专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US06944226B1 System and associated method for transcoding discrete cosine transform coded signals 失效
标题翻译：用于对离散余弦变换编码信号进行代码转换的系统和相关方法
公开(公告)号：US06944226B1
公开(公告)日：2005-09-13
申请号：US09677901
申请日：2000-10-03
申请人： Wanrong Lin , Dennis Bushmitch , David Alan Braun , Raghuraman Mudumbai , Yao Wang
发明人： Wanrong Lin , Dennis Bushmitch , David Alan Braun , Raghuraman Mudumbai , Yao Wang
IPC分类号： H04N7/30 , H03M7/30 , H03M7/40 , H04N7/26 , H04N7/12
CPC分类号： H04N19/40
摘要： A method is provided for transcoding between video signals in two standards, DV and MPEG-2, each standard including discrete cosine transform (DCT) compressed signals. The each of the signals have macroblocks containing a plurality of DCT blocks. The DCT blocks are quantized according to respective quantization methods defined by the standards. The coefficients in each block are zigzag scanned, run-length coded and variable-length coded. The process variable-length decodes the coefficients and translates the quantized coefficients in the DV standard into quantized coefficients in the MPEG standard without fully dequantizing at least some of the DV coefficients and without performing an inverse DCT operation on any of the DCT coefficients. DV blocks that are encoded in a 248 format are translated into an 88 format before they are converted to MPEG-2 blocks. A method for transcoding from MPEG-2 to DV is also described. The MPEG-2 signals are intra-frame encoded, have a 4:2:2 chrominance format and an 88 frame-encoded block format. According to this method, converted 88 DV blocks that represent significant intra-field motion are converted from the 88 format to a 248 format. The method also controls which overflow coefficients in the DV signal are transcoded into corresponding coefficients in the MPEG-2 signal to control the data rate of the MPEG-2 signal.
摘要翻译：提供了一种用于在两个标准DV和MPEG-2的视频信号之间进行代码转换的方法，每个标准包括离散余弦变换（DCT）压缩信号。每个信号具有包含多个DCT块的宏块。根据标准定义的各种量化方法对DCT块进行量化。每个块中的系数被锯齿扫描，游程长度编码和可变长度编码。过程可变长度解码系数并将DV标准中的量化系数转换为MPEG标准中的量化系数，而不对DV系数中的至少一些进行完全去量化，并且不对任何DCT系数执行逆DCT操作。以248格式编码的DV块在转换为MPEG-2块之前被转换为88格式。还描述了从MPEG-2转换为DV的方法。 MPEG-2信号被帧内编码，具有4：2：2色度格式和88帧编码块格式。根据这种方法，表示重要的场内运动的转换的88个DV块被从88格式转换成248格式。该方法还控制DV信号中的溢出系数被转码为MPEG-2信号中的相应系数，以控制MPEG-2信号的数据速率。

2. 发明授权

US07502946B2 Using hardware to secure areas of long term storage in CE devices 有权
标题翻译：使用硬件来确保CE设备中的长期存储区域
公开(公告)号：US07502946B2
公开(公告)日：2009-03-10
申请号：US11038969
申请日：2005-01-20
申请人： Gregory M Perkins , David Alan Braun
发明人： Gregory M Perkins , David Alan Braun
IPC分类号： G06F11/30
CPC分类号： G06F21/6245 , H04L9/321 , H04L9/3226 , H04L9/3236 , H04L2209/80
摘要： A system includes long-term storage (e.g., flash memory) for storing sensitive data and critical components of a consumer electronic (CE) device such as an operating system (OS) kernel, private cryptographic key values, security applications, and firmware configurations, for example. Security hardware/software designates and restricts access to secured portions of long-term storage that contain the critical components. Requests for access to these secured portions are addressed by the security hardware/software, which authenticates a cryptographic authorization code received with the request. Read-write access to the secured portions is allowed for download and installation of, for example, a software or firmware upgrade if the cryptographic authorization code is authenticated.
摘要翻译：系统包括用于存储敏感数据的长期存储（例如闪速存储器）和诸如操作系统（OS）内核，专用密码值，安全应用和固件配置的消费电子（CE）设备的关键组件，例如。安全硬件/软件指定并限制对包含关键组件的长期存储的安全部分的访问。访问这些安全部分的请求由安全硬件/软件来解决，安全硬件/软件对用该请求接收的密码授权码进行认证。如果加密授权码被认证，允许对安全部分的读写访问进行下载和安装，例如软件或固件升级。

3. 发明授权

US06133944A Head mounted displays linked to networked electronic panning cameras 失效
标题翻译：头戴式显示器连接到网络电子平移摄像机
公开(公告)号：US06133944A
公开(公告)日：2000-10-17
申请号：US767752
申请日：1996-12-17
申请人： David Alan Braun , Lanny Starkes Smoot
发明人： David Alan Braun , Lanny Starkes Smoot
IPC分类号： H04N5/232 , H04N5/265 , H04N5/275 , H04N13/00 , H04N7/00
CPC分类号： H04N13/0207 , H04N13/0059 , H04N13/0239 , H04N13/0246 , H04N13/026 , H04N13/0296 , H04N13/044 , H04N13/0475 , H04N13/0477 , H04N13/0481 , H04N5/232 , H04N5/23203 , H04N5/265 , H04N5/275 , H04N13/0055 , H04N13/0289 , H04N13/0484 , H04N13/0497 , H04N19/597 , H04N2013/0088
摘要： A system (300) for combining a panning camera (308) with one or more displays (304), such as head-mounted displays, is provided. A panoramic view from an electronic panning camera may be provided to an electronic panning control circuit (510). The electronic panning control circuit may be responsive to a view selector (306), such as a head-tracker located on a user's HMD. The electronic panning circuit selects the desired portion of the panoramic view to send to the user's display. A stereoscopic, view providing for a depth-of-field effect simulating actual vision, stereo view is achieved by locating a first electronic panning camera (502) in an optically horizontally offset relation with a second electronic panning camera (504). An image splitter (510), such as a half silvered mirror, sends the same, slightly horizontally offset, to both cameras. Individually pannable views may be delivered to users via a communications network (312). One or more electronic panning cameras may output stereoscopic views to a communications network using high bandwidth lines (because the electronic panning cameras typically output a signal having a bandwidth equivalent to several video signals). The panoramic views may be received by local central offices (806) which include electronic panning circuits responsive to users' HMDs. The desired portions of the stereoscopic view may be extracted and sent to the user via conventional video bandwidth lines (because the selected views are typically equivalent to one or two video signals).
摘要翻译：提供了一种用于将平移摄像机（308）与一个或多个显示器（304）组合的系统（300），诸如头戴式显示器。可以将电子平移摄像机的全景图提供给电子摇摄控制电路（510）。电子平移控制电路可以响应于诸如位于用户HMD上的头部跟踪器的视图选择器（306）。电子摇摄电路选择全景视图的期望部分以发送给用户的显示。通过将与第二电子平移摄像机（504）的光学水平偏移关系的第一电子平移摄像机（502）定位，提供模拟实际视觉的景深效果的立体视图，立体视图。诸如半镀银镜的图像分离器（510）向两个照相机发送相同的稍微水平偏移。可以经由通信网络（312）将单独的可视化视图传送给用户。一个或多个电子平移摄像机可以使用高带宽线路将立体视图输出到通信网络（因为电子平移摄像机通常输出具有等于几个视频信号的带宽的信号）。全景视图可由当地中心局（806）接收，其中包括响应用户HMD的电子平移电路。可以通过常规视频带宽线提取立体视图的期望部分并将其发送给用户（因为所选视图通常等同于一个或两个视频信号）。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式