Video Signal Processing Device for Accurate Interpolation Frame Generation
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Solution Overview
Problem
Frame rate conversion techniques, such as those described in Japanese Unexamined Patent Application Publications 2008-118505 and 2006-304266, suffer from errors when incorrectly converted input video signals are used, leading to erroneous interpolation frames and deteriorated moving image quality, particularly when progressive signals obtained after IP conversion are subjected to frame rate conversion.
Innovation Solution
A video signal processing device and method that detects the accuracy of conversion in input frames, corrects pixels using motion information, and performs motion compensation to generate accurate interpolation frames by recalculating motion vectors and applying weighted averaging to ensure correct pixel information is used for interpolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frame rate conversion is performed on incorrectly converted input video signals, then the processing speed and frame generation capability are improved, but the image quality and accuracy of interpolation frames deteriorate due to error propagation
Solution Approach 1:
The patent applies preliminary action by detecting conversion accuracy and correcting pixel errors in the input frames before performing frame rate conversion. The correction unit corrects erroneous pixels in the first and second frames using motion information and weighted averaging, ensuring that the interpolation frame generation process starts with accurate source data, thereby preventing error propagation while maintaining high frame generation capability
Solution Approach 2:
The patent implements feedback by using the detected conversion accuracy information to guide the correction process. The accuracy detection unit provides feedback about which pixels are erroneous, and this feedback is used by the correction unit to selectively correct only the affected pixels using weighted averaging based on motion vectors, thus improving interpolation frame accuracy without compromising processing efficiency
2Productivity
If motion compensation is performed using erroneous pixel information from incorrectly converted frames, then the processing efficiency is maintained, but the reliability of the generated interpolation frames deteriorates
Solution Approach 1:
The patent applies preliminary action by correcting pixel errors in the input frames before motion compensation is performed. The correction unit uses weighted averaging with motion vectors to replace erroneous pixels with corrected values derived from adjacent pixels and motion information, ensuring that the subsequent motion compensation process operates on reliable data while maintaining processing efficiency
Solution Approach 2:
The patent introduces an intermediary correction process between the input frames and the motion compensation stage. The correction unit acts as an intermediary that filters out erroneous pixel information using weighted averaging based on motion vectors, allowing the motion compensation to proceed efficiently with reliable data without directly processing the raw erroneous input
3Adaptability or versatility
If IP conversion is performed to convert interlaced signals to progressive signals, then the compatibility with progressive display devices is improved, but conversion errors occur that propagate through subsequent frame rate conversion processing
Solution Approach 1:
The patent applies preliminary action by detecting and correcting pixel errors that result from IP conversion before frame rate conversion is performed. The accuracy detection unit identifies pixels that are incorrectly converted during IP conversion, and the correction unit corrects these errors using weighted averaging with motion vectors, ensuring accurate pixel information is available for subsequent processing while maintaining compatibility with progressive display devices
Solution Approach 2:
The patent implements feedback by using accuracy detection information from the IP conversion process to guide corrections. The detection unit provides feedback about which pixels are incorrectly converted, and this feedback enables the correction unit to selectively correct only the erroneous pixels using weighted averaging, thus restoring pixel information accuracy while preserving the benefits of IP conversion for display device compatibility
Data Source
AI summary
A video signal processing device includes: a correction unit which performs correction such that when a first frame to be displayed at a first time includes a pixel different from a pixel to be included in the first frame, the pixel different from the pixel to be included in the first frame is corrected to the pixel to be included in the first frame, and when a second frame to be displayed at a second time prior to the first time includes a pixel different from a pixel to be included in the second frame, the pixel different from the pixel to be included in the second frame is corrected to the pixel to be included in the second frame; and a motion compensation unit which generates an interpolation frame to be displayed at a time between the first and second times by referring to the first and second frames.