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

IPC: G03G15/01 ,  B41J2/49 ,  B41M1/18 ,  G03F3/08 ,  H04N1/46 ,  H04N1/50 ,  H04N1/52 ,  H04N1/60

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

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

IPC: G03G15/01 ,  B41J2/21 ,  B41J2/525 ,  B41M1/18 ,  G03F3/08 ,  H04N1/50 ,  H04N1/60

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。

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

IPC: G03G15/01 ,  B41J2/21 ,  B41J2/525 ,  B41M1/18 ,  G03F3/08 ,  H04N1/50 ,  H04N1/60

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。