公开(公告)号：US08265391B1

公开(公告)日：2012-09-11

申请号：US13194054

申请日：2011-07-29

申请人： Sujith Srinivasan ,  Nikhil Balram

发明人： Sujith Srinivasan ,  Nikhil Balram

IPC分类号： G06K9/00

CPC分类号： H04N5/57 ,  G06T5/009 ,  G06T5/40 ,  G06T2207/10016 ,  H04N21/4318 ,  H04N21/44008

摘要： An adaptive histogram equalization-based approach improves contrast in a video signal. For each video frame, the histogram of the pixel luminance values is calculated. The calculated histogram is divided into three programmably-sized regions that are equalized independently of each other. The equalization is performed in a controlled fashion by clamping the peaks of the histogram thereby ensuring limited stretching of sharp peaks. The equalized values are averaged with the original pixel values with a weighting factor that is different for the three regions chosen such that the darker regions are enhanced more than the brighter ones. To ensure smooth enhancement, programmable guard band regions can be defined between the three divisions of the histogram. The statistics calculated from one frame may be used to enhance the next frame to eliminate the need for frame buffers. Many of the calculations may be performed in the inactive time between two frames.

摘要翻译： 基于自适应直方图均衡的方法提高了视频信号的对比度。 对于每个视频帧，计算像素亮度值的直方图。 计算出的直方图被分成三个相互独立的可编程大小的区域。 通过夹紧直方图的峰值，以受控的方式进行均衡，从而确保锐利峰值的有限拉伸。 均衡值与原始像素值平均，加权因子对于所选择的三个区域是不同的，使得较暗区域比较亮区域增强。 为了确保平滑增强，可以在直方图的三个部分之间定义可编程的保护带区域。 从一帧计算的统计量可以用于增强下一帧以消除对帧缓冲器的需要。 许多计算可以在两帧之间的非活动时间内执行。

公开(公告)号：US08233730B1

公开(公告)日：2012-07-31

申请号：US12400207

申请日：2009-03-09

申请人： Vipin Namboodiri ,  Mainak Biswas ,  Sujith Srinivasan

发明人： Vipin Namboodiri ,  Mainak Biswas ,  Sujith Srinivasan

IPC分类号： G06K9/36

CPC分类号： H04N19/521 ,  H04N5/145 ,  H04N7/014

摘要： Systems and methods for identifying motion between a previous frame and a current frame. The system may include a fast Fourier transform calculator that generates low pass frequency domain outputs and high pass frequency domain outputs of previous frame data and current frame data. The system may further include a phase difference calculator that calculates a first phase difference between the low pass frequency domain outputs and a second phase difference between the high pass frequency domain outputs. An inverse Fourier transform calculator may be included to generate a first inverse Fourier result and a second inverse Fourier result based on the first and second phase difference respectively, and a motion vector calculator may be included for generating motion vectors based on the inverse Fourier results.

摘要翻译： 用于识别先前帧和当前帧之间的运动的系统和方法。 该系统可以包括快速傅立叶变换计算器，其产生先前帧数据和当前帧数据的低通频域输出和高通频域输出。 该系统还可以包括相位差计算器，其计算低通频域输出与高通频域输出之间的第二相位差之间的第一相位差。 可以包括逆傅立叶变换计算器，以分别产生基于第一和第二相位差的第一傅立叶逆傅立叶反相结果和第二反相傅立叶结果，并且可以包括运动矢量计算器，用于基于傅里叶逆傅立叶结果产生运动矢量。

公开(公告)号：US07734114B1

公开(公告)日：2010-06-08

申请号：US11295882

申请日：2005-12-07

申请人： Sujith Srinivasan ,  Nikhil Balram

发明人： Sujith Srinivasan ,  Nikhil Balram

IPC分类号： G06K9/40 ,  G06K9/00 ,  G03F3/08 ,  H04N7/01 ,  H04N11/20 ,  H04N9/64 ,  H04N9/68

CPC分类号： H04N9/67 ,  H04N9/68

摘要： The intelligent saturation controller calculates the exact maximum saturation any valid YCbCr pixel can undergo before it becomes invalid in RGB space. The controller models the saturation operation in RGB color space and calculates the maximum saturation level at which the RGB values falls outside the valid range. The saturation operation is performed independently for every pixel of the incoming video frame and ensures that each output pixel is a valid. The controller finds the maximum saturation for each input pixel and checks whether it is less than the input saturation factor. If so, then this calculated maximum saturation value is applied. If not, the input saturation factor is applied. Accordingly, the output RGB pixels are valid and no clamping is necessary if no other video processing is done in YCbCr space. Increasing the saturation of the video signal results in a more vivid and more colorful picture.

摘要翻译： 智能饱和控制器计算任何有效YCbCr像素在RGB空间变为无效之前可以经历的精确最大饱和度。 控制器对RGB色彩空间中的饱和度进行建模，并计算RGB值超出有效范围的最大饱和度。 对输入视频帧的每个像素独立地执行饱和度运算，并确保每个输出像素都是有效的。 控制器找到每个输入像素的最大饱和度，并检查它是否小于输入饱和因子。 如果是，则应用该计算的最大饱和值。 如果不是，则应用输入饱和因子。 因此，如果在YCbCr空间中没有进行其他视频处理，则输出RGB像素是有效的，并且不需要钳位。 增加视频信号的饱和度会导致更生动和更丰富多彩的画面。

公开(公告)号：US08571347B2

公开(公告)日：2013-10-29

申请号：US12555960

申请日：2009-09-09

申请人： Sujith Srinivasan ,  Byas Muni ,  Sanjay Garg

发明人： Sujith Srinivasan ,  Byas Muni ,  Sanjay Garg

IPC分类号： G06K9/40

CPC分类号： G06T5/002 ,  G06T5/003 ,  G06T2207/10016 ,  G06T2207/20012 ,  H04N19/117 ,  H04N19/14 ,  H04N19/17 ,  H04N19/172 ,  H04N19/176 ,  H04N19/86

摘要： Devices, systems, methods, and other embodiments associated with reducing digital image noise are described. In one embodiment, a method includes determining, on a per pixel basis, mosquito noise values associated with pixels of a digital image. The method determines, on a per pixel basis, block noise values associated with the digital image. The method filters the digital image with a plurality of adaptive filters. A compression artifact in the digital image is reduced. The compression artifact is reduced by combining filter outputs from the plurality of adaptive filters. The filter outputs are combined based, at least in part, on the mosquito noise values and the block noise values.

摘要翻译： 描述了与降低数字图像噪声相关联的设备，系统，方法和其它实施例。 在一个实施例中，一种方法包括在每像素的基础上确定与数字图像的像素相关联的蚊式噪声值。 该方法在每像素的基础上确定与数字图像相关联的块噪声值。 该方法用多个自适应滤波器对数字图像进行滤波。 数字图像中的压缩伪影减少。 通过组合来自多个自适应滤波器的滤波器输出来减小压缩伪影。 滤波器输出至少部分地基于蚊式噪声值和块噪声值组合。

公开(公告)号：US08537177B2

公开(公告)日：2013-09-17

申请号：US12815884

申请日：2010-06-15

申请人： Vasudev Bhaskaran ,  Sujith Srinivasan ,  Nikhil Balram

发明人： Vasudev Bhaskaran ,  Sujith Srinivasan ,  Nikhil Balram

IPC分类号： G09G5/00 ,  G09G5/02 ,  H04N9/64 ,  H04N5/44 ,  H04N9/68 ,  H04N1/46 ,  H04N1/40 ,  G03F3/08 ,  G06K9/00 ,  G06K9/40 ,  G06K9/36

CPC分类号： G09G5/02 ,  H04N1/6027 ,  H04N1/6058

摘要： System and methods for gamut bounded saturation adaptive color enhancement are provided. Color enhancement incorporating gamut bounded saturation enhances colors of an pixel from a source color gamut such that the resulting color is within a target color gamut. This resulting color may, for example, take advantage of an expanded target color gamut of a display. Gamut bounded saturation may be implemented independently or in combination with RGB bounded saturation.

摘要翻译： 提供了色域有界饱和自适应色彩增强的系统和方法。 结合色域有界饱和度的色彩增强增强了来自源色域的像素的颜色，使得所得到的颜色在目标色域内。 例如，所产生的颜色可以利用显示器的扩展的目标色域。 可以独立地或与RGB有界饱和结合实现色域有界饱和度。

公开(公告)号：US20120027103A1

公开(公告)日：2012-02-02

申请号：US13023769

申请日：2011-02-09

申请人： Byas Muni ,  Sujith Srinivasan

发明人： Byas Muni ,  Sujith Srinivasan

IPC分类号： H04N7/30

CPC分类号： H04N19/14 ,  H04N19/172 ,  H04N19/182 ,  H04N19/44 ,  H04N19/86 ,  H04N19/865

摘要： Systems and methods are provided for determining characteristics of video data. A frame of video data is obtained, where the frame is represented by pixel data. A value is assigned to an element of a detection array based on pixel data in a portion of the video frame corresponding to the element. A frequency transform of values of the detection array is determined, and a characteristic of the video data is extracted based on the output of the frequency transform.

摘要翻译： 提供了用于确定视频数据的特征的系统和方法。 获得视频数据帧，其中帧由像素数据表示。 基于与元素对应的视频帧的一部分中的像素数据，将值分配给检测阵列的元素。 确定检测阵列的值的频率变换，并且基于频率变换的输出提取视频数据的特性。

公开(公告)号：US08077184B1

公开(公告)日：2011-12-13

申请号：US13045364

申请日：2011-03-10

申请人： Sujith Srinivasan ,  Nikhil Balram

发明人： Sujith Srinivasan ,  Nikhil Balram

IPC分类号： G09G5/02

CPC分类号： G09G5/02 ,  G09G2320/0666

摘要： The color remapping system places axes on the Cb-Cr color plane to differentiate and isolate colors of interest. Each axis has a programmable position, hue change value and saturation change value. Input pixels from the video data stream are calibrated with respect to the axes and enhanced based upon the two neighboring axes adjacent to the input pixels. The system can be reconfigured in real time by repositioning the axes and changing their hue and saturation change values. The system is easy to program and reconfigure and provides visually pleasing enhancements to the digital video.

公开(公告)号：US07907148B1

公开(公告)日：2011-03-15

申请号：US11296163

申请日：2005-12-07

申请人： Sujith Srinivasan ,  Nikhil Balram

发明人： Sujith Srinivasan ,  Nikhil Balram

IPC分类号： G09G5/02

CPC分类号： G09G5/02 ,  G09G2320/0666

摘要： The color remapping system places axes on the Cb-Cr color plane to differentiate and isolate colors of interest. Each axis has a programmable position, hue change value and saturation change value. Input pixels from the video data stream are calibrated with respect to the axes and enhanced based upon the two neighboring axes adjacent to the input pixels. The system can be reconfigured in real time by repositioning the axes and changing their hue and saturation change values. The system is easy to program and reconfigure and provides visually pleasing enhancements to the digital video.

摘要翻译： 颜色重新映射系统将轴放置在Cb-Cr色平面上，以区分和隔离感兴趣的颜色。 每轴具有可编程位置，色调变化值和饱和度变化值。 来自视频数据流的输入像素相对于轴进行校准，并且基于与输入像素相邻的两个相邻轴进行增强。 可以通过重新定位轴和改变其色调和饱和度变化值来实时重新配置系统。 该系统易于编程和重新配置，并为数字视频提供视觉上令人满意的增强功能。

公开(公告)号：US20110013208A1

公开(公告)日：2011-01-20

申请号：US12815884

申请日：2010-06-15

申请人： Vasudev Bhaskaran ,  Sujith Srinivasan ,  Nikhil Balram

发明人： Vasudev Bhaskaran ,  Sujith Srinivasan ,  Nikhil Balram

IPC分类号： H04N1/60

CPC分类号： G09G5/02 ,  H04N1/6027 ,  H04N1/6058

摘要： System and methods for gamut bounded saturation adaptive color enhancement are provided. Color enhancement incorporating gamut bounded saturation enhances colors of an pixel from a source color gamut such that the resulting color is within a target color gamut. This resulting color may, for example, take advantage of an expanded target color gamut of a display. Gamut bounded saturation may be implemented independently or in combination with RGB bounded saturation.

摘要翻译： 提供了色域有界饱和自适应色彩增强的系统和方法。 结合色域有界饱和度的色彩增强增强了来自源色域的像素的颜色，使得所得到的颜色在目标色域内。 例如，所产生的颜色可以利用显示器的扩展的目标色域。 可以独立地或与RGB有界饱和结合实现色域有界饱和度。

公开(公告)号：US20100060749A1

公开(公告)日：2010-03-11

申请号：US12555960

申请日：2009-09-09

申请人： Sujith SRINIVASAN ,  Byas MUNI ,  Sanjay GARG

发明人： Sujith SRINIVASAN ,  Byas MUNI ,  Sanjay GARG

IPC分类号： G06K9/40 ,  H04N5/228

CPC分类号： G06T5/002 ,  G06T5/003 ,  G06T2207/10016 ,  G06T2207/20012 ,  H04N19/117 ,  H04N19/14 ,  H04N19/17 ,  H04N19/172 ,  H04N19/176 ,  H04N19/86

摘要： Devices, systems, methods, and other embodiments associated with reducing digital image noise are described. In one embodiment, a method includes determining, on a per pixel basis, mosquito noise values associated with pixels of a digital image. The method determines, on a per pixel basis, block noise values associated with the digital image. The method filters the digital image with a plurality of adaptive filters. A compression artifact in the digital image is reduced. The compression artifact is reduced by combining filter outputs from the plurality of adaptive filters. The filter outputs are combined based, at least in part, on the mosquito noise values and the block noise values.

摘要翻译： 描述了与降低数字图像噪声相关联的设备，系统，方法和其它实施例。 在一个实施例中，一种方法包括在每像素的基础上确定与数字图像的像素相关联的蚊式噪声值。 该方法在每像素的基础上确定与数字图像相关联的块噪声值。 该方法用多个自适应滤波器对数字图像进行滤波。 数字图像中的压缩伪影减少。 通过组合来自多个自适应滤波器的滤波器输出来减小压缩伪影。 滤波器输出至少部分地基于蚊式噪声值和块噪声值组合。