CN107888863B - Frame extraction method for converting ultrahigh frame frequency image stream into standard analog video stream - Google Patents
Frame extraction method for converting ultrahigh frame frequency image stream into standard analog video stream Download PDFInfo
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- CN107888863B CN107888863B CN201711221456.0A CN201711221456A CN107888863B CN 107888863 B CN107888863 B CN 107888863B CN 201711221456 A CN201711221456 A CN 201711221456A CN 107888863 B CN107888863 B CN 107888863B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0102—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving the resampling of the incoming video signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
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Abstract
The invention relates to a frame extraction method for converting an ultrahigh frame frequency image stream into a standard analog video stream, which synchronizes a trigger signal of the standard analog video stream by using the trigger signal of the ultrahigh frame frequency image stream, adaptively adjusts the phase relation between the trigger signal of the ultrahigh frame frequency image stream and the trigger signal of the standard analog video stream, extracts a frame of image signal from the ultrahigh frame frequency image stream according to an analog video period, can effectively avoid the time sequence conflict between the ultrahigh frame frequency image processing time sequence and the standard analog video display time sequence, and further realizes the conversion from the ultrahigh frame frequency image stream to the standard analog video stream. The method is realized in an engineering way, can realize the conversion from the ultrahigh frame frequency image stream to the standard analog video stream under the condition of not influencing the processing time sequence of the ultrahigh frame frequency image stream and not increasing the consumption of hardware storage resources, is convenient for visual observation and has good engineering practicability.
Description
Technical Field
The invention belongs to the technical field of image processing, and relates to a frame extraction method for converting an ultrahigh frame frequency image stream into a standard analog video stream.
Background
In an infrared imaging guidance system, as the distance between the missile and the target approaches, the target gradually increases to form an unstable spot shape and finally fills the whole field of view at a fast speed, and the process can only occur within a plurality of seconds in the supersonic wave period. In the standard analog video, for example, in the PAL format, only 40 frames of image data can be acquired in each second, which is obviously too slow for a high-speed guidance system, so that the infrared detector is required to be capable of operating in a high-speed external trigger mode, and the output frame frequency can reach several hundred kilohertz or even more. Analog video display is still required in such a case to facilitate visual observation. The method adopted in the past is to directly extract one frame of image from the ultrahigh frame frequency image stream according to the analog video period to realize analog display, but the method has the following defects: firstly, the method of direct frame extraction display requires that the period of the trigger signal of the image stream with ultra-high frame frequency must be integral multiple of the period of the analog video; secondly, a determined phase relation does not exist between the analog video signal and a trigger signal of the ultrahigh frame frequency image stream, and time sequence conflict is easy to occur; thirdly, when the frequency of the ultrahigh frame rate image stream is too high, the process of directly extracting one frame of data from a plurality of frames to realize analog display is very complicated. In order to overcome the defects, a frame extraction algorithm for converting an ultrahigh frame frequency image stream into a standard analog video stream is provided.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a frame extraction method for converting an ultrahigh frame frequency image stream into a standard analog video stream, which overcomes the defect of realizing the conversion from the ultrahigh frame frequency image stream into the standard analog video stream by adopting a direct frame extraction method and improves the simplicity and stability of the conversion from the ultrahigh frame frequency image stream into the standard analog video stream.
Technical scheme
A frame extraction method for converting an ultrahigh frame frequency image stream into a standard analog video stream is characterized by comprising the following steps:
step 1: inputting a trigger signal of the ultrahigh frame frequency image stream by an external upper computer;
step 2: acquiring a trigger signal to finish the jitter elimination of the edge; pulse width deburring is realized according to the pulse width of the trigger signal;
and step 3: clearing a phase synchronization counter by using a trigger signal of the ultrahigh frame frequency image stream, starting counting by using the phase synchronization counter, triggering an infrared detector to output an effective signal according to a frame by using the counter as a reference, and triggering the start of the analog video stream by using the counter as the reference to realize that the standard analog video stream and the ultrahigh frame frequency image stream have a determined phase relationship and realize phase synchronization;
and 4, step 4: triggering the reading of image frame stored data by using a read enabling signal of a standard analog video stream;
and 5: after reading the frame memory data, setting a frame memory read-out complete mark and closing the frame memory write-out complete mark, simultaneously starting to monitor a frame effective starting signal of the ultrahigh frame frequency image stream, and after monitoring the frame effective starting signal, taking the phase of the frame effective signal and the data read-out complete mark as an enabling signal for writing the frame memory, and further writing effective data output by the infrared detector into the frame memory;
step 6: after the writing of the frame is finished, setting a frame writing-finishing mark and closing the frame writing-finishing mark to stop writing new image data, so that the complete image data of one frame can be ensured to be written in the frame memory, the image data required when the next frame memory reading period comes is met, and the conversion from the ultrahigh frame frequency image stream to the standard analog video stream is realized.
Advantageous effects
The invention provides a frame extraction method for converting an ultrahigh frame frequency image stream into a standard analog video stream, which is characterized in that a trigger signal of the ultrahigh frame frequency image stream is used for synchronizing a trigger signal of the standard analog video stream, the phase relation between the trigger signal of the ultrahigh frame frequency image stream and the trigger signal of the standard analog video stream is adaptively adjusted, and a frame of image signal is extracted from the ultrahigh frame frequency image stream according to an analog video period, so that the conflict between the ultrahigh frame frequency image processing time sequence and the time sequence of standard analog video display can be effectively avoided, and the conversion from the ultrahigh frame frequency image stream to the standard analog video stream is further realized. The method is realized in an engineering way, can realize the conversion from the ultrahigh frame frequency image stream to the standard analog video stream under the condition of not influencing the processing time sequence of the ultrahigh frame frequency image stream and not increasing the consumption of hardware storage resources, is convenient for visual observation and has good engineering practicability.
Drawings
FIG. 1 is a flow chart of a specific implementation procedure of the present invention.
Fig. 2 is a timing diagram according to the present invention.
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
1) inputting a trigger signal of the ultrahigh frame frequency image stream by an external upper computer;
2) acquiring a trigger signal to finish the jitter elimination of the edge; pulse width deburring is realized according to the pulse width of the trigger signal so as to avoid false trigger output of image flow caused by signal integrity problems such as jitter and burr of the trigger signal;
3) in order to ensure the synchronous display of the standard analog video stream and the ultrahigh frame frequency image stream, the standard analog video stream and the ultrahigh frame frequency image stream need to have a determined phase relationship, and the phase synchronization of the two video streams is completed according to the step 4;
4) the method comprises the steps that a phase synchronization counter is cleared by a trigger signal of the ultrahigh frame frequency image stream, then the phase synchronization counter starts counting, an infrared detector is triggered to output an effective signal according to a frame by taking the counter as a reference, and the start of the analog video stream is triggered by taking the counter as the reference, so that the standard analog video stream and the ultrahigh frame frequency image stream can be ensured to have a determined phase relation, and further phase synchronization is realized;
5) triggering reading of image frame stored data with read enable signal of standard analog video stream
6) After reading the frame memory data, setting a frame memory read-out complete mark and closing the frame memory write-out complete mark, simultaneously starting to monitor a frame effective starting signal of the ultrahigh frame frequency image stream, and after monitoring the frame effective starting signal, taking the phase of the frame effective signal and the data read-out complete mark as an enabling signal for writing the frame memory, and further writing effective data output by the infrared detector into the frame memory;
7) after the writing of the frame is finished, setting a frame writing-finishing mark and closing the frame writing-finishing mark to stop writing new image data, so that the complete image data of one frame can be ensured to be written in the frame memory, the image data required when the next frame memory reading period comes is met, and the conversion from the ultrahigh frame frequency image stream to the standard analog video stream is realized.
Claims (1)
1. A frame extraction method for converting an ultrahigh frame frequency image stream into a standard analog video stream is characterized by comprising the following steps:
step 1: inputting a trigger signal of the ultrahigh frame frequency image stream by an external upper computer;
step 2: acquiring a trigger signal to finish the jitter elimination of the edge; pulse width deburring is realized according to the pulse width of the trigger signal;
and step 3: clearing a phase synchronization counter by using a trigger signal of the ultrahigh frame frequency image stream, starting counting by using the phase synchronization counter, triggering an infrared detector to output an effective signal according to a frame by using the counter as a reference, and triggering the start of the analog video stream by using the counter as the reference to realize that the standard analog video stream and the ultrahigh frame frequency image stream have a determined phase relationship and realize phase synchronization;
and 4, step 4: triggering the reading of image frame stored data by using a read enabling signal of a standard analog video stream;
and 5: after reading the frame memory data, setting a frame memory read-out complete mark and closing the frame memory write-out complete mark, simultaneously starting to monitor a frame effective starting signal of the ultrahigh frame frequency image stream, and after monitoring the frame effective starting signal, taking the phase of the frame effective signal and the data read-out complete mark as an enabling signal for writing the frame memory, and further writing effective data output by the infrared detector into the frame memory;
step 6: after the writing of the frame is finished, setting a frame writing-finishing mark and closing the frame writing-finishing mark to stop writing new image data, so that the complete image data of one frame can be ensured to be written in the frame memory, the image data required when the next frame memory reading period comes is met, and the conversion from the ultrahigh frame frequency image stream to the standard analog video stream is realized.
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| CN201711221456.0A CN107888863B (en) | 2017-11-29 | 2017-11-29 | Frame extraction method for converting ultrahigh frame frequency image stream into standard analog video stream |
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| CN107888863B true CN107888863B (en) | 2020-02-14 |
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| CN1538736A (en) * | 2003-04-18 | 2004-10-20 | 成都威斯达芯片有限责任公司 | Method of conversing image framel field frequency in video signal processing |
| CN1627359A (en) * | 2003-09-25 | 2005-06-15 | 佳能株式会社 | Frame rate conversion device, overtaking prediction method for use in the same, display control device and video receiving display device |
| CN1719888A (en) * | 2005-08-08 | 2006-01-11 | 北京中星微电子有限公司 | Apparatus for implementing video frequency sequential to interlaced conversion and converting method |
| CN201892936U (en) * | 2010-12-06 | 2011-07-06 | 中国航空工业集团公司第六三一研究所 | Video conversion device |
| CN103518369A (en) * | 2011-04-01 | 2014-01-15 | 松下电器产业株式会社 | Video signal frame rate conversion device and method, and video processing device using said frame rate conversion |
| CN104639951A (en) * | 2013-11-06 | 2015-05-20 | 杭州海康威视数字技术股份有限公司 | Video bitstream frame extraction process and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI348821B (en) * | 2007-08-08 | 2011-09-11 | Alpha Networks Inc | Interface converting circuit |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1538736A (en) * | 2003-04-18 | 2004-10-20 | 成都威斯达芯片有限责任公司 | Method of conversing image framel field frequency in video signal processing |
| CN1627359A (en) * | 2003-09-25 | 2005-06-15 | 佳能株式会社 | Frame rate conversion device, overtaking prediction method for use in the same, display control device and video receiving display device |
| CN1719888A (en) * | 2005-08-08 | 2006-01-11 | 北京中星微电子有限公司 | Apparatus for implementing video frequency sequential to interlaced conversion and converting method |
| CN201892936U (en) * | 2010-12-06 | 2011-07-06 | 中国航空工业集团公司第六三一研究所 | Video conversion device |
| CN103518369A (en) * | 2011-04-01 | 2014-01-15 | 松下电器产业株式会社 | Video signal frame rate conversion device and method, and video processing device using said frame rate conversion |
| CN104639951A (en) * | 2013-11-06 | 2015-05-20 | 杭州海康威视数字技术股份有限公司 | Video bitstream frame extraction process and device |
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