Cadence Detection in Progressive Video Streams
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Solution Overview
Problem
Existing video processing technologies face challenges in accurately converting between different frame rates and cadences, particularly in restoring the original 24 frames-per-second progressive film sequence from interlaced video, due to uneven field distribution and the need for cadence detection to differentiate between film and video shot content.
Innovation Solution
An apparatus and method that includes a frame motion detector and cadence detector to analyze progressive frames, determine motion values, and generate cadence patterns, allowing for conversion of video streams to different cadences, including the use of re-configurable motion detection logic for both interlaced and progressive streams, and a frame-rate converter to adjust the cadence accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 24 Hz progressive film frames are converted to 60 Hz interlaced video using 3:2 pulldown, then compatibility with analog and digital televisions is improved, but the original frame sequence and cadence pattern are lost
Solution Approach 1:
The patent applies preliminary action by detecting the cadence pattern in the progressive video stream before conversion to interlaced format. The system analyzes motion values between consecutive progressive frames to identify the 3:2 pulldown pattern, then uses this detected information to guide the interlacing process, ensuring the original frame sequence can be recovered during reverse telecine operations.
2Measurement precision
If motion detection is performed on interlaced fields, then field motion can be determined, but the detection logic must be re-configured for progressive frames to detect frame motion
Solution Approach 1:
The patent implements dynamics by using re-configurable motion detection logic that can dynamically switch between analyzing interlaced fields and analyzing progressive frames. The system adapts its detection mode based on the input video format, allowing the same hardware or software logic to perform field-based motion detection for interlaced video or frame-based motion detection for progressive video, thereby maintaining measurement precision across different formats without permanent complexity.
Data Source
AI summary
Devices, methods, and other embodiments associated with cadence detection are discussed. In one embodiment, an apparatus analyzes a progressive video stream and determines a cadence pattern from the progressive video stream.