Image Synchronous Display via Differential Compression
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Solution Overview
Problem
Traditional network teaching systems face issues with slow and unsmooth image synchronous displaying due to excessive data transmission and manual screen interception, leading to buffering and potential missed content, especially when dealing with multiple student user terminals.
Innovation Solution
An image synchronous displaying method using JPEG compression, real-time monitoring, and multicast transmission over UDP protocol, which segments and transmits only necessary image data, automatically determines image changes, and discards expired data to ensure smooth and efficient content delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If video streaming and manual screen interception are used to transmit same screen data, then the teacher can control the transmission content, but the transmission speed becomes slow and buffering phenomena occur when there are excessive student user terminals
Solution Approach 1:
The system automatically monitors screen changes and determines what content needs to be transmitted without requiring manual teacher intervention. The image processing unit automatically compares current screen content with previous content and transmits only changed portions, enabling the system to serve itself rather than requiring continuous manual control while maintaining fast transmission speeds
Solution Approach 2:
The screen transmission is divided into differential updates rather than complete screen transmissions. The system segments the transmission into only the changed portions of the screen, reducing the overall data volume and transmission time while still delivering complete visual information to students
2Loss of information
If complete screen data is transmitted to ensure no content is missed, then content completeness is maintained, but network burden increases and transmission efficiency decreases
Solution Approach 1:
The system extracts and transmits only the changed portions of the screen content rather than complete screen data. The image processing unit identifies and extracts differential image data, which represents only the new or modified content, thereby maintaining information completeness while significantly reducing network burden and transmission energy consumption
Solution Approach 2:
The transmission parameter changes from sending complete screen images to sending only differential update data. This parameter change in the transmission content allows the system to maintain content completeness for updated areas while reducing overall data volume and network burden
3Ease of operation
If manual screen interception is used, then teachers can select specific content to transmit, but teachers may forget to intercept screens timely and students cannot determine whether they acquire timely screenshot images
Solution Approach 1:
The system automatically monitors screen changes and determines what content needs to be transmitted without requiring manual teacher intervention. The automatic monitoring mechanism ensures timely detection and transmission of screen changes, eliminating the reliability issues associated with manual interception while maintaining content control
Solution Approach 2:
The system provides feedback to both teachers and students about transmission status. Students can determine whether they have acquired timely screenshot images through the system's status indicators, and teachers receive feedback about what content has been transmitted, creating a closed-loop system that improves reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method achieves real-time, efficient, and intelligent image synchronous displaying, reducing network burden and improving the teaching experience by minimizing unnecessary data transmission and ensuring timely content delivery to student user terminals.
Implementation Method 1
Many compression standards of images and videos use Discrete Cosine Transform (DCT) transform such as Joint Photographic Experts Group (JPEG) and Moving Picture Experts Group (MPEG.)
Data Source
AI summary
A synchronous displaying method and a synchronous displaying apparatus are provided. An ability to transmit at any time is possessed by intercepting screen content at regular time and performing compression, which improves transmission effects and shortens transmission time. A comparison of the intercepted screen content and intelligent determining on the synchronous image is performed by using eigenvalues parsed and obtained during image compression. In addition, synchronous transmission is realized automatically without manual operations. Moreover, the transmission of repeated screen content is avoided to the greatest extent, which reduces storage pressure on student user terminals and ensures content comprehensiveness. Further, marking and judging on the screen image content improve the efficiency of student reviews. For example, students can directly see the last few pages of each blackboard-writing during reviews.