In turn, the second chapter reviews data coding and compression methods so as to set the background and demonstrate the complexity involved in dealing with MRC. Chapter three addresses the segmentation of images through an extensive literature review, which highlights the various approaches used to tackle MRC segmentation. The second part of the book focuses on the segmentation of color images for optimized compression, including multi-layered decomposition and representation of MRC and the processes that can be employed to optimize the coding rates of those different layers.
Rounding out the coverage, the final chapter examines the segmentation of color images for optimized transmission. The following ISBNs are associated with this title:.
2018 Mixed Raster Content: Segmentation, Compression, Transmission
ISBN - X. ISBN - Vision and color theory.
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Mixed Raster Content - Segmentation, Compression, Transmission | George Pavlidis | Springer
If the number of text pixels in the block is more than certain threshold, such as 20 out of pixels in the block, step 42 then the block is assigned 11 if it is already 10, or 01 if it is still 00 step Once the entire original image is processed block by block ending at step 48 , the accumulated tag image can then be analyzed as a whole to determine the content of the page.
If, in the tag image, there are more blocks that have either 11 or 01 value than a threshold block number step 50 , then the mask plane is not empty. The mask plane is then compressed and handled as regular case step Otherwise, the mask plane is empty, and the mask plane emptiness flag is set step No mask plane compression will happen, the mask plane is removed, and the resultant MRC file will have only a background plane. If a threshold number of blocks in the tag image have been assigned either 10 or 11 step 56 , then the background plane contains more than highlight area if any.
The background plane is then compressed using a nominal compression scheme, which is down-sampled into half resolution and compressed using less aggressive quantization step Otherwise the highlight detection operation will be activated to process the background further. If substantially all the blocks of the tag image have only a 00 or 01 value, then further highlight checking is needed, as can be seen in the continuation of the method shown in FIG.
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The highlight checking is done by determining if a threshold number of pixels inside each block have near white pixel value, for instance, between and step If this is the case, then the block will be assigned as 01 step 68 ; otherwise, it will be reset to be 00 step After highlight examination, if fewer than a threshold number of blocks, such as 20, have been detected that have highlight content with tag pixel value of 01 step 70 , then the whole background is judged to be blank, and the background emptiness flag is set step Otherwise, the background contains highlight areas, which may be aggressively sub-sampled, or otherwise aggressively compressed, to improve the file size step If both mask plane emptiness flag and background plane emptiness flag is set step 78 , then the page is empty, it can be disregarded or compressed as single pixel image step A method of processing an image file comprising at least a mask plane and a background plane, comprising: determining that at least one of the mask plane and background plane is substantially empty; and.
The method of claim 1 , further comprising determining that both the mask plane and background plane are substantially empty; and. The method of claim 1 , further comprising determining an extent of highlight pixels in the image. The method of claim 3 , further comprising as a result of determining an extent of highlight pixels in the image, determining that the background plane is empty.
The method of claim 3 , the determining an extent of highlight pixels in the image including considering the image file as a set of blocks in an image,. The method of claim 1 , the determining including modifying the mask plane, the modifying including assigning a subset of pixels in the mask plane to the background plane, and.yuzu-washoku.com/components/2020-08-24/3433.php
Reduce Documents and Images without Losing Quality with MRC Compression
The method of claim 6 , the modifying the mask plane including determining that a pixel in the mask plane is not associated with text. The method of claim 6 , the determining an extent of the subset of pixels assigned from the mask plane to the background plane including considering the image file as a set of blocks in an image,.
The method of claim 1 , the determining including modifying the background plane, the modifying including removing pixels associated with text from the background plane,. The method of claim 10 , modifying the background plane including replacing a pixel in the background plane that corresponds to black text with a value of at least one pixel that is not classified as text.
The method of claim 10 , the determining an extent of the pixels associated with black text in the background plane including considering the image file as a set of blocks in an image,. The method of claim 1 , further comprising determining an extent of near-white pixels in the background plane; and.
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