公开(公告)号：US4503457A

公开(公告)日：1985-03-05

申请号：US248896

申请日：1981-03-30

申请人： Kunio Ikuta ,  Hitomi Atoji

发明人： Kunio Ikuta ,  Hitomi Atoji

IPC分类号： H04N1/60 ,  G03F3/00 ,  G03F3/08 ,  G03F3/10 ,  G03F5/00 ,  H04N1/405 ,  H04N1/46 ,  H04N1/54

CPC分类号： H04N1/46 ,  H04N1/54

摘要： A tint laying device for use in a picture reproducing machine, wherein a pickup head scans an original picture to pick up a picture signal and sends it to a color discriminator which discriminates a color in hue of the picture signal to output a discrimination signal to a halftone dot area rate controller, wherein the controller outputs a signal corresponding to a halftone dot area rate predetermined of a halftone dot to be recorded, per each color, to an exposure amount controller which varies the brightness corresponding to the halftone dot area rate depending on the signal output from the controller, and wherein an exposure head scans a recording film and records a reproduction picture thereon according to the halftone dot area rate in synchronization with the pickup head. This device is capable of performing an accurate and quick operation without any skill.

摘要翻译： 一种用于图像再现机器中的色彩铺设装置，其中拾取头扫描原始图像以拾取图像信号，并将其发送到鉴别图像信号的色调中的颜色的颜色鉴别器，以将辨别信号输出到 半色调点面积率控制器，其中控制器将每个颜色的预定要记录的半色调点的半色调点面积率的信号输出到曝光量控制器，该曝光量控制器根据根据 从控制器输出的信号，并且其中，曝光头扫描记录膜，并根据与拾取头同步的半色调点面积率在其上记录再现图像。 该设备无需任何技巧就能够进行精确而快速的操作。

公开(公告)号：US5455682A

公开(公告)日：1995-10-03

申请号：US92091

申请日：1993-07-16

申请人： Kunio Ikuta

发明人： Kunio Ikuta

IPC分类号： H04N1/405 ,  G03F5/22 ,  H04N1/46 ,  H04N1/52 ,  H04N1/60 ,  H04N1/21

CPC分类号： H04N1/52 ,  G03F5/22

摘要： The present invention produces a set of improved halftone images which effectively prevents occurrence of rosette moire. A plurality of parallelograms can be formed from three apexes consisting of an arbitrary first apex of a reference triangle RT1, a middle point of the side of the triangle facing to the first apex, and one of the other two apexes of the triangle. One of the parallelograms is selected as a unit area for one halftone dot. The unit area is virtually laid out repeatedly on an image plane, and one halftone dot is located with respect to each unit area. Each halftone dot can be located at the center of the unit area or at any desirable position in the unit area.

摘要翻译： 本发明产生一组改进的半色调图像，其有效地防止了玫瑰花纹莫尔迹的发生。 可以由三个顶点形成多个平行四边形，三个顶点由参考三角形RT1的任意第一顶点，三角形面向第一顶点的中点和三角形的另外两个顶点之一组成。 选择一个平行四边形作为一个半色调点的单位面积。 单位面积实际上在图像平面上布置，并且相对于每个单位区域设置一个半色调点。 每个半色调点可以位于单元区域的中心或单元区域中的任何期望位置。

公开(公告)号：US4825298A

公开(公告)日：1989-04-25

申请号：US196332

申请日：1988-05-18

申请人： Kunio Ikuta ,  Masayuki Murai

发明人： Kunio Ikuta ,  Masayuki Murai

IPC分类号： G03F5/00 ,  H04N1/405 ,  H04N1/23

CPC分类号： H04N1/4058

摘要： A film coordinate generator generates film coordinates (u, v), corresponding to the position of an exposure beam on a recording film which is detected by encorders, which is in turn supplied to a screen coodinate generator to be converted into virtual screen coordinates (x, y). A beam control signal generator receives the coordinates (x, y) and an image signal corresponding to the position of the exposure beam to output a beam control signal indicating lighting of the exposure beam when one of the coordinates (x, y) is in between upper and lower limit values, corresponding to the same, which are previously decided for each combination of the other of the coordinates (x, y) and the density value of the image signal.

公开(公告)号：US4977464A

公开(公告)日：1990-12-11

申请号：US432818

申请日：1989-11-07

申请人： Kunio Ikuta

发明人： Kunio Ikuta

IPC分类号： B41J2/525 ,  G03F5/00 ,  H04N1/405

CPC分类号： H04N1/4058

摘要： An image signal (PS) or a screen threshold value (D) is converted by a plurality of conversion functions (F.sub.i, G.sub.i, f.sub.i, g.sub.i). The number (N.sub.ST) of reference solid pixels, which should be exposed to attain a halftone area rate specified by a given image signal, is calculated for each quarter block (QB) which is a quarter of one unit block for one halftone dot. The numbers (N.sub.RS) of virtual solid pixels, which would be exposed if the converted image signal or the converted screen threshold value were used, are calculated concerning respective conversion functions for each quarter block. The number (N.sub.RS) of virtual solid pixels which is the closest to the number (N.sub.ST) of reference solid pixels is selected and the conversion function corresponding to the selected number (N.sub.RS) is also selected for each quarter block (QB). Photosensitive film is exposed on the basis of the converted image signal or the converted screen threshold value converted by the selected conversion function, whereby the halftone area rate specified by the given image signal is attained, and the line portion is prevented to be seen broken.

公开(公告)号：US4673971A

公开(公告)日：1987-06-16

申请号：US804931

申请日：1985-12-05

申请人： Kunio Ikuta ,  Katsunori Yamada

发明人： Kunio Ikuta ,  Katsunori Yamada

IPC分类号： G03F5/00 ,  H04N1/405 ,  H04N1/46

CPC分类号： H04N1/4058

摘要： In reproducing halftone dot images, the appearance of moire effect is suppressed by slightly and randomly disarranging the positions of halftone dots to be recorded from the normal position in each unit halftone dot area, or by slightly and randomly distorting the halftone dots.

摘要翻译： 在再现半色调点图像时，通过在每个单元半色调点区域中从正常位置稍微随机地排列要记录的半色调点的位置，或者通过稍微和随机地使半色调点变形来抑制莫尔效应的出现。

公开(公告)号：US5911009A

公开(公告)日：1999-06-08

申请号：US787587

申请日：1997-01-22

申请人： Kunio Ikuta

发明人： Kunio Ikuta

IPC分类号： G06T9/00 ,  H04N1/405

CPC分类号： G06T9/004 ,  H04N1/4053

摘要： Error data .SIGMA.e.sub.P accumulated for a target pixel of binary coding or pixel of interest P is read from an error memory (20) and inputted into an adder (22). The adder (22) adds the error data to multi-valued image data regarding the pixel of interest P, so as to correct the multi-valued image data. A comparator (24) compares the corrected multi-valued image data outputted from the adder (22) with a predetermined reference value and outputs binary image data based on a result of the comparison. A bit converter (28) converts the one-bit binary image data to 8-bit data. A subtracter (26) subtracts the binary-coded image data from the image data prior to binary coding to obtain an error `e`. An error distribution circuit (30) distributes the error `e` into pixels A, C, D, and E, where the pixels A, C, and D are respectively located on the immediate right of, immediately below, and on the lower left of the pixel of interest P and the pixel E is located on the immediate left of the pixel D. The error memory (20) adds distributed portions of the error e.sub.A, e.sub.C, e.sub.D, and e.sub.E to error data .SIGMA.e.sub.A, .SIGMA.e.sub.C, .SIGMA.e.sub.D, and .SIGMA.e.sub.E, so as to update the values of the error data .SIGMA.e.sub.A, .SIGMA.e.sub.C, .SIGMA.e.sub.D, and .SIGMA.e.sub.E. This method of distributing the error `e` into the above peripheral pixels enables multi-valued image data for the pixel of interest P having a relatively low tone value or a relatively high tone value to be binary coded without damaging the quality of picture.

摘要翻译： 对于二进制编码或感兴趣像素P的目标像素累积的误差数据SIGMA eP从错误存储器（20）读取并输入加法器（22）。 加法器（22）将误差数据与关于感兴趣像素P的多值图像数据相加，以便校正多值图像数据。 比较器（24）将从加法器（22）输出的经校正的多值图像数据与预定参考值进行比较，并且基于比较结果输出二进制图像数据。 位转换器（28）将一位二进制图像数据转换为8位数据。 减法器（26）在二进制编码之前从图像数据中减去二进制编码的图像数据以获得错误'e'。 误差分配电路（30）将误差'e'分配成像素A，C，D和E，其中像素A，C和D分别位于右下方和左下方的位置 并且像素E位于像素D的左侧。错误存储器（20）将错误eA，eC，eD和eE的分布部分添加到错误数据SIGMA eA，SIGMA eC， SIGMA eD和SIGMA eE，以便更新错误数据SIGMA eA，SIGMA eC，SIGMA eD和SIGMA eE的值。 将误差'e'分配到上述周边像素中的方法使得具有相对较低色调值或相对较高色调值的感兴趣P的多值图像数据被二进制编码，而不损害图像质量。

公开(公告)号：US5268772A

公开(公告)日：1993-12-07

申请号：US794270

申请日：1991-11-19

申请人： Kunio Ikuta

发明人： Kunio Ikuta

IPC分类号： G03F5/00 ,  B41J2/52 ,  H04N1/405 ,  H04N1/40

CPC分类号： H04N1/4058

摘要： Three or more conversion functions are prepared. Only a part of the conversion functions are extracted therefrom to specify provisional conversion functions. A reference solid-pixel number and imaginary solid-pixel numbers for each provisional conversion function are computed through an imaginary exposure for a quarter halftone-dot block on a scanning line. The imaginary solid-pixel numbers are computed in response to new image signals which are obtained by converting an image signal through the respective provisional conversion functions. Then, each of the imaginary solid-pixel numbers is compared with the reference solid-pixel number, thereby a most-approximate conversion function, which gives a solid-pixel number most approximate to the reference solid-pixel number, is selected among the conversion functions. An exposure control signal is generated by comparing an image signal which is obtained by converting the image signal through the most-approximate conversion function with a corresponding screen threshold value.

公开(公告)号：US4692879A

公开(公告)日：1987-09-08

申请号：US698522

申请日：1985-02-05

申请人： Kunio Ikuta

发明人： Kunio Ikuta

IPC分类号： H04N1/405 ,  H04N1/46 ,  H04N1/52 ,  H04N1/40

CPC分类号： H04N1/4058

摘要： Halftone dots are formed pixel by pixel onto a photosensitive film of a size P.times.P in an improved manner by using a screen memory storing thresholds, each of which corresponds to each of m.times.n sub-cells of a halftone dot area of the size S.times.S. In accordance with the invention, four table memories are prepared by respectively storing values ##EQU1## with y.sub.n being the main scanning direction addresses and x.sub.n being the sub-scanning direction addresses. Values read from the first table memory and values read from the second table memory are summed to obtain the sub-scanning reading addresses of the screen memory, while the values read from the third table memory and the values read from the fourth table memory are summed to form the main scanning reading addresses of the screen memory. At this junction, the values (1) to (4) to be stored in each of the table memories are permitted to be residues, taking advantage of the characteristic that the values are periodic. Additionally, the memory capacity required for the operation can be permitted to be smaller by taking advantage of the characteristic that the values of interest form an arithmetic series.

摘要翻译： 通过使用存储阈值的屏幕存储器，以改善的方式将半色调点逐像素地形成在尺寸为PxP的感光膜上，每个屏幕存储器对应于尺寸为SxS的半色调点区域的每个m×n个子单元。 根据本发明，通过分别存储值（1）-yn×P×sinθ，＆lt; IMAGE＆gt;＆lt; IMAGE＆gt;，其中yn为主扫描方向地址，xn为副扫描 方向地址。 将从第一表存储器读取的值和从第二表存储器读取的值相加以获得屏幕存储器的子扫描读取地址，而从第三表存储器读取的值和从第四表存储器读取的值相加 以形成屏幕存储器的主扫描读取地址。 在该结处，利用值为周期性的特征，允许存储在每个表存储器中的值（1）至（4）为残差。 此外，通过利用感兴趣的值形成算术序列的特性，可以允许操作所需的存储器容量更小。