Graphics controller providing a motion monitoring mode and a capture mode

• US 20070031045A1
• Filed: 08/05/2005
• Published: 02/08/2007
• Est. Priority Date: 08/05/2005
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Rai, Barinder, Dyke, Phil
• Granted Patent: US 7,366,356 B2
• Time in Patent Office: Days
• US Class Current: 382/232
• CPC Class Codes: G09G 2320/103 Detection of image changes, e.g. determination of an index representative of the image change
• CPC Class Codes: G09G 2330/022 in absence of operation, e.g. no data being entered during a predetermined time
• CPC Class Codes: G09G 5/363 Graphics controllers

Abstract

A preferred embodiment is directed to an image processing device for receiving pixel data provided to the device as follows: it is grouped into frames, each pixel datum has an associated value, and first, second, and third pixel data correspond respectively to first, second, and third frames. The image processing device is adapted for processing the pixel data, and has a low-power motion monitoring mode and a capture mode. Further, the pixel data is preferably provided by a data source external to the device. The image processing device preferably includes a control unit for: (a) receiving the pixel data; (b) summing the values of the first pixel data to produce a first total value for the first frame; (c) summing the values of the second pixel data to produce a second total value for the second frame, and (d) causing the image processing device to process the third pixel data only if the difference between the first and second total values exceeds a threshold. If the difference between the first and second total values does not exceed the threshold, the third pixel data is discarded. Additionally, the image processing device preferably includes a memory, and the processing of the third pixel includes storing the third pixel data in the memory.

Claims

1. An image processing device for receiving and processing pixel data, the pixel data being grouped into frames, each pixel datum having an associated value, comprising:

a control unit for;

for receiving pixel data that are streamed from a data source external to the device, wherein a first, second, and third pixel data correspond respectively to first, second, and third frames,

summing the values of the first pixel data to produce a first total value for the first frame,

summing the values of the second pixel data to produce a second total value for the second frame,

causing the image processing device to process the third pixel data only if the difference between the first and second total values exceeds a threshold, and

causing the image processing device to discard the third pixel data if the difference between the first and second total values does not exceed the threshold.

2. The image processing device of claim 1, further comprising a memory, wherein the processing of the third pixel data includes storing the third pixel data in the memory.

3. The image processing device of claim 1, further comprising a data compression module for compression encoding the third pixel data, wherein the processing of the third pixel data includes compression encoding the third pixel data.

4. The image processing device of claim 1, wherein the control unit is further adapted for summing the values of the third pixel data to produce a third total value for the third frame, and for causing the image processing device to process a fourth pixel data corresponding to a fourth frame only if the difference between the first and third total values exceeds the threshold.

5. The image processing device of claim 1, further comprising an adjustor for adjusting the threshold.

6. The image processing device of claim 1, further comprising a graphics controller.

7. A method for receiving and processing pixel data, the pixel data being grouped into frames, comprising:

receiving first, second, and third pixel data from a data source, the first, second, and third pixel data corresponding respectively to first, second, and third frames;

summing values respectively associated with each pixel datum of the first pixel data to produce a first total value for the first frame;

summing values respectively associated with each pixel datum of the second pixel data to produce a second total value for the second frame;

determining a difference between the first and second total values;

processing the third pixel data only if the difference between the first and second total values exceeds the threshold; and

discarding the third pixel data if the difference between the first and second total values does not exceed the threshold.

8. The method of claim 7, wherein the step of processing includes storing the third pixel data.

9. The method of claim 7, wherein the step of processing includes compression encoding the third pixel data.

10. The method of claim 7, further comprising a step of selecting a threshold.

11. The method of claim 7, further comprising summing values respectively associated with each pixel datum of the third pixel data to produce a third total value for the third frame, determining a difference between the first and third total values, and processing fourth pixel data corresponding to a fourth frame only if the difference between the first and third total values exceeds the threshold.

12. The method of claim 7, wherein the method is performed remotely from the data source.

13. The method of claim 7, wherein each pixel datum includes a Y, U, and V component, and the associated value of each pixel datum is the Y component.

14. A graphics display system, comprising:

a host;

a display device;

a data source for providing pixel data, the pixel data being grouped into frames, each pixel datum having an associated value, wherein a first, second, and third pixel data correspond respectively to first, second, and third frames;

a graphics controller for receiving the pixel data from the data source, and for processing the pixel data, the graphics controller including;

a control unit for;

summing the values of the first pixel data to produce a first total value for the first frame,

summing the values of the second pixel data to produce a second total value for the second frame,

causing the graphics controller to process the third pixel data if the difference between the first and second total values exceeds a threshold, and

causing the graphics controller to discard the third pixel data if the difference between the first and second total values does not exceed the threshold.

15. The graphics display system of claim 14, wherein the data source is external to the graphics controller.

16. The graphics display system of claim 15, further comprising a memory, wherein processing of the third pixel data by the graphics controller includes storing the third pixel data in the memory.

17. The graphics display system of claim 16, further comprising a data compression module, wherein processing of the third pixel data by the graphics controller includes compression encoding the third pixel data.

18. The graphics display system of claim 14, wherein the graphics controller is further adapted for summing the values of the third pixel data to produce a third total value for the third frame, and for causing the graphics controller to process a fourth pixel data corresponding to a fourth frame if the difference between the first and third total values exceeds the threshold.

19. The graphics display system of claim 14, wherein each pixel datum includes at least two components, and the associated value of each pixel datum is one of the at least two components.

20. The graphics display system of claim 14, wherein the associated value of each pixel datum is the three least significant bits of the pixel datum.