Mobile Image Data Error Recovery via I Frame Request
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Solution Overview
Problem
Current mobile communication systems, such as WCDMA, face issues with abnormal image reproduction when errors occur during the transmission and reception of image data, leading to users viewing distorted images due to the reliance on I and P frames, where errors in P frames result in incomplete image data being decoded.
Innovation Solution
Classifying image data into two types - entire-image data and differential data - and implementing a method where the reception apparatus notifies the transmission apparatus of errors, generating and transmitting entire-image data (I frames) upon error detection, ensuring continuous normal image reproduction by requesting and receiving I frames when errors occur in P frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If P frames (differential image data) are used to reduce transmission data量 and improve transmission efficiency, then transmission efficiency is improved, but image reconstruction reliability deteriorates when errors occur during transmission
Solution Approach 1:
The transmitting apparatus proactively transmits I frames at predetermined intervals before errors occur, preparing complete image data in advance. This preliminary action ensures that when transmission errors occur in P frames, the receiver can reconstruct images using the most recent complete I frame, maintaining image reconstruction reliability while still using efficient P frames for normal operation.
Solution Approach 2:
The system transmits redundant I frames at predetermined intervals as a cushion against potential transmission errors. These periodically transmitted complete image frames serve as a safety buffer, ensuring that even if P frames are lost or corrupted, the receiver can recover by using the last received I frame, thus cushioning against reliability deterioration.
2Reliability
If I frames (entire image data) are transmitted frequently to ensure complete image data and improve reliability, then image reconstruction reliability is improved, but transmission data量 increases and transmission efficiency decreases
Solution Approach 1:
The transmitting apparatus transmits I frames at predetermined intervals rather than continuously or too frequently. This periodic transmission strategy ensures complete image data is available regularly for reliability, while avoiding excessive transmission of large I frame data that would reduce overall transmission efficiency. The receiver uses these periodically transmitted I frames as reference points for reconstructing subsequent images.
Data Source
AI summary
Disclosed is a method and apparatus for transmitting/receiving image data in a mobile communication system, in which image data are classified into two types of image data, a first type of image data corresponding to entire-image data in a current time period, a second type of image data being image data representing a difference between previous time-period image data and current time-period image data. A transmission side transmits image data to a reception side, and the reception side notifies the reception side of error occurrence of received image data when detecting the error occurrence on the received image data. When receiving the notification of the error occurrence, the transmission side generates the first type of image data and transmits the first type of image data to the reception side. The reception side receives generated the first type of image data from the transmission side and decodes the first type of image data.