Dynamic Frame Rate Switching in Recording Apparatus
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Solution Overview
Problem
Conventional digital cameras struggle to capture moving images at both high speed and for long durations due to limitations in frame rate adjustment during recording, leading to buffer overflow or reduced image capture time, as existing recording formats cannot change frame rates intermediately.
Innovation Solution
A recording apparatus that generates and records two streams of moving image signals at different frame rates, allowing for dynamic frame rate adjustment during image capture by switching between them, using a digital camera with image input, audio input, stream generation, and recording means, along with an instruction mechanism to manage frame rate changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a high frame rate is used to capture high-speed objects, then the frame rate is improved, but the buffer overflows and limits single image capture time
Solution Approach 1:
The patent segments the recording process into multiple streams with different frame rates. The stream generating means creates a first stream at a first frame rate and a second stream at a second frame rate (faster than the first). This allows the system to capture high-speed moments at high frame rates while maintaining overall recording duration through lower frame rate sections, thereby resolving the buffer overflow limitation.
Solution Approach 2:
The patent introduces dynamic frame rate adjustment during recording. The instructing means can instruct a change-over of frame rate, and the stream generating means switches between the first and second streams based on this instruction. This dynamic switching enables the system to adapt frame rates in real-time, capturing high-speed moments when needed while extending overall capture time through normal frame rate sections.
2Adaptability or versatility
If frame rate is changed intermediately during image capture, then recording flexibility is improved, but the reproduced video cannot maintain desired frame rates
Solution Approach 1:
The patent segments the recorded video into distinct sections corresponding to different frame rates. The recording means records the first stream at the first frame rate and the second stream at the second frame rate as separate sections. This segmentation allows each section to be reproduced at its designated frame rate, maintaining reproduction accuracy while enabling flexible frame rate adjustment during capture.
Solution Approach 2:
The patent creates multiple copies of the moving image signal at different frame rates. The image generating means generates both a first moving image signal at a first frame rate and a second moving image signal at a second frame rate from the same input signal. This copying approach allows the system to preserve the original frame rate information in each stream, enabling accurate reproduction of each frame rate section while providing flexibility in frame rate adjustment.
3Device complexity
If a single stream is recorded at constant frame rate, then recording simplicity is maintained, but the ability to capture high-speed moments is limited
Solution Approach 1:
The patent segments the recording into multiple streams with different frame rates. The stream generating means creates a first stream at a first frame rate for normal capture and a second stream at a second frame rate (faster than the first) for high-speed moments. This segmentation enables the system to capture high-speed moments without complicating the overall recording format, as both streams are managed through a unified recording apparatus.
Solution Approach 2:
The patent changes the frame rate parameter dynamically during recording. The instructing means can instruct a change-over of frame rate, and the stream generating means adjusts the frame rate parameter by switching between the first and second streams. This parameter change approach allows the system to capture high-speed moments at high frame rates while maintaining simplicity in the recording format through unified stream management.
Data Source
AI summary
A recording apparatus has: a stream generating unit for generating a first stream constituted of a first moving image signal at a first frame rate and an input audio signal and a second stream constituted of a second moving image signal at a second frame rate faster than the first frame rate and a predetermined audio signal; a recording unit for recording the first and second streams; and an instructing unit for instructing a change-over of a frame rate, wherein in accordance with an instruction output from the instructing unit during recording the first stream, the stream generating unit outputs the second stream instead of the first stream, and the recording unit records the second stream output in response to the instruction by the instructing unit, instead of the first stream.