3D Image Frame Encoding for Constant-Speed Reverse Playback
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Solution Overview
Problem
Achieving constant-speed reverse play in a moving picture experts group (MPEG) stream for high definition 3D images is challenging due to the complex referencing between left and right images, leading to discontinuities in the screen during reverse playback.
Innovation Solution
An image processing apparatus and method that includes a video receiver, decoding unit, encoding unit, and controller to receive and decode 3D image streams, encode and decode frames as I, P, and B frames, allowing for smooth constant-speed reverse playback by converting frames to I frames and maintaining reference independence between left and right images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If MPEG stream uses P frames and B frames for compression, then compression efficiency is improved, but reverse playback produces screen discontinuities
Solution Approach 1:
The system performs preliminary encoding of the first-eye image as an I frame before reverse playback. This pre-conversion to an independent frame type ensures that when reverse playback occurs, the frame can be decoded without relying on future frames, thereby preventing screen discontinuities while maintaining compression efficiency
Solution Approach 2:
The invention changes the frame type parameter of the first-eye image from P or B frame to I frame. This parameter change fundamentally alters the decoding dependency structure, making the frame self-contained and suitable for reverse playback without causing visual artifacts or discontinuities
2Manufacturing precision
If MPEG stream uses frame referencing between left and right images, then 3D image quality is improved, but reverse playback becomes complex and difficult to achieve
Solution Approach 1:
The system extracts the first-eye image from its dependent status and encodes it as an independent I frame. This separation removes the complex inter-frame dependencies that make reverse playback difficult, while the 3D image quality is preserved through proper encoding of both eye images
Solution Approach 2:
The invention segments the stereo image pair into independent encodable units by converting the first-eye image to an I frame. This segmentation allows each eye image to be processed and decoded independently during reverse playback, simplifying the overall system complexity while maintaining 3D quality
Data Source
AI summary
Provided are an image processing apparatus and an image processing method. The image processing apparatus includes: a video receiver which receives a stream including first- and second-eye images, the first-eye image being a P frame or a B frame; a decoding unit which performs a first decoding of the first- and second-eye images; an encoding unit which encodes the first-decoded first- and second-eye images; and a controller which controls the encoding unit to encode the first-eye image into an I frame, and controls the decoding unit to second decode the encoded the first- and second-eye images at a reverse playing.