A scan method comprising a sensing photo module applicable in a scan apparatus for scanning a document is disclosed. The sensing photo module is equipped with photo sensors parallel to each other and detects the photo signal at every collection distance. The photo sensors extend horizontally and are positioned a line distance between the adjacent photo sensors. Under low operating resolution, the vertical resolution is increased by making the line ratio an integer, in order to solve the problem of color-quality loss due to a non-integer line ratio.
1. A method comprising:
determining an adjusting multiplier for a scanning device having an operating resolution, the adjusting multiplier determined based at least in part on a ratio of the line distance between a first and a second photo sensor of the scanning device and a collection distance of the scanning device; and
determining a vertical resolution based at least in part on multiplication of the operating resolution of the scanning device and the determined adjusting multiplier.
2. The method of claim 1 , wherein said first photo sensor comprises a red photo sensor and said second photo sensor comprises a green photo sensor.
3. The method of claim 1 , wherein said first photo sensor comprises a green photo sensor and said second photo sensor comprises a blue photo sensor.
4. The method of claim 1 , wherein said first and second photo sensors comprise charged-coupled devices (CCD).
5. The method of claim 1 , wherein the line distance between the first and the second photo sensor of the scanning device comprises a line ratio, and said line ratio is substantially proportional to said operating resolution.
6. The method of claim 1 , wherein said adjusting multiplier is greater than or equal to one.
7. A scanning apparatus, comprising:
a housing;
a document window disposed on the housing; and
a sensing photo module disposed in the housing, comprising an array of photo sensors separated by a distance, wherein the array of photo sensors comprise a plurality of lines of photo sensors and wherein a first and a second photo sensor of the array are disposed on different lines, wherein the sensing photo module is adapted to be moved from a first location to at least a second location with respect to the document window;
wherein the scanning apparatus is configured to:
adjust a vertical resolution of the scanning apparatus based at least in part on an adjusting multiplier, wherein the adjusting multiplier is based at least in pan on a ratio of the line distance between the first and the second photo sensor of the scanning apparatus and a collection distance of the scanning apparatus; and
initiate a scanning operation utilizing a horizontal resolution and the adjusted vertical resolution.
8. The scanning apparatus of claim 7 , wherein the scanning apparatus further includes an operating resolution at least generally equal to the vertical resolution.
9. The scanning apparatus of claim 8 , wherein the horizontal resolution is substantially equal to said operating resolution.
10. The scanning apparatus of claim 7 , wherein the scanning operation is initiated in response to manual selection by a user.
11. The scanning apparatus of claim 7 , wherein the vertical resolution is adjusted to result in a position on a document being scanned by at least two of the array of photo sensors.
12. The scanning apparatus of claim 7 , wherein the line ratio comprises the line distance between the first and the second photo sensor of the scanning apparatus.
13. The scanning apparatus of claim 7 , wherein said array of photo sensors comprises an array of Complementary Metal-Oxide Semiconductor (CMOS) photo sensors.
14. The scanning apparatus of claim 7 , wherein the adjusting multiplier is determined such that the product of the adjusting multiplier and the line ratio comprises a whole number.
15. The scanning apparatus of claim 7 , wherein adjusting the vertical resolution of the scanning apparatus based at least in part on the adjusting multiplier comprises multiplying the vertical resolution by the adjusting multiplier.
16. The scanning apparatus of claim 7 , wherein at least one of said photo sensors comprises a red photo sensor and at least one of said photo sensors comprises a green photo sensor.
17. The scanning apparatus of claim 7 , wherein at least one of said photo sensors comprises a green photo sensor and at least one of said photo sensors comprises a blue photo sensor.
18. The scanning apparatus of claim 7 , wherein said array of photo sensors comprise a charged-coupled device (CCD).
19. The method of claim 1 , further comprising scanning a document to obtain image data substantially in accordance with said vertical resolution and a horizontal resolution, wherein the horizontal resolution is substantially equal to said operating resolution.
20. A system, comprising:
means for scanning a document, said means for scanning including a movable photo sensor module that contains lines of photo sensors;
means for identifying a calibration value that, when multiplied by a quotient of a first distance between the lines and a second collection distance associated with movement of the movable photo sensor module, produces an integer value; and
means for setting a vertical resolution for the scanning according to a product of the calibration value and an operating resolution associated with the scanning when the quotient is not a whole number.
21. The system of claim 20 , wherein the calibration value is greater than one.
22. The system of claim 20 , wherein the scanning is completed using the set vertical resolution.
23. The system of claim 20 , wherein the lines of photo sensors includes a line of red photo sensors, a line of green photo sensors and a line of blue photo sensors.
24. The system of claim 20 , wherein a horizontal resolution for the scanning is set to the operating resolution.
25. The system of claim 20 , wherein the quotient is a line ratio.
26. The system of claim 25 , wherein the line ratio is a non-integer value that, when multiplied by the calibration value, produces the integer value.
27. The system of claim 20 , further comprising means for setting the vertical resolution without using the calibration value when the quotient is the whole number.
28. The system of claim 20 , wherein, when the quotient is the whole number, the vertical resolution is set according to a velocity of the movable photo sensor module during scanning and a frequency of data collection of the movable photo sensor module during scanning, and without using the calibration value.