# US 2013/0155319 A1 · Usage of dither on interpolated frames

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- Number: US 2013/0155319 A1
- Document ID: US20130155319A1
- Status: Published application
- Kind: A1
- Application number: 13/706,763
- Filed: 2012-12-06
- Published: 2013-06-20
- Earliest claimed: 2011-12-19
- Assignees: Sony Corporation
- Inventors: Michael ENENKL; Piergiorgio Sartor
- Web page: https://patentgrep.com/patent/US20130155319A1

## CPC

- H04N 7/0127: {by changing the field or frame frequency of the incoming video signal, e.g. frame rate converter}
- G09G 3/2044: {using dithering}
- H04N 7/014: {involving the use of motion vectors (motion estimation and compensation in video coding H04N19/51)}
- G09G 2340/0435: Change or adaptation of the frame rate of the video stream
- G09G 2340/0457: Improvement of perceived resolution by subpixel rendering
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

The present invention relates to an image processing method comprising providing video image frames with a first frame rate, up-converting said frame rate to provide video image frames with a second frame rate, and applying dithering to said video image frames with said second frame rate.

## Claims

### Claim 1

Image processing method comprising
providing video image frames with a first frame rate,
up-converting said frame rate to provide video image frames with a second frame rate, and
applying dithering to said video image frames with said second frame rate.

### Claim 2 (depends on 1)

Method of claim 1, wherein said video image frames with said second frame rate comprise interpolated image frames, and said applying dithering comprises applying a random dither to the interpolated video image frames.

### Claim 3 (depends on 1)

Method of claim 1, wherein said video image frames with said second frame rate comprise interpolated image frames, and said applying dithering comprises applying an inter frame dependent dither with correlation to video image frames.

### Claim 4 (depends on 1)

Method of claim 1, wherein said dithering is based on an error-diffusion algorithm.

### Claim 5 (depends on 4)

Method of claim 4, wherein said error-diffusion algorithm is the Floyd Steinberg algorithm.

### Claim 6 (depends on 1)

Method of claim 1, wherein said dithering is a temporal dithering applied over several subsequent frames.

### Claim 7 (depends on 1)

Method of claim 1, wherein said dithering is a spatial dithering applied in one frame.

### Claim 8 (depends on 1)

Method of claim 1, comprising
carrying out motion estimation for interpolating image frames, and
using information gained by said motion estimation for said dithering.

### Claim 9

Image processing system comprising
an image frame up-converting unit adapted to receive video image frames with a first frame rate and to output video image frames with a second frame rate higher than said first frame rate, and
a dithering unit receiving said image frames with said second frame rate and adapted to apply dithering to said image frames.

### Claim 10 (depends on 9)

System of claim 9, wherein said dithering unit comprises a noise generator adapted to apply a random value on the least significant bit of a pixel of the image frame.

### Claim 11 (depends on 10)

System of claim 10, wherein said noise generator is a blue noise generator.

### Claim 12 (depends on 9)

System of claim 9, wherein said dithering unit comprises an error-diffusion element.

### Claim 13 (depends on 12)

System of claim 12, wherein said error-diffusion element is a Floyd-Steinberg error-diffusion element adapted to carry-out the Floyd-Steinberg algorithm.

### Claim 14 (depends on 9)

System of claim 9, wherein said image frame up-converting unit comprises a motion estimation unit used to interpolate image frames.

### Claim 15 (depends on 1)

Computer readable non-transitory medium having instructions stored thereon which, when carried out on an image controller, cause the image controller to perform the steps of the method as claimed in claim 1.