公开(公告)号：US06829063B1

公开(公告)日：2004-12-07

申请号：US09594235

申请日：2000-06-14

申请人： Jan P. Allebach ,  Qian Lin

发明人： Jan P. Allebach ,  Qian Lin

IPC分类号： G06K1500

CPC分类号： H04N1/4051 ,  H04N1/52

摘要： A method and system for jointly designing at least two sets of dither matrices. First, a mosaic color tile is generated for a first concentration level according to a design tile map. The mosaic color tile includes at least a first color tile and a second color tile where each color tile has a color tile concentration level (CTCL) and a color tile number (CTN). Second, a color fluctuation metric is performed on the mosaic color tile. Next, the pixels in the first color tile are modified by an operation (e.g., a swap operation) while maintaining the first concentration level. Then, a color fluctuation metric is re-calculated on the mosaic color tile with all first color tiles being replaced with the modified first color tile (i.e., everywhere the first color tile appears in the mosaic color tile as specified by the design tile map). Performing the step of modifying the color tiles and re-calculating the color fluctuation metric for the modified mosaic tile until the metric is below a predetermined metric level.

摘要翻译： 一种用于共同设计至少两组抖动矩阵的方法和系统。 首先，根据设计瓦片图，为第一浓度水平生成马赛克彩色瓦片。 马赛克彩色瓦片包括至少第一颜色瓦片和第二彩色瓦片，其中每个彩色瓦片具有彩色瓦片浓度水平（CTCL）和彩色瓦片数量（CTN）。 其次，对马赛克彩色瓦片进行色彩波动度量。 接下来，通过在保持第一浓度水平的同时进行操作（例如，交换操作）修改第一颜色图块中的像素。 然后，在马赛克彩色瓦片上重新计算颜色波动度量，所有第一颜色瓦片被修改的第一颜色瓦片（即，第一颜色瓦片出现在由设计瓦片贴图指定的马赛克颜色瓦片中的任何位置） 。 执行修改颜色图块并重新计算修改的马赛克图块的颜色波动度量的步骤，直到该度量低于预定的度量水平。

公开(公告)号：US06600573B2

公开(公告)日：2003-07-29

申请号：US09144724

申请日：1998-09-01

申请人： Doran Shaked ,  Izhak Baharav ,  Qian Lin

发明人： Doran Shaked ,  Izhak Baharav ,  Qian Lin

IPC分类号： H04N146

CPC分类号： H04N1/52

摘要： A color image is converted into a dot pattern for display by a color printer. The image is separated into Cyan, Magenta and Yellow color planes; a dither matrix is applied to the Cyan plane; an inverse of the dither matrix is applied to the Magenta plane; and either the dither matrix or the inverse dither matrix is applied to the Yellow plane.

摘要翻译： 彩色图像被转换为​​彩色打印机显示的点阵图形。 图像分为青色，品红色和黄色色彩; 将抖动矩阵应用于青色平面; 将抖动矩阵的倒数应用于品红色平面; 并且将抖动矩阵或反向抖动矩阵应用于黄色平面。

公开(公告)号：US06204940B1

公开(公告)日：2001-03-20

申请号：US09080054

申请日：1998-05-15

申请人： Qian Lin ,  Malcolm Rix ,  Daniel R. Tretter ,  Michael Stokes

发明人： Qian Lin ,  Malcolm Rix ,  Daniel R. Tretter ,  Michael Stokes

IPC分类号： G03F310

CPC分类号： H04N1/4072 ,  H04N1/407 ,  H04N1/6027 ,  H04N9/11

摘要： A process and apparatus is described to improve the digital processing of scanned negative films by reducing the amount of time necessary to perform the process and by increasing the robustness and quality of the images produced. These benefits are achieved by a process of color inversion, white point and black point mapping, and midtone adjustment. White and black mapping increases the dynamic range of the image, as well as removes the color cast of the negative film. A backlit image postprocessing algorithm can be employed which uses heuristics to identify backlighted situations, which are then brightened using a nonlinear power mapping. A midtone adjustment can include the sub-steps of contrast reduction and color adjustment. Contrast reduction reverses the film exposure characteristics. Color adjustment removes the remaining color cast in the midtone region of the image, and obtains the correct brightness. Starting from images with poor contrast and color cast, the system automatically looks for the appropriate correction parameters to produce images with vivid color and good contrast. This is achieved without rescanning or retaking the picture. One implementation, using one dimensional look-up-tables, is very efficient.

摘要翻译： 描述了一种处理和装置，以通过减少执行该过程所需的时间量以及增加产生的图像的鲁棒性和质量来改进扫描的底片的数字处理。 这些优点通过颜色反转，白点和黑点映射以及中间调节调整来实现。 白色和黑色的绘制增加了图像的动态范围，并且消除了底片的色偏。 可以使用背光图像后处理算法，其使用启发式来识别背光状态，然后使用非线性功率映射来增亮。 中间调节可以包括对比度降低和颜色调整的子步骤。 对比度降低反转胶片曝光特性。 颜色调整可以删除图像中间色调区域中的剩余颜色，并获得正确的亮度。 从对比度和色彩差的图像开始，系统会自动寻找适当的校正参数，以生成鲜艳色彩和良好对比度的图像。 这是在不重新扫描或重新拍摄照片的情况下实现的。 使用一维查找表的一个实现是非常有效的。

公开(公告)号：US5689586A

公开(公告)日：1997-11-18

申请号：US502269

申请日：1995-07-13

申请人： Qian Lin

发明人： Qian Lin

IPC分类号： B41J2/52 ,  G06F3/12 ,  G06T5/00 ,  H04N1/40 ,  H04N1/405 ,  G06K9/36

CPC分类号： H04N1/4055 ,  H04N1/40087 ,  H04N1/4057

摘要： Generating a N-tone image from a grey scale image with a number of multi-level dither matrices. Both images have many pixels, with each pixel in the grey scale image having a grey level that is within a maximum and a minimum levels, and with each pixel in the N-tone image having a level that is one of N levels with N bigger than two. The method includes the step of determining the level of each pixel in the N-tone image based on the levels of its corresponding pixel in the grey scale image, and an original dither matrix, the separations between adjacent levels in the N levels are not uniform. After the determination process, every pixel in the N-tone image is modelled to represent its level. Based on the modelling, the N-tone image is printed.

摘要翻译： 从具有多级抖动矩阵的灰度图像生成N色调图像。 两个图像具有许多像素，灰度图像中的每个像素具有在最大和最小水平内的灰度级，并且N色调图像中的每个像素具有N级的N级之一 比两个。 该方法包括基于灰度图像中其对应像素的电平和原始抖动矩阵来确定N色调图像中的每个像素的电平的步骤，N个电平中相邻电平之间的间隔不均匀 。 在确定过程之后，N色调图像中的每个像素被建模以表示其水平。 基于建模，打印出N色图像。

公开(公告)号：US5615021A

公开(公告)日：1997-03-25

申请号：US459143

申请日：1995-06-02

申请人： Qian Lin

发明人： Qian Lin

IPC分类号： B41J2/52 ,  G06F3/12 ,  G06K3/00 ,  G06K15/00 ,  G06K15/02 ,  G06K15/10 ,  H04N1/40 ,  H04N1/405

CPC分类号： H04N1/4055 ,  H04N1/4057

摘要： Generating a N-tone image relatively inexpensively with substantially imperceptible dots. The method generates the N-tone image from a grey scale image, both images have many pixels, with each pixel in the grey scale image having a grey level that is within a maximum and a minimum level, and with each pixel in the N-tone image having a level that is one of N levels with N bigger than two and less than the number of levels available for the grey scale image. The method includes the steps of determining the level of each pixel in the N-tone image based on the levels of its corresponding pixel in the grey scale image, and based on either an original dither matrix or an error diffusion technique. Each pixel is modelled by a number of sub-pixels, and each sub-pixel is modelled by a number of segments. Each segment has an intensity whose value depends on its corresponding pixel. The different intensities of the segments when combined together generate N substantially reproducible levels for the N-tone image. Based on the modelling step, the N-tone image is generated with substantially imperceptible dots.

摘要翻译： 用基本上不可察觉的点相对便宜地生成N色调图像。 该方法从灰度图像生成N色调图像，两个图像具有许多像素，灰度图像中的每个像素具有在最大和最小水平内的灰度级，并且每个像素在N- 具有N级大于2并且小于可用于灰度图像的级数的N级的音调图像。 该方法包括以下步骤：基于灰度图像中其对应像素的电平，并且基于原始抖动矩阵或误差扩散技术来确定N色调图像中的每个像素的电平。 每个像素由多个子像素建模，并且每个子像素由多个片段建模。 每个段具有其值取决于其相应像素的强度。 当组合时，段的不同强度为N色调图像产生N个基本上可再现的电平。 基于建模步骤，产生具有基本上不可察觉的点的N色调图像。

公开(公告)号：US5469515A

公开(公告)日：1995-11-21

申请号：US57244

申请日：1993-05-03

申请人： Qian Lin

发明人： Qian Lin

IPC分类号： B41J2/52 ,  G06T5/00 ,  H04N1/405 ,  G06K9/38

CPC分类号： H04N1/4051

摘要： A method of generating a halftone image on a printer from a grey scale image using a dither matrix. The halftone image is represented by symbols when it is printed out by the printer. The matrix includes many patterns. Each pattern has many elements having values with a different number of ones and zeros. The values of the elements in each pattern depend on a model of the symbols. The model is incorporated into the patterns as each pattern is generated.

摘要翻译： 一种使用抖动矩阵从灰度图像在打印机上产生半色调图像的方法。 当由打印机打印时，半色调图像由符号表示。 矩阵包括许多模式。 每个模式都有许多元素具有不同数量的1和0的值。 每个模式中的元素的值取决于符号的模型。 每个模式都被生成，该模型被并入到模式中。