CN102821227B - A kind of decision method of video signal parity field - Google Patents
A kind of decision method of video signal parity field Download PDFInfo
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- CN102821227B CN102821227B CN201110155325.3A CN201110155325A CN102821227B CN 102821227 B CN102821227 B CN 102821227B CN 201110155325 A CN201110155325 A CN 201110155325A CN 102821227 B CN102821227 B CN 102821227B
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Abstract
The invention discloses a kind of decision method of video signal parity field, including：In a video signal, according to row is synchronous, field sync signal determine that row is synchronous, field sync signal effective edge；The field synchronization for measuring a certain field is effective along relative to row, synchronously effectively edge distance is the first displacement；The field synchronization for measuring this upper one is effective along relative to row, synchronously effectively edge distance is second displacement；First displacement is deducted the difference of second displacement and row distance is compared, more than a threshold X, the difference judges that this is even field, the span of the threshold X is 0 ＜ X ＜, 1/2 row distances；Less than threshold X, the difference judges that this is odd field.The decision method of the present invention can be applied to the video signal and off-gauge video signal of standard, improve accuracy and the suitability of the decision method of video signal parity field.
Description
Technical field
The present invention relates to television video signal field.
Background technology
In the initial stage of TV tech development, in order to improve TV refreshing frequency, while do not increase bandwidth, the electricity of early stage
Depending on employing a kind of interleaved technology, will the scan line of TV be divided into odd-numbered line and even number line, only scan in odd field
Odd-numbered line, only scans even number line at even field.
With the development of technology, generate the signal scanning pattern of progressive scan and develop new interlaced scan mode.
When the sequence of the field of input always is odd field, then the scan pattern of current video signal is progressive scan.Field when input
Sequence be parity field replace, then the scan pattern of current video signal is interlacing scan.
With video signal digitization, in order to compatible with former TV tech, while also because interlacing scan is really excellent
Change the utilization rate of bandwidth, digital video signal remains interleaved scan mode, and according to row synchronization and field synchronization
Between position relationship, define the parity field of standard.Due to multimedia market, company is numerous, and technical strength varies, very
The video signal of many companies and be unsatisfactory for standard parity field definition, in other words according to the definition of the parity field of standard, frequent nothing
It is odd field or even field on earth that method determines current field, causes the scan pattern that cannot judge video signal.
As shown in figure 1, working as, row is synchronous (HS), when field synchronization (VS) is high effective (low effective situation is in the same manner), field is same
Being expert between synchronous high period occurs in the rising edge of step, and current field is odd field.
As shown in Fig. 2 outside synchronous high level occurs being expert in the rising edge of field synchronization, current field is even field.
As shown in figure 3, half row distance of deviation between the field synchronization of the field synchronization of odd field and even field, A fields are odd fields, A+1 fields
It is even field.
As shown in figure 4, being expert between synchronous high period occurs in the rising edge of the field synchronization of odd field, B fields are odd fields, B+1
Field is odd field.
The spacing on the effective edge between two row synchronizations is the distance of a video line.
As shown in figure 5, field synchronization delays a period of time for some reason so that the field synchronization letter of odd field and even field
Number all fall to being expert at outside the synchronous valid period, current demand signal criteria of right and wrong video signal, if defined with the parity field of standard,
The sequence of analysis appearance that can be wrong is always to be even field, causes to be inferred to interlacing scan or progressive scan.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of decision method of video signal parity field, can be applied to mark
Accurate video signal and off-gauge video signal, improve accuracy and the suitability of the decision method of video signal parity field
For solving above-mentioned technical problem, the decision method of the present invention is comprised the following steps：
(1) in a video signal, according to row is synchronous, field sync signal determine that row is synchronous, field sync signal effective edge；
When row is synchronous, field sync signal be high effectively when, effectively along being rising edge；
When row is synchronous, field sync signal is low effective, effectively edge is trailing edge；
(2) field synchronization for measuring a certain field is effective along relative to row, synchronously effectively edge distance is the first displacement；
The field synchronization for measuring this upper one is effective along relative to row, synchronously effectively edge distance is second displacement；
(3) the first displacement is deducted the difference of second displacement and row distance is compared, the difference is more than or equal to a threshold
Value X, judges that this is even field, and the span of the threshold X is 0 ＜ X ＜, 1/2 row distances；
Less than threshold X, the difference judges that this is odd field.
The threshold X is 1/4 row distance.
For off-gauge signal, need to judge the type of field by field synchronization relative to the synchronous displacement of row.
As shown in figure 3, the field synchronization of standard idol field is larger relative to the synchronous displacement of row, the displacement is half row distance.
As shown in figure 4, the field synchronization of standard odd field is relative to the synchronous displacement very little of row, the displacement is 0.
0 and half row distance gap, using judging parity field.When field synchronization relative to the synchronous displacement of row more than etc.
One threshold X, judges that this is even field, and the span of the threshold X scope is 0 ＜ X ＜, 1/2 row distances；When field synchronization relative to
Less than threshold X, the synchronous displacement of row judges that this is odd field.
The present invention provides the decision method of video signal parity field, can be suitably used for the video signal of standard and off-gauge regards
Frequency signal, improves accuracy and the suitability of the decision method of video signal parity field
Description of the drawings
The present invention is further detailed explanation with specific embodiment below in conjunction with the accompanying drawings：
Fig. 1 is standard odd field schematic diagram.
Fig. 2 is standard idol field schematic diagram.
Fig. 3 is standard parity field schematic diagram.
Fig. 4 is the continuous odd field schematic diagram of standard.
Fig. 5 is nonstandard video signal schematic diagram after Fig. 3 exception deferrals.
Fig. 6 is the schematic diagram of one embodiment of the invention.
Reference
It is field synchronization that HS is row synchronization VS
A be A fields A+1 be A fields next field
B be B fields B+1 be B fields next field
M be M fields M+1 be M fields next field
It is the first displacement that t1 is second displacement t2.
Specific embodiment
As shown in fig. 6, in a video signal, the field synchronization rising edge for measuring M+1 fields is synchronous relative to row
Rising edge distance is the first displacement t2；The field synchronization rising edge of this upper M field is measured relative to row synchronization rising edge
Distance is second displacement t1.
Measured first displacement t2 is deducted the difference of second displacement t1 and 1/4 row distance of threshold value is compared, the difference
More than or equal to 1/4 row distance, value judges that this is even field.The rising edge of M fields field synchronization occur being expert at synchronous high level it
Outward, this is even field, judges accurately.
The present invention has been described in detail above by specific embodiment and embodiment, but these not constitute right
The restriction of the present invention.Without departing from the principles of the present invention, those skilled in the art can also make many deformations and change
Enter, these also should be regarded as protection scope of the present invention.
Claims (2)
1. a kind of decision method of video signal parity field, it is characterised in that comprise the following steps：
（1）In a video signal, according to row is synchronous, field sync signal determine that row is synchronous, field sync signal effective edge；
（2）The field synchronization for measuring a certain field is effective along relative to row, synchronously effectively edge distance is the first displacement；
Measure this upper one field synchronization effectively synchronous along the row relative to a certain field be second effectively along distance
Move；
（3）First displacement is deducted the difference of second displacement and row distance is compared, the difference is judged more than a threshold X
This is even field, and the span of the threshold X is 0<X<1/2 row distance；
Less than threshold X, the difference judges that this is odd field.
2. decision method as claimed in claim 1, is characterized in that：The threshold X is 1/4 row distance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110155325.3A CN102821227B (en) | 2011-06-10 | 2011-06-10 | A kind of decision method of video signal parity field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110155325.3A CN102821227B (en) | 2011-06-10 | 2011-06-10 | A kind of decision method of video signal parity field |
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| CN102821227A CN102821227A (en) | 2012-12-12 |
| CN102821227B true CN102821227B (en) | 2017-03-15 |
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| CN201110155325.3A Expired - Fee Related CN102821227B (en) | 2011-06-10 | 2011-06-10 | A kind of decision method of video signal parity field |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4057835A (en) * | 1975-09-27 | 1977-11-08 | Kokusai Denshin Denwa Kabushiki Kaisha | System for converting number of lines of television signal |
| US5473382A (en) * | 1992-11-04 | 1995-12-05 | Hitachi, Ltd. | Video signal converting apparatus for converting an interlace video signal into a non-interlace video signal for reduction |
| CN1332574A (en) * | 2000-05-09 | 2002-01-23 | 索尼公司 | Signal processing apparatus and method |
| US6727957B1 (en) * | 1998-09-14 | 2004-04-27 | Sony Corporation | External synchronizing system and camera system using thereof |
| CN1593066A (en) * | 2001-07-10 | 2005-03-09 | 索尼株式会社 | Video signal judgment apparatus and method |
| CN1842167A (en) * | 2005-03-28 | 2006-10-04 | 日本电气株式会社 | Color frame detection circuit and image signal conversion device |
| CN1913616A (en) * | 2005-08-10 | 2007-02-14 | 三星电子株式会社 | Method and apparatus for processing video signal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3580792B2 (en) * | 2001-12-12 | 2004-10-27 | 沖電気工業株式会社 | Video signal detection circuit |
-
2011
- 2011-06-10 CN CN201110155325.3A patent/CN102821227B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4057835A (en) * | 1975-09-27 | 1977-11-08 | Kokusai Denshin Denwa Kabushiki Kaisha | System for converting number of lines of television signal |
| US5473382A (en) * | 1992-11-04 | 1995-12-05 | Hitachi, Ltd. | Video signal converting apparatus for converting an interlace video signal into a non-interlace video signal for reduction |
| US6727957B1 (en) * | 1998-09-14 | 2004-04-27 | Sony Corporation | External synchronizing system and camera system using thereof |
| CN1332574A (en) * | 2000-05-09 | 2002-01-23 | 索尼公司 | Signal processing apparatus and method |
| CN1593066A (en) * | 2001-07-10 | 2005-03-09 | 索尼株式会社 | Video signal judgment apparatus and method |
| CN1842167A (en) * | 2005-03-28 | 2006-10-04 | 日本电气株式会社 | Color frame detection circuit and image signal conversion device |
| CN1913616A (en) * | 2005-08-10 | 2007-02-14 | 三星电子株式会社 | Method and apparatus for processing video signal |
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| CN102821227A (en) | 2012-12-12 |
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Granted publication date: 20170315 Termination date: 20180610 |