Video scramble/descramble apparatus

• US 20040101137A1
• Filed: 11/19/2003
• Published: 05/27/2004
• Est. Priority Date: 08/12/1998
• Status: Active Grant

• Current Assignee: Shinichiro Koto, Tadaaki Masuda
• Original Assignee: Shinichiro Koto, Tadaaki Masuda
• Inventors: Koto, Shinichiro, Masuda, Tadaaki
• Granted Patent: US 7,072,470 B2
• Time in Patent Office: Days
• US Class Current: 380/201
• CPC Class Codes: G06T 9/004 Predictors, e.g. intraframe, interframe coding
• CPC Class Codes: H04N 21/2347 involving video stream encryption
• CPC Class Codes: H04N 21/4405 involving video stream decryption
• CPC Class Codes: H04N 21/44055 by partially decrypting, e.g. decrypting a video stream that has been partially encrypted
• CPC Class Codes: H04N 21/8358 involving watermark protecting executable software by watermarking G06F21/16; image watermarking in general G06T1/0021; watermarks inserted in still images for transmission purposes H04N1/32144; inserting watermarks during video coding H04N19/467
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58

Abstract

A video scramble apparatus has a scrambler for scrambling an input video signal, and a video encoder for performing interframe predictive coding of the video signal after scrambling, and the scrambler selects a frame, which is not used as a reference frame for interframe prediction in the video encoder, from the input video signal, and scrambles the frame by pixel replacing in units of slices within a predetermined vertical range or pixel replacing in units of n consecutive macroblocks within a predetermined horizontal range.

Claims

1. A video processing apparatus for an input video signal, comprising:

a random number generator to generate scramble key information;

a watermark generator to generate a watermark signal including the scramble key information concerning a previous video picture;

a multiplexer to multiplex the watermark signal on the input video signal to generate a multiplexed signal;

an encoder to encode the multiplexed signal to output encoded video data; and

a scrambler to scramble the encoded video data to generate scrambled video data.

2. The video processing apparatus according to claim 1, further comprising a descrambler to descramble the scrambled video data using the scramble key information concerning the previous video picture to generate a descrambled video signal.

3. A video processing apparatus for an input video signal, comprising:

means for generating scramble key information;

means for generating a watermark signal including the scramble key information concerning a previous video picture;

means for multiplexing the watermark signal on the input video signal to generate a multiplexed signal;

means for encoding the multiplexed signal to output encoded video data; and

means for scrambling the encoded video data to generate scrambled video data.

4. The video processing apparatus according to claim 3, further comprising means for descrambling the scrambled video data using the scramble key information concerning the previous video picture to generate a descrambled video signal.

5. A video processing method for an input video signal, comprising:

generating scramble key information;

generating a watermark signal including the scramble key information concerning a previous video picture;

multiplexing the watermark signal on the input video signal to generate a multiplexed signal;

encoding the multiplexed signal to output encoded video data; and

scrambling the encoded video data to generate scrambled video data.

6. The video processing method according to claim 5, further comprising means for descrambling the scrambled video data using the scramble key information concerning the previous video picture to generate a descrambled video signal.