Dynamic Threshold Algorithm Adjustment for Variable Density Cotton Tuft Optical Sorting
Dynamic threshold algorithms adjust optical background baselines to mass density changes, maintaining contaminant detection while cutting good fiber loss.
Line Frequency
Operational Rate
Spatial resolution on a production line is defined by the frequency of data acquisition. In the context of digital imaging on a finishing line, line frequency represents the number of times per second the camera captures a single row of pixels across the width of the moving cloth. Synchronizing this rate with the conveyor speed ensures that the resulting image is neither stretched nor compressed.
This timing is critical for maintaining the geometric accuracy of the digital record.
Resolution Constraint
The clarity of the defect detection depends on how closely the captured lines are spaced along the length of the material. If the line frequency is too low, small faults like a single broken filament or a pinhole might pass between the scans without being recorded. High-speed looms running at several hundred picks per minute require very high frequencies to maintain adequate quality control.
Data Load
Increasing the capture rate places higher demands on the processing hardware. A high line frequency generates a massive volume of data for real-time analysis.
Technical Synchronization
Encoders mounted on the drive rollers provide the necessary timing pulses to keep the sensor in step with the fabric. Because the line frequency must adjust to any fluctuations in the motor speed, the system remains accurate during the acceleration and deceleration phases of the machine. Stable imaging is impossible without this tight integration between the mechanical movement and the optical sensor.