Scanner and method thereof

Abstract

The scanning instrument includes optical assembly, power source, digital gain unit and timer. The optical assembly includes light sensing module for sensing N scanning lines of the file to be scanned, and outputs digital element image data. The power source for driving the optical assembly has position sensor for outputting position feedback signal corresponding the optical assembly. The digital gain unit is for gaining the digital element image data. The timer controls the digital element gaining operation based on the position feedback signal. The scanning method includes: setting K value as 1; driving the optical assembly to sense the K-th scanning line in the file to be scanned and outputting the K-th image data; calculating the K-th exposure time for the K-th scanning line and performing digital gain on the K-th image data; and judging whether K is smaller than N, incrementing 1 to K, if K is smaller than N and backing to the step of driving the optical assembly.

Description

technical field [0001] The present invention relates to a scanner and its scanning method, and in particular to a scanner with a power source capable of feedback control and its scanning method. Background technique [0002] With the advancement of technology, scanners have gradually become an indispensable image capture device for people. The motor is also an important device for driving the photo-sensing components for image capture. Since the DC motor has many advantages such as small size, low noise, low power consumption, and low cost, the scanner based on the DC motor has gradually become a new trend in the scanner market. [0003] Please refer to FIG. 1A , which shows a schematic structural diagram of a known DC motor-based scanner. The scanner 100 includes a scanning platform 110 , an optical module 120 , a DC motor 130 and an Application Specific Integrated Circuit (ASIC) 140 . The DC motor 130 is to drive the optical module 120 to move at...

AI Technical Summary

Problems solved by technology

[0007] However, in order to dynamically adjust the AFE gain value of the scanner disclosed in the above-mentioned patent, complex circuits such as gain control unit 186 must be added to the ASIC 180, and the AFE gain compensation is based on the exposure error of the previous scan line to compensate for the next scan line. The exposure of the scanning line, and it is susceptible to external interference during the gain process, so that accurate compensation cannot be made

In addition, the linearity of this kind of analog signal compensation is also poor

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