Che Leng Tang

US Patent:

7738037, Jun 15, 2010

Filed:

Oct 29, 2004

Appl. No.:

10/976669

Inventors:

Che Wing Tang - Baldwin Park CA, US
Dung Duc Truong - El Monte CA, US

Assignee:

RGB Systems, Inc. - Anaheim CA

International Classification:

H04N 5/08
H04N 5/14
H04N 7/01
H04N 11/20

US Classification:

348441, 348607, 348448, 348452, 348458, 348700, 348 96

Abstract:

A method and apparatus for detecting and correcting motion artifacts in interlaced video signal converted for progressive video display. A correction is applied where interlaced video material is determined to originate from film source, thereby having been converted to video using a process known as 3-2 pulldown. Where the video material is not a result of the 3-2 pulldown process, a check is made for the presence of “pixel motion” so that corrections may be applied to smooth out the pixel motion. To determine 3-2 pulldown or field motion, a video field is compared to the field prior to the previous field to generate field error. Field errors are generated for five consecutive fields and a local minimum error repeated every five fields indicate the origination of the video material from film source using the 3-2 pulldown process. Upon confirmation of 3-2 pulldown, the video material is modified to correct for the mixing of two film frames into one interlaced video frame by assuring that the two fields of the de-interlaced video frame contain data from the same film frame. Where the video material did not originate from a film source, but pixel motion is detected, the pixel motion is smoothed out by an averaging method.

US Patent:

20020075412, Jun 20, 2002

Filed:

Dec 14, 2000

Appl. No.:

09/738281

Inventors:

Che Tang - Baldwin Park CA, US
Dung Truong - El Monte CA, US

International Classification:

H04N007/01
H04N005/21

US Classification:

348/607000, 348/441000

Abstract:

A method and apparatus for detecting and correcting motion artifacts in interlaced video signal converted for progressive video display. A correction is applied where interlaced video material is determined to originate from film source, thereby having been converted to video using a process known as 3-2 pulldown. Where the video material is not a result of the 3-2 pulldown process, a check is made for the presence of “pixel motion” so that corrections may be applied to smooth out the pixel motion. To determine 3-2 pulldown or field motion, a video field is compared to the field prior to the previous field to generate field error. Field errors are generated for five consecutive fields and a local minimum error repeated every five fields indicate the origination of the video material from film source using the 3-2 pulldown process. Upon confirmation of 3-2 pulldown, the video material is modified to correct for the mixing of two film frames into one interlaced video frame by assuring that the two fields of the de-interlaced video frame contain data from the same film frame. Where the video material did not originate from a film source, but pixel motion is detected, the pixel motion is smoothed out by an averaging method. The odd and even fields of the resulting video data are subsequently combined to form a progressive video material.