Anti motion blur display

• US 20030006991A1
• Filed: 06/14/2002
• Published: 01/09/2003
• Est. Priority Date: 06/18/2001
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: De Haan, Gerard, Klompenhouwer, Michiel Adriaanszoon
• Granted Patent: US 6,930,676 B2
• Time in Patent Office: Days
• US Class Current: 345/473
• CPC Class Codes: H04N 5/208 for compensating for attenuation of high frequency components, e.g. crispening, aperture distortion correction
• CPC Class Codes: H04N 5/21 Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
• CPC Class Codes: Y10S 348/91 Flicker reduction

Abstract

The invention relates to a method, a circuit arrangement and a display device which suppresses motion blur due to motion integration carried out along a motion trajectory on the image data. As in matrix type displays a motion trajectory is integrated by the viewer and/or the display, an inverse integration filtering of the video signal is carried out. To avoid de-blurring in image regions where not motion can be detected, or image detail is low and to avoid noise modulation, motion estimation as well as further image characteristics are used.

Claims

1. Method for reducing motion blur of images shown in display devices, in particular resulting from integration by the viewer of pixel intensities along the motion trajectory which can be interpreted as a low-pass filtering in the spatial domain, due to motion dependant spatial low pass filtering of image data along a motion trajectory, in which motion vectors depending on moving components of an input video signal are calculated,

in which filter coefficients depending on said motion vectors are calculated,

in which said input video signal is filtered depending on said filter coefficients providing a filtered video signal,

in which an output video signal is generated by combining said input video signal and said filtered video signal, and

in which images are generated on said display device depending on said output video signal,

characterised in that said input video signal is further filtered depending on image characteristics determining high spatial frequency properties of said video signal.

2. Method according to claim 1, characterised in that said image characteristics are image detail, and/or image contrast, and/or image texture, and/or a mean signal value, and/or a peak to peak value.

3. Method according to claim 1, characterised in that said input video signal is filtered by means of a high spatial frequency boosting filter depending on said filter coefficients

4. Method according to claim 1, characterised in that said input video signal is compared to said filtered video signal, that said compared video signal is filtered by a masking circuit, and that said output video signal is generated by combining said input video signal and said masked video signal.

5. Method according to claim 4, characterised in that said masking circuit provides a threshold masking to said compared video signal, that below said threshold said compared video signal is substantially suppressed, and that above said threshold said compared video signal is at least partially boosted.

7. Non-stroboscopic display device, in particular a Liquid Crystal Display (LCD), a Thin Film Transistor Display (TFT), Colour Sequential Display, or a Plasma Display Panel (PDP) comprising a circuit arrangement according to claim 6, or operated with a method according to claim 1 to 5.

6. Circuit arrangement for providing motion blur suppression to video displays, comprising motion calculating means for calculating motion vectors in a video signal, means for calculating filter coefficients depending on said motion vectors, first filtering means for filtering said video signal depending on said filter coefficients, and means for adding said filtered video signal to said input video signal,

characterised in that second filtering means for filtering said video signal depending on image characteristics determining high spatial frequency properties of said video signal are provided.