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171. 发明授权

US07221408B2 Adaptive contrast enhancement method for video signals based on time-varying nonlinear transforms 失效
标题翻译：基于时变非线性变换的视频信号的自适应对比度增强方法
公开(公告)号：US07221408B2
公开(公告)日：2007-05-22
申请号：US10641970
申请日：2003-08-15
申请人： Yeong-Taeg Kim
发明人： Yeong-Taeg Kim
IPC分类号： H04N5/52
CPC分类号： G06T5/009 , G06T2207/10016 , H04N5/20
摘要： An adaptive contrast enhancement (ACE) method and apparatus provide a natural enhancement in accordance with the time-varying characteristics of a video sequence. Characteristics of a time varying video sequence are specified and a nonlinear transform over the input video sequence is performed to enhance mainly the contrast of the input. A probability density function (PDF) of a time varying input video sequence is computed and then some predetermined video parameters relating to contrast is extracted from the PDF. Based upon the extracted video parameters, a nonlinear transform function is then constructed and updated as a look up table (LUT), which is synchronized with the associated video picture or field SYNC signal. The transform LUT is then applied to the input video to provide an enhanced video output signal.
摘要翻译：自适应对比度增强（ACE）方法和装置根据视频序列的时变特性提供自然增强。指定时变视频序列的特征，并且执行输入视频序列上的非线性变换以主要增强输入的对比度。计算时变输入视频序列的概率密度函数（PDF），然后从PDF中提取与对比度相关的一些预定视频参数。基于所提取的视频参数，然后构造和更新非线性变换函数作为与关联的视频图像或场SYNC信号同步的查找表（LUT）。然后将变换LUT应用于输入视频以提供增强的视频输出信号。

172. 发明申请

US20070071350A1 Image enhancement method using local illumination correction 失效
标题翻译：使用局部照明校正的图像增强方法
公开(公告)号：US20070071350A1
公开(公告)日：2007-03-29
申请号：US11240306
申请日：2005-09-29
申请人： Sangkeun Lee , Yeong-Taeg Kim
发明人： Sangkeun Lee , Yeong-Taeg Kim
IPC分类号： G06K9/40
CPC分类号： G06T5/008
摘要： An image processing system for implementing a variant of Retinex algorithm based on local illumination correction is provided to improve an intensity value of each position of an input image. The image processing system provides the ability to distinguish details when compressing dynamic range of a given image. Specifically, first the illumination of the image is estimated by performing a weighted low pass filter (WLPF) operation, and the original image is separated into the illumination and the reflectance images. Next, the estimated illumination is modified by using a non-linear mapping function based on local illumination at each pixel location. Then, the modified illumination image is combined with the reflectance image. Finally, an enhanced image is obtained after a contrast correction procedure.
摘要翻译：提供了一种用于实现基于局部照明校正的Retinex算法的变体的图像处理系统，以改善输入图像的每个位置的强度值。当压缩给定图像的动态范围时，图像处理系统提供区分细节的能力。具体地，首先，通过执行加权低通滤波器（WLPF）操作来估计图像的照明，并将原始图像分离成照明和反射图像。接下来，通过使用基于每个像素位置处的局部照明的非线性映射函数来修改估计照明。然后，将修改的照明图像与反射图像组合。最后，在对比度校正程序之后获得增强图像。

173. 发明申请

US20070070250A1 Methods for adaptive noise reduction based on global motion estimation 失效
标题翻译：基于全局运动估计的自适应降噪方法
公开(公告)号：US20070070250A1
公开(公告)日：2007-03-29
申请号：US11236936
申请日：2005-09-27
申请人： Zhi Zhou , Yeong-Taeg Kim
发明人： Zhi Zhou , Yeong-Taeg Kim
IPC分类号： H04N5/00 , H04N5/14
CPC分类号： H04N5/145 , H04N5/21
摘要： An improved temporal noise reduction method and system detects the global motion and adjusts the overall gain of the temporal filtering. Temporal noise reduction is applied to two video frames, wherein one video frame is the current input noisy frame, and the other video frame is a previous filtered frame stored in memory. In this method, noise estimation is first performed to estimate the noise variance/standard deviation in the input video sequence. Then, motion estimation is applied to obtain the motion vectors indicating relative motion between the pixels in the current noisy frame and the corresponding pixels in the previous noise-reduced frame. From such motion vectors, global motion estimation is applied to estimate the camera motion of the video sequence. If reliable global motion is obtained, the overall gain of the temporal filtering is reduced by adjusting the estimated noise level. Motion blur is thus prevented.
摘要翻译：改进的时间噪声降低方法和系统检测全局运动并调整时间滤波的总体增益。时间噪声降低被应用于两个视频帧，其中一个视频帧是当前输入噪声帧，而另一个视频帧是存储在存储器中的先前滤波的帧。在该方法中，首先执行噪声估计以估计输入视频序列中的噪声方差/标准偏差。然后，应用运动估计来获得指示当前噪声帧中的像素与先前减噪帧中的相应像素之间的相对运动的运动矢量。从这样的运动矢量，应用全局运动估计来估计视频序列的相机运动。如果获得可靠的全局运动，则通过调整估计的噪声电平来减小时间滤波的总体增益。因此防止运动模糊。

174. 发明授权

US07139036B2 Method and apparatus for image detail enhancement using filter bank 失效
公开(公告)号：US07139036B2
公开(公告)日：2006-11-21
申请号：US10355721
申请日：2003-01-31
申请人： Xianglin Wang , Yeong-Taeg Kim
发明人： Xianglin Wang , Yeong-Taeg Kim
IPC分类号： H04N5/21
CPC分类号： H04N5/208
摘要： An image detail enhancement method and apparatus that is suitable for different types of digital images, regardless of their signal frequency range or noise level. The detail enhancement apparatus has multiple filters termed, detail filter bank. A detail filter can be e.g. a high pass filter (HPF) or a band pass filter (BPF). In a detail filter bank, each detail filter has a pass band covering a specific frequency range and can therefore be used to obtain the detail signal in the corresponding frequency range from the original signal. The detail signals from those detail filters can then be processed before added back to the original signal as enhancements. This provides image detail enhancement that is suitable for different types of digital images (regardless of their signal frequency range or noise level).

175. 发明申请

US20060256129A1 Method and system for display color correction 审中-公开
标题翻译：显示颜色校正方法和系统
公开(公告)号：US20060256129A1
公开(公告)日：2006-11-16
申请号：US11128761
申请日：2005-05-12
申请人： Ning Xu , Yeong-Taeg Kim
发明人： Ning Xu , Yeong-Taeg Kim
IPC分类号： G09G5/02
CPC分类号： H04N9/67 , H04N1/603 , H04N17/02 , H04N17/04
摘要： A method is presented for realizing standard colors on a display that does not have the standard primaries. The method enables a display with non-standard primaries to show colors as it has standard SMPTE-C primaries. Further, a method is presented to show the same standard colors on different locations of the display. Measurements of the physical parameters of the display's color primaries are obtained and implemented as calibrated display or a display which can be calibrated by user/calibrator with a color measuring tool such as calorimeter or spectroradiometer.
摘要翻译：提出了一种在不具有标准原色的显示器上实现标准颜色的方法。该方法使具有非标准原色的显示器显示颜色，因为它具有标准的SMPTE-C原色。此外，呈现了在显示器的不同位置显示相同的标准颜色的方法。显示器颜色原色的物理参数的测量被获得并被实现为校准显示器或显示器，其可以由用户/校准器用诸如量热计或分光光度计的颜色测量工具进行校准。

176. 发明申请

US20060221252A1 Reliability estimation of temporal noise estimation 失效
标题翻译：时间噪声估计的可靠性估计
公开(公告)号：US20060221252A1
公开(公告)日：2006-10-05
申请号：US11100369
申请日：2005-04-05
申请人： Zhi Zhou , Yeong-Taeg Kim
发明人： Zhi Zhou , Yeong-Taeg Kim
IPC分类号： H04N5/14
CPC分类号： H04N17/00
摘要： A method for reliability estimation of temporal noise estimation in a sequence of video frames. The temporal local differences from a difference between a previous frame and a next frame in the sequence of frames is determined. A distribution of the temporal local difference is determined. Characteristics values of the distribution are determined. The characteristics values are compared to the thresholds to obtain an indication of the reliability of the temporal noise estimation. If the estimated noise variance is determined as not reliable, it will be discarded and the previous estimated reliable noise variance will be used instead indicating the noise level of the current frame.
摘要翻译：一种视频帧序列中时间噪声估计的可靠性估计方法。确定与帧序列中的先前帧和下一帧之间的差的时间局部差异。确定时间局部差异的分布。确定分布的特征值。将特征值与阈值进行比较以获得时间噪声估计的可靠性的指示。如果估计的噪声方差被确定为不可靠，则将其丢弃，并且将使用先前估计的可靠噪声方差来指示当前帧的噪声水平。

177. 发明申请

US20060221249A1 Dual-channel adaptive 2D noise reduction for video signals 失效
公开(公告)号：US20060221249A1
公开(公告)日：2006-10-05
申请号：US11094942
申请日：2005-03-30
申请人： Peng Lin , Yeong-Taeg Kim
发明人： Peng Lin , Yeong-Taeg Kim
IPC分类号： G06K9/40 , H04N5/00
CPC分类号： G06K9/40 , G06T5/002 , G06T5/20 , G06T2207/10016 , G06T2207/20012 , G06T2207/20192
摘要： A noise reduction system that not only preserves details in images but also provides essentially clean, smooth, and natural looking homogeneous regions in images. The noise reduction system utilizes a dual-channel adaptive noise reduction technique. The input signal is first split into two channels (i.e., a low-pass channel and a high-pass channel), by a channel splitting filter. Then the two channel signals are processed separately. The low-pass channel signal is processed using an adaptive directional filter based on the estimation of the local 2D and 1D statistics and the detection of the local image structure direction. The high-pass channel signal is processed by a non-linear filtering method based on the estimation of the local statistics and the noise level of the high-pass channel signal, which is derived from the noise level of the original input signal. The processed signals from the two channels are summed together to get the final output.

178. 发明申请

US20060176313A1 Luminance preserving color conversion from YUV to RGB 有权
标题翻译：亮度保持从YUV到RGB的颜色转换
公开(公告)号：US20060176313A1
公开(公告)日：2006-08-10
申请号：US11056372
申请日：2005-02-10
申请人： Ning Xu , Yeong-Taeg Kim
发明人： Ning Xu , Yeong-Taeg Kim
IPC分类号： G09G5/02
CPC分类号： H04N9/67
摘要： This invention presents a YUV to RGB conversion method which preserves high precision of luminance information in an original YUV image signal when converting it to RGB signal. The method can be used to convert the original YUV signal to arbitrary quantization levels in RGB space. In addition, this invention presents methods of pre-quantization and re-quantization as to compensate conventional YUV to RGB color conversion.
摘要翻译：本发明提出了一种YUV至RGB转换方法，当将其转换为RGB信号时，其保持原始YUV图像信号中的亮度信息的高精度。该方法可用于将原始YUV信号转换为RGB空间中的任意量化级别。此外，本发明提出了用于补偿常规YUV到RGB颜色转换的预量化和重新量化的方法。

179. 发明申请

US20060140268A1 Method and apparatus for reduction of compression noise in compressed video images 审中-公开
标题翻译：用于降低压缩视频图像中的压缩噪声的方法和装置
公开(公告)号：US20060140268A1
公开(公告)日：2006-06-29
申请号：US11025427
申请日：2004-12-29
申请人： Victor Ha , Yeong-Taeg Kim
发明人： Victor Ha , Yeong-Taeg Kim
IPC分类号： H04N11/04 , H04B1/66 , H04N11/02 , H04N7/12
CPC分类号： H04N19/86
摘要： A video processing method and system that obtains, transmits, and processes digital video compression rate information between a video receiver such as a Set-top-box (STB) and a display device such as a TV set. The compression rate information is obtained by the video receiver and delivered to a compression noise reducer in the display device. The compression rate information provides an indication of how much compression noise might be embedded into an incoming compressed video signal and thus allows the compression noise reducer to reduce compression noise from the incoming video signal more effectively and efficiently.
摘要翻译：一种在诸如机顶盒（STB）的视频接收机和诸如电视机的显示设备之间获得，发送和处理数字视频压缩率信息的视频处理方法和系统。压缩率信息由视频接收器获得并传送到显示装置中的压缩噪声减少器。压缩率信息提供了可以将多少压缩噪声嵌入到输入压缩视频信号中的指示，并且因此允许压缩噪声降低器更有效地有效地降低来自输入视频信号的压缩噪声。

180. 发明申请

US20060132499A1 Methods of suppressing ringing artifact of decompressed images 有权
标题翻译：抑制解压缩图像的振动神经的方法
公开(公告)号：US20060132499A1
公开(公告)日：2006-06-22
申请号：US11353851
申请日：2006-02-13
申请人： Yeong-Taeg Kim
发明人： Yeong-Taeg Kim
IPC分类号： G09G5/00
CPC分类号： H04N5/21 , G06T5/002 , G06T5/20 , G06T2207/20012 , G06T2207/20192 , G09G5/00 , G09G2320/02 , H04N19/117 , H04N19/136 , H04N19/176
摘要： A suppression method that provides adaptive (i.e., selective) processing of an input picture to generate an enhanced output picture with ringing-like areas of the input picture suppressed. For each such window in the input picture, if the window is detected as around a ringing-like area in the picture, then the output pixel for the position of the window comprises the low-pass filtered (i.e., smoothed) pixel in the input picture. However, if the window is not detected as around a ringing-like area (i.e., the window is around a non-ringing-like area) then the output pixel for the position of the window comprises essentially the unchanged window in the input picture. As a result no blurring is introduced into the input picture in areas where ringing-like patterns are not detected. Therefore, the output picture includes portions of the input picture in which ringing-like patterns were not detected, and portions of the input picture with suppressed ringing-like patterns where detected. The output picture is an enhanced version of the input picture with suppressed (i.e., smoothed) ringing-like patterns.
摘要翻译：提供输入图像的自适应（即选择性）处理以产生具有抑制输入图像的振铃状区域的增强输出图像的抑制方法。对于输入图像中的每个这样的窗口，如果窗口被检测为图像中的振铃状区域，则窗口位置的输出像素包括输入中的低通滤波（即平滑）像素图片。然而，如果窗口没有被检测为围绕振铃状区域（即，窗口在非振铃状区域周围），则窗口位置的输出像素基本上包括输入图像中的未改变的窗口。因此，在没有检测到振铃样式的区域中，在输入图像中不会引起模糊。因此，输出图像包括其中没有检测到振铃样图案的输入图像的部分以及检测到的具有抑制的振铃样图案的输入图像的部分。输出图像是具有抑制（即，平滑）振铃样图案的输入图像的增强版本。

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