Barcode Reader Image Sensor Tracking for Moving Objects
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Solution Overview
Problem
Camera-based barcode-reading devices face challenges in maintaining image quality when reading moving barcodes, particularly due to motion-induced image blur and distortion, especially with rolling shutter-type image sensors.
Innovation Solution
The implementation of an actuator and image processing module that adjusts the position and velocity of the image sensor or optical components to maintain alignment with the moving object, reducing relative velocity and minimizing image blur and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the camera captures images of moving objects during exposure time, then the barcode reading function is enabled, but image blur and distortion occur reducing image quality
Solution Approach 1:
The patent applies dynamics by making the image sensor movable to track the moving object. The sensor position is dynamically adjusted during the exposure period to maintain alignment with the object, allowing the system to capture clear images of moving objects without blur or distortion while preserving barcode reading functionality.
2Device complexity
If a rolling shutter-type image sensor is used, then the device complexity is reduced, but image distortion increases due to motion during exposure
Solution Approach 1:
The patent implements feedback control by continuously monitoring the position of the moving object and adjusting the image sensor position accordingly. The feedback mechanism uses the known motion characteristics of the object to predict and compensate for position changes during the rolling shutter exposure sequence, eliminating distortion while maintaining the simplicity of the rolling shutter sensor.
3Manufacturing precision
If the exposure time is extended to capture moving objects, then the image quality improves, but the relative motion between object and sensor increases causing more blur
Solution Approach 1:
The patent applies preliminary action by pre-positioning the image sensor to track the moving object before the exposure begins. The system calculates the object's trajectory and adjusts the sensor position in advance, allowing for longer exposure times without increasing relative motion blur, as the sensor remains aligned with the object throughout the extended exposure period.
Data Source
AI summary
The present disclosure describes techniques for improving image quality when a camera-based barcode-reading device is reading barcodes located on objects that are moving relative to the barcode-reading device. The techniques disclosed herein enable the image sensor in the barcode-reading device's camera to remain aimed at an object that is moving relative to the barcode-reading device while the camera is capturing an image of the object. Advantageously, the techniques disclosed herein can reduce image blur. In a barcode-reading device that includes a rolling shutter-type image sensor, the techniques disclosed herein can also reduce image distortion.