Video Processing

• US 20090002553A1
• Filed: 10/27/2006
• Published: 01/01/2009
• Est. Priority Date: 10/31/2005
• Status: Abandoned Application

• Current Assignee: Sony United Kingdom Limited (Sony Group Corp.)
• Original Assignee: Sony United Kingdom Limited (Sony Group Corp.)
• Inventors: Living, Jonathan
• Application Number:
  US11/909,175
• Publication Number:
  US 20090002553A1
• Time in Patent Office: Days
• US Class Current: 348/452
• CPC Class Codes: H04N 7/012 Conversion between an interlaced and a progressive signal for graphics images G09G2310/0229
• CPC Class Codes: H04N 7/014 involving the use of motion vectors motion estimation and compensation in video coding H04N19/51

Abstract

A video processing apparatus generates an output frame from two or more input images by deriving pixels to interleave between lines of pixels of a base field. The pixels are derived from one of: a first pixel generator generating a pixel value from one or more fields other than the base field, dependent on a respective motion vector having a sub-pixel resolution; or a second pixel generator generating a pixel value from other pixels of the base field. A spatial phase-correcting filter receives an input group of derived pixels including a current derived pixel, and generates an output phase-corrected current pixel value. A pre-compensation mechanism, operable if a pixel forming part of the derived pixels group has been generated by the second pixel generator, applies spatial phase alteration to approximate the phase of that pixel to the phase of the current derived pixel.

Claims

1. Video processing apparatus in which an output frame is generated from two or more input images by deriving pixels to interleave between lines of pixels of a base field, the pixels being derived from one of at least two pixel generators:

a first pixel generator arranged to generate a pixel value from one or more fields other than the base field, in dependence on a respective motion vector having a sub-pixel resolution; and

a second pixel generator arranged to generate a pixel value from other pixels of the base field;

the apparatus comprising;

a spatial phase-correcting filter arrangement which receives a group of derived pixels including a current derived pixel as an input, and generates a phase-corrected current pixel value as an output; and

pre-compensation means, operable if a pixel forming part of the group of derived pixels has been generated by the second pixel generator, to apply a spatial phase alteration to approximate the phase of that pixel to the phase of the current derived pixel.

2. Apparatus according to claim 1, in which the phase change applied by the spatial phase-correcting filter is a horizontal phase change.

3. Apparatus according to claim 1, in which the second pixel generator comprises a vertical half-band filter operable with respect to pixel values in the base field.

4. Apparatus according to claim 1, in which the input fields are fields of an input video signal and the output frame is a frame of an output video signal.

5. Apparatus according to any one of the preceding claim 1, in which the pre-compensation means is operable to use as inputs to the pre-compensation means only pixels derived by the second pixel generator.

6. Video processing apparatus according to claim 1, the apparatus being a scan conversion apparatus.

7. An video processing method comprising the steps of

generating an output frame from two or more input images by deriving pixels to interleave between lines of pixels of a base field, the pixels being derived from one of at least two pixel generation steps:

a first pixel generation step to generate a pixel value from one or more fields other than the base field, in dependence on a respective motion vector having a sub-pixel resolution; and

a second pixel generation step to generate a pixel value from other pixels of the base field;

applying a spatial phase-correcting filter arrangement which receives a group of derived pixels including a current derived pixel as an input, and generates a phase-corrected current pixel value as an output; and

if a pixel forming part of the group of derived pixels has been generated by the second pixel generator, applying a spatial phase alteration to approximate the phase of that pixel to the phase of the current derived pixel.

8. Computer software having program code which, when executed by a computer, is arranged to cause the computer to carry out a method according to claim 7.

9. A medium by which software according to claim 8 is provided.

10. A medium according to claim 9, the medium being a storage medium.

11. A medium according to claim 9, the medium being a transmission medium.