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公开(公告)号：EP0066697B1
公开(公告)日：1985-09-04
申请号：EP82103339.6
申请日：1982-04-21
IPC分类号： H04N1/41
CPC分类号： H03M7/4006 , H04N19/124 , H04N19/13 , H04N19/50 , H04N19/60 , H04N19/91
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公开(公告)号：EP0113016A3
公开(公告)日：1987-04-29
申请号：EP83111645
申请日：1983-11-22
IPC分类号： H04N01/40
摘要： Nonlinear shading correction of an image to improve readability and data compression is effected by means for generating a histogram of distribution of gray scale intensity levels, means for calculating from the histogram first, second and third gray scale intensity values, means for determining image polarity, means for determining an acceptable range of background gray scale variation, means for sampling gray scale intensity values in a region around a current pel, means for calculating a correction value for the current pel by comparing the gray scale value of the current pel with the range of background gray scale variation, means for setting the correction value to a predetermined constant if the gray scale value of the current pel is outside the range of acceptable background variation, and means for correcting the current pel gray scale value by subtracting therefrom the correction value to achieve a shading corrected value for the current pel.
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公开(公告)号：EP0066697A1
公开(公告)日：1982-12-15
申请号：EP82103339.6
申请日：1982-04-21
IPC分类号： H04N1/41
CPC分类号： H03M7/4006 , H04N19/124 , H04N19/13 , H04N19/50 , H04N19/60 , H04N19/91
摘要： The present invention relates to a method and system for compacting grey-scale image data. The system permits the use of a «zero bit» per pel mode for the data transmission (1 «error bit» per pel actually transmitted) and provides for the automatic detection of the particular variable length compression code utilized for transmitting the quantized error (Ey) for a particular pel. Utilizing the concepts of the present invention compression rates of approximately 1.5 bits have been obtained. The system comprises, first prediction means (28) for predicting the grey scale value of a current pel which is to be transmitted, utilizing the values of previously transmitted pels, second prediction means (26) for predicting the code which should suffice for transmitting the quantized error for correcting the predicted pel grey scale value to approximately the true value of said pel, means for determining the code which is actually needed to encode the quantized error, means (30) for producing a first special purpose code bit when the predicted range of codes for encoding the quantized error is sufficient and a different bit when it is insufficient, and means (30) for generating a first quantized error code when the predicted range of codes is sufficient and a second code when it is insufficient.
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公开(公告)号：EP0114961B1
公开(公告)日：1988-07-20
申请号：EP83111644.7
申请日：1983-11-22
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公开(公告)号：EP0130415A3
公开(公告)日：1986-05-21
申请号：EP84106537
申请日：1984-06-08
CPC分类号： G06T9/00
摘要： A first bit plane (bit array) is generated of the graphic image, and then, by comparison/logic circuitry, a second bit plane is generated which identifies only pixels of the graphics image representing edges e.g. of characters or lines in the image. The data stream representing the image from the first bit plane is supplemented by edge bits from the second bit plane.
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公开(公告)号：EP0114961A3
公开(公告)日：1985-11-06
申请号：EP83111644
申请日：1983-11-22
摘要： Filtering noise from digital video images is achieved by means for determining first difference values between intensity values of current pel and one or more preceding pels, means for determining second difference values between intensity values of the current pel and one or more succeeding pels, means for limiting any of the first and second difference values that exceed a predetermined limit value, and means for generating a filtered value for the current pel by adding the intensity value of the pel to a scale summation of the limited first and second difference values.
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公开(公告)号：EP0130415A2
公开(公告)日：1985-01-09
申请号：EP84106537.8
申请日：1984-06-08
CPC分类号： G06T9/00
摘要： A first bit plane (bit array) is generated of the graphic image, and then, by comparison/logic circuitry, a second bit plane is generated which identifies only pixels of the graphics image representing edges e.g. of characters or lines in the image. The data stream representing the image from the first bit plane is supplemented by edge bits from the second bit plane.
摘要翻译： 生成图形图像的第一位平面（位阵列），然后通过比较/逻辑电路产生第二位平面，其仅标识表示边缘的图形图像的像素。 的图像中的字符或行。 表示来自第一位平面的图像的数据流由来自第二位平面的边沿位补充。
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10.发明公开
公开(公告)号：EP0114961A2
公开(公告)日：1984-08-08
申请号：EP83111644.7
申请日：1983-11-22
摘要： Filtering noise from digital video images is achieved by means for determining first difference values between intensity values of current pel and one or more preceding pels, means for determining second difference values between intensity values of the current pel and one or more succeeding pels, means for limiting any of the first and second difference values that exceed a predetermined limit value, and means for generating a filtered value for the current pel by adding the intensity value of the pel to a scale summation of the limited first and second difference values.
摘要翻译： 通过用于确定当前像素的强度值和一个或多个先前像素的强度值之间的第一差值来实现来自数字视频图像的滤波噪声，用于确定当前像素的强度值与一个或多个后续像素之间的第二差值的装置， 限制超过预定极限值的第一和第二差分值中的任何一个，以及用于通过将有效值的第一和第二差值的比例相加将像素的强度值相加来生成当前像素的滤波值的装置。
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