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    • 72. 发明授权
    • Image compression and restoring method for binary images
    • 二进制图像的图像压缩和恢复方法
    • US06944347B2
    • 2005-09-13
    • US10143069
    • 2002-05-10
    • Chul Soo LeeHyun Wook Park
    • Chul Soo LeeHyun Wook Park
    • H04N1/415G06K9/36G06K9/46G06T5/00G06T9/00H03M7/40H04N1/41
    • H04N19/90H04N19/13H04N19/91
    • The present invention relates to the image compression and restoring method for binary images that can be used in binary image equipment including printers.In the present invention, an image is not compressed by each pixel but by cell that combines four pixels. And each cell is compressed in two steps. In the first step, the number of black pixels contained in the cell is compressed. And in the second step, using the number of pixels the information compressed in the previous step, the exact location of pixels that constitute the cell is compressed. By doing this, the compression rate can be increased. And even when the compressed bit rows are restored in the first step, image restoration is available with just a small degradation.
    • 本发明涉及可用于包括打印机在内的二进制图像设备中的二进制图像的图像压缩和恢复方法。 在本发明中,图像不被每个像素压缩,而是被组合四个像素的单元压缩。 并且每个单元格分两个步骤进行压缩。 在第一步骤中,包含在单元格中的黑色像素的数量被压缩。 并且在第二步骤中,使用在前一步骤中压缩的信息的像素数,构成单元格的像素的精确位置被压缩。 通过这样做,可以提高压缩率。 即使在第一步中恢复压缩位行时,只能稍微降低图像恢复。
    • 74. 发明授权
    • Image signal encoding apparatus
    • 图像信号编码装置
    • US6118552A
    • 2000-09-12
    • US693382
    • 1996-08-06
    • Kazuhiro SuzukiToshiaki YoshinariTaro YokoseKen Umezawa
    • Kazuhiro SuzukiToshiaki YoshinariTaro YokoseKen Umezawa
    • G06T9/00H04N1/41H04N1/64H04N1/415H04N1/46
    • H04N1/642
    • An image signal encoding apparatus reads an image from an original and converts the image into color data values including lightness and chromaticity components. The data values are stored and divided into pixel blocks with data values of lightness components and pixel blocks with data values of chromaticity components. Average lightness component data values are computed for pixel blocks of lightness components and average chromaticity data values are computed for pixel blocks of chromaticity components. A region determination is made whether the pixel blocks correspond to color, monochrome or background region in the original based on the average pixel block data values of lightness components and chromaticity components. A switch outputs the lightness pixel block data values during the region determination, and outputs the lightness and chromaticity pixel block data values after the region determination. The lightness pixel block data values are adaptively bi-level connected based on the result of the region determination. A bi-level image encoder encodes lightness pixel block data values converted by adaptive bi-level conversion and the result of the region determination is stored as region information. A color image encoder encodes the chromaticity pixel block data values consisting of man pixels determined to correspond to the color region based on the stored region information after the region determination process on the whole original is completed and a transmitter transmits at least one of the set of data values encoded by the bi-level image encoder and the set of data values encoded by the color image encoder.
    • 图像信号编码装置从原件读取图像并将图像转换为包括亮度和色度分量的颜色数据值。 将数据值存储并分割为具有亮度分量的数据值和具有色度分量的数据值的像素块的像素块。 对亮度分量的像素块计算平均亮度分量数据值,并且计算色度分量的像素块的平均色度数据值。 基于亮度分量和色度分量的平均像素块数据值,确定像素块是否对应于原始图像中的颜色,单色或背景区域。 A开关在区域确定期间输出亮度像素块数据值,并且在区域确定之后输出亮度和色度像素块数据值。 基于区域确定的结果,亮度像素块数据值被自适应地双级连接。 双电平图像编码器编码通过自适应双电平转换转换的亮度像素块数据值,并且将区域确定的结果存储为区域信息。 彩色图像编码器在对整个原稿进行区域确定处理完成之后,基于所存储的区域信息,对由确定为对应于颜色区域的人物像素组成的色度像素块数据值进行编码,并且发送器发送该组图像中的至少一个 由双电平图像编码器编码的数据值和由彩色图像编码器编码的数据值集合。
    • 77. 发明授权
    • Compression/expansion circuit having transfer means and storage means
with address management of the storage means
    • 具有传送装置的压缩/扩展电路和存储装置的地址管理的存储装置
    • US5905821A
    • 1999-05-18
    • US352429
    • 1994-12-08
    • Hiroshi NonoshitaYasuhisa Ishizawa
    • Hiroshi NonoshitaYasuhisa Ishizawa
    • H04N1/415G06T9/00H04N1/41H04N1/417G06K9/32
    • H04N1/41H04N1/4172
    • A compressing/expanding circuit for compressing and expanding image data by a JBIG method comprises a memory medium such as floppy disk or hard disc to store the image data, a compressing circuit to compress the data, an expanding circuit to expand the data, a transfer circuit to transfer the data stored in the memory medium to the compressing circuit or expanding circuit, a storage controller to store the data compressed by the compressing circuit or the data expanded by the expanding circuit to the memory medium, a compression controller to control the transfer circuits compressing circuit, and storage controller so as to repetitively operate, an expansion controller to control the transfer circuit, expanding circuit, and storage controller so as to repetitively operate, and a designating circuit to designate either one of the compressing process and the expanding process. In the case where the compressing process is designated by the designating circuit, the transfer circuit, compressing circuit, and storage controller are controlled by the compression controller. In the case where the expanding process is designated by the designating circuit, the transfer circuit, expanding circuit, and storage controller are controlled by the expansion controller.
    • 用于通过JBIG方法压缩和扩展图像数据的压缩/扩展电路包括诸如软盘或硬盘的存储介质以存储图像数据,压缩电路来压缩数据,扩展电路来扩展数据,传输 将存储在存储介质中的数据传送到压缩电路或扩展电路的电路,存储控制器,用于将由压缩电路压缩的数据或由扩展电路扩展的数据存储到存储介质;压缩控制器,用于控制传输 电路压缩电路和存储控制器以便重复操作,扩展控制器来控制传输电路,扩展电路和存储控制器以便重复操作;以及指定电路来指定压缩过程和扩展过程之一 。 在由指定电路指定压缩处理的情况下,由压缩控制器控制传送电路,压缩电路和存储控制器。 在由指定电路指定扩展处理的情况下,由扩展控制器控制传送电路,扩展电路和存储控制器。
    • 79. 发明授权
    • Method and apparatus for post-processing images
    • 用于后处理图像的方法和装置
    • US5850294A
    • 1998-12-15
    • US573705
    • 1995-12-18
    • John G. ApostolopoulosNuggehally Sampath Jayant
    • John G. ApostolopoulosNuggehally Sampath Jayant
    • G06T9/00H04N1/41H04N7/26H04N7/30H04N1/415
    • H04N19/527H04N19/86
    • The invention is an image transmitting method and system including receiving encoded images, decoding those images and post-processing the decoded images. The post-processing reduces visual artifacts, such as blocking artifacts and mosquito noise, through separate detection, mapping and smoothing operations while avoiding many of the complexities associated with existing techniques. In detecting blocking artifacts, the inventive method employs DCT-domain detection rather than edge detection in the pixel domain. Also, the interior of a detected block is updated based on the surrounding blocks without disturbing the surrounding blocks. In reducing mosquito noise, the inventive method smooths the non-edge pixels within blocks containing edge pixels rather than smoothing the edge pixels. Also, distortion-induced false edge pixels are distinguished from true edge pixels and heavily smoothed. The post-processing method and system is generally applicable to Block DCT based compression systems, either intrinsically or extrinsically.
    • 本发明是一种图像发送方法和系统,包括接收编码图像,解码那些图像并对解码的图像进行后处理。 后处理通过单独的检测,映射和平滑操作来减少视觉伪像,例如阻塞伪像和蚊式噪声,同时避免与现有技术相关的许多复杂性。 在检测到块伪影时,本发明的方法在像素域中采用DCT域检测而不是边缘检测。 此外,基于周围的块来更新检测块的内部,而不干扰周围的块。 在减少蚊子噪声方面,本发明的方法平滑了包含边缘像素的块内的非边缘像素,而不是平滑边缘像素。 此外,失真诱发的假边缘像素与真实边缘像素区分开,并且被大量平滑化。 后处理方法和系统通常适用于本质上或外在的基于块DCT的压缩系统。