Dual-Imaging Medium Conveyance for Shape Estimation

The patent introduces an imaging device as an intermediary to capture images of the medium, which then serves as a basis for shape estimation. This intermediary approach allows the system to differentiate between plastic cards and multi-feed conditions by analyzing edge pixels and gradation values in the captured images, thereby improving detection accuracy without adding complex specialized sensors.

The patent replaces the ultrasonic wave-based detection system with an optical imaging-based system. Instead of using ultrasonic transmitters and receivers to detect medium characteristics, the system uses imaging devices to capture visual information, processes edge pixels and gradation values, and estimates medium shape. This substitution eliminates the misclassification issue while maintaining cost-effectiveness by using standard imaging components.

The patent segments the imaging task into two parts: capturing images of both surfaces of the medium. By obtaining images from both surfaces, the system can compare edge pixels and gradation values to more accurately estimate the medium shape, particularly for curved or warped media. This segmentation approach improves measurement precision without requiring overly complex single-surface imaging systems.

The imaging devices serve multiple functions: they capture images for shape estimation, provide data for multi-feed detection, and enable medium surface characterization. This multi-functionality reduces the need for separate specialized sensors and processing systems, thereby limiting the increase in device complexity while achieving improved shape estimation accuracy.