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公开(公告)号:JPS59163963A
公开(公告)日:1984-09-17
申请号:JP3769683
申请日:1983-03-08
Applicant: Canon Inc
Inventor: SASAKI TAKU , SAKURADA NOBUAKI , KAWAMURA HIDEAKI , MORIYAMA JIROU
CPC classification number: B41M1/18 , H04N1/50 , H04N1/6022
Abstract: PURPOSE:To express smoothly a shadow part by comparing a black density obtained from cyan, magenta and yellow with a prescribed threshold value change over at random a black colorant and three color colorants. CONSTITUTION:R, G, B color signals are converted into yellow Y, magenta M and cyan C color signals at a converting circuit 21 of an ink jet printer, and this color signals are inputted to a black color generating circuit 22, where a black component BK is extracted. The black component BK is compared with threshold values L1, L2 at a comparator 23, and when the relation of L2
Abstract translation: 目的:通过将从青色,品红色和黄色获得的黑色浓度与规定的阈值进行比较,通过随机改变黑色着色剂和三色着色剂来平滑地表达阴影部分。 构成:在喷墨打印机的转换电路21,将R,G,B彩色信号转换为黄色Y,品红色M和青色C色信号,并将该彩色信号输入黑色发生电路22, 提取组分BK。 比较器23将黑色分量BK与阈值L1,L2进行比较,当存在L2
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公开(公告)号:JPS59163955A
公开(公告)日:1984-09-17
申请号:JP3769983
申请日:1983-03-08
Applicant: Canon Inc
Inventor: MORIYAMA JIROU , SAKURADA NOBUAKI , SASAKI TAKU , KAWAMURA HIDEAKI
CPC classification number: B41M1/18 , H04N1/50 , H04N1/6022
Abstract: PURPOSE:To obtain a picture with high quality by setting a maximum OD value expressed in black ink higher than a maximum OD value expressed in cyan, magenta, and yellow ink to improve the contrast of the entire picture. CONSTITUTION:Digitized signals and separated into R, G, B three colors from an input picture signal are processed at a YMC converting circuit 21, gamma correcting circuit 22, and a masking circuit 23 of a picture processing circuit, yellow Y, magenta M and cyan C complementary signals are generated and inputted respectively to a background color eliminating circuit 24 and a selecting device 26. A black BK signal generated from the circuit 24 is compared with a threshold value Vth at a comparator 25, and when the signal BK is smaller than the Vth, the selector 26 selects the Y, M, C signals from the circuit 23 and no BM ink is printed. When the BK signal from the circuit 24 is higher than the Vth, a signal is outputted from the comparator 25, the selector 26 selects the output of the circuit 24 and the BK ink is printed.
Abstract translation: 目的:为了获得高质量的图像,通过设置表示为以青色,品红色和黄色墨水表示的最大OD值以上的黑色墨水表示的最大OD值,以提高整个图像的对比度。 构成:从输入图像信号分离为R,G,B三种颜色的数字信号在YMC转换电路21,伽马校正电路22和图像处理电路的屏蔽电路23处被处理,黄色Y,品红色M和 青色C互补信号分别产生并输入到背景色消除电路24和选择装置26.从电路24产生的黑色BK信号与比较器25的阈值Vth进行比较,当信号BK较小时 选择器26选择来自电路23的Y,M,C信号,并且不打印BM墨水。 当来自电路24的BK信号高于Vth时,从比较器25输出信号,选择器26选择电路24的输出并打印BK墨。
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公开(公告)号:JPS59163954A
公开(公告)日:1984-09-17
申请号:JP3769783
申请日:1983-03-08
Applicant: Canon Inc
Inventor: SASAKI TAKU , SAKURADA NOBUAKI , KAWAMURA HIDEAKI , MORIYAMA JIROU
CPC classification number: H04N1/50 , B41M1/18 , H04N1/6022
Abstract: PURPOSE:To attain the formation of a picture excellent in quality sence even on a high density part by detecting a black density component from an input picture data and generating the high and low density balck levels in a prescribed rate even when the black density component is prescribed value or over. CONSTITUTION:A composite video signal including each color signal of R, G, B and a synchronizing signal is led to an AD converting circuit 2 via an interface 1, a gradation signal of the picture signals R, G, B is converted into a digital signal at the circuit 2, and the number of lines is stored in a line memory 3. A data in the memory 3 is processed for processings such as color conversion, gamma conversion, masking processing and background color elmination or the like at each picture element at a picture processing circuit 4, converted into cyan, magenta, yellow and black signals, and further converted into an application voltage to each head and inputted to a head driver 6. In this case, the circuit 4 detects the black density component and when the detected value is larger than a prescribed value, the high and low density levels of a black colored member are generated at a prescribed rate, allowing to form a picture having good quality sense even with a high density component.
Abstract translation: 目的:通过从输入图像数据检测黑色浓度分量,即使在黑色密度分量为 规定值或以上。 构成:将包含R,G,B的每个颜色信号和同步信号的复合视频信号通过接口1引导到AD转换电路2,将图像信号R,G,B的灰度信号转换为数字 信号,并且行数存储在行存储器3中。存储器3中的数据被处理用于诸如颜色转换,伽马转换,掩蔽处理和每个像素处的背景色彩校准等处理 在图像处理电路4中,转换为青色,品红色,黄色和黑色信号,并进一步转换为每个头部的施加电压并输入到头驱动器6.在这种情况下,电路4检测黑色密度分量,何时 检测值大于规定值时,以规定的速度生成黑色构件的高低密度水平,能够即使以高密度成分形成具有良好品质感的图像。
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