A Fast DCT Block Smoothing Algorithm S
نویسندگان
چکیده
e o When errors are clearly visible, the blockiness of some artifacts distinguishes them from th riginal image content, suggesting a way of reducing these artifacts. Presumably, the human viewer k e identifies the artifacts by assuming the image does not have 8-pixel by 8-pixel block features. Bloc dge variance, the sum of squared differences between adjacent block edge pixels, is one simple s m measure of blockiness. A similar measure offset from the block edge provides an estimate of what thi easure would be if the image were not blocky. In previous work, we found that using a global 5, 6
منابع مشابه
A fast degradation-free algorithm for DCT block extraction in the compressed domain
A fast, degradation-free solution for the DCT block extraction problem is proposed. The problem is defined as extracting a DCT block from a DCT compressed frame composed of DCT blocks. This problem is encountered in both video/image manipulations in the compressed domain and transcodecs, for example, converting from MPEG to Motion JPEG. Traditionally, solutions involve using the pixel domain ma...
متن کاملRemoving the blocking artifacts of block-based DCT compressed images
One of the major drawbacks of the block-based DCT compression methods is that they may result in visible artifacts at block boundaries due to coarse quantization of the coefficients. We propose an adaptive approach which performs blockiness reduction in both the DCT and spatial domains to reduce the block-to-block discontinuities. For smooth regions, our method takes advantage of the fact that ...
متن کاملReduction of Blocking artifacts in Compressed Medical Images
Medical images require large amounts of memory. This calls for image compression (blockbased DCT compression) to reduce significantly the amount of data required to represent an image. One of the major drawbacks of the block-based DCT compression methods is that it may result in visible artifacts at block boundaries due to coarse quantization of the coefficients. This paper proposes a new adapt...
متن کاملDeblocking Filtering Method Based on Separate Modes
Abstract –The compression of digital images has received wide attention of researchers since it reduces the memory, bandwidth and transmission requirements. One of the major drawbacks of the block-based DCT compression methods is that it may result in visible artifacts at block boundaries due to coarse quantization of the coefficients. This paper proposes a new post-filtering algorithm to remov...
متن کاملField programmable gate array (FPGA) realization of a fast 2-D discrete cosine transform algorithm for higher image compression
This paper describes the field programmable gate array (FPGA) implementation of a fast 2-D discrete cosine transform (DCT) chip for higher image compression ratio. The development of encoding and decoding parts of 2-D DCT algorithm is carried out by using Matlab simulation tools and VHSIC hardware descriptive language (VHDL). Comparisons of results for higher image compression ratio as obtained...
متن کامل