公开(公告)号：US20070189380A1

公开(公告)日：2007-08-16

申请号：US11674647

申请日：2007-02-13

Applicant: Kwong Goh ,  Hui Lucas

Inventor： Kwong Goh ,  Hui Lucas

IPC: H04N11/04 ,  H04N7/12

CPC classification number: H04N19/174 ,  H04N19/124 ,  H04N19/126 ,  H04N19/149 ,  H04N19/152 ,  H04N19/172 ,  H04N19/61

Abstract: A method and apparatus for Video Buffer Verifier (VBV) underflow and overflow control. A combination of picture and slice level control is used in the method and apparatus. Improved prevention of overflow and panic mode encoding is achieved by adjusting the virtual buffer-fullness which allows the quantization-step to have an improved response to the buffer-fullness at both high and low critical levels. The use of a non-linear quantization scheme and customised quantization matrices also provide improved prevention of panic mode encoding. The slice level control also reduces the computation complexity compared to the macroblock level control.

Abstract translation: 一种用于视频缓冲验证器（VBV）下溢和溢出控制的方法和装置。 在方法和装置中使用图像和切片电平控制的组合。 通过调整虚拟缓冲器充满度来实现改进的溢出和紧急模式编码的预防，这允许量化步骤对高和低临界水平的缓冲器充满度具有改进的响应。 使用非线性量化方案和定制的量化矩阵还提供改进的对紧急模式编码的预防。 与宏块级控制相比，限幅电平控制也降低了计算复杂度。

公开(公告)号：US20050031201A1

公开(公告)日：2005-02-10

申请号：US10878981

申请日：2004-06-28

Applicant: Kwong Goh

Inventor： Kwong Goh

IPC: G06T5/00 ,  G06T5/40 ,  G06K9/00 ,  G06K9/40 ,  H04N5/14

CPC classification number: G06T5/009 ,  G06T5/40 ,  G06T2207/10016

Abstract: A method for enhancing the contrast of video pictures that includes the steps of receiving an input video signal; extracting a picture from said input video signal; determining an active window for said picture; calculating a histogram for luminance values of pixels in said active window of said picture; determining characteristics of said histogram; selecting one suitable mapping function from a plurality of mapping functions based on the determined characteristics of said histogram; and mapping the luminance value of each pixel in said picture in accordance with said selected mapping function.

Abstract translation: 一种用于增强视频图像的对比度的方法，包括接收输入视频信号的步骤; 从所述输入视频信号中提取图像; 确定所述图片的活动窗口; 计算所述图像的所述活动窗口中的像素的亮度值的直方图; 确定所述直方图的特性; 基于所确定的所述直方图的特性，从多个映射函数中选择一个合适的映射函数; 以及根据所述选择的映射函数映射所述图像中的每个像素的亮度值。

公开(公告)号：US20050007497A1

公开(公告)日：2005-01-13

申请号：US10847205

申请日：2004-05-17

Applicant: Yong Huang ,  Patricia Chiang ,  Lucas Hui ,  Kwong Goh

Inventor： Yong Huang ,  Patricia Chiang ,  Lucas Hui ,  Kwong Goh

IPC: H04N5/52 ,  H04N9/64 ,  H04N9/68 ,  H04N9/77

CPC classification number: H04N9/68 ,  H04N9/77

Abstract: A method of colour saturation compensation in a video signal is disclosed. The method includes the steps of: processing a luminance signal component of the video signal; determining whether the processing of the luminance signal results in a change in chrominance saturation; if the step of determining reveals that the chrominance saturation has changed, applying a chrominance compensation signal to the chrominance signals to counteract the effects of chrominance saturation, wherein said step of applying a compensation signal include the steps of: generating a compensation signal which is dependent on hue and luminance ratio (output luminance signal/input luminance signal). Apparatus for performing the method is also disclosed.

Abstract translation: 公开了一种视频信号中色彩饱和补偿的方法。 该方法包括以下步骤：处理视频信号的亮度信号分量; 确定亮度信号的处理是否导致色度饱和度的变化; 如果确定步骤显示色度饱和度已经改变，则将色度补偿信号施加到色度信号以抵消色度饱和的影响，其中所述施加补偿信号的步骤包括以下步骤：产生依赖的补偿信号 色相和亮度比（输出亮度信号/输入亮度信号）。 还公开了用于执行该方法的装置。