Patent US5886745A successfully refreshed from Google Patents.
US5886745A
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US
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Progressive scanning conversion apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1995-12-07
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Granted: 1999-03-23
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Expires: 2015-12-07
Abstract
Abstract A progressive scanning conversion apparatus for converting an interlaced scan video signal into a progressive scan video signal by performing interpolation based on original pixels which are obtained in a matrix by sampling the interlaced scan video signal in a current field, original pixels which are obtained in a matrix by sampling the interlaced scan video signal in a previous field which is immediately prior to the current field, and original pixels which are obtained in a matrix by sampling the interlaced scan video signal in a next field which is immediately following the current field. The apparatus includes a motion vector detector for detecting a motion vector between two of the current field, the previous field, and the next field; a motion estimation circuit for estimating a pixel value in the current field, from one of a pixel in the previous field and a pixel in the next field using the motion vector detected by the vector detection means; and an interpolated pixel generator for generating an interpolated pixel used for conversion by multiplying the pixel value obtained by the motion estimation means and the corresponding pixel value in the current field by a weighting factor and summating the multiplication results.
Inventors
- 👤 Tsutomu Muraji
- 👤 Keiichi Kuzumoto
- 👤 Satoshi Hirotsune
- 👤 Mitsuru Kotaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:15
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/40; H04N19/50; H04N19/503; H04N19/51; H04N19/587; H04N5/00; H04N5/14; H04N5/144; H04N5/145; H04N7/00; H04N7/01; H04N7/0117; H04N7/012
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
208 words
A progressive scanning conversion apparatus for converting an interlaced scan signal into a progressive scan signal by performing interpolation based on original pixels which are obtained in a matrix by sampling the interlaced scan video signal in one field, the apparatus comprising: slope direction detection means for detecting a slope direction of a pair of original pixels, the pixel values of which have a minimum correlative value among a plurality of pairs of original pixels which are symmetrical with respect to an interpolated pixel to be generated for conversion; slope direction storage means for storing the slope direction detected by the slope direction detection means; and filter means for generating the interpolated pixel; wherein: the slope direction detection means detects the slope direction from among a plurality of slope directions in a prescribed range, the center of the prescribed range being a prescribed slope direction stored in the slope direction storage means, the slope direction storage means sequentially stores slope direction detected by the slope direction detection means while outputting the prescribed slope direction among the stored slope directions, and the filter means generates the interpolated pixel for conversion based on a prescribed number of original pixels in the slope direction detected by the slope direction detection means.
Claim 2
Dependent Claim
208 words
A progressive scanning conversion apparatus for converting an interlaced scan signal into a progressive scan signal by performing interpolation based on original pixels which are obtained in a matrix by sampling the interlaced scan video signal in one field, the apparatus comprising: slope direction detection means for detecting a slope direction of a pair of original pixels, the pixel values of which have a minimum correlative value among a plurality of pairs of original pixels which are symmetrical with respect to an interpolated pixel to be generated for conversion; slope direction storage means for storing the slope direction detected by the slope direction detection means; and filter means for generating the interpolated pixel; wherein: the slope direction detection means detects the slope direction from among a plurality of slope directions in a prescribed range, the center of the prescribed range being a prescribed slope direction stored in the slope direction storage means, the slope direction storage means sequentially stores slope direction detected by the slope direction detection means while outputting the prescribed slope direction among the stored slope directions, and the filter means generates the interpolated pixel for conversion based on a prescribed number of original pixels in the slope direction detected by the slope direction detection means.
Claim 3
Dependent Claim
80 words
A progressive scanning conversion apparatus according to claim 1, wherein the prescribed range includes a first original pixel which is located right with respect to and on the same scan line as one of the pair of original pixels in the prescribed slope direction stored in the slope direction storage means and includes a second original pixel which is located left with respect to and on the same scan line as the other one of the pair of original pixels.
Claim 4
Dependent Claim
57 words
A progressive scanning conversion apparatus according to claim 1, wherein the slope direction detection means evaluates the correlation of the plurality of pairs of original pixels symmetrical with respect to the interpolated pixel based on correlative values thereof, and determines the pair of original pixels having a minimum correlative value to have a highest level of correlation.
Claim 5
Dependent Claim
47 words
A progressive scanning conversion apparatus according to claim 1, wherein the slope direction detection means generates the interpolated pixel based on the prescribed slope direction stored in the slope direction storage means in the case one pair of pixels having a minimum correlative value cannot be specified.
Claim 6
Dependent Claim
39 words
A progressive scanning conversion apparatus according to claim 1, wherein the filter means outputs an average value of the values of the pair of original pixels having a minimum correlative value as the pixel value of the interpolated pixel.
Claim 7
Dependent Claim
35 words
A progressive scanning conversion apparatus according to claim 1, wherein the filter means generates the interpolated pixel based on the original pixels on a plurality of lines vertically interposing the interpolated pixel to be generated.
Claim 8
Dependent Claim
192 words
A progressive scanning conversion apparatus for converting an interlaced scan signal into a progressive scan signal by performing interpolation based on original pixels which are obtained in a matrix by sampling the interlaced scan video signal in one field, the apparatus comprising: original pixel selection means for selecting a plurality of pairs of original pixels which are symmetrical with respect to an interpolated pixel to be generated for conversion; correlative value calculation means for calculating correlative values of the values of the pairs of original pixels selected by the original pixel selection means; edge information detection means for detecting edge information of each of the original pixels; correlative value correction means for correcting the correlative values calculated by the correlative value calculation means, using the edge information detected by the edge information detection means; slope direction detection means for detecting a slope direction of the pair of original pixels having a minimum correlative value among the correlative values obtained by the correlative value correction means; and filter means for generating the interpolated pixel based on a prescribed number of original pixels in the slope direction detected by the slope direction detection means.
Claim 9
Dependent Claim
192 words
A progressive scanning conversion apparatus for converting an interlaced scan signal into a progressive scan signal by performing interpolation based on original pixels which are obtained in a matrix by sampling the interlaced scan video signal in one field, the apparatus comprising: original pixel selection means for selecting a plurality of pairs of original pixels which are symmetrical with respect to an interpolated pixel to be generated for conversion; correlative value calculation means for calculating correlative values of the values of the pairs of original pixels selected by the original pixel selection means; edge information detection means for detecting edge information of each of the original pixels; correlative value correction means for correcting the correlative values calculated by the correlative value calculation means, using the edge information detected by the edge information detection means; slope direction detection means for detecting a slope direction of the pair of original pixels having a minimum correlative value among the correlative values obtained by the correlative value correction means; and filter means for generating the interpolated pixel based on a prescribed number of original pixels in the slope direction detected by the slope direction detection means.
Claim 10
Dependent Claim
20 words
A progressive scanning conversion apparatus according to claim 7, wherein the correlative value correction means includes a look-up table memory.
Claim 11
Dependent Claim
51 words
A progressive scanning conversion apparatus according to claim 7, wherein the slope direction detection means evaluates the correlation of the plurality of pairs of original pixels based on differential absolute values thereof, and determines the pair of original pixels having a minimum correlative value to have a highest level of correlation.
Claim 12
Dependent Claim
36 words
A progressive scanning conversion apparatus according to claim 7, wherein the filter means outputs an average value of the pair of original pixels having a minimum correlative value as the pixel value of the interpolated pixel.
Claim 13
Dependent Claim
37 words
A progressive scanning conversion apparatus according to claim 7, wherein the filter means generates the interpolated pixel based on the original pixels on a plurality of lines vertically interposing the interpolated pixel to be generated for conversion.
Claim 14
Dependent Claim
240 words
A progressive scanning conversion apparatus for converting an interlaced scan signal into a progressive scan signal by performing interpolation based on original pixels which are obtained in a matrix by sampling the interlaced scan video signal in one field, the apparatus comprising: original pixel selection means for selecting a plurality of pairs of original pixels which are symmetrical with respect to an interpolated pixel to be generated for conversion; correlative value calculation means for calculating correlative values of the values of the pairs of original pixels selected by the original pixel selection means; vertical direction edge information detection means for detecting edge information in the vertical direction of each of the original pixels; first correlative value correction means for correcting the correlative values calculated by the correlative value calculation means, using the edge information in the vertical direction detected by the vertical direction edge information detection means; second correlative value correction means for correcting the correlative values obtained by the first correlative value correction means using the edge information in the vertical direction of each of the original pixels; slope direction detection means for detecting a slope direction of the pair of original pixels having a minimum correlative value among the correlative values obtained by the first and second correlative value correction means; and filter means for generating the interpolated pixel based on a prescribed number of original pixels in the slope direction detected by the slope direction detection means.
Claim 15
Dependent Claim
240 words
A progressive scanning conversion apparatus for converting an interlaced scan signal into a progressive scan signal by performing interpolation based on original pixels which are obtained in a matrix by sampling the interlaced scan video signal in one field, the apparatus comprising: original pixel selection means for selecting a plurality of pairs of original pixels which are symmetrical with respect to an interpolated pixel to be generated for conversion; correlative value calculation means for calculating correlative values of the values of the pairs of original pixels selected by the original pixel selection means; vertical direction edge information detection means for detecting edge information in the vertical direction of each of the original pixels; first correlative value correction means for correcting the correlative values calculated by the correlative value calculation means, using the edge information in the vertical direction detected by the vertical direction edge information detection means; second correlative value correction means for correcting the correlative values obtained by the first correlative value correction means using the edge information in the vertical direction of each of the original pixels; slope direction detection means for detecting a slope direction of the pair of original pixels having a minimum correlative value among the correlative values obtained by the first and second correlative value correction means; and filter means for generating the interpolated pixel based on a prescribed number of original pixels in the slope direction detected by the slope direction detection means.
Claim 16
Dependent Claim
21 words
A progressive scanning conversion apparatus according to claim 12, wherein the first correlative value correction means includes a look-up table memory.
Claim 17
Dependent Claim
21 words
A progressive scanning conversion apparatus according to claim 12, wherein the second correlative value correction means includes a look-up table memory.
Claim 18
Dependent Claim
51 words
A progressive scanning conversion apparatus according to claim 12, wherein the slope direction detection means evaluates the correlation of the plurality of pairs of original pixels based on differential absolute values thereof, and determines the pair of original pixels having a minimum correlative value to have a highest level of correlation.
Claim 19
Dependent Claim
41 words
A progressive scanning conversion apparatus according to claim 12, wherein the filter means outputs an average value of the values of the pair of original pixels having a minimum correlative value as the pixel value of the interpolated pixel for conversion.
Claim 20
Dependent Claim
35 words
A progressive scanning conversion apparatus according to claim 12, wherein the filter means generates the interpolated pixel based on the original pixels on a plurality of lines vertically interposing the interpolated pixel to be generated.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-03-22 | 2002-09-21 | 2003-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-22 | 2006-09-21 | 2007-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-22 | 2010-09-21 | 2011-03-23 | $7700.00 | Window Closed / Lapsed |