Virtual Grading Designation for Lumber Check Grader Accuracy
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Solution Overview
Problem
Human check graders face challenges in efficiently processing the high volume of information from automatic lumber grading systems, leading to errors in assessing board feature quality, resulting in incorrect monetary valuations due to time constraints and information overload.
Innovation Solution
The implementation of a virtual grading system that projects overlapping value ranges of successive standard rule-based grades onto boards, allowing check graders to assess whether the board exceeds the lower quality grade, thereby reducing errors by focusing on the most critical information and enabling accurate grading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If check graders review all standard rule-based grade information displayed on monitors, then grading accuracy improves, but the time required for decision-making increases beyond available time allocation
Solution Approach 1:
The system extracts only the critical virtual grade information from the complete set of standard rule-based grades and presents it to check graders. By taking out and highlighting only the most relevant grade designations that require human verification, the system enables graders to make accurate decisions without reviewing all available data, thus resolving the time-accuracy tradeoff.
Solution Approach 2:
The system applies different information presentation strategies to different grade ranges. Virtual grades are selectively applied to borderline cases where standard rule-based grades overlap, providing localized enhanced information only where needed. This allows check graders to focus their attention on specific critical areas rather than processing uniform information across all boards.
2Measurement precision
If check graders are presented with complete board feature quality information, then assessment accuracy improves, but information overload causes decision errors
Solution Approach 1:
The system extracts and presents only the essential virtual grade information that check graders need to make accurate assessments. By filtering out redundant or less critical data and highlighting only the overlapping grade ranges that require human judgment, the system prevents information overload while maintaining assessment accuracy.
Solution Approach 2:
Instead of presenting all standard grades and expecting graders to identify relevant information, the system inverts the approach by pre-processing the grade data to identify and present only the virtual grades that require verification. This inversion transforms information overload into focused, actionable information.
3Productivity
If automatic grading systems process boards at high speed, then productivity increases, but check graders lack sufficient time to verify grading accuracy
Solution Approach 1:
The system performs preliminary processing of board grades to identify virtual grades that require check grader verification before the boards reach the grader. By pre-identifying borderline cases and preparing virtual grade information in advance, the system enables check graders to quickly verify only necessary cases without losing productivity, as the critical information is ready when the grader needs it.
Solution Approach 2:
The virtual grade designation acts as an intermediary between the automatic grading system and the check grader. It translates complex standard rule-based grade ranges into a simplified verification task, allowing high-speed processing to continue while providing graders with focused information that enables rapid verification without compromising accuracy.
Data Source
AI summary
A method of improving board feature quality grading facilitates human check grader reaction to grading output. The method entails specifying, for application by an automatic grading system to the faces of boards passing through a scanning zone, a virtual grade expressed by a range of values that overlap values in two of successive standard rule-based grades representing higher and lower board feature qualities; producing a signal in response to detection of a board feature quality representing a virtual grade value of a board analyzed by the automatic grading system; indicating, in response to the signal, a virtual grading designation onto the board to alert a check grader to assess whether the board exhibits board feature quality that exceeds the lower board feature quality; and assigning to the board the standard rule-based grade representing the higher board feature quality whenever the check grader's assessment concurs with the virtual grade designation.