Display Control Apparatus for Continuous Whiteboard Image During Signal Loss
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Solution Overview
Problem
Conventional electronic whiteboards disrupt conference progress by going blank when a video signal is stopped or a connection is disconnected, leading to an undesirable blank screen.
Innovation Solution
A display control apparatus that captures frame images of video signals, detects signal input, and generates a frame image for display when the signal is lost, ensuring continuous image display on the whiteboard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic whiteboard displays a video signal from a connected device, then the video can be displayed on the screen, but when the video signal is stopped or the connection is disconnected, the screen goes blank and hinders conference progress
Solution Approach 1:
The system captures and stores frame images from the video signal in advance before disconnection occurs. When the video signal is interrupted, the previously captured frame image is automatically displayed, avoiding a blank screen and maintaining continuous visual content during conferences.
Solution Approach 2:
A frame image buffer acts as an intermediary between the video signal input and the display output. When the video signal is disconnected, the buffer provides a fallback frame image to the display, ensuring continuous display functionality without requiring manual intervention.
2Reliability
If the electronic whiteboard captures and stores frame images continuously, then the display remains continuous during disconnection, but memory resources are consumed
Solution Approach 1:
Instead of continuously capturing and storing all video frames, the system only captures and stores the most recent frame image. This partial action approach maintains display continuity by having a fallback image ready, while significantly reducing memory consumption compared to storing the entire video sequence.
3Productivity
If the system automatically switches to displaying a captured frame image when video signal is lost, then the screen remains active during conferences, but the system complexity increases
Solution Approach 1:
The system automatically detects video signal status and switches to displaying captured frame images without requiring manual intervention. The signal detector monitors the video input and autonomously triggers the frame image display when disconnection is detected, improving conference efficiency while keeping the automation logic relatively simple.
Data Source
AI summary
A display control apparatus receives an input of a video signal from an input device and makes a control that causes a video to be displayed on a display apparatus. The display control apparatus includes a capturing unit (410) configured to capture image data that represents a frame image of the input video signal; a signal detector (420) configured to detect whether the video signal is input and issue an instruction to cause the display apparatus to display the video or the frame image on the basis of a result of the detection; and a control unit (400, 430, 440, 450, 460) configured to generate the frame image from the image data captured most recently to cause the display apparatus to display the generated frame image when it is detected that the video signal is not input and the control unit receives the instruction to cause the display apparatus to display the frame image.