Method of alignment for multi-CCD and the apparatus of the same

• US 5,971,278 A
• Filed: 08/19/1997
• Issued: 10/26/1999
• Est. Priority Date: 08/19/1997
• Status: Expired due to Term

• Current Assignee: Tumbleweed Holdings LLC (Equitable IP Corporation)
• Original Assignee: Mustek Systems Incorporated
• Inventors: Tsai, Jenn-Tsair
• Primary Examiner(s): Le, Thien Minh
• Application Number:
  US08/914,232
• Time in Patent Office: 798 Days
• Field of Search: 235/462.11, 235/462.01, 235/462.1, 235/462.24, 235/462.25, 235/462.26, 235/462.27, 235/462.28, 235/462.29, 235/462.81, 235/439, 235/45 4
• US Class Current: 235/462.25
• CPC Class Codes: G06K 7/10722 Photodetector array or CCD scanning

Abstract

The present invention includes an alignment pad set in front of a plurality of charge couple devices. The alignment pad includes a plurality of alignment patterns formed on the pad. The signals detected by the CCDs are respectively fed to a multi-processor. The multi-processor is used to determine which CCD'"'"'s signal can be fed into next element. A correlated double sampling (CDS) is used to respond the detected signal and adjust dc gain of the detected signal, therefore generating adjusted image signal. A 3 to 1 R, G, B multiprocessor is connected to the CDS. An analogue to digital converter is respond the 3 to 1 R, G, B multiprocessor to convert adjusted image signal to a digital signal. Then, the image data is fed into an application specific integrated circuits (ASIC) to generate a plurality of collation datas.

Claims

1. An alignment apparatus for a scanning system having a plurality of charge coupled devices, said apparatus comprising:

a multiprocessor connected to said plurality of charge coupled devices;

a correlated double sampling (CDS) connected to said multiprocessor, wherein said multiprocessor is used to determine which signal detected by said charge coupled devices is fed into said correlated double sampling, said correlated double sampling responsive to said detected signal and adjusting dc gain of said detected signal for generating adjusted signal;

an analogue to digital converter responsive to said correlated double sampling to convert adjusted signal to a digital signal;

a post-processing element connected to said analogue to digital converter to generate an image data by processing said digital signal through highlight, shadow and Gamma correction;

an application specific integrated circuits (ASIC) connected to said post-processing element for generating a plurality of collation datas; and

an alignment pad set in front of said charge coupled devices for aligning said charge coupled devices.

2. The apparatus of claim 1, wherein said alignment pad further comprising:

a plurality of alignment patterns formed on said alignment pad, distances between each of said alignment patterns being equal such that said charge couple devices detecting at least one of said alignment patterns.

3. The apparatus of claim 2, wherein said alignment pattern comprises a first oblique line tilted at a first degree with respect to a horizontal line, first and second vertical lines being respectively connected to two ends of said first oblique line.

4. The apparatus of claim 3, wherein said first degree is about 45 degrees.

5. The apparatus of claim 2, wherein said alignment pattern comprises a first oblique line tilted at a first degree with respect to a horizontal line, a first vertical line being connected to one end of said first oblique line.

6. The apparatus of claim 5, wherein said first degree is about 45 degrees.

7. The apparatus of claim 1, further comprising a monitor for displaying said plurality of collation datas.

12. The method of claim 1, wherein said first degree is about 45 degrees.

8. A method of alignment of a plurality of charge couple devices for a scanning system, said scanning system comprising:

setting an alignment pad having a plurality of alignment pattern in front of said a plurality of charge couple devices, distances between each of said alignment patterns being equal such that said charge couple devices detecting at least one of said alignment patterns;

generating image signal of said a plurality of alignment pattern using said a plurality of charge couple devices scanning said alignment patterns; and

generating collation datas by responsive to said image signal for collation.

9. The method of claim 8, wherein said alignment pattern comprises a first oblique line tilted at a first degree with respect to a horizontal line, first and second vertical lines being respectively connected to two ends of said first oblique line.

10. The method of claim 9, wherein said first degree is about 45 degrees.

11. The method of claim 8, wherein said alignment pattern comprises a first oblique line tilted at a first degree with respect to a horizontal line, a first vertical line being connected to one end of said first oblique line.