. The results show that the use of the space YCBCR is the most appropriate. The progressive codification is lightly slower, however the visualization of the results is much more friendly in relation to the user. That confirms the potentiality of this pattern for the Internet use. A small summary of the orbital images and space of colors takes part of this work to facilitate the comprehension.

Keywords

• Compression
• DCT
• JPEG
• Orbital Images.