Control method and system for flat-type scanner

Abstract

Disclosed is a control method for a flat-type scanner. The flat-type scanner comprises a photosensor, a step motor, a placing platform and a transparent support window, wherein the step motor is used for controlling the step speed of the photosensor, the transparent support window is arranged on the placing platform and used for placing targets to be scanned. The method comprises scanning a calibration scale to obtain a calibration image, wherein the calibration patterns formed by a plurality of auxiliary lines which are arranged at intervals are drawn on the calibration scale, and the plurality of the auxiliary lines are straight lines having same inclined angels with the transverse direction; calculating the transverse distance among first pixels belonging to a same auxiliary line portion along the transverse direction of two adjacent scanned lines in the calibration image; and adjusting the step speed of the photosensor according to the transverse distance. The invention further discloses a control system for the flat-type scanner.

Description

technical field [0001] The invention relates to a scanner, in particular to a control method and system for a flatbed scanner. Background technique [0002] The way a flatbed scanner acquires an image is to irradiate light onto the scanning target (such as paper) on the scanning platform, and the light is reflected back by a photosensitive device such as a charge-coupled device (CCD) or a contact image sensor (CIS). Receive and convert to digital signal. The photosensitive devices used in flatbed scanners generally scan line by line. After one line is scanned, the photosensitive devices are driven by the stepping motor to scan the next line. Therefore, the stepping speed of the photosensitive devices driven by the stepping motors must be the same The time required for the device to scan a line matches. In a flatbed scanner that uses open-loop control for the stepping motor, once the stepping motor is set by the factory or the user, it will be executed according to the set p...

AI Technical Summary

Problems solved by technology

The photosensitive devices used in flatbed scanners generally scan line by line. After one line is scanned, the photosensitive devices are driven by the stepping motor to scan the next line. Therefore, the stepping speed of the photosensitive devices driven by the stepping motors must be the same The time required for the device to scan a line matches. In a flatbed scanner that uses open-loop control for the stepping motor, once the stepping motor is set by the factory or the user, it will be executed according to the set parameters, and it cannot be controlled by the light sensor. The actual scan status of the device dynamically adjusts the speed of the stepper motor

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