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81. 发明专利

JPH05204361A METHOD AND DEVICE FOR CONTOUR EXTRACTION 失效
公开(公告)号：JPH05204361A
公开(公告)日：1993-08-13
申请号：JP1201492
申请日：1992-01-27
申请人： CANON KK
发明人： KATAYAMA AKIHIRO , ISHIDA YOSHIHIRO , YAMAKAWA JUNICHI
IPC分类号： G09G5/24 , G06T7/60
摘要： PURPOSE:To speedily extract the contour of an image from image data by using a small-capacity memory. CONSTITUTION:The image data are received from a signal line 500 and an aimed picture element and its nearby picture elements are held in latches 502-504, and 507-512. A CPU 519 detects a horizontal and a vertical picture element array vector according to the state of the aimed picture element and its nearby picture elements and discriminates and stores the mutual connection states of those picture element array vectors in a connection information table on a memory 520. An aimed raster on which all picture elements are white picture elements is detected and when it is detected, the stored connection information table is scanned to extract contour points, and then cleared. The aimed picture element is taken out in the order of raster scanning and the processing is repeated to perform processing covering all object image data.

82. 发明专利

JPH05130426A PICTURE CODER 失效
公开(公告)号：JPH05130426A
公开(公告)日：1993-05-25
申请号：JP29022791
申请日：1991-11-06
申请人： CANON KK
发明人： KATAYAMA AKIHIRO
IPC分类号： G06K9/20 , G06T9/00 , H04N1/40 , H04N1/41
摘要： PURPOSE:To provide the picture processing unit in which a picture is coded/ decoded with a high efficiency. CONSTITUTION:An edge detecting section 21 detects an edge of a picture and a 1st color detecting section 22 detects a prescribed color and a 1st color character extracting section 23 inputting the result extracts a skelton section of a color character. Then a color around the picture element detected by a color character is checked by a 2nd color detection section 24 and a 2nd color character extracting section 25 receives a color character made thick to a skelton of the color character extracted by the 1st color character extract section 23. Moreover a thin line detection section 26 judges it to be a thin part of the color character when the color is processing color by an edge picture element and a synthesis section 27 synthesizes the character with the color character from the 2nd color character extract section 25, from which the color character is outputted finally.

83. 发明专利

JPH04293363A METHOD AND DEVICE FOR PICTURE PROCESSING 失效
公开(公告)号：JPH04293363A
公开(公告)日：1992-10-16
申请号：JP5881091
申请日：1991-03-22
申请人： CANON KK
发明人： KATAYAMA AKIHIRO
IPC分类号： H03M7/30 , G06F5/06 , G06T9/00 , H04N1/40 , H04N1/41 , H04N1/46
摘要： PURPOSE:To attain the transmission of an efficient picture data and to simplify the circuit constitution by outputting an encoded brightness signal and a coded chrominance signal as to a picture element in a specific output mode. CONSTITUTION:An encoder side sends, e.g. two blocks Y1a-Ysb of a brightness (Y) component in one upper block line and a chrominance (Cr, Cb) component corresponding to the blocks in pairs. Then Y components Y1c-Ysd in remaining one lower block lines is sent. A decoder side stores one block line each of two blocks of Y signal and the Cr, Cb signal to a buffer memory. In this case, the data corresponding to the one lower block line of the Cr, Cb signal is stored in a line memory. When the components Y1c-Ysd corresponding to the lower block line are sent, the required Cr, Cb data are read from the line memory and used. Thus, the capacity of the line memory at the decoder side is reduced.

84. 发明专利

JPH03231565A PICTURE CODING DEVICE 失效
公开(公告)号：JPH03231565A
公开(公告)日：1991-10-15
申请号：JP2765890
申请日：1990-02-06
申请人： CANON KK
发明人： KATAYAMA AKIHIRO , YASUDA YASUHIKO , KATO SHIGEO
IPC分类号： H04N1/41 , G06T9/00 , H03M7/30 , H04N1/46
摘要： PURPOSE:To attain efficient coding while keeping picture quality high by applying different coding to a black line part and to other part. CONSTITUTION:A black edge such as a black letter or the like is discriminated for each block at first and the pattern is stored in a frame memory 4d. Then an average value (as to each component of R, G, B) of parts other than a black line picture is obtained from an input picture and a difference between the average value and the R, G, B component of the black line picture is subtracted together. The subtracted picture data R', G', B' are converted into a luminance component data Y and color component data U, N at an RGB-YUV conversion section 36 and stored respectively to frame memories 4a-4c. Then a conversion coefficient is obtained from the picture data inputted area sequentially as Y,U,V at an orthogonal conversion coding section 8. Then the pattern information stored in a frame memory 4d is coded by a pattern coding section 7 and sent to a coding data transmission section 9. Thus, the quality of the black line picture is kept.

85. 发明专利

JPH02177766A HIERARCHICAL ENCODING SYSTEM FOR BINARY IMAGE 失效
公开(公告)号：JPH02177766A
公开(公告)日：1990-07-10
申请号：JP33263788
申请日：1988-12-28
申请人： CANON KK
发明人： KATAYAMA AKIHIRO , MAEDA MITSURU , HIRABAYASHI KOJI , YOSHIDA TADASHI
IPC分类号： H04N1/41 , H04N1/40 , H04N1/417
摘要： PURPOSE:To encode satisfactorily without missing a character or a thinning line by forming a second image with resolution different from that of a first image, and changing the number and the position of picture elements to be referred for the encode at the time of performing the encode of the first and second images, respectively. CONSTITUTION:Reference picture element decision circuits 10, 12, and 14 detect the size (number of picture elements) of image data stored in frame memories 9, 5, and 1, respectively, and set the optimum number and position of reference picture elements at the time of performing the encode. An encoder 11 encodes 1/4 image data stored in the frame memory 9 by using the reference picture element set by the reference picture element decision circuit 10, and outputs it as a signal 107 of first stage. Similarly, encoders 13 and 15 perform the encode of 1/2 image data and original image data stored in the frame memories 5 and 1, respectively, by using the reference picture elements set by the reference picture element decision circuits 12 and 14, respectively, and output them as a signal 108 of second stage and a signal 109 of third stage.

86. 发明专利

JPH02156773A PICTURE ENCODER 失效
公开(公告)号：JPH02156773A
公开(公告)日：1990-06-15
申请号：JP31169488
申请日：1988-12-08
申请人： CANON KK
发明人： YOSHIDA TADASHI , HIRABAYASHI KOJI , MAEDA MITSURU , KATAYAMA AKIHIRO
IPC分类号： H04N1/41 , G06T9/00
摘要： PURPOSE:To make the encoder small in size by providing a line memory with a minimum capacity for reduction to each stage being a half capacity or below and providing a frame memory only to an original sized picture without requiring a frame memory storing each processing state of picture. CONSTITUTION:The encoder is provided with a frame memory 1 storing an original sized picture, a picture reduction means 2 to produce each processing state of picture, line memories 4-6 storing the result of reduction of the picture reduction means 2 tentatively to generate the picture of the processing stage supplying the result to the picture reduction means 2 and an encoding means 8 encoding the processing state picture. Moreover, the line memories 4-6 respectively store several line of reduced pictures of 1/2, 1/4, 1/8. The reduction processing in the gradual encoding is applied in common to all stages. Thus, the encoder is made small in size.

87. 发明专利

JPH0257365A IMAGE PROCESSING SYSTEM 失效
公开(公告)号：JPH0257365A
公开(公告)日：1990-02-27
申请号：JP20827488
申请日：1988-08-24
申请人： CANON KK
发明人： KATAYAMA AKIHIRO , OSAWA HIDESHI
IPC分类号： B41J2/52 , G06T5/00 , H04N1/40 , H04N1/405
摘要： PURPOSE:To obtain a satisfactory image even in low or high density of an input image by distributing distributed value calculated by first calculating means by first distributing means to peripheral pixel position group of a pixel to be noted, calculating the error amount of the distributed value by second calculating means to be distributed by second distributing means. CONSTITUTION:When a pixel to be noted is input, error data of the density value of the pixel to be noted and data distributed before it are added, the density of the pixel to be noted of the added result ID is converted to binary value of '0' or '255'. Then, the added value ID of the pixel to be noted is subtracted from the binary data OD, the calculated distributed value [(ID - OD)/3] is distributed to pixel positions (i+1, j), (i, j+1), and [(ID - OD)/6] is distributed to the pixel positions (i-1, j+1), (i+1, j+1). When the distributed value is calculated, its integer number part is distributed to the corresponding four pixel positions of an image memory 15, but its fractional part is removed in the calculation of the distributed value. Accordingly, the total sum FD of the removed fractional parts is calculated, and irregular near pixel is distributed to the pixel to be noted.

88. 发明专利

JPH01286573A METHOD AND APPARATUS FOR PROCESSING PICTURE DATA 失效
公开(公告)号：JPH01286573A
公开(公告)日：1989-11-17
申请号：JP11483388
申请日：1988-05-13
申请人： CANON KK
发明人： OSAWA HIDESHI , KATAYAMA AKIHIRO
IPC分类号： H04N1/41 , G06T9/00 , H04N1/411
摘要： PURPOSE:To efficiently binarize and compress a picture data of a halftone by replacing the result of binarizing processing into a prediction value in a predetermined timing so as to apply binaryzing processing by the error scatter method, interleaving the predicted value at data transmission so as to reduce the data quantity and interpolating the data by the prediction value at the data reception conversely. CONSTITUTION:When a predicted value 108 of a noted picture element is outputted from a prediction table 14, the predicted value 108 from the prediction table 14 is outputted as a binarized signal as it is in the predetermined timing. Thus, the prescribed picture element is replaced into the predicted value 108, the error due to the replacement is processed by the error scattering method, the replaced data is interleaved for transmission or recording and the interleaved picture data is interpolated by the same prediction system at the reception or readout conversely. Thus, the picture data of halftone is binarized and compressed with high efficiency.

89. 发明专利

JPH01175367A IMAGE PROCESSOR 失效
公开(公告)号：JPH01175367A
公开(公告)日：1989-07-11
申请号：JP33497587
申请日：1987-12-28
申请人： CANON KK
发明人： KATAYAMA AKIHIRO , OSAWA HIDESHI
IPC分类号： H04N1/405 , G06T5/00 , H04N1/40 , H04N1/403
摘要： PURPOSE:To improve the definition of an image by forcibly making data it a part of which density is low zero based on the comparison result between binarizing processing by an error diffusion method and a prescribed threshold and suppressing the appearance of dots at the background of the character part and the white ground part. CONSTITUTION:Corrected data 100 is inputted to an adder 7. A weight coeffi cient specified by a weighting circuit 9 is repeatedly normalized and multiplied by an error preserved in an error buffer memory 10 to obtain the corresponding products, which are added and outputted as a signal 101. Besides, the corrected data 100 is inputted to a comparator 6 and the signal 101 is inputted to a selec tor 8 and makes output data 103 zero when the data 100 is below the threshold T1. As the result, the data at the part of which density is low is forcibly made to be zero. Next, the data of which error is corrected is made to be binarized data 104 by a binarizing circuit 11 and stored in an output buffer 13. Then, data 200 is outputted. Thus, the occurrence of the dot at the background of the character part and the white ground part can be prevented and the repro duced image having the high definition can be obtained.

90. 发明专利

JPH01174167A PICTURE PROCESSING METHOD 失效
公开(公告)号：JPH01174167A
公开(公告)日：1989-07-10
申请号：JP33497487
申请日：1987-12-28
申请人： CANON KK
发明人： KATAYAMA AKIHIRO
IPC分类号： H04N1/405 , G06T5/00 , G09G1/00 , G09G5/10 , H04N1/40
摘要： PURPOSE:To obtain a reproduced picture with high quality even to any picture by using error diffusion method after plural pseudo dots are formed in a prescribed area so as to apply binarizing processing. CONSTITUTION:A picture data read by an input sensor section 1 is given to a selector 6, an edge detection circuit 4 and a highlight detection circuit 5 via an A/D converter 2 and a correction circuit 3. The circuits 4, 5 detect the edge and highlight and only a data without edge but with highlight part is fed to a pre-processing circuit 7 by the selector 6. The circuit 7 applies pseudo dot processing and its output and the data sent directly from the selector 6 are given to a binarizing circuit 9 via a memory 8, where binarization is applied. In this case, since dot regularity is provided by the forming of pseudo dot, the granular noise occurred in the highlight part is reduced in case of binarization by the error diffusion method or the like.

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