公开(公告)号：US20050286794A1

公开(公告)日：2005-12-29

申请号：US10876039

申请日：2004-06-24

申请人： Ralph Brunner ,  Kok Chen ,  John Harper

发明人： Ralph Brunner ,  Kok Chen ,  John Harper

IPC分类号： G06K9/32 ,  G06K9/40 ,  G06T5/00

CPC分类号： G06T5/002 ,  G06T5/20

摘要： A Gaussian blur approximation is applied to an image by repeated down-sampling operations followed by an up-sample operation. By using a truncated Gaussian filter as the down-sample filter, the frequency spectrum removed during down-sampling operations closely approximates the frequency spectrum lost during a true Gaussian blur operation. While any “good” up-sample filter may be used, up-sampling via linear interpolation may be especially beneficial in systems having a dedicated graphics processing unit. One benefit of the described technique is that it is computationally less costly to implement than a Gaussian blur. Another benefit is that this computational benefit increases as the size of the blur increases—becoming significant even for small blurs. Yet another benefit of the invention is that a judicious selection of pixel address to convolve with the filter leads to substantially reduced number of texture lookups required to effect a convolution.

摘要翻译： 高斯模糊近似通过重复的下采样操作随后进行上采样操作来应用于图像。 通过使用截断高斯滤波器作为下采样滤波器，在下采样操作期间去除的频谱与真正的高斯模糊操作期间的频谱损失密切相近。 虽然可以使用任何“良好”的抽样滤波器，但通过线性插值的上采样在具有专用图形处理单元的系统中尤其有利。 所描述的技术的一个好处是，与高斯模糊相比，在计算上成本较低。 另一个好处是，随着模糊大小的增加，这种计算效益即使对于小的模糊也变得显着。 本发明的另一个好处是，与滤波器卷积的像素地址的明智选择导致实现卷积所需的纹理查找的数量大大减少。

公开(公告)号：US07397964B2

公开(公告)日：2008-07-08

申请号：US10876039

申请日：2004-06-24

申请人： Ralph Brunner ,  Kok Chen ,  John Harper

发明人： Ralph Brunner ,  Kok Chen ,  John Harper

IPC分类号： G06K9/40

CPC分类号： G06T5/002 ,  G06T5/20

摘要： A Gaussian blur approximation is applied to an image by repeated down-sampling operations followed by an up-sample operation. By using a truncated Gaussian filter as the down-sample filter, the frequency spectrum removed during down-sampling operations closely approximates the frequency spectrum lost during a true Gaussian blur operation. While any “good” up-sample filter may be used, up-sampling via linear interpolation may be especially beneficial in systems having a dedicated graphics processing unit. One benefit of the described technique is that it is computationally less costly to implement than a Gaussian blur. Another benefit is that this computational benefit increases as the size of the blur increases—becoming significant even for small blurs. Yet another benefit of the invention is that a judicious selection of pixel address to convolve with the filter leads to substantially reduced number of texture lookups required to effect a convolution.

摘要翻译： 高斯模糊近似通过重复的下采样操作随后进行上采样操作来应用于图像。 通过使用截断高斯滤波器作为下采样滤波器，在下采样操作期间去除的频谱与真正的高斯模糊操作期间的频谱损失密切相近。 虽然可以使用任何“良好”的抽样滤波器，但通过线性插值的上采样在具有专用图形处理单元的系统中尤其有利。 所描述的技术的一个好处是，与高斯模糊相比，在计算上成本较低。 另一个好处是，随着模糊大小的增加，这种计算效益即使对于小的模糊也变得显着。 本发明的另一个好处是，与滤波器卷积的像素地址的明智选择导致实现卷积所需的纹理查找的数量大大减少。

公开(公告)号：US08452090B1

公开(公告)日：2013-05-28

申请号：US11113656

申请日：2005-04-25

申请人： Ralph Brunner ,  Mark Zimmer ,  Kok Chen

发明人： Ralph Brunner ,  Mark Zimmer ,  Kok Chen

IPC分类号： G06K9/00

CPC分类号： G06K9/00 ,  G06T3/4015 ,  H04N1/46 ,  H04N9/00 ,  H04N9/045 ,  H04N2209/046

摘要： A system and method for performing Bayer reconstruction of images using a programmable graphics processing unit (GPU) are described herein. A Bayer filtered image in RAW format is uploaded to the GPU, unpacked, and reconstructed. Optionally, the reconstructed image may be transformed into any desired color space and/or displayed by a video card in which the GPU resides. The reconstruction is performed independently on each of the red, blue, and green image fields. The red and blue image fields are reconstructed using first and second interpolation passes in first and second orthogonal directions. Each reconstruction pass preferably employs a two-lobed Lanczos filter. The green image field is interpolated using a single interpolation pass in a direction diagonal to the first and second orthogonal directions, and preferably employs a box filter.

摘要翻译： 本文描述了使用可编程图形处理单元（GPU）执行图像的拜耳重建的系统和方法。 以RAW格式将拜耳过滤的图像上传到GPU，解压缩并重建。 可选地，重建图像可以被转换成任何期望的颜色空间和/或由GPU所在的视频卡显示。 在红色，蓝色和绿色图像场中的每一个上独立地执行重建。 使用第一和第二正交方向上的第一和第二插值遍重建红色和蓝色图像场。 每个重建通道优选采用双裂片Lanczos滤波器。 绿色图像场在与第一和第二正交方向对角的方向上使用单个插值遍进进行内插，并且优选地采用盒式滤波器。

公开(公告)号：US20110249141A1

公开(公告)日：2011-10-13

申请号：US13167642

申请日：2011-06-23

申请人： Kok Chen ,  Gabriel G. Marcu ,  Wei Chen ,  John Z.Z. Zhong

发明人： Kok Chen ,  Gabriel G. Marcu ,  Wei Chen ,  John Z.Z. Zhong

IPC分类号： H04N9/73

CPC分类号： H04N5/58 ,  H04N9/68 ,  H04N21/42202 ,  H04N21/44 ,  H04N21/4854

摘要： Methods and apparatuses for color correction of color device for various operating conditions. In at least one embodiment of the present invention, operating under a current condition, a color correction operation that is derived from color correction operations defined for other conditions is performed on the color data. In another embodiment, a device profile for managing colors for a color device operating under one condition is interpolated from the device profiles for the color device operating under other conditions (e.g., based on the input received from a user interface according to the perception of the user or based on the measurement of a sensor). The interpolation can be based on the input received from a user interface according to the perception of the user or it can be based on the measurement of a sensor or a set of sensors. Various operating conditions for a color device (e.g., a scanner, a camera, a video camera, a printer, a display device such as a CRT monitor or an LCD display panel, a television set, or others) include chromaticity and illumination of ambient light, background color for a display device, characteristics of print media for a printer, humidity, temperature, pressure and ink level for an ink jet printer, the age of a light source for a scanner, and others.

摘要翻译： 用于各种操作条件的彩色装置的颜色校正方法和装置。 在本发明的至少一个实施例中，在当前条件下操作，对颜色数据执行从为其他条件定义的颜色校正操作导出的颜色校正操作。 在另一个实施例中，用于管理在一个条件下操作的彩色设备的颜色的设备配置文件从用于在其他条件下操作的颜色设备的设备配置文件（例如，基于根据用户界面的感知从用户界面接收的输入） 用户或基于传感器的测量）。 内插可以基于根据用户感知从用户界面接收的输入，或者可以基于传感器或一组传感器的测量。 用于彩色设备（例如，扫描仪，照相机，摄像机，打印机，CRT显示器或LCD显示面板，电视机等的显示设备）的各种操作条件包括色度和环境照度 用于显示设备的光，背景颜色，用于打印机的打印介质的特性，用于喷墨打印机的湿度，温度，压力和墨水水平，扫描仪的光源的时代等。

公开(公告)号：US07688328B2

公开(公告)日：2010-03-30

申请号：US11265882

申请日：2005-11-02

申请人： Kok Chen ,  Gabriel G. Marcu

发明人： Kok Chen ,  Gabriel G. Marcu

IPC分类号： G09G5/02 ,  G09G3/36 ,  H04N5/202 ,  H04N5/14 ,  G06K9/00

CPC分类号： G09G5/02 ,  G09G2320/0666 ,  G09G2320/0673

摘要： White point is corrected without degrading luminance on a display device. A white point manager modifies the balance between red, green and blue according to a target white point up to a threshold gray value. As the gray scale approaches white from the threshold gray value, the white point manager blends the balance between red, green and blue from the target white point substantially towards the native white point for the display device, so as not to degrade luminance as the gray scale approaches white.

摘要翻译： 校正白点而不降低显示装置上的亮度。 白点管理员根据目标白点修改红，绿和蓝之间的平衡，直到阈值灰度值。 当灰度级从阈值灰度值接近白色时，白点管理器将红色，绿色和蓝色之间的平衡从目标白点基本上与显示设备的本机白点混合，以免将亮度降低为灰色 规模接近白色。

公开(公告)号：US20070206028A1

公开(公告)日：2007-09-06

申请号：US11745157

申请日：2007-05-07

申请人： Mark Zimmer ,  Kok Chen

发明人： Mark Zimmer ,  Kok Chen

IPC分类号： G09G5/00

CPC分类号： G06T11/203 ,  G06T5/002 ,  G06T5/20

摘要： A method, device and computer system for creating a smooth, continuous height (scalar or vector) field are described. The described techniques permit arbitrary closed regions to be smoothly shaded without producing unnatural smoothness at the region's edges or boundaries.

摘要翻译： 描述了用于创建平滑，连续的高度（标量或矢量）场的方法，设备和计算机系统。 所描述的技术允许任意闭合区域被平滑地遮蔽，而不会在该区域的边缘或边界处产生不自然的平滑度。

公开(公告)号：US20080024805A1

公开(公告)日：2008-01-31

申请号：US11902778

申请日：2007-09-25

申请人： Kevin Andresen ,  Kok Chen

发明人： Kevin Andresen ,  Kok Chen

IPC分类号： G06F15/00 ,  G03F3/08

CPC分类号： G06K15/02 ,  G06K15/1825 ,  G06K2215/0094 ,  G06T11/001 ,  H04N1/58

摘要： Undesirable artifacts appearing in color images, such as blooming or smudging around the edges of text, are avoided through selective reduction of the color gamut for objects which form the image. Individual component color values are modified by taking into account combinations of colors and their effect upon the artifacts to be eliminated. Only those parameter values which contribute to the artifact are modified. Other parameter values are left intact, to maintain the original image characteristics. When a color value is modified, all components of that color are modified in a symmetrical manner, to preserve the hue of the original color. The impact on the image is further minimized by selectively applying color correction only to those objects in which the artifact is pronounced.

摘要翻译： 通过选择性地减少形成图像的对象的色域来避免出现在彩色图像中的不期望的伪像，例如在文本边缘处的起霜或污迹。 通过考虑颜色的组合及其对待消除的伪影的影响来修改单个组件颜色值。 只修改有助于工件的参数值。 其他参数值保持原样，以保持原始图像特征。 当颜色值被修改时，该颜色的所有成分都以对称方式修改，以保持原始颜色的色调。 通过选择性地将色彩校正仅仅应用于伪造物的那些对象来进一步减小对图像的影响。

公开(公告)号：US07084881B1

公开(公告)日：2006-08-01

申请号：US10637246

申请日：2003-08-07

申请人： Kok Chen ,  Gabriel G. Marcu ,  Steve Swen

发明人： Kok Chen ,  Gabriel G. Marcu ,  Steve Swen

IPC分类号： G09G5/02 ,  G06K9/00

CPC分类号： G09G5/02 ,  G06T11/001 ,  G09G3/3607 ,  G09G5/06 ,  G09G5/366 ,  G09G2320/0276 ,  G09G2320/0606 ,  G09G2320/0666 ,  G09G2320/0673 ,  H04N9/69

摘要： Methods and apparatuses for color correction that includes gamma correction. One embodiment of the present invention pre-processes the native device information of a color device (e.g., a color display device) to generate pseudo-native device information such that when a single, unique function is applied on the pseudo-native device information, a customized look up table for gamma correction in a video card is generated. The customized look up table is calibrated for the optimization of color rendering for skin tone in one region in a color space while maintaining the gray colors for the user interface elements in another region in the color space.

公开(公告)号：US5724450A

公开(公告)日：1998-03-03

申请号：US312975

申请日：1994-09-30

申请人： Kok Chen ,  Michael Stokes

发明人： Kok Chen ,  Michael Stokes

IPC分类号： H04N1/60 ,  G03F3/08 ,  G06F15/00

CPC分类号： H04N1/6058

摘要： A method and system for compressing and color transforming image data are presented. Color transformation is a process whereby perceptional differences between the expressions of images in color devices are compensated. By transforming a compressed version of the image data, the amount of time in which it takes to perform color transformation can be reduced. Selection of compression techniques which maintain color characteristics of the image data in its compressed form permits the usage of color transformation techniques which already exist for the image data in its uncompressed form. The inventive techniques can be applied either prior to, or after, storage of the image data in an intermediate media or transmission from one device to another.

摘要翻译： 提出了压缩和颜色变换图像数据的方法和系统。 颜色变换是彩色设备中的图像表达之间的感知差异得到补偿的过程。 通过转换图像数据的压缩版本，可以减少执行颜色变换所需的时间量。 选择以压缩形式保持图像数据的颜色特性的压缩技术允许使用已经存在于其未压缩形式的图像数据的颜色变换技术。 本发明的技术可以在图像数据在从一个设备到另一个设备的中间介质或传输中存储之前或之后应用。

公开(公告)号：US5390263A

公开(公告)日：1995-02-14

申请号：US183633

申请日：1994-01-18

申请人： Randall G. Guay ,  Kok Chen

发明人： Randall G. Guay ,  Kok Chen

IPC分类号： G09G5/00 ,  G06T5/00 ,  H04N1/23 ,  H04N1/405 ,  G06K9/38

CPC分类号： H04N1/4055

摘要： An apparatus and method for imaging using context sensitive pixel modulation wherein a modulator dynamically examines the neighboring pixels to the current pixel being imaged and uses the neighboring pixel information in determining the specific modulation pattern for the current pixel.

摘要翻译： 一种使用上下文敏感像素调制成像的装置和方法，其中调制器动态地检查正在成像的当前像素的相邻像素，并且在确定当前像素的特定调制图案时使用相邻像素信息。