Methods and apparatus for image capture and decoding in a centralized processing unit

• US 6,947,612 B2
• Filed: 08/17/2001
• Issued: 09/20/2005
• Est. Priority Date: 09/29/2000
• Status: Active Grant

• Current Assignee: Hand Held Products Incorporated (Honeywell International Inc.)
• Original Assignee: Hand Held Products Incorporated (Honeywell International Inc.)
• Inventors: Helms, Gil W., Harper, Jeffrey D., Dobeck, Brian R.
• Primary Examiner(s): Mehta, Bhavesh M.
• Assistant Examiner(s): Kassa, Yosef
• Application Number:
  US09/932,148
• Publication Number:
  US 20020039457A1
• Time in Patent Office: 1,495 Days
• Field of Search: 382/282, 382/284, 382/307, 382/312, 382/233, 382/294, 382/305, 358/505, 358/538, 358/540, 358/450, 358/453
• US Class Current: 382/305
• CPC Class Codes: G06T 1/0007 Image acquisition

Abstract

An improved method and device for capturing image data benefits from having a single central processor execute the operating system, and the image capture, decode and processing programs. A method for capturing of image data comprises transmitting image data from an imager, assembling the image data, assigning a memory address to the assembled image data and transferring the assembled image data into system memory. This method is capable of central processing whereby the capturing of image data is executed via the main processor without having to invoke a dedicated processor or incorporate external components, such as additional PCBs, external digital signal processing or external data storage. Additionally, an imaging device comprises an image builder module that receives image data from the imager bus and assembles the data, and a transfer controller that initiates the image builder module and controls the transfer of image data into and out of memory.

Claims

1. A method for capturing and decoding barcode image data in an image capture device, the method comprising the steps of:

generating an image capture signal;

receiving, in response to the image capture signal, pixel data of an image;

assembling the pixel data into a plurality of image data blocks;

storing the assembled image data blocks in memory; and

decoding a barcode within the assembled image data blocks at a central processor, wherein the central processor executes the operating system and one or more application programs.

2. The method of claim 1, further comprising the step of assigning, at the central processor, in response to generation of the image capture signal, a memory address for an image.

3. The method of claim 1, wherein the step of assembling the pixel data into a plurality of image data blocks further comprises the step of invoking a transfer controller under control of the central processor.

4. The method of claim 3, wherein the step of assembling the pixel data into a plurality of image data blocks is further defined as being initiated upon receipt of a signal from the transfer controller.

5. The method of claim 3, wherein the step of assembling the pixel data into a plurality of image data blocks further comprises the step of invoking the transfer controller to coordinate transfer of the assembled image data blocks to memory.

6. The method of claim 3, wherein the step of assigning, at the central processor, in response to generation of the image capture signal, a memory address for an image further comprises the step of communicating the memory address via the transfer controller.

7. The method of claim 3, wherein the step of invoking a transfer controller further comprises invoking a programmable logic device.

8. The method of claim 1, wherein the step of assembling the pixel data into a plurality of image data blocks further comprises the step of invoking an image builder module to begin an image data assembly process.

9. The method of claim 8, wherein invoking an image builder module further comprises invoking a programmable logic device.

10. The method of claim 1, wherein the step of assembling the pixel data into a plurality of image data blocks further comprises the step of invoking a programmable logic device remote from the central processor.

11. The method of claim 1, further comprising the step of generating an end of frame signal after all image data blocks are stored.

12. The method of claim 1, further comprising the step of executing the application program after the barcode has been decoded.

13. The method of claim 1, wherein the step of storing the assembled image data in system memory further comprises gaining control of the data bus in communication with the image data assembler and the memory module and transferring assembled image data to system memory.

14. The method of claim 1, wherein the step of assembling the pixel data into a plurality of image data blocks further comprises the step of assembling the image data blocks under control of the central processor and an image builder module.

15. The method of claim 1, wherein the step of storing the assembled image data blocks in memory further comprises storing the assembled image data blocks in memory under control of the central processor or a transfer controller.

16. An imaging device for capturing and decoding barcode image data, the device comprising:

an imager for generating image pixel data;

an image data assembler in communication with the imager that receives image pixel data from the imager and assembles the pixel data into image data blocks;

a memory module in communication with the image data assembler that receives assembled image data blocks from the image data assembler and stores the assembled image data blocks; and

a central processor in communication with the memory module that executes a barcode decode routine on the stored image data blocks and executes a device operating system and one or more application programs.

17. The imaging device of claim 16, wherein the image data assembler comprises an image builder module that receives image pixel data.

18. The imaging device of claim 17, wherein the transfer controller invokes the image builder module in response to a signal from the central processor designating a memory address for the image data blocks that are to be assembled.

19. The imaging device of claim 16, wherein the image data assembler comprises a transfer controller that receives a signal from the central processor.

20. The imaging device of claim 19, wherein the transfer controller invokes an image builder module in response to a signal from the central processor.

21. The imaging device of claim 19, wherein the transfer controller comprises a programmable logic device.

22. The imaging device of claim 16, wherein the image data assembler comprises a programmable logic device.

23. The imaging device of claim 16, wherein the central processor, the image data assembler and the memory module are disposed on a single printed circuit board.

24. The imaging device of claim 16, wherein the image data assembler generates an end of frame signal after the image data blocks are assembled.

25. The imaging device of claim 16, wherein the image builder module comprises a programmable logic device.