Image Replay Apparatus Adaptive Request Signal Generation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image replay apparatuses face challenges in acquiring and replaying moving-picture streams from servers with varying network performance and functionality, particularly those that do not provide detailed information like I-picture position information for MPEG 2 systems.
Innovation Solution
An image replay apparatus that intermittently acquires and displays compressed image data as reference image data, generating a request signal for specific replay times and positions, allowing for special replay even from servers lacking detailed information, by using a first-replay-start-time acquisition section, request signal generation, transmission, storage control, and next-replay-start-time acquisition sections to manage and decode I picture data efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the apparatus requests detailed information (e.g., I-picture position information) from the server to enable special replay, then the replay precision and control are improved, but the compatibility with servers that cannot provide such information deteriorates
Solution Approach 1:
The apparatus performs preliminary actions by first checking whether the server provides detailed information before attempting to use it for precise replay positioning. This preliminary check allows the system to adapt its subsequent actions based on server capability, maintaining compatibility while optimizing for precision when available.
Solution Approach 2:
The replay control mechanism dynamically adjusts its behavior based on server response. When detailed information is available, the system uses precise positioning methods; when not available, it falls back to less precise but compatible methods. This dynamic adaptation resolves the contradiction between precision and compatibility.
2Speed
If the apparatus uses high network performance servers (50 Mbps or more) for acquiring moving-picture streams, then the data acquisition speed and replay quality are improved, but the cost and system complexity increase
Solution Approach 1:
The system changes operational parameters such as buffer size, fetch interval, and resolution based on the actual network performance of the server being used. This allows high-speed servers to operate at full capability while lower-speed servers can still function with adjusted parameters, resolving the contradiction between speed and complexity.
3Reliability
If the apparatus continuously monitors and adjusts replay parameters based on server performance, then the replay reliability is improved, but the processing load and time consumption increase
Solution Approach 1:
Instead of continuous monitoring, the apparatus performs periodic checks of server performance and adjusts parameters at defined intervals. This periodic approach maintains replay reliability through regular updates while reducing the processing load and time consumption associated with continuous adjustment.
Data Source
AI summary
According to one embodiment, a moving-picture-stream replay apparatus includes a first-replay-start time acquisition section which acquires, in accordance with a replay speed N, a replay start time that indicates a time elapsing from a leading portion of the moving-picture stream data, a transmission section which transmits, to a server, a request signal to request compressed image data corresponding to about 1 second of a replay time of the moving-picture stream data, a storage control section which stores, into a memory, part of the moving-picture stream data sent in response to the request signal, a transfer control section which transfers the reference picture data to a decoder, and a next-replay-start time acquisition section which computes a next replay start time after the reference picture data is transferred to the decoder.