Calibration method of an image scanning system
AssigneeUmax Data Systems Inc.
InventorChui-Kuei Chiu
Life of this patent
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Abstract
A calibration method of an image scanning system is provided. Initially, differences between adjacent sensing values of a calibration plate are respectively determined and then stored in a memory. Alternately, a difference between a base value and each of the sensing values of the calibration plate is determined and then stored in the memory. When a normal scan action is executed, simultaneously reading each difference from the memory and adding to one corresponding sensing value of image information of an object obtained by the normal scan action. As a result, the memory volume for storing calibration data is reduced and the reading of calibration data is also facilitated.
Claims12
A calibration method of an image scanning system having an image reading device for reading image information, said image reading device having at least a linear sensor consisting of a plurality of photo-sensing elements, said calibration method comprising:
- reading image information from a calibration plate having a plurality of pixels at least in a row, wherein a sensing value of each said photo-sensing element of said image reading device corresponds to one of said pixels;
- determining a base value in accordance with said sensing values of said calibration plate;
- computing respective differences between said adjacent sensing values;
- storing said base value and said respective differences;
- and
- calibrating image information of an object captured by said image scanning system, wherein said base value is added to a first sensing value of the image information of said object and each sequential sensing value of the image information of said object is added by one of said respective differences corresponding thereto.
A calibration method of an image scanning system having an image reading device for reading image information, said image reading device having at least a linear sensor consisting of a plurality of photo-sensing elements, said calibration method comprising:
- reading image information from a calibration plate having a plurality of pixels at least in a row, wherein a sensing value of each said photo-sensing element of said image reading device corresponds to one of said pixels;
- determining a base value in accordance with said sensing values of said calibration plate;
- computing a difference between said base value and each of said sensing values of said calibration plate;
- storing said base value and said differences;
- and
- calibrating image information of an object captured by said image scanning system, wherein each sensing value of the image information of said object is added by said base value and one of said differences corresponding thereto.
Dependencies are inferred from the claim text.