DE-INTERLACING APPARATUS, DE-INTERLACING METHOD, AND VIDEO DISPLAY APPARATUS

• US 20090167937A1
• Filed: 11/04/2008
• Published: 07/02/2009
• Est. Priority Date: 12/26/2007
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Yamauchi, Himio, Matsubara, Shogo, Tokutomi, Hideaki
• Granted Patent: US 7,688,386 B2
• Time in Patent Office: Days
• US Class Current: 348/448
• 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

According to one embodiment, a de-interlacing apparatus includes: a motion vector detecting section; a full-screen shift detecting section detecting a full-screen shift; a moving-or-still judging section performing a moving/still judgment for a video signal; a moving judgment correcting section correcting a moving/still judgment result to lean toward a moving judgment when full-screen shift is detected; a first interpolation signal generating section generating a first interpolation signal for interpolating a one-field delay signal based on the motion vector and the full-screen shift; a second interpolation signal generating section generating a second interpolation signal for interpolating the one-field delay signal from a current field signal or a two-field delay signal; and an interpolation signal mixing section mixing the first and second interpolation signals to generate a mixed interpolation signal.

Claims

1. A de-interlacing apparatus comprising:

a motion vector detecting section that detects a motion vector using a current field signal of an input video signal, a one-field delay signal obtained by delaying the current field signal by one field, and a two-field delay signal obtained by delaying the one-field delay signal by one field;

a full-screen shift detecting section that detects a full-screen shift indicating a shift of a whole screen in a predetermined direction from the motion vector detected by the motion vector detecting section;

a moving-or-still judging section that performs a moving-or-still judgment according to an amount of motion of the input video signal based on a difference value between the current field signal and the two-field delay signal;

a moving judgment correcting section that corrects, when a full-screen shift is detected by the full-screen shift detecting section, a judgment result obtained by the moving-or-still judging section to lean toward a moving judgment;

a first interpolation signal generating section that performs motion compensation for the one-field delay signal using detection results obtained by the motion vector detecting section and the full-screen shift detecting section, and generates a first interpolation signal for interpolating the one-field delay signal;

a second interpolation signal generating section that generates a second interpolation signal for interpolating the one-field delay signal from any one of the current field signal and the two-field delay signal; and

an interpolation signal mixing section that mixes the first interpolation signal and the second interpolation signal depending on the judgment result obtained by the moving-or-still judging section and corrected by the moving judgment correcting section to generate a mixed interpolation signal.

2. The de-interlacing apparatus according to claim 1, further comprising:

a third interpolation signal generating section that generates a third interpolation signal for interpolating the one-field delay signal by intrafield interpolation; and

a moving image interpolation signal mixing section that mixes the first interpolation signal and the third interpolation signal to generate a moving image interpolation signal, wherein

the interpolation signal mixing section mixes the second interpolation signal and the moving image interpolation signal instead of the first interpolation signal.

3. The de-interlacing apparatus according to claim 2, further comprising:

a reliability judging section that judges reliability of the motion vector; and

a reliability correcting section that corrects, when a full-screen shift is detected by the full-screen shift detecting section, a judgment result obtained by the reliability judging section to increase the reliability, wherein

the moving image interpolation signal mixing section mixes the first interpolation signal and the third interpolation signal depending on the judgment result obtained by the reliability judging section and corrected by the reliability correcting section.

4. The de-interlacing apparatus according to claim 1, further comprising:

a deinterlaced signal outputting section that outputs a deinterlaced signal using the mixed interpolation signal and any one of the current field signal and the two-field delay signal; and

a display control section that displays a video image on a display section using the deinterlaced signal.

5. A de-interlacing method comprising:

detecting a motion vector using a current field signal of an input video signal, a one-field delay signal obtained by delaying the current field signal by one field, and a two-field delay signal obtained by delaying the one-field delay signal by one field;

detecting a full-screen shift indicating a shift of a whole screen in a predetermined direction from the motion vector detected;

performing a moving-or-still judgment according to an amount of motion of the input video signal based on a difference value between the current field signal and the two-field delay signal;

correcting, when a full-screen shift is detected, a judgment result obtained by the moving-or-still judgment to lean toward a moving judgment;

performing motion compensation for the one-field delay signal using detection results obtained by the detecting a motion vector and the detecting a full-screen shift, and generating a first interpolation signal for interpolating the one-field delay signal;

generating a second interpolation signal for interpolating the one-field delay signal from any one of the current field signal and the two-field delay signal; and

generating a mixed interpolation signal by mixing the first interpolation signal and the second interpolation signal depending on the judgment result obtained by the moving-or-still judgment and corrected by the correcting.

6. A video display apparatus comprising:

a de-interlacing section that outputs a deinterlaced signal; and

a video display section that displays a video image using the deinterlaced signal output from the de-interlacing section, wherein

the de-interlacing section includes

a motion vector detecting section that detects a motion vector using a current field signal of an input video signal, a one-field delay signal obtained by delaying the current field signal by one field, and a two-field delay signal obtained by delaying the one-field delay signal by one field;

a full-screen shift detecting section that detects a full-screen shift indicating a shift of a whole screen in a predetermined direction from the motion vector detected by the motion vector detecting section;

a moving-or-still judging section that performs a moving-or-still judgment according to an amount of motion of the input video signal based on a difference value between the current field signal and the two-field delay signal;

a moving judgment correcting section that corrects, when a full-screen shift is detected by the full-screen shift detecting section, a judgment result obtained by the moving-or-still judging section to lean toward a moving judgment;

a first interpolation signal generating section that performs motion compensation for the one-field delay signal using detection results obtained by the motion vector detecting section and the full-screen shift detecting section, and generates a first interpolation signal for interpolating the one-field delay signal;

a second interpolation signal generating section that generates a second interpolation signal for interpolating the one-field delay signal from any one of the current field signal and the two-field delay signal; and

an interpolation signal mixing section that mixes the first interpolation signal and the second interpolation signal depending on the judgment result obtained by the moving-or-still judging section and corrected by the moving judgment correcting section to generate a mixed interpolation signal.

7. The video display apparatus according to claim 6, wherein the de-interlacing section further includes

a third interpolation signal generating section that generates a third interpolation signal for interpolating the one-field delay signal by intrafield interpolation;

and

a moving image interpolation signal mixing section that mixes the first interpolation signal and the third interpolation signal to generate a moving image interpolation signal, and

the interpolation signal mixing section mixes the second interpolation signal and the moving image interpolation signal instead of the first interpolation signal.

8. The video display apparatus according to claim 7, wherein the de-interlacing section further includes

a reliability judging section that judges reliability of the motion vector;

and

a reliability correcting section that corrects, when a full-screen shift is detected by the full-screen shift detecting section, a judgment result obtained by the reliability judging section to increase the reliability, and

the moving image interpolation signal mixing section mixes the first interpolation signal and the third interpolation signal depending on the judgment result obtained by the reliability judging section and corrected by the reliability correcting section.

9. The video display apparatus according to claim 6, further comprising:

a deinterlaced signal outputting section that outputs a deinterlaced signal using the mixed interpolation signal and the one-field delay signal; and

a display control section that displays a video image on the video display section using the deinterlaced signal.