Video Signal Upscaling with Broadcast Adaptation and Fixed Network Parameters
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Solution Overview
Problem
Existing video signal processing devices experience a reduction in picture quality and an increase in quality difference during resolution changes due to the time required to switch interpolation filters, especially when dealing with broadcast and communication video signals.
Innovation Solution
A video signal processing device that adjusts parameters for up-scaling processes based on the type of signal (broadcast or communication) to maintain consistent picture quality, including setting a fixed parameter for communication signals and adapting to changes in broadcast signals, and emphasizes sharpness adjustment for communication signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the resolution of a broadcast video signal changes, then the up-scaling process can be optimized for the new resolution, but picture quality reduction occurs due to the time required to switch interpolation filters
Solution Approach 1:
The patent applies preliminary action by pre-setting multiple interpolation filters corresponding to different resolutions before resolution changes occur. When a resolution change is detected, the system has already prepared the appropriate filter in advance, eliminating the need to switch between filters during the transition and thus preventing picture quality reduction.
Solution Approach 2:
The patent changes the parameter of using multiple predetermined interpolation filters with different characteristics for different resolutions. Instead of using a single filter and switching between them, the system maintains multiple filters simultaneously and selects the appropriate one based on the current resolution, thereby maintaining continuous picture quality during resolution transitions.
2Device complexity
If a single interpolation filter is used for all resolutions, then the device complexity is reduced, but picture quality difference increases during resolution changes
Solution Approach 1:
The patent applies local quality by assigning different interpolation filter characteristics to different resolution scenarios. Each resolution level (e.g., HD, SD) has its own optimized interpolation filter with specific parameters tailored to that resolution, allowing each local case to receive the most appropriate processing rather than using a universal filter for all cases.
Solution Approach 2:
The patent introduces dynamics by making the interpolation filter selection adaptive to the current resolution. The system dynamically switches between different predetermined filters based on the detected resolution, allowing the filter characteristics to change according to the operational requirements while maintaining picture quality consistency.
3Manufacturing precision
If the up-scaling parameter is changed during resolution changes, then the picture quality can be optimized for the new resolution, but the transition causes visible quality difference
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple interpolation filters with different up-scaling parameters before resolution changes occur. When a resolution change is detected, the appropriate filter is already ready and can be immediately applied without transition delay, thus optimizing picture quality for the new resolution without visible quality differences during the transition.
Solution Approach 2:
The patent skips the intermediate transition process by directly applying the appropriate predetermined filter to the new resolution without going through a gradual parameter adjustment. This rushing through of the transition eliminates visible quality differences and reduces transition time while maintaining optimized picture quality.
Data Source
AI summary
A video signal processing device includes: an obtainer that obtains a first video signal through broadcast or through communication via a network; an expander that performs an up-scaling process of expanding the first video signal obtained, according to a first parameter which is set; and a processor that: (i) when the first video signal is a broadcast video signal obtained through the broadcast and a resolution of the first video signal has changed, changes the first parameter according to the resolution changed; and (ii) when the first video signal is a communication video signal obtained through the communication via the network, sets the first parameter for use in the up-scaling process by the expander to a fixed value.