CN202524491U - Video acquisition card - Google Patents
Video acquisition card Download PDFInfo
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- CN202524491U CN202524491U CN 201120553238 CN201120553238U CN202524491U CN 202524491 U CN202524491 U CN 202524491U CN 201120553238 CN201120553238 CN 201120553238 CN 201120553238 U CN201120553238 U CN 201120553238U CN 202524491 U CN202524491 U CN 202524491U
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Abstract
The present utility model discloses a video acquisition card. The card comprises a video receiving and processing module, an LTC time code receiving module, a time code generating and storing module and a bus control interface. The video receiving and processing module is connected with a camera and the bus control interface and used for receiving video signals output by the camera, and writing the video signals into an internal memory of a computer through the bus control interface; the LTC time code receiving module is connected with the camera and used for receiving LTC time code output by the camera, and outputting the LTC time code to the time code generating and storing module; and the time code generating and storing module is connected with the LTC time code receiving module and the bus control interface, and used for storing the LTC time code as time code of the video signals and writing into the internal memory through the bus control interface. The video acquisition card is directly used for collecting the video signals and the LTC time code output by the camera, and costs can be saved.
Description
Technical field
The utility model relates to technical field of video processing, more specifically, relates to a kind of video frequency collection card.
Background technology
In the process of video productions such as movie and video programs, need take and the vision signal of output gathered video camera, simultaneously also need (Time Code TC) gathers to the timing code of video.Timing code be video camera when the picture signal of recording of video, to unique time encoding of each width of cloth image record, be a kind of digital signal that is applied to flow.This signal is that each frame in the video all distributes a numeral, in order to expression hour, minute, second and frame number.Its form is: xxHxxMxxSxxF, xx wherein represent numeral, and just xx hour xx minute xx xx second frame as long as remember the timing code of a certain width of cloth picture like this, just can find it at an easy rate on tape.
As shown in Figure 1; In order to realize collection to video and timing code thereof; Traditional acquisition method is normally: at first; Use video tape recorder that video camera is taken the video signal recording that obtains and export on tape, and LTC (LTC Longitudinal Time Code) timing code of the vision signal of video camera output is recorded on the track of tape.Then, in post production process, the video material that needs will be stored on the tape uploads in the nonlinear editing system, utilizes the video frequency collection card that is installed in the system in the computer to gather.Among Fig. 1, the video output interface of video tape recorder is connected to the video input interface of video frequency collection card, and the RS-422 Remote Control Interface of video tape recorder is connected to the RS-422 interface of video frequency collection card.When video acquisition is stuck in the vision signal of gathering video tape recorder output, gather the timing code (timing code be included in control information) of video tape recorder through the output of RS-422 Remote Control Interface through the RS-422 interface.
But, in above-mentioned acquisition method, needing the participation of video tape recorder, cost is higher; The video image of video tape recorder playback has passed through compressed encoding and decoding, and picture quality can be lost.
Summary of the invention
In view of this, the main purpose of the utility model is to provide a kind of video frequency collection card, can solve the problem that the cost height that exists in the prior art and picture quality can be lost.
For achieving the above object, the technical scheme of the utility model is achieved in that
The utility model provides a kind of video frequency collection card; Comprise: video reception processing module, LTC timing code receiver module, timing code generation memory module and bus control interface; Wherein: the video reception processing module; Be connected with bus control interface with video camera, be used to receive the vision signal of video camera output, and vision signal is write the internal memory of computer through bus control interface; LTC timing code receiver module is connected with video camera, is used to receive the LTC timing code of video camera output, and the LTC timing code is exported to timing code generation memory module; Timing code generation memory module is connected with bus control interface with LTC timing code receiver module, is used for the LTC timing code is preserved as the timing code of vision signal, so that through the bus control interface write memory.
Wherein, above-mentioned video frequency collection card also comprises: the audio video synchronization separation module; Wherein: the audio video synchronization separation module, be connected with timing code generation memory module, be used for isolating the horizontal-drive signal and the vertical synchronizing signal of reference video signal, and output to timing code generation memory module from the reference video signal of input; Timing code generation memory module specifically is used in the predetermined amount of time after each reference video frame begins; If received the LTC timing code of LTC timing code receiver module input; Then the value of current time code is updated to the LTC timing code of input, so that as the timing code write memory of this frame video in the vision signal, wherein; The time started of each reference video frame is confirmed that by vertical synchronizing signal predetermined amount of time is confirmed by horizontal-drive signal.
Wherein, Timing code generation memory module specifically also is used in the predetermined amount of time after each reference video frame begins; If do not receive the LTC timing code of LTC timing code receiver module input; Then the value with current time code increases by 1 frame, so that as the timing code write memory of this frame video in the vision signal.
Wherein, the video reception processing module comprises: the video reception module, be connected with video camera, be used to receive the vision signal of video camera output, convert vision signal into the parallel digital video signal after, export to screen buffer; Screen buffer is connected with the video reception module, is used for the parallel digital video signal is carried out buffer-stored; Dma controller is connected with bus control interface with screen buffer, is used for the parallel digital video signal of screen buffer is read, and through the bus control interface write memory.
Wherein, above-mentioned video frequency collection card also comprises: LTC timing code input interface and LTC timing code output interface, and wherein: LTC timing code receiver module is connected with video camera through LTC timing code input interface; LTC timing code output interface is connected with LTC timing code input interface, is used for the LTC timing code ring logical output of video camera through the input of LTC timing code input interface.
Wherein, bus control interface is connected on the system for computer bus.
The technique effect of the utility model: video frequency collection card has the LTC timing code receiver module of the LTC timing code that can directly receive video camera output; And can directly receive the video reception processing module of gathering vision signal; Thereby; Can when gathering video image, preserve the video camera LTC timing code of output synchronously for each frame collects video image, make computer acquisition to video file can directly be used to support the later stage program making of timing code.Because video frequency collection card is the vision signal and the LTC timing code of acquisition camera output directly, need not video tape recorder and participate in, practiced thrift cost, and the non-compression video of the direct acquisition camera output of video frequency collection card can not bring influence to picture quality.
Description of drawings
Accompanying drawing described herein is used to provide the further understanding to the utility model, constitutes the application's a part, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:
Fig. 1 shows the structural representation according to the video of prior art and timing code acquisition system thereof;
Fig. 2 shows the structural representation according to the video frequency collection card of the embodiment one of the utility model;
Fig. 3 shows the structural representation according to the video frequency collection card of the embodiment two of the utility model;
Fig. 4 shows a kind of structural representation according to the video frequency collection card of the embodiment three of the utility model;
Fig. 5 shows the another kind of structural representation according to the video frequency collection card of the embodiment three of the utility model;
Fig. 6 shows the flow chart according to the processing method of the video frequency collection card of the embodiment four of the utility model.
Embodiment
Below with reference to accompanying drawing and combine embodiment, specify the utility model.
Embodiment one
Fig. 2 shows the structural representation according to the video frequency collection card of the embodiment one of the utility model, and this video frequency collection card is installed in the computer, is used for the vision signal and the LTC timing code of acquisition camera output.
As shown in Figure 2, this video frequency collection card comprises: video reception processing module 10, LTC timing code receiver module 20, timing code generation memory module 30 and bus control interface 40, wherein:
Video reception processing module 10 is connected with bus control interface 40 with video camera, is used to receive the vision signal of video camera output, and vision signal is write the internal memory of computer through bus control interface 40;
LTC timing code receiver module 20 is connected with video camera, is used to receive the LTC timing code (with the LTC timing code of the synchronous output of vision signal) of video camera output, and the LTC timing code is exported to timing code generation memory module 30;
Timing code generation memory module 30 is connected with bus control interface 40 with LTC timing code receiver module 20, is used for the LTC timing code is preserved as the timing code of vision signal, so that through bus control interface 40 write memories.
Wherein, bus control interface 40 is connected on the system for computer bus, receives data and sends data to system bus from system bus.
The video frequency collection card of prior art since do not have the timing code receiving interface, or the timing code receiving interface that has inequality with the timing code output interface of video camera, the therefore direct LTC timing code exported of acquisition camera; Therefore; Need the participation of video tape recorder, cost is higher, and; The video image of video tape recorder playback has passed through compressed encoding and decoding, and picture quality can be lost.And the video frequency collection card of the utility model embodiment has the LTC timing code receiver module of the LTC timing code that can directly receive video camera output; And can directly receive the video reception processing module of gathering vision signal; Thereby; Can when gathering video image, preserve the video camera LTC timing code of output synchronously for each frame collects video image, make computer acquisition to video file can directly be used to support the later stage program making of timing code.Because video frequency collection card is the vision signal and the LTC timing code of acquisition camera output directly, need not video tape recorder and participate in, practiced thrift cost, and the non-compression video of the direct acquisition camera output of video frequency collection card can not bring influence to picture quality.
Embodiment two
As shown in Figure 3, can also comprise in the video frequency collection card among the embodiment one: audio video synchronization separation module 50; Wherein:
Audio video synchronization separation module 50; Be connected with timing code generation memory module 30; The reference video signal that is used for from input (can be the reference video signal of input such as synchronous generator; The frequency and the zero-time that are used for synchronous video signal) isolate the horizontal-drive signal and the vertical synchronizing signal of reference video signal, and isolated level and vertical synchronizing signal are outputed to timing code generation memory module 30.
Then; In the predetermined amount of time of timing code generation memory module 30 after each reference video frame begins; If received the LTC timing code of LTC timing code receiver module 20 inputs; Then the value of current time code is updated to the LTC timing code of input, so that as the timing code write memory of this frame video in the vision signal; If do not receive the LTC timing code of LTC timing code receiver module 20 input, then the value with current time code increases by 1 frame, so that as the timing code write memory of this frame video in the vision signal; Wherein, the time started of each reference video frame is confirmed that by vertical synchronizing signal predetermined amount of time is confirmed by horizontal-drive signal.
In actual implementation process, LTC timing code receiver module demodulates the LTC timing code from the LTC time code signal of input, export to timing code generation memory module.Can comprise one in the timing code generation memory module is the local zone time code timing device of time of day with the frame of video.After a reference video frame begins; If do not receive the LTC timing code that effectively transmits in the section (this predetermined amount of time is confirmed by horizontal-drive signal) at the fixed time from LTC timing code receiver module; Local zone time code timing device increases the timing time of a frame on original timing code, as the timing code of this frame video.If received the LTC timing code that effectively transmits from LTC timing code receiver module at the fixed time in the section, then local zone time code timing device is updated to the time code value LTC timing code that receives.
This mechanism has guaranteed to be interfered when the LTC time code signal connection interruption or the signal of input video capture card; And cause LTC timing code receiver module to receive when makeing mistakes; Timing code generation memory module still can be with reference video frame as elapsed time clock; Continue to provide the timing code of continuous effective, recover effectively until the LTC timing code of video camera input.
Embodiment three
As shown in Figure 4; Can comprise with lower module in the video reception processing module 10 in the video frequency collection card among the embodiment one and two: video reception module 102, screen buffer 104 and DMA (Direct Memory Access, direct memory access) controller 106.
Wherein:
Video reception module 102; Be connected with video camera, be used to receive the vision signal of video camera output, convert vision signal into the parallel digital video signal after; Export to screen buffer 104, and export corresponding data clock and read-write control signal and give screen buffer 104.
Screen buffer 104 is connected with video reception module 102, is used for the parallel digital video signal is carried out buffer-stored compensation DMA time delay of data transmission.
Dma controller 106 is connected with bus control interface 40 with screen buffer 104, is used for the parallel digital video signal of screen buffer 104 is read, and through bus control interface 40 write memories.
As shown in Figure 5, can also comprise in the video frequency collection card: LTC timing code input interface 60 and LTC timing code output interface 70.The LTC timing code that LTC timing code receiver module 20 receives from video camera through LTC timing code input interface 60.And, can also be through the LTC timing code of LTC timing code input interface 60 inputs through the logical output of LTC timing code output interface 70 rings, the LTC timing code input interface that can be connected to other equipment is to provide LTC timing code.When reality is implemented, before output, after can also through amplifier the LTC timing code being amplified earlier, export away through LTC timing code output interface 70 again.
Embodiment four
The processing method of the video frequency collection card among the embodiment one to three, as shown in Figure 6, may further comprise the steps:
Step S602, the video reception processing module receives the vision signal of video camera output, and vision signal is write the internal memory of computer through bus control interface;
Concrete; The video reception module receives the vision signal of video camera output; Convert vision signal into the parallel digital video signal and (for example, convert serial digital video signal into the parallel digital video signal, perhaps; Convert analog video signal into behind digital video signal parallelization again) after, screen buffer exported to; Screen buffer carries out buffer-stored to the parallel digital video signal; Dma controller is read the parallel digital video signal in the screen buffer, and through the bus control interface write memory.
Step S604, LTC timing code receiver module receives the LTC timing code of video camera output, and the LTC timing code is exported to timing code generation memory module;
Step S606, timing code generation memory module preserves the LTC timing code get off as the timing code of vision signal, so that through the bus control interface write memory.
The video frequency collection card of the utility model embodiment has the LTC timing code receiver module of the LTC timing code that can directly receive video camera output; And can directly receive the video reception processing module of gathering vision signal; Thereby; Can when gathering video image, preserve the video camera LTC timing code of output synchronously for each frame collects video image, make computer acquisition to video file can directly be used to support the later stage program making of timing code.Because video frequency collection card is the vision signal and the LTC timing code of acquisition camera output directly, need not video tape recorder and participate in, practiced thrift cost, and the non-compression video of the direct acquisition camera output of video frequency collection card can not bring influence to picture quality.
Embodiment five
In the method for embodiment four, also comprise: the audio video synchronization separation module is isolated the horizontal-drive signal and the vertical synchronizing signal of reference video signal from the reference video signal of input, and outputs to timing code generation memory module; Then; Step S606 comprises: in the predetermined amount of time after each reference video frame begins; If received the LTC timing code of LTC timing code receiver module input; Then timing code generation memory module is updated to the LTC timing code of input with the value of current time code, so that as the timing code write memory of this frame video in the vision signal; If do not receive the LTC timing code of LTC timing code receiver module input, then timing code generation memory module increases by 1 frame with the value of current time code, so that as the timing code write memory of this frame video in the vision signal; Wherein, the time started of each reference video frame is confirmed that by vertical synchronizing signal predetermined amount of time is confirmed by horizontal-drive signal.
From above description; Can find out; The utility model the above embodiments have realized following technique effect: video frequency collection card has the LTC timing code receiver module of the LTC timing code that can directly receive video camera output; And can directly receive the video reception processing module of gathering vision signal, thereby, can be when gathering video image; Be that each frame video image collect preserves video camera LTC timing code of output synchronously, make computer acquisition to video file can directly be used to support the later stage program making of timing code.Because video frequency collection card is the vision signal and the LTC timing code of acquisition camera output directly, need not video tape recorder and participate in, practiced thrift cost, and the non-compression video of the direct acquisition camera output of video frequency collection card can not bring influence to picture quality.
The preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (5)
1. a video frequency collection card is characterized in that, comprising: video reception processing module, LTC Longitudinal Time Code LTC timing code receiver module, timing code generation memory module and bus control interface, wherein:
Said video reception processing module is connected with said bus control interface with video camera, is used to receive the vision signal of said video camera output, and said vision signal is write the internal memory of computer through said bus control interface;
Said LTC timing code receiver module is connected with said video camera, is used to receive the LTC timing code of said video camera output, and said LTC timing code is exported to said timing code generation memory module;
Said timing code generation memory module is connected with said bus control interface with said LTC timing code receiver module, is used for said LTC timing code is preserved as the timing code of said vision signal, so that write said internal memory through said bus control interface.
2. video frequency collection card according to claim 1 is characterized in that, also comprises: the audio video synchronization separation module; Wherein:
Said audio video synchronization separation module is connected with said timing code generation memory module, is used for isolating the horizontal-drive signal and the vertical synchronizing signal of said reference video signal from the reference video signal of input, and outputs to said timing code generation memory module.
3. video frequency collection card according to claim 1 is characterized in that, said video reception processing module comprises:
The video reception module is connected with said video camera, is used to receive the vision signal of said video camera output, convert said vision signal into the parallel digital video signal after, export to screen buffer;
Said screen buffer is connected with said video reception module, is used for said parallel digital video signal is carried out buffer-stored;
The direct memory access dma controller is connected with said bus control interface with said screen buffer, is used for the parallel digital video signal of said screen buffer is read, and writes said internal memory through said bus control interface.
4. video frequency collection card according to claim 1 is characterized in that, also comprises: LTC timing code input interface and LTC timing code output interface, wherein:
Said LTC timing code receiver module is connected with said video camera through said LTC timing code input interface;
Said LTC timing code output interface is connected with said LTC timing code input interface, is used for the LTC timing code ring logical output of said video camera through said LTC timing code input interface input.
5. video frequency collection card according to claim 1 is characterized in that, said bus control interface is connected on the said system for computer bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120553238 CN202524491U (en) | 2011-12-27 | 2011-12-27 | Video acquisition card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120553238 CN202524491U (en) | 2011-12-27 | 2011-12-27 | Video acquisition card |
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| CN202524491U true CN202524491U (en) | 2012-11-07 |
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| CN 201120553238 Expired - Lifetime CN202524491U (en) | 2011-12-27 | 2011-12-27 | Video acquisition card |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188473A (en) * | 2011-12-27 | 2013-07-03 | 北京同步科技有限公司 | Video capture card and processing method thereof |
| CN112437240A (en) * | 2021-01-27 | 2021-03-02 | 南京美乐威电子科技有限公司 | Video frame and time code binding method, video file recording method and encoder |
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2011
- 2011-12-27 CN CN 201120553238 patent/CN202524491U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188473A (en) * | 2011-12-27 | 2013-07-03 | 北京同步科技有限公司 | Video capture card and processing method thereof |
| CN103188473B (en) * | 2011-12-27 | 2015-10-21 | 北京同步科技有限公司 | Video frequency collection card and processing method thereof |
| CN112437240A (en) * | 2021-01-27 | 2021-03-02 | 南京美乐威电子科技有限公司 | Video frame and time code binding method, video file recording method and encoder |
| CN112437240B (en) * | 2021-01-27 | 2021-04-09 | 南京美乐威电子科技有限公司 | Video frame and time code binding method, video file recording method and encoder |
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Granted publication date: 20121107 |