Method and system for promoting scanning speed

• US 7,420,715 B2
• Filed: 12/11/2001
• Issued: 09/02/2008
• Est. Priority Date: 12/11/2001
• Status: Expired due to Fees

• Current Assignee: Cedar Lane Technologies Inc.
• Original Assignee: Transpacific IP Group Limited
• Inventors: Wang, Kuo-Jeng, Chen, Chun-Jen
• Primary Examiner(s): Worku; Negussie
• Application Number:
  US10/011,711
• Publication Number:
  US 20030107779A1
• Time in Patent Office: 2,457 Days
• Field of Search: 358/1.15, 358/1.16, 358/474, 358/505, 358/513, 358/404, 358/442, 358/448, 358/412, 358/410, 358/409, 358/426.03, 358/444, 358/436, 358/486, 358/1.2, 382/319, 382/312, 382/318
• US Class Current: 358/474
• CPC Class Codes: H04N 1/00236 using an image reading or reproducing device, e.g. a facsimile reader or printer, as a local input to or local output from a computer image input to or image output from a computer via a network H04N1/00209
• CPC Class Codes: H04N 1/00241 using an image reading device as a local input to a computer input via network, e.g. network scanners H04N1/00225
• CPC Class Codes: H04N 1/32358 using picture signal storage, e.g. at transmitter H04N1/17 takes precedence
• CPC Class Codes: H04N 2201/0015 Control of image communication with the connected apparatus, e.g. signalling capability
• CPC Class Codes: H04N 2201/0049 By wire, cable or the like
• CPC Class Codes: H04N 2201/0462 for reducing inactive scanning periods, e.g. increasing speed of carriage during return movement

Abstract

In accordance with the present invention, a method and a system for promoting scanning speed are provided. The method comprises steps of determining a transmission rate of a transit interface, adjusting system clock responsive to the transmission rate of the transit interface to change a data generated rate, and scanning an original to generate data at the rate controlled by the system clock. The key aspect of the present invention is by adjusting system clock to change the data generated rate corresponding to the transmission rate of the transit interface. Therefore, in response to the transmission rate of the transit interface, the system clock is adjusted to produce the data at a rate that can reduce the possibility of memory buffer full leading to the reduction in the time wasting on start-stop processes and therefore promote the scanning speed without requiring the increase in size of a memory buffer.

Claims

1. A method comprising:

observing which one of a plurality of transmit interfaces is selected for transferring data between a scanner and a general purpose computer and, after observing which transmit interface is selected, identifying a predefined maximum data transfer rate associated with the observed transmit interface;

selecting a clock multiplier according to the identified predefined maximum transfer rate;

adjusting a scanning system clock of the scanner to control a data generation rate of the scanner, said adjustment performed by utilizing the selected clock multiplier; and

performing a scanning operation using the adjusted scanning system clock to generate scanning data at said data generation rate, the data generation rate corresponding to the identified predefined maximum data transfer rate.

2. The method according to claim 1, further comprising transmitting said scanning data from said scanner to said general purpose computer using the observed transmit interface.

3. The method according to claim 1, wherein said adjusting the scanning system clock comprises executing software instructions.

4. The method of claim 3, wherein the software instructions are embodied on hardware.

5. The method of claim 3, wherein the software instructions are embodied on firmware.

6. The method according to claim 1, wherein the selected data interface comprises a data interface selected from the group consisting of:

high-speed USB and full-speed USB.

7. The method according to claim 1, wherein the data generation rate is less than a default data generation rate for the scanner.

8. The method according to claim 1, further comprising:

accessing a plurality of predefined clock multipliers stored in a memory of the scanner, the predefined clock multiplier values associated with the plurality of transmit interfaces;

comparing the identified predefined maximum transfer rate to the stored and predefined clock multiplier values; and

selecting the clock multiplier according to the comparison.

9. The method according to claim 1, wherein said clock multiplier comprises a value selected from a plurality of predetermined values.

10. The method according to claim 1, wherein said adjusting said system clock comprises changing the frequency of said system clock to produce a data generation rate that is different than a default data generation rate of the scanner.

11. The method of claim 1, wherein adjusting the scanning system clock comprises adjusting the scanning system clock based at least in part on the identified predefined maximum transfer rate.

12. A scanning system comprising:

a plurality of data interfaces configured to provide data between a scanner and a host device;

a system clock generator circuitry configured to provide a plurality of different selectable system clocks;

selection circuitry configured to observe which one of a plurality of data interfaces is used to communicatively couple the scanner and the host device, the observed data interface associated with a predefined data transfer rate, the selection circuitry to select one of the different system clocks according to which data interface is observed; and

a scanning module to generate data at a rate based on the selected system clock.

13. The system according to claim 12, wherein the plurality of data interfaces comprises a data interface selected from the group consisting of:

USB, IEEE1394, EPP, and SCSI.

14. The system according to claim 12, wherein the predefined data transfer rate is a maximum theoretical transfer rate of an associated one of the data interfaces.

15. The system according to claim 12, wherein the selection circuitry is configured to select one of the different system clocks based solely on which data interface is observed.

16. The system according to claim 12, wherein said system clock generator circuitry further comprises:

a clock generator capable of generating a frequency, and

a component to select a frequency multiplier capable of multiplying said frequency by a plurality of multipliers to provide the plurality of different selectable system clocks.

17. A scanning module, comprising:

circuitry to identify which transmission protocol, or which version of a single transmission protocol, is to be utilized for transferring image data between the scanning module and a host device;

wherein the identified transmission protocol or transmission protocol version is associated with a predefined data transfer rate that is different than a predefined data transfer rate of one of the unselected transmission protocols or unselected transmission protocol versions;

the circuitry to configure a system clock according to which transmission protocol, or which version of the single transmission protocol, is identified; and

an image processor to generate the image data, wherein the image processor is adapted to generate said image data at a data generation rate based on the configured system clock.

18. The scanning module of claim 17, wherein said data interfaces comprises one or more data interfaces selected from the group consisting of:

USB, IEEE1394, EPP, and SCSI.

19. The scanning module of claim 17, wherein said associated system clock is adjusted in accordance with the data transmission rate of the selected data interface.

20. The scanning module of claim 17, further comprising a charge-coupled device (CCD).

21. The scanning module of claim 17, wherein said circuitry to configure the system clock comprises firmware.

22. The scanning module of claim 17, further comprising a memory buffer to store at least a portion of the generated image data prior to providing to a host device.

23. A system, comprising:

means for providing data between the system and a host device, the means for providing data operating according to one of a plurality of different predefined maximum transfer rates depending on which one of a plurality of transmit interfaces is utilized;

means for generating a plurality of system clocks, the system clocks corresponding to the different predefined maximum transfer rates;

means for selecting between the system clocks based on which one of the plurality of different predefined maximum transfer rates is utilized by the providing means; and

means for generating data at a rate based on the selection.

24. The system according to claim 23, wherein the plurality of different predefined maximum transfer rates includes a 12 Mbit/s maximum transfer rate and a 480 Mbit/s maximum transfer rate, and a first one of the system clocks is selected if the providing means operates according to the 12 Mbit/s maximum transfer rate and a second one of the system clocks having a frequency greater than the first one of the system clocks is utilized if the providing means operates according to the 480 Mbit/s maximum transfer rate.

25. The system according to claim 23, wherein the means for generating the system clocks further comprises:

means for generating a frequency; and

means for multiplying the frequency by a plurality of multipliers to generate the system clocks.

26. The system of claim 23, wherein the selecting means operates according to which one of the different predefined maximum transfer rates is utilized by the providing means and independently of an actual transfer rate utilized by the providing means.