Line Scan Camera Timing Circuit for Row Mark Detection
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Solution Overview
Problem
Traditional optical mark recognition (OMR) devices using line-scan cameras face challenges in accurately detecting and processing marked data due to variations in the spacing of row marks, leading to inefficiencies in data extraction and image processing.
Innovation Solution
A system and method that employs a line-scan camera, a timing circuit, and a feed device to adjust the capture signal frequency based on the number of pixels between adjacent row marks, allowing for precise detection and compensation for growth or skew in scanned items, thereby improving data extraction accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed capture signal frequency is used in traditional line-scan camera systems, then the system structure is simple, but the accuracy of detecting row marks with variable spacing deteriorates
Solution Approach 1:
The patent applies dynamics by making the capture signal frequency variable rather than fixed. The timing circuit dynamically adjusts the frequency of capture signals based on the detected spacing between row marks, allowing the system to adapt to varying mark densities while maintaining detection accuracy. This resolves the contradiction by enabling high precision measurement without requiring a completely complex fixed-frequency system for each possible spacing scenario.
Solution Approach 2:
The patent implements feedback by using the detected row mark spacing information to adjust the capture signal frequency. The system measures the actual spacing between row marks, compares it to expected spacing, and feeds this information back to the timing circuit to modify the capture frequency accordingly. This closed-loop approach maintains high detection accuracy while managing system complexity through adaptive control.
2Measurement precision
If the capture signal frequency is dynamically adjusted based on row mark spacing, then the data extraction accuracy improves, but the processing time increases
Solution Approach 1:
The patent applies preliminary action by performing initial detection of row mark spacing and pre-adjusting the capture frequency before full data extraction begins. The system quickly identifies the spacing pattern in advance, sets the appropriate capture frequency, and then proceeds with efficient data collection. This reduces the overall processing time penalty by preparing the system in advance rather than adjusting continuously during data extraction.
Solution Approach 2:
The patent uses partial action by adjusting the capture frequency only to the extent necessary for accurate detection. Rather than continuously modifying parameters, the system makes discrete frequency adjustments based on detected spacing ranges, maintaining stable operation during data collection. This minimizes processing overhead while achieving sufficient accuracy for the application.
3Adaptability or versatility
If traditional fixed-frequency capture is used, then the system is easier to operate, but the ability to compensate for item growth or skew deteriorates
Solution Approach 1:
The patent applies self-service by enabling the system to automatically detect and compensate for spacing variations without requiring manual intervention. The timing circuit autonomously measures row mark spacing, calculates the appropriate frequency adjustment, and implements the correction. This maintains ease of operation by eliminating the need for users to manually configure or adjust parameters while achieving high adaptability to different scanning conditions.
Solution Approach 2:
The patent uses parameter changes by dynamically modifying the capture signal frequency parameter in response to detected spacing variations. The system monitors actual row mark positions and adjusts the frequency parameter to compensate for growth or skew in the scanned item. This automatic parameter adaptation provides versatility without complicating operation, as the system handles adjustments autonomously.
Data Source
AI summary
Systems and methods for extracting information from a scanned item having a plurality of regularly spaced row marks along at least part of a length of the scanned item are disclosed herein. The system can include a line scan camera that can generate a line of pixels of a portion of the scanned item in an imaging area; a feed device coupled to the line scan camera; and a timing circuit. The feed device can move at least a portion of the scanned item through the imaging area, and the timing circuit can provide a plurality of capture signals to the line scan camera. The timing circuit can vary a time interval between capture signals based on a number of pixels between adjacent row marks along at least a portion of the length of the scanned item.