Post processing displays with on-screen displays

• US 8,358,379 B1
• Filed: 03/17/2010
• Issued: 01/22/2013
• Est. Priority Date: 07/31/2009
• Status: Active Grant

• Current Assignee: Pixelworks Semiconductor Technology Company Limited
• Original Assignee: Pixelworks Incorporated
• Inventors: Woodall, Neil D.
• Primary Examiner(s): Harold, Jefferey
• Assistant Examiner(s): Huang, Sam
• Application Number:
  US12/726,150
• Time in Patent Office: 1,042 Days
• Field of Search: 348/563, 348/569, 348/584, 348/586, 348589-592, 348598-600
• US Class Current: 348/569
• CPC Class Codes: G06T 1/20 Processor architectures; Processor configuration, e.g. pipelining

Abstract

A method of processing on screen display data with an image post processor includes receiving a data stream from a video processor at a post processing device having at least one port, the data stream including on screen display data overlaid on a white background and the on screen display data overlaid on a black background, finding a difference between the on screen display data overlaid on white and the on screen display data overlaid on black, using the difference to determine a complement of an alpha blend value, performing image processing on the image data with the post processor by applying the complement of an alpha blend value to the image data to produce processed image data, and transmitting the processed image data and the on screen display data through a display port.

Claims

1. A method of processing on screen display data with an image post processor, comprising:

receiving a data stream from a video processor at a post processing device having at least one port, the data stream including on screen display data overlaid on a white background and the on screen display data overlaid on a black background;

separating the image data from the on screen display data;

finding a difference between the on screen display data overlaid on white and the on screen display data overlaid on black;

using the difference to determine a complement of an alpha blend value;

performing image processing on the image data with the post processor including applying the complement of an alpha blend value to the image data to produce processed image data; and

transmitting the processed image data and the on screen display data through a display port.

2. The method of claim 1, wherein receiving a data stream comprises receiving the image data and the on screen display data as separate frames.

3. The method of claim 1, wherein performing image processing includes merging the on screen display data with the processing image data to be displayed as one of either side-by-side or the on screen display data as an overlay of the image data.

4. The method of claim 1, wherein performing image processing further includes adding back in the on screen display data overlaid on the black background to the data to which the alpha blend complement has been applied.

5. The method of claim 1, wherein performing image processing comprises performing at least one of sharpness, de-interlacing, color enhancement or peaking before applying the complement of the alpha blend to the image data.

6. The method of claim 1, wherein performing image processing comprises scaling the image data separate from the on screen display data from an original resolution to a higher resolution.

7. The method of claim 1, wherein scaling the image data comprises scaling the image data form the original resolution of 320 pixels by 240 pixels to a higher resolution of 1920 pixels by 1080 resolution.

8. The method of claim 6, wherein performing image processing includes scaling the on screen display data by a factor of 2.

9. The method of claim 1, wherein the image processing includes processing the image data for three-dimensional display.