Frame Rate Converter Motion Vector Detection Accuracy
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Solution Overview
Problem
Existing frame rate conversion technologies face challenges in maintaining image quality during scaling and motion compensation, particularly when converting between different display schemes, as they often narrow the effective search range for motion vector detection, leading to difficulties in accurately detecting motion vectors and resulting in deteriorated interpolation frame quality.
Innovation Solution
A moving image frame rate converting apparatus that separates scaling and color format conversion into two stages: first performing color format conversion without scaling on the input image signal, followed by scaling after frame rate conversion, ensuring motion vector detection occurs before image size enlargement or non-linear scaling, thus maintaining an effective search range for accurate motion vector detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If scaling is performed before frame rate conversion, then image size is adjusted to match display requirements, but the effective search range for motion vector detection is narrowed leading to reduced detection accuracy
Solution Approach 1:
The patent applies preliminary action by performing color format conversion before scaling and frame rate conversion. This ensures that the motion vector detection is performed on the original scaled image data, maintaining the effective search range and detection accuracy. The color conversion is done in advance on the full-resolution image, avoiding the need to perform it after scaling which would compromise motion detection quality.
2Measurement precision
If motion vector detection is performed after non-linear scaling, then image size matches display requirements, but motion vector detection accuracy deteriorates due to reduced effective search range
Solution Approach 1:
The patent segments the image processing into distinct stages: color format conversion, scaling, and frame rate conversion. By separating these operations, the system performs motion vector detection on the original scaled image data before final display scaling, maintaining detection accuracy while still achieving the required display resolution through the segmented processing pipeline.
3Quantity of substance
If image size is reduced, then memory and data transfer requirements decrease, but motion vector detection accuracy may be compromised
Solution Approach 1:
The patent performs color format conversion and motion vector detection on the original full-resolution image data before any size reduction occurs. This preliminary processing ensures that motion vectors are calculated with maximum accuracy using all available image data, while the reduced-size images are only generated after the critical motion detection phase is complete.
Data Source
AI summary
According to one embodiment, when an input image signal is to be enlarged, a moving image frame rate converting apparatus performs, by a first image processing device for performing scaling and color format conversion on the input image signal before frame rate conversion, the color format conversion without performing the scaling, and performs, by a second image processing device for performing scaling on a post-conversion image signal after the frame rate conversion, the scaling so as to generate an output image signal.