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Apparatus and method for video communication

A technology of video communication and equipment, which is applied in the field of video communication equipment and video communication, and can solve the problems of heavy encrypted high-resolution video processing load, video leakage of a large number of non-specific users, and degradation of coding efficiency.

Inactive Publication Date: 2005-08-17
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, referring to the aforementioned Patent Document 1 above, the above scheme of performing encryption processing only on a specific layer still has the problem that the processing load increases depending on the amount of encrypted video data
Specifically, even when only specific layers are encrypted, the processing load required to encrypt high-resolution video is still significant
In addition, performing stronger encryption processing for higher security will further increase the processing load
[0010] In addition, with regard to the scheme of improving security by block order rearrangement disclosed in the above Patent Document 2, it is still possible to decode blocks individually, and thus there is still the problem that video in block units may be leaked to an unspecified large number of users
However, changing the coding order of the blocks will change the zerotree configuration, and this will lead to coding efficiency degradation
Also, when the technology disclosed in Patent Document 2 is applied to MPEG-4 FGS using DCT (Direct Cosine Transform) instead of wavelet transform, as described above, it will become easy to decipher the entire video, and privacy is not fully protected

Method used

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  • Apparatus and method for video communication
  • Apparatus and method for video communication
  • Apparatus and method for video communication

Examples

Experimental program
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Embodiment 1

[0056] FIG. 1 is a block diagram showing the configuration of a video transmission device according to Embodiment 1 of the present invention. The video transmission device 100 shown in Figure 1 has a video input 110, a base layer encoder 120, an enhancement layer encoder 130, a base layer decoder 140, a scan order determiner 150, a multiplexer 160, a video transmitter 170, and Scan list sender 180 .

[0057] The video input 110 receives video as input through an imaging device such as a surveillance camera, and outputs images constituting the input video to the base layer encoder 120 and the enhancement layer encoder 130 one by one.

[0058] The base layer encoder 120 generates a base layer video stream using images input from the video input 110 . More specifically, the base layer encoder 120 has a motion compensator 121 , a quantizer 122 , a coefficient scanner 123 , and a variable length encoder 134 . These components implement the following operations.

[0059] The moti...

Embodiment 2

[0153] Embodiment 2 of the present invention is characterized in that, once the scanning order of the orthogonal transform coefficients is determined, the scanning is not performed in a private mode in abnormal situations such as when an alarm occurs, and video playback is allowed for ordinary users without a scanning list.

[0154] FIG. 13 is a block diagram showing the configuration of a video transmission device according to Embodiment 2 of the present invention. In the video sending device shown in the figure, the same components as those in the video sending device shown in FIG. 1 are assigned the same reference numerals, and no further explanation is provided. The video transmission device 500 shown in Figure 13 has video input 110, base layer encoder 120, enhancement layer encoder 130, base layer decoder 140, scan order determiner 150a, multiplexer 160, video transmitter 170, scan list sender 180 , image recognizer 510 , and alert receiver 520 .

[0155] The image reco...

Embodiment 3

[0173] Embodiment 3 of the present invention is characterized in that specific blocks in the image, that is, those specified in the image recognition process or specified by the user, are scanned according to the scanning order of the specified privacy mode, and adopt, generate, and Send a different scanlist than the one used in normal privacy mode.

[0174] Fig. 18 is a block diagram showing the configuration of a video transmission device according to Embodiment 3 of the present invention. In the video sending device shown in the figure, the same components as in the video sending device shown in FIGS. 1 and 13 are assigned the same reference numerals as in FIGS. 1 and 13 and are not further explained. Video transmission device 700 shown in Figure 18 has video input 110, base layer encoder 120, enhancement layer encoder 130, base layer decoder 140, scan order determiner 150b, multiplexer 160, video transmitter 170, scan list sender 180 , image recognizer 510 a , and mode ch...

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PUM

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Abstract

The present invention improves confidentiality of video without incurring increased processing load. Coefficient scanner 123 scans the orthogonal transform coefficients of the base layer in scanning orders specified by scanning order determiner 150 . Coefficient scanner 133 scans the orthogonal transform coefficients of the enhancement layer in scanning orders specified by scanning order determiner 150 . When scanning is implemented in a privacy mode, scanning order determiner 150 determines the privacy mode scanning orders of the base layer and the enhancement layer individually and generates scan lists that indicate the scanning orders of the base layer and the enhancement layer respectively. Scan list transmitter 180 the scan lists of the base layer and the enhancement layer, generated in scanning order determiner 150 , to specific users alone.

Description

technical field [0001] The invention relates to a video communication device and a video communication method. More particularly, the present invention relates to a video communication device and video communication method for transmitting and receiving video data encoded by a layered encoding scheme. Background technique [0002] In recent years, video coding technology has achieved remarkable development. Currently, by using, for example, the JPEG (Joint Photographic Experts Group) scheme, the H.261 scheme, and the MPEG (Moving Picture Experts Group) scheme, it is possible to compress and encode video signals below a certain bandwidth, which makes it possible to easily transmit via a network Compressed encoded video. [0003] However, for sending video over a network where the transmission bandwidth is constantly fluctuating, such as the Internet, layered coding schemes are often used that allow adaptive bandwidth adjustment within the available bandwidth. Specifically,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/60H03M7/30H04N7/12H04N7/167H04N19/30H04N19/34H04N19/467H04N19/51H04N19/625H04N19/91H04N21/2343H04N21/2347
CPCH04N7/26351H04N19/00781H04N19/00278H04N21/234327H04N19/00248H04N19/00109H04N19/00448H04N19/0023H04N7/1675H04N21/2347H04N19/00545H04N19/129H04N19/162H04N19/167H04N19/176H04N19/36H04N19/46H04N19/61
Inventor 本田义雅市村大治郎
Owner PANASONIC CORP