Scanner capable of executing static calibration and compensation value adjustment method therefor

A scanner capable of executing a static calibration, comprising:

• a calibration piece;
• a memory having a compensation database, wherein a standard compensation data including plural standard compensation values and a predetermined compensation threshold value are stored in the compensation database;
• an image capturing unit including plural pixels and configured to scan and acquire the image information of the calibration piece and obtain an initial scanned pixel data including plural initial scanned pixel values of the plural pixels;
• and
• a processing unit connected with the image capturing unit and the compensation database, and comprising a static correction and compensation module, wherein the static correction and compensation module is executed to receive the initial scanned pixel data and generate a compensation offset-ratio data including plural compensation offset-ratio values of the plural pixels according to the initial scanned pixel data and the standard compensation data, wherein the compensation offset-ratio data has a first offset-ratio average, wherein plural selected pixels are determined according to the compensation offset-ratio data, the first offset-ratio average and the predetermined compensation threshold value, and a second offset-ratio average is obtained by removing the compensation offset-ratio values of the compensation offset-ratio data of the selected pixels, and plural replacement compensation values of the selected pixels are generated according to the second offset-ratio average and the respective standard compensation values of the standard compensation data of the selected pixels, wherein the initial scanned pixel data is transformed into a static compensation pixel data by replacing the initial scanned pixel values of the initial scanned pixel data of the selected pixels with the replacement compensation elements respectively.