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1. 发明授权

US5123059A Gradation converting circuit employing lookup table 失效
标题翻译：升级转换电路使用LOOKUP表
公开(公告)号：US5123059A
公开(公告)日：1992-06-16
申请号：US249984
申请日：1988-09-27
申请人： Makoto Hirosawa , Masami Aragaki
发明人： Makoto Hirosawa , Masami Aragaki
IPC分类号： H04N1/40 , H04N1/407
CPC分类号： H04N1/4072 , H04N1/40
摘要： A gradation converting circuit for converting digital input data to output data, in accordance with a predetermined input/output relationship. The input and output data is provided as data words having a predetermined number of bits "m". Since the resolution provided in the output by the "m" bits is insufficient for accurately expressing the aforementioned input/output relationship and to satisfy a demand to keep the number of bits at "m", an improved output resolution is obtained by varying the value outputted for any given input data over time such that the average of the outputs is closer to a desired output demanded by the input/output relationship. This is accomplished either by storing, for each input data, a plurality of outputs whose average is equal to the desired predetermined, input/output relationship, or, by outputting for each digital input data a so-called "decimal" value which is indicative of how often a fixed predetermined output value should be increased by one such that the average of the output should approximate the desired output value.

2. 发明授权

US5204738A Method of an apparatus for compressing images data 失效
标题翻译：压缩图像数据的方法
公开(公告)号：US5204738A
公开(公告)日：1993-04-20
申请号：US627739
申请日：1990-12-14
申请人： Masami Aragaki
发明人： Masami Aragaki
IPC分类号： H04N1/41 , G06T9/00 , H04N1/64 , H04N7/26 , H04N7/30 , H04N11/04
CPC分类号： H04N11/044 , H04N1/646 , H04N19/154 , H04N19/60
摘要： An image is conceptually divided into pixel blocks each having a plurality of pixels. RGB image data representing the image are converted into luminance data and color difference data in the NTSC form. Standard deviation values of these data are calculated in each pixel block and are compared with threshold values, so that the pixel blocks are classified into two types. The image data in the pixel blocks of respective types are compressed at different compression rates to obtain image data compressed.

3. 发明授权

US4903138A Method of and apparatus for eliminating interblock distortion due to compressed image data 失效
标题翻译：用于消除压缩图像数据造成的块间失真的方法和装置
公开(公告)号：US4903138A
公开(公告)日：1990-02-20
申请号：US333444
申请日：1989-04-05
申请人： Masami Aragaki
发明人： Masami Aragaki
IPC分类号： G03F3/08 , G06T5/00 , G06T9/00 , H04N1/41 , H04N1/415 , H04N7/133
CPC分类号： H04N19/98 , H04N1/41
摘要： Interblock distortion often appears on a boundary of pixel blocks in a reproduced image produced from compressed image data. The interblock distortion is eliminated by correcting a density distribution in the reproduced image. First, an average density (A.sub.ij) of a selected pixel block (B.sub.ij) is computed. Second, a standard deviation (.sigma..sub.ij) of a density distribution in the selected deviation is computed. If the standard deviation is equal to zero, correction value distributions (.DELTA.f.sub.m, .DELTA.f.sub.n) along a main scanning direction and a subscanning direction are obtained. Finally, corrected density distribution (f.sub.mn) is obtained as a sum of the average density and the correction value distributions.
摘要翻译：在由压缩图像数据产生的再现图像中的像素块的边界上经常出现块间失真。通过校正再现图像中的浓度分布来消除帧间失真。首先，计算出所选择的像素块（Bij）的平均密度（Aij），其次计算所选择的偏差中的密度分布的标准偏差（sigma ij），如果标准偏差等于零，则校正值分布 DELTA fm，DELTA fn）沿主扫描方向和副扫描方向。最后，获得校正密度分布（fmn）作为平均密度和校正值分布之和。

4. 发明授权

US5187755A Method of and apparatus for compressing image data 失效
标题翻译：用于压缩图像数据的方法和装置
公开(公告)号：US5187755A
公开(公告)日：1993-02-16
申请号：US369423
申请日：1989-06-21
申请人： Masami Aragaki
发明人： Masami Aragaki
IPC分类号： H04N7/26 , H04N7/30
CPC分类号： H04N19/154 , H04N19/124 , H04N19/132 , H04N19/60
摘要： Image data (f.sub.ij) depicting an image in a pixel block are converted by 2-D Discrete Cosine Transformation into transformation coefficients (F.sub.mn or F.sub.mn *). Only a part of the coefficients are employed to form compressed image data (D.sub.t). The selection of the part of the coefficients is executed using code tables (CT). Several groups of code tables are prepared, and one of those groups is selected in the data compression operation in response to a standard deviation (.sigma.) of the image data in the pixel block. When the compressed image data is restored, identification data specifying the selected group in the previous data compression is stored in the restored image data. Then, in the next data compression of the restored image data, the selected group is again selected as a function of the identification data.

5. 发明授权

US4992887A Method of storing and transmitting image data as an image file suitable for an image search 失效
标题翻译：存储和传输图像数据作为适合于图像搜索的图像文件的方法
公开(公告)号：US4992887A
公开(公告)日：1991-02-12
申请号：US306573
申请日：1989-02-03
申请人： Masami Aragaki
发明人： Masami Aragaki
IPC分类号： G09G5/36 , G06F17/30 , G06T1/00 , G06T9/00 , G09G5/00 , H04N1/21 , H04N1/41
CPC分类号： G06T9/00 , G06F17/3028
摘要： An image file consists of a file header, reduced-and-compressed image data, and compressed original image data. The reduced-and-compressed image data is obtained by compressing reduced image data expressing a reduced image of an original image in serial order of bit planes. The reduced image is then reproduced and displayed on an image display for an image search, in place of the original image itself, whereby efficiency in an image search is improved.

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