Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1998-09-04
2002-08-13
Christensen, Andrew B. (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C360S060000, C380S201000
Reexamination Certificate
active
06434322
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to recording and reproducing method and apparatus, processing apparatus, and recording medium for a video signal having copy control information including another information, that is, electronic watermark information and a copy generation management signal multiplexed or embedded on/in image data, especially, a video signal in order to control reproduction or recording of an original image or to clarify the source of the image.
2. Description of the Prior Art
Among the several methods for embedding electronic watermark (data hidden or embedded) information in a video signal, representative one is described in “Data Hiding Technique” in ITE Technical Report, Vol. 21, No. 31, pp. 3-8. Another conventional information embedding technique is described in Nikkei Electronics, No. 683, pp. 99-107, 1997. It is described that, in these conventional techniques, information different from that of an inherent video signal is embedded in a part of the video signal by using statistical characteristics of an image and a control signal showing the source of the inherent image and further determining whether the signal can be reproduced or not by using the embedded information upon reproduction is generated. In the conventional technique, information different from that of an inherent image is embedded in a part of the image by using statistical characteristics of the image and a control signal showing the source of the inherent image and further determining whether the signal can be reproduced or not by using the embedded information upon reproduction is generated.
Generally widely recognized copy control is carried out by “full copy inhibition” or “copy only once permission”. The latter is positioned as a copy generation management system (CGMS). In case of permitting copy only once, the signal is rewritten upon copy operation from “copy once permission” to “copy inhibition”.
The foregoing literatures, however, do not describe that copy control is performed by a combination of such a technique and electronic watermark information.
SUMMARY OF THE INVENTION
It is an object of the invention to provide recording and reproducing method and apparatus, processing apparatus, and recording medium for a video signal having copy control information, which can easily discriminate whether the signal is reproducible or not.
Another object of the invention is to provide recording and reproducing method and apparatus, processing apparatus, and recording medium for a video signal having copy control information such as electronic watermark information, copy generation management signal, and the like.
Further another object of the invention is to provide reproducing method and apparatus and processing apparatus for a video signal having copy control information, which can inhibit outputting of a reproduced signal when the copy control information is illegally operated.
Further another object of the invention is to provide reproducing method and apparatus and processing apparatus for a video signal which can perform copy control in consideration of copy generation management system by using copy control information included in a luminance signal of a video signal which is once recorded to VCR, video disk, or the like.
In a recording medium of the invention, a video signal, electronic watermark information which is embedded in the video signal and has copy control information, and a CGMS signal for copy control inserted into the video signal are recorded. The electronic watermark information can be obtained by changing a luminance value of a luminance signal in a predetermined position of a video signal. Preferably, a range of changing the luminance value of the luminance signal is set to a permissible alteration range. The CGMS signal is inserted into a region outside of a scan region of the video signal. Preferably, the CGMS signal is inserted into a region out of the scan region near a horizontal sync signal. Preferably, the CGMS signal is a signal of two or larger bits. The electronic watermark information has information of either copy free, copy-once-permission, or copy inhibition. The CGMS signal has information of either copy free, copy-once-permission, or copy inhibition.
A recording method according to the invention comprises: a step of forming electronic watermark information by embedding copy control information into the luminance signal by changing a luminance value in a predetermined position of the luminance signal; and a step of inserting a CGMS signal having copy control information into a region out of a scan region of the video signal.
A recording method according to the invention comprises: a step of calculating a visually durable range even when a luminance value of a luminance signal included in a video signal is changed; a step of generating electronic watermark information having copy control information by changing the luminance value of a luminance signal in a predetermined position within the calculated range; and a step of generating a CGMS signal which has copy control information and is inserted into a region out of a scan region of the video signal.
A recording method according to the invention comprises: a step of calculating a visually durable range even when a luminance value of a luminance signal included in a video signal is changed; a step of generating electronic watermark information having copy control information by changing the luminance value when the luminance value to be changed of the luminance signal in a predetermined position lies within the calculated range; and a step of generating a CGMS signal which has copy control information and is inserted into a region out of a scan region of the video signal.
A reproducing method according to the invention for reproducing electronic watermark information and a CGMS signal from a video signal including the electronic watermark information in which copy control information is embedded by changing a luminance value of a luminance signal and the CGMS signal having copy control information inserted into a region out of a scan region of the video signal from a recording medium and for controlling outputting of the video signal, the method comprises: a step of detecting the electronic watermark information; a step of detecting the CGMS signal; and a step of stopping the outputting of the video signal when the copy control information obtained from the electronic watermark information and the copy control information obtained from the CGMS signal lacks in rationality. Each of the electronic watermark signal and the CGMS signal has either copy inhibition information or copy-once permission information. Further, the method comprises a step of outputting and displaying the video signal by the copy-once permission information obtained from the electronic watermark information and the copy inhibition information obtained from the CGMS signal. The method further comprises a step of outputting and displaying the video signal by copy inhibition information obtained from the electronic watermark information and copy inhibition information obtained from the CGMS signal. The method further comprises a step of stopping the outputting of the video signal when the CGMS signal is not reproduced.
A reproducing method of the invention comprises: a step of discriminating the kind of a disk; and a step of stopping outputting of the video signal when the copy control information obtained from the electronic watermark information, the copy control information obtained from the CGMS signal, and the disk kind information lacks in rationality. The method further comprises a step of outputting the video signal when the disk is read only disk, the electronic watermark information is a copy-once-permitted signal, and the CGMS signal is a recording-once-permitted signal. The method further comprises a step of stopping the outputting of the video signal when the disk is a recordable disk, the electronic watermark information is a copy-once-permitted signal, and the CGMS s
Arai Takao
Kimura Hiroyuki
Takeuchi Toshifumi
Chieu Po-lin
Christensen Andrew B.
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