Abstract: A nozzle and a furnace having the same are provided. The furnace has a high vacuum fitting used to assemble the nozzle to the furnace. The nozzle includes a first tube part and a second tube part connecting to the first tube part. In addition, an immobilization device is disposed on a surface of the first tube part. The immobilization device is corresponding to an o-ring of the high vacuum fitting and sheathed by the o-ring to steadily immobilize the nozzle to the furnace.

Abstract: A method for constructing a Gamma table to perform Gamma correction according to the Gamma table. First, select (2M+1) major sampling pixel data, which divide a Gamma curve into 2M major segments. Next, obtain the maximum difference between the n-th major sampling line and the n-th major Gamma segment; according to the maximum difference, select (2Rn?1) minor sampling pixel data from the n-th major Gamma segment. Last, store the Gamma corresponding relationship of all major and minor sampling pixel data in the Gamma table. The execution of Gamma correction includes the following steps. First, select the a-th major sampling pixel datum according to the first M bits of an input pixel datum. Next, select the b-th and the (b+1)-th minor sampling pixel data according to the (M+1)-th bit to the (M+Ra)-th bit of the input pixel datum. Finally, obtain the Gamma corresponding relationship of the input pixel datum via interpolation using the b-th and the (b+1)-th minor sampling pixel data.

Abstract: An image scanning apparatus with scan-starting point positioning function comprising a casing, a carriage and a calibration sheet is provided. Of which, the casing comprises a scan-platform used to place documents to be scanned, while the calibration sheet, which is fixed to the inner surface of the carriage and lies between the home line of the carriage and the upper wider margin of the scan-platform, comprises a hollowed-out mark completed through a punch-cutting manufacturing process. The mark can be defined using a predefined function set and has a reference point. After the carriage has moved to a scan line, the reference point can be located according to the intersection points between the mark scanned and the scan line accompanied by the predefined function set of the mark. Of which, the calibration sheet and the inner surface of the casing are of different levels of brightness.

Abstract: An apparatus for positioning a scanning starting point of an image scanning apparatus includes a platen, carriage, and a number of marks. The X-Y coordinate system defined by the platen has an X-axis defined by a first wide margin of the platen and a Y-axis defined by a first long margin of the platen. The carriage moves along the Y direction. The marks inside the image scanning apparatus indicate different Y coordinate values. The method for positioning a scanning starting point of an image scanning apparatus is as follows: the nearest mark to the document to be scanned is first chosen as a reference point. The vector from an image starting point of the document to be scanned to the reference point is then obtained. The carriage finally moves to the reference point chosen as a starting point and proceeds to scan.

Abstract: A scanning method for performing gamma corrections according to multiple gamma functions includes the steps of: scanning a document using a plurality of sensing member sets to obtain plural sets of front image signals, each sensing member set including a plurality of sensing members to sense light rays of the same color at the same time; loading a plurality of gamma functions, which corresponds to each sensing member set, from a memory; and correcting the plural sets of front image signals into plural sets of post image signals according to the gamma functions. The invention also provides a scanning device using the scanning method.

Abstract: A method for constructing a Gamma table to perform Gamma correction according to the Gamma table. First, select (2M+1) major sampling pixel data, which divide a Gamma curve into 2M major segments. Next, obtain the maximum difference between the n-th major sampling line and the n-th major Gamma segment; according to the maximum difference, select (2Rn−1) minor sampling pixel data from the n-th major Gamma segment. Last, store the Gamma corresponding relationship of all major and minor sampling pixel data in the Gamma table. The execution of Gamma correction includes the following steps. First, select the a-th major sampling pixel datum according to the first M bits of an input pixel datum. Next, select the b-th and the (b+1)-th minor sampling pixel data according to the (M+1)-th bit to the (M+Ra)-th bit of the input pixel datum.

Abstract: A method for calibrating an image generated from a scanner when scanning a document is provided. The scanner includes a housing having a transparent platform positioned on the housing for placing the document, a light-distributing device positioned above the transparent platform for projecting light on the document, a track positioned inside the housing parallel with a scanning direction of the scanner, and a scanning module movably positioned on the track for sensing the light passing through the document and generating a corresponding scan signal. The method includes amplifying or decaying the scan signal generated from the scanning module according to a position of the scanning module located on the track when the scanning module slides along the track to scan the document.

Abstract: An apparatus for positioning a scanning starting point of an image scanning apparatus includes a platen, carriage, and a number of marks. The X-Y coordinate system defined by the platen has an X-axis defined by a first wide margin of the platen and a Y-axis defined by a first long margin of the platen. The carriage moves along the Y direction. The marks inside the image scanning apparatus indicate different Y coordinate values. The method for positioning a scanning starting point of an image scanning apparatus is as follows: the nearest mark to the document to be scanned is first chosen as a reference point. The vector from an image starting point of the document to be scanned to the reference point is then obtained. The carriage finally moves to the reference point chosen as a starting point and proceeds to scan.

Abstract: An image scanning apparatus with scan-starting point positioning function comprising a casing, a carriage and a calibration sheet is provided. Of which, the casing comprises a scan-platform used to place documents to be scanned, while the calibration sheet, which is fixed to the inner surface of the carriage and lies between the home line of the carriage and the upper wider margin of the scan-platform, comprises a hollowed-out mark completed through a punch-cutting manufacturing process. The mark can be defined using a predefined function set and has a reference point. After the carriage has moved to a scan line, the reference point can be located according to the intersection points between the mark scanned and the scan line accompanied by the predefined function set of the mark. Of which, the calibration sheet and the inner surface of the casing are of different levels of brightness.