公开(公告)号：US6137593A

公开(公告)日：2000-10-24

申请号：US012091

申请日：1998-01-22

Applicant: Vadlamannati Venkateswar ,  Vivek Kumar Thakur

Inventor： Vadlamannati Venkateswar ,  Vivek Kumar Thakur

IPC: B41J2/44 ,  B41J2/45 ,  B41J2/455 ,  G02B26/08 ,  G06K15/10 ,  G06K15/12 ,  H04N1/40 ,  G06F15/00

CPC classification number: G06K15/1242 ,  G06K15/10 ,  G06K15/1252 ,  G06K2215/111

Abstract: The present invention provides a method of ameliorating the effects of misalignment between modulator arrays, and a system using the same. The ability reduce the effects of misalignment allows multiple, smaller, more cost effective arrays to be used instead of one large array. This can reduce the manufacturing costs of the array, especially arrays that are produced using semiconductor manufacturing processes such as the digital micromirror device. To avoid visual artifacts caused by the misalignment of two or more modulator arrays 1702, 1704, the individual arrays 1702, 1704 are optically overlapped and a portion of the image 1706 is generated by both arrays 1702, 1704. A breakpoint is chosen between two pixels in the overlapped region 1706 at which to abut the images from each of the modulator arrays 1702, 1704. The breakpoint is changed each row of pixels to minimize the detectability of any visual artifact caused by misalignment between the modulator arrays 1702, 1704.

Abstract translation: 本发明提供一种改善调制器阵列之间的未对准的效果的方法和使用其的系统。 降低失准影响的能力允许使用多个，更小，更具成本效益的阵列而不是一个大阵列。 这可以降低阵列的制造成本，特别是使用诸如数字微镜器件的半导体制造工艺生产的阵列。 为了避免由两个或更多个调制器阵列1702,1704的未对准引起的视觉伪像，各个阵列1702,1704被光学重叠，并且图像1706的一部分由阵列1702,1704产生。在两个像素之间选择断点 在重叠区域1706中，其邻接来自每个调制器阵列1702,1704的图像。每个像素点改变断点，以最小化由调制器阵列1702,1704之间的未对准引起的任何视觉伪影的可检测性。

公开(公告)号：US6074790A

公开(公告)日：2000-06-13

申请号：US340958

申请日：1994-11-17

Applicant: Vadlamannati Venkateswar ,  Vivek Kumar Thakur

Inventor： Vadlamannati Venkateswar ,  Vivek Kumar Thakur

IPC: B41J2/445 ,  G02B26/08 ,  G06K15/12 ,  H04N1/191 ,  H04N1/401 ,  G06K9/40

CPC classification number: H04N1/4015 ,  G06K15/1257 ,  H04N1/191

Abstract: A method for defect-correction printing. A spatial light modulator that is used to generate the image is mapped for defects. The ON defects are compensated by setting a background level that is equal to the cumulative exposure of the ON defects, and then this background level becomes the threshold for development by the electrophotographic process. The system compensates for OFF defects by allocating the bits and exposures necessary to approximate the OFF defects to operative elements, thereby keeping the cumulative exposure for that pixel in the final printed image exactly, or as closely as possible, equal to the desired exposure. The corrections are contained in a defect correction module (10) that generates the appropriate patterns with the correct allocations to minimize error.

Abstract translation: 一种缺陷校正打印的方法。 用于产生图像的空间光调制器被映射为缺陷。 通过设置等于ON缺陷的累积曝光的背景水平来补偿ON缺陷，然后该背景水平成为通过电子照相方法显影的阈值。 该系统通过分配必要的位和曝光来补偿OFF缺陷，以将OFF缺陷近似为操作元件，从而将最终打印图像中该像素的累积曝光准确地或尽可能接近地保持等于期望的曝光。 校正被包含在缺陷校正模块（10）中，该模块生成具有正确分配的适当模式以使误差最小化。

公开(公告)号：US06731406B1

公开(公告)日：2004-05-04

申请号：US09397213

申请日：1999-09-16

Applicant: Praveen K. Ganapathy ,  Subramanian Ravi ,  Vivek Kumar Thakur ,  Ramachandran Srinivasan

Inventor： Praveen K. Ganapathy ,  Subramanian Ravi ,  Vivek Kumar Thakur ,  Ramachandran Srinivasan

IPC: H04N140

CPC classification number: H04N1/4055

Abstract: This invention involves approximating a gray scale tone with a more limited range image producer, a process known as screening. This invention reduces the time needed for such screening by discriminating when screening is not needed. In a first embodiment, the rendering process produces a minimally enclosing bounding box surrounding all rendered objects. In an alternative embodiment, scan lines including any part of a rendered object are noted. The screening makes better use of memory by dividing each row of a preference matrix into segments. The lookup tables associated with these segments are sequentially loaded into a memory cache. Input pixels mapping into the loaded segment lookup tables are screened. Then the lookup table associated with the next segment of the preference matrix are loaded into the memory cache and used to screen input pixels mapping into that segment. The method of packs two output pixels into a single data word while multi-level screening even when the preference matrix has an odd row length by alternating consideration of M−1 input pixels and M+1 input pixels, where M is the row length.

Abstract translation: 本发明涉及用更有限的范围图像生成器近似灰度色调，称为筛选的过程。 本发明通过区分何时不需要筛选来减少这种筛选所需的时间。 在第一实施例中，渲染过程产生围绕所有渲染对象的最小包围边界框。 在替代实施例中，记录包括渲染对象的任何部分的扫描线。 筛选通过将偏好矩阵的每一行划分成段来更好地利用存储器。 与这些段相关联的查找表被顺序地加载到存储器高速缓存中。 将映射到加载段查找表的输入像素进行筛选。 然后将与偏好矩阵的下一个段相关联的查找表加载到存储器高速缓存中，并用于屏蔽映射到该段中的输入像素。 即使通过交替考虑M-1个输入像素和M + 1个输入像素（即行长度），偏好矩阵具有奇数行长度，也可以将多个电平屏蔽的两个输出像素分组成单个数据字。

公开(公告)号：US06983298B2

公开(公告)日：2006-01-03

申请号：US10077230

申请日：2002-02-15

Applicant: Vivek Kumar Thakur

Inventor： Vivek Kumar Thakur

IPC: G06F7/38

CPC classification number: G06F1/0356 ,  G06F17/17

Abstract: This invention is a method and apparatus for interpolation which enables simpler and cost efficient implementation in hardware or software. A function table stores values of the function at addresses corresponding to the argument points where the function is known. The input value enables identification of the function values for arguments immediately below and above the input value. Respective bits of the absolute value of the difference between these two function values enables corresponding gradient value tables. A set of gradient values are stored in these gradient value tables. The least significant bits of the input value, those bits less significant than the arguments of the stored function values, address entries in the enabled gradient value tables. The desired interpolation value is the sum of the first function value and the gradient value recalled from the gradient tables.

公开(公告)号：US06950201B2

公开(公告)日：2005-09-27

申请号：US09783889

申请日：2001-02-14

Applicant: Srinivasan Ramachandran ,  Praveen Kademada Ganapathy ,  Vivek Kumar Thakur

Inventor： Srinivasan Ramachandran ,  Praveen Kademada Ganapathy ,  Vivek Kumar Thakur

IPC: G06F3/12 ,  G06T11/20 ,  G06F13/00

CPC classification number: G06T11/203 ,  G06F3/1211 ,  G06F3/126 ,  G06F3/1284 ,  G06F3/1285

Abstract: A raster image processing system which supports multiple rendering/screening approaches, and selects an optimal approach suited for the specific images to be generated. In an embodiment, images may be rendered using either back-end screening approach or pipelined screening approach. Several variables may be measured to determine which one of the two consumes minimal time for a specific image to be rendered, and the approach consuming minimal time is selected. Typically, back-end screening is selected when multiple overlapping objects are present, and pipelined screening is selected otherwise.

Abstract translation: 一种支持多种渲染/筛选方法的光栅图像处理系统，并且选择适合于要生成的特定图像的最佳方法。 在一个实施例中，可以使用后端筛选方法或流水线筛选方法来呈现图像。 可以测量几个变量以确定两个中的哪个消耗了要渲染特定图像的最小时间，并且选择消耗最少时间的方法。 通常，当存在多个重叠对象时选择后端筛选，否则选择流水线筛选。

公开(公告)号：US07009736B2

公开(公告)日：2006-03-07

申请号：US09998784

申请日：2001-12-03

Applicant: Vivek Kumar Thakur

Inventor： Vivek Kumar Thakur

IPC: H04N1/405

CPC classification number: H04N1/4058 ,  H04N1/40087

Abstract: This invention is a screening method. The input image is divided into a plurality of supercells. These supercells are divided into a plurality of individual cells. An expanded cell is defined larger than each of the individual cells. A map of an input gray scale tone to an output gray scale tone is defined for each pixel of the expanded cell. The screening takes place for each pixel of the input image. First the method determines a pixel of the expanded cell corresponding to the input pixel. Then the output gray scale tone corresponding to the pixel of the expanded cell is recalled.

公开(公告)号：US06934417B2

公开(公告)日：2005-08-23

申请号：US09998233

申请日：2001-12-03

Applicant: Venkat V. Easwar ,  Vivek Kumar Thakur

Inventor： Venkat V. Easwar ,  Vivek Kumar Thakur

IPC: G06F3/12 ,  G06T3/00 ,  G06T9/00 ,  H04N1/41 ,  H04N7/26 ,  H04N7/30 ,  H04N7/34 ,  G06K9/46

CPC classification number: G06T9/007 ,  G06T3/0006 ,  H04N19/13 ,  H04N19/136 ,  H04N19/18 ,  H04N19/40 ,  H04N19/593 ,  H04N19/60

Abstract: This invention proposes to transcode the compressed image, that may be in the JPEG format for example, to an intermediate format that allows pseudo-random access. Such a pseudo-random access would that allow efficient image transformation. By using this format, in most cases a pixel is decoded only once in the entire image transformation process. This is certainly true for the most common transformation operations such as rotation by 90, 180 and 270 degrees. This transcoding would enable image transformations in printers whose memory is insufficient to store the entire decompressed image.

Abstract translation: 本发明提出将可能以JPEG格式的压缩图像转码为允许伪随机访问的中间格式。 这样的伪随机访问将允许有效的图像变换。 通过使用这种格式，在大多数情况下，像素在整个图像变换过程中仅被解码一次。 对于最常见的转换操作（例如旋转90度，180度和270度）这一点是肯定的。 这种代码转换将使得内存不足以存储整个解压缩图像的打印机中的图像转换。