公开(公告)号：US07408590B2

公开(公告)日：2008-08-05

申请号：US11120842

申请日：2005-05-02

Applicant: Qifan Huang ,  Yu T. Tian

Inventor： Qifan Huang ,  Yu T. Tian

IPC: H04N1/393 ,  H04N7/01

CPC classification number: G09G5/391 ,  G06T3/4038 ,  G09G2340/0407 ,  G09G2340/0442 ,  G09G2360/10 ,  H04N7/01 ,  H04N7/012 ,  H04N7/0122 ,  H04N7/0125 ,  H04N9/641

Abstract: Techniques for performing combined scaling, filtering, and/or scan conversion are disclosed that reduce that amount of line buffer space required in the overall design of a video processing system. In particular, coefficients from all or a sub-set of the scaling, filtering (smoothing/sharpening), and scan conversion filters are combined into one representative coefficient that can be applied in a single generic algorithm. Thus, implementation costs are reduced, particularly in system-on-chip implementations.

Abstract translation: 公开了用于执行组合缩放，滤波和/或扫描转换的技术，其减少了在视频处理系统的整体设计中所需的线路缓冲器空间量。 特别地，将来自缩放，滤波（平滑/锐化）和扫描转换滤波器的全部或子集的系数组合成可以在单个通用算法中应用的一个代表系数。 因此，降低了实施成本，特别是在片上系统实现方面。

公开(公告)号：US07376288B2

公开(公告)日：2008-05-20

申请号：US11949345

申请日：2007-12-03

Applicant: Qifan Huang ,  Li Sha

Inventor： Qifan Huang ,  Li Sha

IPC: G06K9/32 ,  G06K9/36 ,  H04N3/14

CPC classification number: H04N9/045 ,  G06T3/4015 ,  H04N2209/046

Abstract: A demosaic system and method that supports multiple CFA pattern inputs is disclosed. The demosaic system is capable of handling both RGB Bayer input and CMYG input and perform demosaic operations on both inputs to recover full-color images from the raw input images. The system uses a variable number gradient demosiac process. The process uses a 5×5 neighborhood of sensor pixel data centered at the pixel under consideration. The process calculates a set of gradients corresponding to different directions within the neighborhood of the sensor pixel data. A threshold value is determined and a subset of gradients is selected from the set of gradients that fall below the threshold value. The system calculates estimation values for the missing color value and the actual measured center pixel color value obtained from the sensor data on directions that are within the subset of gradients below the threshold. The system then determines the sum of the missing color estimation values and the sum of the actual center pixel color estimation values. The system interpolates the missing color value by using the average difference of the summed estimation values for the missing color and the summed estimation values for the actual center measured pixel value from the sensor data.

公开(公告)号：US07333678B1

公开(公告)日：2008-02-19

申请号：US10850778

申请日：2004-05-20

Applicant: Qifan Huang ,  Li Sha

Inventor： Qifan Huang ,  Li Sha

IPC: G06K9/32 ,  G06K9/36 ,  H04N3/14

CPC classification number: H04N9/045 ,  H04N2209/046

Abstract: A demosaic system and method that supports multiple CFA pattern inputs is disclosed. The demosaic system is capable of handling both RGB Bayer input and CMYG input and perform demosaic operations on both inputs to recover full-color images from the raw input images. The system uses a variable number gradient demosiac process. The process uses a 5×5 neighborhood of sensor pixel data centered at the pixel under consideration. The process calculates a set of gradients corresponding to different directions within the neighborhood of the sensor pixel data. A threshold value is determined and a subset of gradients is selected from the set of gradients that fall below the threshold value. The system calculates estimation values for the missing color value and the actual measured center pixel color value obtained from the sensor data on directions that are within the subset of gradients below the threshold. The system then determines the sum of the missing color estimation values and the sum of the actual center pixel color estimation values. The system interpolates the missing color value by using the average difference of the summed estimation values for the missing color and the summed estimation values for the actual center measured pixel value from the sensor data.

Abstract translation: 公开了一种支持多个CFA模式输入的去马赛克系统和方法。 德马赛克系统能够处理RGB拜耳输入和CMYG输入，并对两个输入进行去马赛克操作，以从原始输入图像中恢复全色图像。 系统使用可变数量梯度demosiac过程。 该过程使用在所考虑的像素的中心的传感器像素数据的5×5邻域。 该过程计算对应于传感器像素数据附近的不同方向的一组梯度。 确定阈值，并且从落在阈值以下的梯度集合中选择梯度子集。 系统计算从传感器数据获得的缺失颜色值和实际测量的中心像素颜色值的估计值，该方向在低于阈值的梯度子集内。 然后，系统确定缺失颜色估计值和实际中心像素颜色估计值之和的和。 系统通过使用缺失颜色的相加估计值与传感器数据中实际中心测量像素值的相加估计值的平均差来内插缺失色值。

公开(公告)号：US20060125835A1

公开(公告)日：2006-06-15

申请号：US11090465

申请日：2005-03-25

Applicant: Li Sha ,  Qifan Huang

Inventor： Li Sha ,  Qifan Huang

IPC: G09G5/36

CPC classification number: G09G5/395 ,  G09G5/391

Abstract: A video processing system configured with DMA latency compensation is disclosed. This compensation helps minimize or otherwise mitigate shortages of data to the display, thereby improving the quality of displayed video. A relatively small line buffer is used to stage data for video processing. Should an underflow of data occur (where the buffer reading process is ahead of the buffer writing process), data is read from the previous line buffer. This not only prevents shortages of data to the display, but also provides data that is more likely to be relevant to the actual scene being displayed (as compared to random data).

Abstract translation: 公开了配置有DMA等待时间补偿的视频处理系统。 该补偿有助于最小化或以其他方式减少数据到显示器的短缺，从而提高显示视频的质量。 使用相对小的行缓冲器来进行视频处理的数据。 如果数据发生下溢（缓冲区读取过程在缓冲区写入过程之前），则从前一行缓冲区读取数据。 这不仅可以防止显示数据的短缺，还可以提供更可能与正在显示的实际场景相关的数据（与随机数据相比）。