Abstract: A method of automatic white balance adjustment for a scanner is described hereinafter. First, a light source provides a white light to make the scanner scan a document and get an initial image of the document. Secondly, red, green and blue chromatic values of a background color are obtained in the initial image. Next, a factor is calculated based on the chromatic values and a calibration value which is stored in a calibration sheet. Lastly, the scanner automatically adjusts a brightness ratio of the red, green and blue lights of the light source according to the factor, and then rescans the document to get a final image which has a processed background color. Therefore, the final image having the background color close to white is in favor of identification. Furthermore, the adjustment is executed in the process of the scanner rescanning the document so that the step of executing adjustment by software can be eliminated.

Abstract: A method of automatic white balance adjustment for a scanner is described hereinafter. First, a light source provides a white light to make the scanner scan a document and get an initial image of the document. Secondly, get red, green and blue chromatic values of a background color in the initial image. Next, calculate a factor based on the chromatic values and a calibration value which is stored in a calibration sheet. Lastly, the scanner automatically adjusts a brightness ratio of the red, green and blue lights of the light source according to the factor, and then rescans the document to get a final image which has a processed background color. Therefore, the final image having the background color close to white is in favor of identification. Furthermore, the adjustment is executed in process of the scanner rescanning the document so that omits the step of executing adjustment by software.

Abstract: A system for real time image transmission and preview and a method thereof are applied on a scanner having a predetermined format therein, and an electrical device having a display module. The scanner scans a document in lines along a direction repeatedly according to the predetermined format. The scanner can promptly get an image and then wirelessly send the image out after each linearly scanning a part of the document. The electrical device wirelessly receives the predetermined format information and the image sent out by the scanner, and further edits a format of the image to fit in with the predetermined format so as to make the image capable of being displayed by the display module. Wherein the display module promptly displays the image thereon after each linearly scanning a part of the document along the direction and the image get thereby is received by the electrical device.