Copy Control System for Video Signal Pixel Thinning
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Solution Overview
Problem
Current copy control systems for DVD disks prohibit copying of video signals with original picture quality, making it impossible to enjoy DVD movies on portable devices with small screens outdoors, while also failing to effectively reduce illegal copies.
Innovation Solution
A new copy control system that allows copying of video signals with significantly reduced picture quality, specifically allowing signals with half the number of pixels to be copied, enabling playback on portable devices while protecting copyright holder rights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copy control prohibits copying of video signals with original picture quality, then copyright protection is improved, but portability and usability on small displays deteriorates
Solution Approach 1:
The patent introduces a new copy control parameter that distinguishes between video signals based on their picture quality characteristics. Specifically, it prohibits copying of signals with high picture quality (equivalent to recording quality) while permitting copying of signals with degraded picture quality. This parameter change enables the system to simultaneously protect copyright for high-quality displays while allowing portability for small display devices.
Solution Approach 2:
The patent segments the copy control into different categories based on picture quality degradation levels. It creates a distinction between signals that maintain original picture quality (copy-prohibited) and signals that are sufficiently degraded (copy-permitted). This segmentation allows the copy control system to apply different rules to different signal types, resolving the contradiction between protection and portability.
2Reliability
If copy control prohibits all copying to reduce illegal copies, then copyright protection is improved, but legitimate use on portable devices is lost
Solution Approach 1:
The patent changes the copy control parameter from a binary copy-prohibit/copy-permit system to a differentiated system that considers picture quality degradation. By introducing picture quality as a distinguishing parameter, the system can permit copying for portable devices while maintaining protection for legitimate high-quality viewing, thus improving ease of operation for portable use without compromising copyright protection.
Solution Approach 2:
The patent introduces a selective copying mechanism that allows copying under specific conditions (when picture quality is sufficiently degraded) while prohibiting copying under other conditions (when picture quality is maintained). This selective copying approach enables legitimate use on portable devices while preventing illegal copying of high-quality content.
3Adaptability or versatility
If picture quality is reduced to half the number of pixels for copying, then portability is improved, but picture quality deteriorates
Solution Approach 1:
The patent uses picture quality degradation (reducing to half the number of pixels) as a controlled parameter change that enables portability. By accepting this deliberate reduction in picture quality for copied signals, the system achieves compatibility with portable devices while maintaining sufficient picture quality for acceptable viewing on small displays.
Solution Approach 2:
The patent applies different picture quality requirements to different usage scenarios. For portable device playback, it accepts degraded picture quality (lower pixel count) as appropriate for the local context of small displays. For original recording and high-quality viewing, it maintains high picture quality standards. This local quality approach resolves the contradiction between portability and picture quality.
Data Source
AI summary
By introducing a new copy control system into video signals subjected to picture quality restriction satisfactory only in small-sized PMP displays, a new business model in which copyrighters, consumers and makers can have mutual prosperity is created. “A new copy control rule of prohibiting a video signal output with a picture quality equivalent to that at time of recording from being copied, but permitting a video signal sufficiently degraded in picture quality as compared with time of recording to be copied” is added to the copy-never, copy-one-generation, and copy-free states belonging to the conventional copy control rule. The quality for which the copyrighter can permit copying corresponds to half the current number of DVD pixels. If a quality restricting scheme of thinning out pixels to half compared with time of recording is used, therefore, needs of consumers desiring to enjoy PMPs are satisfied while protecting rights of copyrighters.