Real time smart image scaling for video input

• US 20040183948A1
• Filed: 03/19/2003
• Published: 09/23/2004
• Est. Priority Date: 03/19/2003
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Rai, Barinder Singh, Lai, Jimmy Kwok Lap
• Application Number:
  US10/392,152
• Publication Number:
  US 20040183948A1
• Time in Patent Office: Days
• US Class Current: 348/581
• CPC Class Codes: G06T 3/4007 based on interpolation, e.g. bilinear interpolation image demosaicing G06T3/4015; edge-driven or edge-based scaling G06T3/403
• CPC Class Codes: H04N 5/45 Picture in picture , e.g. displaying simultaneously another television channel in a region of the screen
• CPC Class Codes: H04N 7/0135 involving interpolation processes interpolation-based image scaling G06T3/4007; interpolation for video coding H04N19/587, H04N19/59

Abstract

Data from a video source are downscaled prior to storage in memory. This results in using less memory to store the image, less bandwidth in transmitting the image to the memory and display, and a reduction in power consumption. Downscaling may use methods of interpolation and a combination of dropping pixels and lines from the original image. The device and method require no decompression of data.

Claims

1. A video image scaling device comprising:

a video image source outputting a fixed number of pixels per video frame corresponding to a video image;

a downscaling device which outputs some portion of said fixed number of pixels per video frame representing a reduced scale version of said video image;

a memory for storing said portion of said fixed number of pixels per video frame; and

a display for presentation of said reduced scale version of said video image.

2. The device according to claim 1 wherein said downscaling device outputs some portion of said fixed number of pixels per video frame by interpolation of said pixels.

3. The device according to claim 1 wherein said downscaling device outputs some portion of said fixed number of pixels per video frame by eliminating a portion of said pixels from said video image.

4. The device according to claim 1 wherein said downscaling device outputs some portion of said fixed number of pixels per video frame by eliminating entire lines of said pixels from said video image.

5. A method for scaling a video image for future display wherein downscaling of said video image is performed prior to storage into memory.

6. The method according to claim 5 wherein said downscaling is accomplished by interpolation of pixels within said video image.

7. The method according to claim 5 wherein said downscaling is accomplished by eliminating a portion of the pixels from said video image.

8. The method according to claim 5 wherein said downscaling is accomplished by eliminating entire lines of the pixels from said video image.

9. A video image scaling device for use with a video image source that outputs a fixed number of pixels per video frame corresponding to a video image, a memory, and a display, comprising:

a downscaling device that receives said fixed number of pixels per video frame corresponding to a video image from said video image source and outputs some portion of said fixed number of pixels per video frame representing a reduced scale version of said video image for storage in said memory;

said display being responsive to said portion of said fixed number of pixels per video frame stored in said memory for presentation of said reduced scale version of said video image.

10. The device according to claim 9 wherein said downscaling device outputs some portion of said fixed number of pixels per video frame by interpolation of said pixels.

11. The device according to claim 9 wherein said downscaling device outputs some portion of said fixed number of pixels per video frame by eliminating a portion of said pixels from said video image.

12. The device according to claim 9 wherein said downscaling device outputs some portion of said fixed number of pixels per video frame by eliminating entire lines of said pixels from said video image.