Blackboard Image Capture Buffering for Erasure Detection
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Solution Overview
Problem
Existing technologies for recording information on blackboards are inefficient as they often capture unnecessary information due to the uncertainty of when the writer holds the eraser and the potential for incomplete recording if erasure starts before capturing can begin.
Innovation Solution
A system that buffers images of the blackboard, detects changes in writing information by comparing current and past images, and selectively records images before or after changes occur, such as deletion or addition, to minimize useless recording and ensure complete capture of written information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous recording of blackboard information is performed, then complete information capture is ensured, but memory capacity is wasted
Solution Approach 1:
The system performs preliminary detection of eraser contact with the blackboard surface before initiating recording. By detecting the contact state in advance through image processing, the system prepares to record only when necessary, avoiding continuous recording and thus saving memory capacity while ensuring complete capture of erasure-related information
Solution Approach 2:
The system continuously monitors the blackboard surface for eraser contact feedback. When the eraser is detected contacting the blackboard, the system activates recording; when contact ceases, recording stops. This feedback mechanism ensures complete information capture during erasure operations while avoiding unnecessary recording during normal writing or idle periods, optimizing memory usage
2Quantity of substance
If recording is triggered by eraser detection, then memory capacity is saved, but useless information may be recorded or insufficient information may be captured
Solution Approach 1:
The system performs preliminary detection of eraser contact with the blackboard surface before initiating recording. By detecting the contact state in advance through image processing, the system prepares to record only when necessary, avoiding continuous recording and thus saving memory capacity while ensuring complete capture of erasure-related information
Solution Approach 2:
The system continuously monitors the blackboard surface for eraser contact feedback. When the eraser is detected contacting the blackboard, the system activates recording; when contact ceases, recording stops. This feedback mechanism ensures complete information capture during erasure operations while avoiding unnecessary recording during normal writing or idle periods, optimizing memory usage
Data Source
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AI summary
There is provided an image archiving method for use with a writing target, comprising the steps of receiving a series of captured images of the writing target, detecting difference between first and second candidate received images separated by a predetermined period of time, where additive differences are indicative of writing and subtractive differences are indicative of erasure; upon detecting subtractive difference, temporarily retaining a last candidate image captured prior to the detection, and detecting whether the subtractive difference relative to the retained image exceeds a subtraction threshold amount; and if so, then storing the retained image.