Dual Camera Video Preview Synchronization
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Solution Overview
Problem
Current portable electronic devices with dual cameras struggle to effectively display and record composite video content from both cameras, particularly in slow-motion mode, while maintaining real-time capture and playback synchronization.
Innovation Solution
The apparatus allows for simultaneous display of live video previews from both cameras, with one preview shown at real-time capture rate and the other at a slower rate, enabling user input to adjust temporal offsets and record composite video content with discontinuities for catch-up playback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If slow-motion playback is applied to selected video content, then playback smoothness is improved, but temporal synchronization with live preview deteriorates
Solution Approach 1:
The system pre-captures video content at a higher frame rate than the normal playback rate, storing additional frames in advance. When slow-motion playback is activated, these pre-captured frames are displayed sequentially, enabling smooth slow-motion playback without real-time generation delays. This preliminary capture of extra frames resolves the contradiction by providing a buffer of frames that can be displayed at reduced speed while maintaining temporal coherence with the live preview.
2Loss of information
If dual camera video content is displayed simultaneously, then video content completeness is improved, but display complexity increases
Solution Approach 1:
The display screen is divided into multiple independent regions, with each region dedicated to showing video content from a specific camera. The live preview from the first camera occupies one segment while the slow-motion playback from the second camera occupies another segment. This segmentation allows both video streams to be displayed simultaneously without interfering with each other, maintaining content completeness while managing display complexity through structured spatial organization.
Solution Approach 2:
The system transitions from temporal dimension manipulation to spatial dimension utilization by dividing the display area into multiple zones. Instead of trying to sequence or alternate between dual camera feeds in time, the invention displays them concurrently in different spatial locations on the screen. This dimensional shift resolves the contradiction by allowing complete video content display without increasing operational complexity, as each camera feed is handled independently in its own display segment.
3Speed
If real-time capture rate is maintained, then capture speed is improved, but playback synchronization in slow-motion mode deteriorates
Solution Approach 1:
The system dynamically changes the playback rate parameter based on the selected mode. During slow-motion playback, the playback rate is reduced below the capture rate, allowing multiple pre-captured frames to be displayed over an extended time period. The frame rate parameter is adjusted independently from the capture rate, enabling the system to maintain high capture speed while displaying content at a slower, more detailed playback speed. This parameter separation resolves the contradiction between capture speed and playback synchronization.
Data Source
AI summary
An apparatus configured to; based on first video content comprising video imagery being captured by a first camera of a device and second video content comprising video imagery being captured by a second camera of the same device, the first and second video content captured contemporaneously and based on a slow-motion-mode input selecting one of the first and second video content for playback in slow-motion, provide for simultaneous display of: a live, first preview comprising video imagery of a non-selected one of the first and second video content as it is captured and presented at a first play rate substantially equal to a capture rate at which the non-selected video content was captured; and a second preview comprising video imagery of the selected one of the first and second video content presented at a second play rate slower than a capture rate at which the selected video content was captured.