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公开(公告)号：EP0501023A3
公开(公告)日：1993-06-09
申请号：EP91121001.1
申请日：1991-12-06
IPC分类号： H04N1/46
摘要： A system and method for improving the quality of the output of a full-color image on a reproduction device, such as a display on a monitor or printout from a printer, that only consists of a small number of colors in comparison to the number of colors represented by the input signals. The disclosure involves specifying a new quantization method for multi-color images, rendered with orthogonal or separable color image palettes, that takes advantage of the calculations done by error diffusion. Accordingly, the image input signals are processed using the quantization error generated by one color component of a given pixel to influence the quantization of subsequent color components of the same pixel, and in such a way that the color image, so rendered, appears less grainy.
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公开(公告)号：EP0149120B1
公开(公告)日：1991-02-27
申请号：EP84115007.1
申请日：1984-12-11
IPC分类号： G06F15/62
CPC分类号： G06T3/4023
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公开(公告)号：EP0202425A2
公开(公告)日：1986-11-26
申请号：EP86103848.7
申请日：1986-03-21
CPC分类号： H04N1/40062 , H04N1/4055
摘要： An electronic processing system for reproducing mixed images, ie, original images having areas of continuous tone and areas of text, in such a manner that both areas are of balancedm good quality in the reproduction. The image to be reproduced is (1) divided into non-overlapping 4 x 4 blocks of pixels or picture elements, and, (2) each block is classified as either of TEXT or IMAGE, based on the values of the 16 pixels within it. The classification is improved by (3) eliminating short runs of blocks with the same classification. The pixel values are then adjusted by appropriately (4) thresholding those in the TEXT blocks and, (5) averaging those in the IMAGE blocks. The IMAGE block values are quantized to one of 17 levels using an improved error diffusing process and then mapped onto a 4 x 4 pattern preparatory to (6) merging the binary images for the TEXT and IMAGE areas. Converting to various patterns to suit the output device such as a specific printer, is possible by permitting the conversion of the bits for an IMAGE block from one pattern table to another.
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公开(公告)号：EP0147701A3
公开(公告)日：1986-07-30
申请号：EP84115010
申请日：1984-12-11
IPC分类号： G06F15/62
CPC分类号： G06T3/606
摘要： 57 A method for rotation of a binary image by 180 degrees, includes the steps of: positioning first (Pl) and second (P2) address pointers at the center or at the beginning and end respectively of an image to be rotated; indexing the first pointer in a first direction through said image; indexing the second pointer in a second direction through said image; exchanging, for each index step, a first image word at the first pointer with a second image word, at the second pointer if the first image word and the second image word have any two bits with different values; reversing all exchanged words; storing the reversed, exchanged words at said pointer locations; repeating the above steps until the first pointer and the second pointer have been indexed through all words in the image at which point the image has been rotated by 180 degrees.
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公开(公告)号：EP0853294A3
公开(公告)日：2000-01-12
申请号：EP97310312.0
申请日：1997-12-19
IPC分类号： G06T11/00
CPC分类号： G06T1/0021 , H04N1/32203 , H04N1/32208 , H04N1/32229 , H04N1/32352 , H04N2201/3233 , H04N2201/3269
摘要： A system quickly verifies that the content of an image has not been changed since an earlier time when the content of that image was stamped. The system consists of a stamping process that embeds stamping information into a source image and produces a verification key, and a verification process that extracts stamping information from a stamped source image based on the verification key. Furthermore, the verification process produces an image itself, from which the verification can be readily judged visually or by use of a computer or other display device. In the verification process, the changes in an image can be detected and localized. The image stamping process further includes an error diffusion process so that the effects of combining the stamping information with the original image are not readily perceptable. An image is safeguarded against malicious manipulations and the proprietary rights are protected by maintaining the integrity of the image content.
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公开(公告)号：EP0202425B1
公开(公告)日：1991-05-22
申请号：EP86103848.7
申请日：1986-03-21
CPC分类号： H04N1/40062 , H04N1/4055
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公开(公告)号：EP0202425A3
公开(公告)日：1987-09-16
申请号：EP86103848
申请日：1986-03-21
IPC分类号： H04N01/415 , G06F15/66
CPC分类号： H04N1/40062 , H04N1/4055
摘要： An electronic processing system for reproducing mixed images, ie, original images having areas of continuous tone and areas of text, in such a manner that both areas are of balancedm good quality in the reproduction. The image to be reproduced is (1) divided into non-overlapping 4 x 4 blocks of pixels or picture elements, and, (2) each block is classified as either of TEXT or IMAGE, based on the values of the 16 pixels within it. The classification is improved by (3) eliminating short runs of blocks with the same classification. The pixel values are then adjusted by appropriately (4) thresholding those in the TEXT blocks and, (5) averaging those in the IMAGE blocks. The IMAGE block values are quantized to one of 17 levels using an improved error diffusing process and then mapped onto a 4 x 4 pattern preparatory to (6) merging the binary images for the TEXT and IMAGE areas. Converting to various patterns to suit the output device such as a specific printer, is possible by permitting the conversion of the bits for an IMAGE block from one pattern table to another.
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公开(公告)号：EP0149119A2
公开(公告)日：1985-07-24
申请号：EP84115005.5
申请日：1984-12-11
IPC分类号： G06F15/62
CPC分类号： G06T3/602
摘要： Method for rotating an image by 90 degrees includes the steps of: storing the image in a raster format arranged in r rows by c columns, image information in each row being stored in a number of bytes, each byte having b bits, there being c/b bytes in each row of the raster format; moving a block of the image into a temporary storage, there being n rows by m columns in the block; separating each image block into groups of bytes of rotatable size; determining for each group if all bits are the same value; rotating each group that does not have all bits the same value; storing each rotated group in an output area of the raster storage; repeating the above steps for all remaining blocks of the image.
摘要翻译： 用于将图像旋转90度的方法包括以下步骤：以r行×c列排列的栅格格式存储图像，每行中的图像信息以多个字节存储，每个字节具有b位，存在c / b字节在栅格格式的每一行; 将图像块移动到临时存储器中，块中存在n行×m列; 将每个图像块分成可转动大小的字节组; 如果所有位都是相同的值，则确定每个组; 旋转不具有相同值的所有位的每个组; 将每个旋转的组存储在光栅存储器的输出区域中; 对图像的所有剩余块重复上述步骤。
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公开(公告)号：EP0853294B1
公开(公告)日：2004-08-04
申请号：EP97310312.0
申请日：1997-12-19
IPC分类号： G06T11/00
CPC分类号： G06T1/0021 , H04N1/32203 , H04N1/32208 , H04N1/32229 , H04N1/32352 , H04N2201/3233 , H04N2201/3269
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