公开(公告)号：US20060056082A1

公开(公告)日：2006-03-16

申请号：US11054079

申请日：2005-02-08

申请人： Szepo Hung

发明人： Szepo Hung

IPC分类号： G02B7/02

CPC分类号： H04N5/217

摘要： Brightness and color tone shift distortion of captured images by a non-ideal lens can be compensated by applying an inverse transfer function to the captured image. An estimate of the lens transfer function can be measured based on a radius from a center of the lens. The lens transfer function can be measured by capturing a flat field image. The center of the lens can be determined based on a relative brightness maximum. The relative brightness of the captured flat field image can then be measured as a function of radius to generate a lens response curve. Separate response curves can be measured for each color component. A correction curve can be determined as the inverse of the response curve. The correction curve can be applied to subsequent captured images to compensate for lens degradation.

摘要翻译： 可以通过对拍摄图像应用反向传递函数来补偿非理想透镜的拍摄图像的亮度和色调偏移失真。 可以基于从透镜的中心的半径来测量透镜传递函数的估计。 可以通过捕获平坦场图像来测量透镜传递函数。 透镜的中心可以基于相对亮度最大值来确定。 然后可以测量捕获的平面场图像的相对亮度作为半径的函数，以产生透镜响应曲线。 可以测量每个颜色分量的独立响应曲线。 可以将校正曲线确定为响应曲线的倒数。 校正曲线可以应用于后续拍摄的图像以补偿镜片退化。

公开(公告)号：US20070183681A1

公开(公告)日：2007-08-09

申请号：US11352483

申请日：2006-02-09

申请人： Hsiang-Tsun Li ,  Szepo Hung

发明人： Hsiang-Tsun Li ,  Szepo Hung

IPC分类号： G06K9/40

CPC分类号： H04N9/07 ,  H04N5/3675 ,  H04N9/045

摘要： This disclosure describes adaptive filtering techniques to improve the quality of captured imagery, such as video or still images. In particular, this disclosure describes adaptive filtering techniques that filter each pixel as a function of a set of surrounding pixels. An adaptive image filter may compare image information associated with a pixel of interest to image information associated with a set of surrounding pixels by, for example, computing differences between the image information associated with the pixel of interest and each of the surrounding pixels of the set. The computed differences can be used in a variety of ways to filter image information of the pixel of interest. In some embodiments, for example, the adaptive image filter may include both a low pass component and high pass component that adjust as a function of the computed differences.

摘要翻译： 本公开描述了自适应滤波技术，以改善所捕获图像的质量，例如视频或静止图像。 特别地，本公开描述了根据一组周围像素来滤除每个像素的自适应滤波技术。 自适应图像滤波器可以通过例如计算与感兴趣像素相关联的图像信息与该组的每个周围像素之间的差异来比较与感兴趣像素相关联的图像信息与与一组周围像素相关联的图像信息 。 计算的差异可以以各种方式用于过滤感兴趣像素的图像信息。 在一些实施例中，例如，自适应图像滤波器可以包括作为所计算的差异的函数调整的低通分量和高通分量两者。

公开(公告)号：US20060245660A1

公开(公告)日：2006-11-02

申请号：US11043276

申请日：2005-01-25

申请人： Szepo Hung

发明人： Szepo Hung

IPC分类号： G06K9/40

CPC分类号： G06T5/002 ,  G06T5/20 ,  G06T2207/10024 ,  G06T2207/20012 ,  G06T2207/20192 ,  H04N5/217

摘要： An adaptive filter according to one embodiment includes an N×N two-dimensional convolution, where N is an odd integer greater than one. Pixels of an image are filtered by moving the N×N kernel across the image. At each pixel location, the kernel coefficients are determined by the image pixels within the N×N region, such that the kernel coefficients may change from one pixel location to the next. Such a filter may be implemented to use a lookup table to approximate a floating-point operation.

摘要翻译： 根据一个实施例的自适应滤波器包括N×N二维卷积，其中N是大于1的奇整数。 通过在图像上移动NxN内核来过滤图像的像素。 在每个像素位置，内核系数由NxN区域内的图像像素确定，使得核系数可以从一个像素位置改变到下一个像素位置。 可以实现这种滤波器以使用查找表来近似浮点运算。

公开(公告)号：US20050286097A1

公开(公告)日：2005-12-29

申请号：US11043572

申请日：2005-01-25

申请人： Szepo Hung ,  Ananthapadmanabhan Kandhadai ,  Andrew Chiu

发明人： Szepo Hung ,  Ananthapadmanabhan Kandhadai ,  Andrew Chiu

IPC分类号： H04N1/46 ,  H04N1/60 ,  H04N9/73

CPC分类号： H04N1/608 ,  H04N1/6086 ,  H04N9/735

摘要： Automatic white balance of captured images can be performed based on a gray world assumption. Initially, a flat field gray image is captured for one or more reference illuminations. The statistics of the captured gray image are determined and stored for each reference illumination during a calibration process. For each subsequent captured image, the image is filtered to determine a subset of gray pixels. The gray pixels are further divided into a one or more gray clusters. The average weight of the one or more gray clusters is determined and a distance from the average weights to the reference illuminants is determined. An estimate of the illuminant is determined depending on the distances. White balance gains are applied to the image based on the estimated illuminant.

摘要翻译： 可以基于灰色世界假设执行拍摄图像的自动白平衡。 最初，对于一个或多个参考照明捕获平坦场灰色图像。 在校准过程中，为每个参考照明确定捕获的灰度图像的统计数据并存储。 对于每个后续捕获的图像，滤波图像以确定灰色像素的子集。 灰色像素被进一步分成一个或多个灰色簇。 确定一个或多个灰色簇的平均重量，并确定从平均重量到参考光源的距离。 根据距离确定光源的估计。 基于估计的光源将白平衡增益应用于图像。

公开(公告)号：US20070248286A1

公开(公告)日：2007-10-25

申请号：US11409456

申请日：2006-04-20

申请人： Hsiang-Tsun Li ,  Kalin Atanassov ,  Szepo Hung

发明人： Hsiang-Tsun Li ,  Kalin Atanassov ,  Szepo Hung

IPC分类号： G06K9/32 ,  G09G5/00

CPC分类号： G06T3/4084

摘要： A method and apparatus for down scaling image data is disclosed. One method controls a phase for an M/N filter, where N represents a number of input samples, and M represents a number of output samples. N is greater than M. Another method may switch between an M/N filter and a phase-controlled M/N filter.

摘要翻译： 公开了一种用于缩小图像数据的方法和装置。 一种方法控制用于M / N滤波器的相位，其中N表示输入样本的数量，M表示输出样本的数量。 N大于M.另一种方法可以在M / N滤波器和相位控制的M / N滤波器之间切换。

公开(公告)号：US20080166117A1

公开(公告)日：2008-07-10

申请号：US11619694

申请日：2007-01-04

申请人： Jingqiang Li ,  Szepo Hung

发明人： Jingqiang Li ,  Szepo Hung

IPC分类号： G03B13/34

CPC分类号： H04N5/23248 ,  H04N5/23212 ,  H04N5/23254 ,  H04N5/23274

摘要： A method and device are provided for mitigating and/or minimizing effects of hand jitter or shaking during an auto-focusing process of an image-capturing device. In order to more accurately focus a lens for capturing a digital image, the lens is moved between a minimum and maximum position (along an axis) while capturing sample image frames using a focus window at various lens positions. Improved auto-focusing is achieved by dynamically adjusting the relative position of the focus window for each image frame to cover substantially the same image portion of the target image. By adjusting the focus window for each image frame to cover substantially the same image portion of the target image, variations from shaking may be minimized, thereby improving auto-focusing.

摘要翻译： 提供了一种方法和装置，用于在图像捕获装置的自动对焦过程期间减轻和/或最小化手抖动或抖动的影响。 为了更精确地聚焦用于捕获数字图像的透镜，透镜在最小和最大位置（沿着轴）之间移动，同时使用各种透镜位置处的对焦窗口捕获采样图像帧。 通过动态调整每个图像帧的对焦窗口的相对位置以覆盖目标图像的基本相同的图像部分来实现改进的自动聚焦。 通过调整每个图像帧的对焦窗口以覆盖目标图像的基本上相同的图像部分，可以使抖动的变化最小化，从而改善自动聚焦。

公开(公告)号：US20070041661A1

公开(公告)日：2007-02-22

申请号：US11208270

申请日：2005-08-18

申请人： Szepo Hung ,  Ananthapadmanabhan Kandhadai

发明人： Szepo Hung ,  Ananthapadmanabhan Kandhadai

IPC分类号： G06K9/32

CPC分类号： H04N5/202

摘要： A method of processing an image includes selecting, for each of a plurality of picture element values in at least a portion of the image, one among a plurality of offset values. For each of the plurality of picture element values, an index value is obtained based on (A) the selected offset value and (B) a portion of the picture element value. For each of the plurality of picture element values, an entry is retrieved from a lookup table according to the corresponding index value.

摘要翻译： 处理图像的方法包括针对图像的至少一部分中的多个图像元素值中的每一个选择多个偏移值中的一个。 对于多个像素值中的每一个，基于（A）所选择的偏移值和（B）图像元素值的一部分来获得索引值。 对于多个图像元素值中的每一个，根据相应的索引值从查找表中检索条目。

公开(公告)号：US07634187B2

公开(公告)日：2009-12-15

申请号：US11619694

申请日：2007-01-04

申请人： Jingqiang Li ,  Szepo Hung

发明人： Jingqiang Li ,  Szepo Hung

IPC分类号： G03B13/34

CPC分类号： H04N5/23248 ,  H04N5/23212 ,  H04N5/23254 ,  H04N5/23274

摘要： The invention relates to methods and devices for mitigating and/or minimizing effects of hand jitter or shaking during an auto-focusing process of an image-capturing device. In order to more accurately focus a lens for capturing a digital image, the lens is moved between a minimum and maximum position (along an axis) while capturing sample image frames using a focus window at various lens positions. Improved auto-focusing is achieved by dynamically adjusting the relative position of the focus window for each image frame to cover substantially the same image portion of the target image. By adjusting the focus window for each image frame to cover substantially the same image portion of the target image, variations from shaking may be minimized, thereby improving auto-focusing.

摘要翻译： 本发明涉及用于减轻和/或最小化在图像拍摄装置的自动对焦过程中手抖动或抖动的影响的方法和装置。 为了更精确地聚焦用于捕获数字图像的透镜，透镜在最小和最大位置（沿着轴）之间移动，同时使用各种透镜位置处的对焦窗口捕获采样图像帧。 通过动态调整每个图像帧的对焦窗口的相对位置以覆盖目标图像的基本相同的图像部分来实现改进的自动聚焦。 通过调整每个图像帧的对焦窗口以覆盖目标图像的基本上相同的图像部分，可以使抖动的变化最小化，从而改善自动聚焦。

公开(公告)号：US20070133071A1

公开(公告)日：2007-06-14

申请号：US11404477

申请日：2006-04-13

申请人： Ying Noyes ,  Szepo Hung

发明人： Ying Noyes ,  Szepo Hung

IPC分类号： H04N1/46

CPC分类号： H04N1/6027 ,  H04N9/735

摘要： An imaging system generates a gain for a component of an image format. The gain is at least partially dependent on the brightness of the light source illuminating a scene when an image of the scene was generated. The gain can be used to correct the component of the image format for the color shift in the image caused by the light source. In some instances, the imaging system generates a gain for a plurality of the components of the image format or for all of the components of the image format. The gains can be used to correct the components for the color shift in the image caused by the light source.

摘要翻译： 成像系统为图像格式的分量生成增益。 当生成场景的图像时，增益至少部分地取决于照亮场景的光源的亮度。 增益可用于校正由光源引起的图像中颜色偏移的图像格式的分量。 在一些情况下，成像系统为图像格式的多个分量或图像格式的所有分量生成增益。 增益可以用于校正由光源引起的图像中的颜色偏移的分量。