CN101867825A - Device for circularly monitoring multi-channel video and method thereof - Google Patents
Device for circularly monitoring multi-channel video and method thereof Download PDFInfo
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Abstract
The invention relates to a device for circularly monitoring a multi-channel video and a method thereof. The invention can extract an inputted multi-channel video signal into a still image sequence, code the sequence with a coder, and dynamically distribute bandwidth according to the priority level of each channel video signal. When the video signal to be monitored is an analog signal, the N-channel analog signal is passed through an analog multi-channel switch, a multi-channel standard video signal is multiplexed into one-channel nonstandard video signal under the control of a selecting signal generated by a control chip, the analog video signal is conversed into a digital video signal through a video A/D conversing module, and the digital video signal is transmitted an image coding chip; and when the video signal to be monitored is an digital signal, an N-channel digital signal to be monitored is entered into a digital multi-channel switch through a digital interface, the digital signal is switched and image acquired under the control of a selecting signal generated by a control chip, the digital signal is multiplexed in an interleaving way to be one-channel nonstandard video signal, and the nonstandard video signal is transmitted into an image coding chip. The invention saves the bandwidth, and greatly improves the use ratio of an image coder.
Description
Technical field
The present invention relates to a kind of devices and methods therefor of picture control, this invention can be extracted into the rest image sequence with the multi-channel video signal of input, encodes with an encoder, and dynamically distributes bandwidth according to the priority of each road vision signal.
Background technology
At present, known picture control equipment is made up of video capture device, communication network, memory device, display device.The video information of video capture device collection directly returns by communication network, through these data after the Network Transmission or be stored in storage or the equipment that is shown directly shows.In majority monitoring occasion, continuous videos is carried out coding transmission, progressive video need take a large amount of transmission bandwidths and memory space in the middle of transmission, storing process.In monitoring for multi-channel video signal, majority used to multi-channel video independently gather, the method for absolute coding device, independent transmission, bring huge pressure to transmission bandwidth.
Summary of the invention
In order to overcome the deficiency that the conventional images watch-dog need take a large amount of transmission bandwidths and memory space, the invention provides a kind of one tunnel Video processing and transmission channel utilized and carry out device (hereinafter referred to as " taking out the frame device ") and method thereof that multi-channel video has the circularly monitoring of priority, this takes out the frame device can not only finish the multiple signals circularly monitoring, transmitted with the bandwidth of one tunnel vision signal and can reach 50 tunnel monitored signal at most, a large amount of transmission bandwidths and memory space have been saved, and can define the priority of each road vision signal voluntarily, allocated channel dynamically, the importance of monitored signal is depended in the setting of priority, and the monitored signal that priority is high will be that unit extracts collection with higher frequency with the field.The monitored signal of multichannel finally can be multiplexed with one road non-standard video signal, utilizes an image encoder to carry out compressed encoding, has further saved bandwidth, and the utilance of image encoder improves greatly.The coding of multi-channel video signal only adopts an image encoder, has saved equipment cost.
Solution of the present invention and technical scheme are: monitored multichannel video standard signal is carried out circle collection, become one tunnel off-gauge video sequence.If monitored vision signal is an analog signal, then N road analog signal is through analog multichannel switch, under the control of the selection signal that control chip (as single-chip microcomputer) produces with the vision signal of multichannel standard multiplexing be one road non-standard video signal, utilize video mould/number conversion chip to convert analog video signal to digital video signal subsequently, and deliver in the image encoding chip; If monitored signal is a digital signal, then the monitored digital signal in N road enters the digital multi-channel switch by digital interface, under the control of the selection signal that control chip produces, switch and IMAQ, interleave and be multiplexed with one road non-standard video signal and send into the image encoding chip.Whole device only adopts an image encoder to carry out compressed encoding, finally generates a compressed rest image sequence.
Image in this image sequence is that circulation is extracted from the multi-channel video of gathering, and can truly reflect the content of gathering video.Difference is, the frame frequency (perhaps field frequency) of the more original video of image sequence that forms after extracting has reduced, for example the frame frequency of cable TV signal is 25 frame/seconds (50/second), collection through this device, when the frame frequency of every road signal is reduced to 1 frame/second (perhaps 1/second), if only transmit strange or even field information, then can transmit the information of the monitored signal in 25-50 road in the bandwidth of one road signal, if transmit whole frame information, (the 25 tunnel is theoretical peak then can to transmit the information of the monitored signal in 12-25 road in the bandwidth of one road signal, the switching that is every road signal all occurs in the moment that strange trace signal is about to begin, that is to say, information source is a synchronizing signal, can carry out seamless switching, if information source is a nonsynchronous signal, then can monitor way then can reduce, 12 the tunnel to be theoretical minimum, the switching of promptly every road signal all occurs in the moment that strange trace signal just begun, and must wait for that the time of a frame switches again).Signal can have different priority according to the difference of monitored information or location prominence, and reduces or the raising frame frequency, dynamically occupies different bandwidth.
The sequential chart of non-standard video signal is shown in figure one.With four passages is example, the monitored signal of each passage of single-chip microcomputer poll and be the information source image that each passage is gathered by unit with the frame.After the strange field of passage 1 image finished with an idol trace transfer of data, variable connector switched to output passage 2 rapidly according to the selection signal of control chip output; When poll occurred in the field trace of passage 2 constantly, variable connector must be waited for after the even field flyback that detects passage 2 just can switch to this passage; (as passage among the figure 3) can be directly switch to this passage when poll occurs in strange field flyback; When poll occurred in even field flyback, variable connector need be waited until after an idol trace finishes just can switch to this passage.According to the method, take out the frame device and can finish multiway images signal interleaving to the single channel picture signal, form an off-gauge vision signal, the trace interval that every field picture trace interval of this vision signal is a standard, the retrace interval of adjacent two field picture signal can have nothing in common with each other.
Single-chip microcomputer has adopted different frequencies when each monitored signal is carried out poll, can realize two beneficial effects: it is one road signal that N road signal source is interleave, and whole device only needs a mould/number conversion chip and image encoding compression chip, reduction means volume; Realize the priority setting of N road signal source, the priority height, the frequency of poll is then high, on the contrary poll frequency is then low.With the maximum situation of priority is example: the priority of information source 1 is the highest, successively decreases successively, and the priority of information source N is minimum.Poll travels through all signal sources for the first time, then give up for the second time the minimum N road signal source of priority, only signal 1～(N-1) is carried out poll and switching,, the N-1 time poll information source 1～2, the N time poll has only first via signal source, then in one-period, the frequency that signal source is polled to is directly proportional with priority, and the size of the information occupied bandwidth of signal source is dynamic, and is directly proportional with priority.
Selecting signal is to utilize the interruption of single-chip microcomputer to produce.The sequential chart of vision signal and field blanking signal VBLKn, a parity field index signal FIDn as shown in Figure 4.With the interrupt source of VBLKn signal as single-chip microcomputer, the height of its level changes the interruption that can cause single-chip microcomputer, in the time of a two field picture, single-chip microcomputer can produce 4 interruptions, lay respectively at the 22nd, 311,334,624 row, approach strange trace picture signal starting point (23 row), strange trace picture signal end point (310 row), an idol trace picture signal starting point (336 row), an idol trace picture signal end point (623 row).Having no progeny during single-chip microcomputer enters and can judge current time according to the level state of VBLKn and FIDn, and then produce selection signal SELn, is the collection that unit carries out image with frame or field.
When switching to m road information source, corresponding selection signal SELm is a high level, and (n=1～N, and n ≠ m) is a low level to SELn.For digital source, in Digital Logical Circuits each road information source respectively with separately SELn with because SELn has one to be high level at one time at the most, thus with the result mutually or be a road final non-standard digital videos signal and export; For analog source, SELn exports the road output as non-standard analog video signal wherein as selecting signal that the input signal of all variable connectors is done selection.
Only need a Video processing path (to comprise a mould/number conversion chip in the analog signal of selecting to collect under the signal controlling, an image encoding chip) can finish the mould/number conversion and the image encoding compression process of the monitored video information of multichannel, and the digital signal that collects can be carried out the image encoding compression with same image encoding chip, the image encoding chip can be selected still image own coding chips such as JPEG or JPEG2000 for use, also can adopt MPEG, H.264 wait the moving picture chip also image to be encoded to be encoded as Intra frame (non-predictive frames).Final package unit can be exported a compressed rest image sequence, and this sequence has comprised the information of all monitored signals, can be with the bandwidth for transmission of one tunnel vision signal.
The invention has the beneficial effects as follows: the first, multi-channel video signal is recycled the rest image that extracts single frames and utilizes an image encoder to carry out image encoding through after taking out the frame device.The final output of taking out the frame device is the rest image sequence, and this sequence is the composograph according to the multi-channel video signal of some cycles circulation, and each width of cloth image can both reflect that picture control passage lock corresponding under this time point collects the truth of picture.The second, the more original video flowing of rest image sequence through overcompression of taking out the output of frame device has the characteristics of low code check, saves the transmission bandwidth required when monitoring and the order ground of memory space thereby reached.The 3rd, when control chip circulates switching and extraction multi-channel video signal single-frame images, priority can be set, select the monitored vision signal of high priority with higher frequency, make dynamically occupied bandwidth of each road vision signal.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 interleaves the sequential chart that is multiplexed into single channel non-standard video signal for the multichannel video standard signal;
Fig. 2 is that the hardware of the device of circularly monitoring multi-channel video connects block diagram;
Fig. 3 is the flow chart of single-chip microcomputer polling routine;
Fig. 4 is vision signal and VBLKn, FIDn signal corresponding diagram;
Fig. 5 is the ADV212 operational flowchart;
Fig. 6 is a single-chip microcomputer n paths interrupt routine flow chart (is acquisition units with the frame).
Embodiment
(1) takes out frame device hardware configuration
This device comprises image capture module, A/D conversion module and image coding module.Image capture module interleaves the multichannel video standard signal and is multiplexed into single channel non-standard video signal, embodies the priority of monitored signal simultaneously; The A/D conversion module becomes digital signal with the non-standard video signal mode/number conversion of image capture module output; Image coding module is carried out image compression encoding, finally exports the data flow of composograph.
Image capture module (if signal source is an analog signal, can adopt analog multichannel switch by control chip (the AVR series monolithic or the ARM chip that can adopt atmel corp to produce), variable connector; If signal source is a digital signal, can adopt Digital Logical Circuits to realize the multichannel switching) form; The A/D conversion module is made up of video mould/number conversion chip (can adopt TI company to produce the SAA7111 of TVP5150, TVP5154, PHILIPS company); Image coding module is made up of special image coding chip (can adopt JPEG, JPEG2000, MPEG, H.264 wait the special image coding chip).Its concrete composition structure as shown in Figure 2.
In the image capture module, (n=1～N) input pin with analog multichannel switch or digital multi-channel switch links to each other for monitored analog signal An or digital signal CHn_Y0～7, variable connector carries out the switching and the IMAQ of multiple signals under the control of single-chip microcomputer, for reaching this purpose, the field blanking signal VBLKn that should comprise incoming video signal in the input signal of control chip, information such as parity field index signal FIDn, control chip is according to the field synchronization of controlled vision signal, information such as field blanking produce control signal SELn, and the control variable connector carries out the time division multiplexing of vision signal.
In the A/D conversion module, the non-standard video conversion of signals of mould/number conversion chip after with time division multiplexing is digital signal Y0～7, and non-standard digital videos signal Y0～7 enter the image encoding special chip output image sequence of encoding.
(2) taking out frame device firmware forms
Take out the core control program that frame device firmware is a chip internal, main responsible realization interleaves multichannel rule vision signal and is multiplexed into the non-regular vision signal of single channel and carries out image encoding.The basic function of taking out the frame device realizes by internal firmware, and its firmware relates to control chip (is example with the AVR single-chip microcomputer) in the image capture module and the image encoding chip (is example with ADV212) in the image coding module.
1, single-chip microcomputer firmware
The control program of single-chip microcomputer comprises several sections: initialization, state machine and the Interrupt Process of the switching of the band priority of the initialization of single-chip microcomputer own, information source vision signal, mould/number conversion chip.
Fig. 3 is the flow chart of Single Chip Microcomputer (SCM) program.Its flow process is as follows:
(1), the initialization of singlechip;
(2), the initialization of mould/number conversion chip;
(3), set the priority of each vision signal;
(4), determine the value of select according to the priority of information source vision signal;
(5), according to the value selector channel of variable select, the value of count1, count2 is made as 0, open the interruption of selected passage;
(6), judge whether to finish the collection of a frame complete image, promptly the value of count1, count2 is 1 all, is then to enter step (4), otherwise continues to wait for and finish until collection.
The initialization of single-chip microcomputer itself comprises: house dog initialization, the initialization of I/O pin and interruption initialization.
The AVR single-chip microcomputer is divided into following step to the initialization of mould/number conversion chip (is example with TVP5154):
(1), waits at least 1 millisecond.To the address is that the register of 0x7FH writes 0x00H and starts any coding pass;
(2), wait at least 1 millisecond.By IIC is the register value of 0x81H from the address;
(3), whether the value that reads in rapid of checking previous step is 0x54H.Not that then the RESET pin by TVP5154 resets, repeat 1～3 then.Be then to represent the initialization success, enter next step;
(4), wait at least 1 millisecond.To the address is the register value of writing 0x01 of 0x30, and output format is set at ITU-RBT656.3;
(5), read the value that the address is the register of 0x8c, when this value is not 0, be version number;
(6), successively finish the assignment of related register, should delay time 1 millisecond at least between each step.
The poll according to priority of information source vision signal, can realize two beneficial effects: it is one road signal that N road signal source is interleave, whole device only needs a mould/number conversion chip and image encoding compression chip, reduction means volume; Realize the priority setting of N road signal source, the priority height, the frequency of poll is then high, on the contrary poll frequency is then low.Implementation step is:
(1), N road signal source is provided with different priorities.With the maximum situation of priority is example, and the priority of information source 1 is the highest, successively decreases successively, and the priority of information source N is minimum.
(2), the control device single-chip microcomputer carries out poll to signal, the signal that is polled to is chosen by the select signal.Poll travels through all signal sources for the first time, then give up for the second time the minimum N road signal source of priority, only signal 1～(N-1) is carried out poll and switching,, the N-1 time poll information source 1～2, the N time poll has only first via signal source, then in one-period, the frequency that signal source is polled to is directly proportional with priority, and the size of the information occupied bandwidth of signal source is dynamic, and is directly proportional with priority.
The state machine major function is to judge whether to finish an image frame grabber at a certain passage:
(1) definition status variable count1, count2 (global variable) are used to indicate the state of present image.Work as count1=0, presentation video does not begin transmission during count2=0; Count1=1, count2=0, effectively image begins; Count1=1, count2=1, effectively image finishes.
(2) count1 under the initial condition, count2 are 0.Have no progeny in opening, wait for and interrupting.
(3) have no progeny in entering, judge whether to be in effective image initial state, be then to export this road to select signal SEL, and count1 is changed to 1, withdraw from interruption; Otherwise judge whether to be in end of transmission state, be then the selection signal SEL of this road signal correspondence to be closed, and count2 is changed to 1, withdraw from interruption.
(4) enter above-mentioned two interrupt statuss successively, just can finish the collection of piece image, with count1, count2 is changed to 0.
Interrupt Process is to select signal SELn according to the state generation of VBLKn, FIDn signal.The sequential chart of vision signal and VBLKn, FIDn and shown in Figure 4.The external interrupt pin of single-chip microcomputer links to each other with VBLK1～4.VBLK1～4 are providing just/contrary information, and the height of its level changes can cause the interruption of single-chip microcomputer, and then enters interrupt handling routine.
The Interrupt Process flow chart is described below as shown in Figure 6:
(1) closes interruption.
When broken hair was given birth to (2), according to the value of current select, judging was the interruption which passage produces, and enters corresponding handling procedure.The processing method unanimity of different video channels is as (3)～(6).
(3) judge that VBLKn, the FIDn on this road and count1 draw current state of living in.When image is in effective image initial state, jump to step (4); When image is in end of transmission state, go to step (5); Other state then jumps to (6).
(4), will export and select signal SEL to be made as corresponding monitored vision signal to allow output, count1=1 withdraws from interruption after opening interruption.
(5), will export and select signal SEL to close, count2=1 withdraws from interruption.
(6), open interruption, withdraw from interruption.
In the time of a two field picture, single-chip microcomputer can produce 4 interruptions, lay respectively at the 22nd, 311,334,624 row, approach strange trace picture signal starting point (23 row), strange trace picture signal end point (310 row), an idol trace picture signal starting point (336 row), an idol trace picture signal end point (623 row).If with a frame is unit images acquired information, then the beginning of image switching and extraction, end point are respectively the 22nd, 624 row, have no progeny in entering, single-chip microcomputer is judged the state of current VBLKn, FIDn signal, if satisfy VBLKn is that low level, FIDn are high level, then will select signal SEL to be made as this road information source and allow output,, then will select signal at stop if VBLKn is that high level, FIDn are low level; If with strange is unit images acquired information, then the beginning of image switching and extraction, end point are respectively the 22nd, 311 row, have no progeny in entering, if satisfy VBLKn is that high level, FIDn are high level, then will select signal SEL to be made as this road information source and allow output, if VBLKn is that high level, FIDn are high level, then will select signal at stop; If with the idol field is unit images acquired information, then the beginning of image switching and extraction, end point are respectively the 334th, 624 row, have no progeny in entering, if satisfy VBLKn is that low level, FIDn are low level, then will select signal SEL to be made as this road information source and allow output, if VBLKn is that high level, FIDn are low level, then will select signal at stop.
When switching to m road information source, corresponding selection signal SELm is a high level, and (n=1～N, and n ≠ m) is a low level to SELn.For digital source, in Digital Logical Circuits each road information source respectively with separately SELn with because SELn has one to be high level at one time at the most, thus with the result mutually or be a road final non-standard digital videos signal and export; For analog source, SELn exports the road output as non-standard analog video signal wherein as selecting signal that the input signal of all variable connectors is done selection.
2, ADV212 firmware
Fig. 5 is the operational flowchart of ADV212 under 32-Bit Normal Host Mode Encode pattern.Take out in the frame and ADV212 finished the operating procedure among the figure by primary processor:
(1), promptly the work clock of ADV212 is carried out after resetting.The operating data handbook, the JCLK of ADV212, HCLK are set to 108MHz and 54MHz respectively herein;
(2), wait for 20 microseconds after, write 0x008a to BOOT register (address is 0x0D), ADV212 is set to NO-BOOT HOST pattern;
(3), register BUSMODE (address is 0x08) and MMODE (address is 0x09) are arranged to 0x000a, host data width, DMA data width, indirect data width, the address increment of ADV212 all are set at 32bit, and address setting is increased pattern for oneself;
(4), firmware encode_2_13_0.sea is downloaded to that indirect address is the 0x00050000 place in the ADV212 by register IADDR (address is 0x0B) and IDATA (address is 0x0C);
(5), write 0x008D, ADV212 is set to Co-processor boot pattern to the BOOT register.
(6), repeating step 3;
(7), the method to set up with reference to the ADV212 indirect register is provided with coding parameter.As shown in the table to being provided with of relevant parameter under little endian mode:
| The position | Value |
| ??0x57F00 | ??0x01000503 |
| ??0x57F04 | ??0x00000400 |
| ??0x57F08 | ??0x02000500 |
| ??0x57F0C | ??0x00010001 |
(8), write 0x00400000, the threshold value with data FIFO is made as 64 words to indirect register FFTHRC (indirect address is 0xFFFF141C);
(9), EIRQIE register (address is 0x05) is made as 0x0402, open SWIRQ0 and data FIFO overflow indicator;
(10), check and the 10th of EIRQFLG register (address is 0x06) put 1 until this position, enter next step;
(11), read the value of SWFLAG register (address is 0x07), whether checking is 0xFF82, is then to represent ADV212 initialization success;
(12), write 0xFFFF, make ADV212 begin coding to the EIRQFLG register;
(13), check IRQ pin (144-Ball Package G10 pin).Effective when interrupting, promptly this pin is output as when hanging down, and reads 64 digital data continuously from CODE register (address is 0x01);
(14), redirect value step 13 after the EIRQFLG register writes 0x0002.
00 00 00 0C are the origin identification symbol of piece image in the data flow of ADV212 input, with FF D9 is end identifier, and the data between origin identification symbol and the end identifier (containing origin identification symbol and end identifier) are the valid data of a width of cloth through the JPEG2000 compressed images.After data are read, be saved as the JP2 form, promptly finished the work of taking out frame.
Claims (4)
1. the device of a circularly monitoring multi-channel video is characterized in that:
Analog multichannel switch connection mode/number conversion chip, mould/number conversion chip connects control chip, and control chip connects an image encoding chip; Perhaps the digital multi-channel switch connects control chip, and control chip connects an image encoding chip.
2. application rights requires 1 described device to carry out a kind of method of circularly monitoring multi-channel video, it is characterized in that: when monitored vision signal is an analog signal, then N road analog signal is through analog multichannel switch, under the control of the selection signal that control chip produces with the vision signal of multichannel standard multiplexing be one road non-standard video signal, utilize video mould/number conversion chip to convert analog video signal to digital video signal subsequently, and deliver in the image encoding chip; When monitored signal is a digital signal, then the monitored digital signal in N road enters the digital multi-channel switch by digital interface, under the control of the selection signal that control chip produces, switch and IMAQ, interleave and be multiplexed with one road non-standard video signal and send into the image encoding chip; Whole device only adopts an image encoder to carry out compressed encoding, finally generates a compressed rest image sequence.
3. method according to claim 2 is characterized in that:
Every road signal has different priority according to the difference of monitored information or location prominence, important raising frame frequency, unessential reduction, in one-period, the frequency that signal source is polled to is directly proportional with priority, the size of the information occupied bandwidth of signal source is dynamic, and is directly proportional with priority.
4. method according to claim 2 is characterized in that, the sequential of the monitored digital signal in N road is as follows: the N road is a N passage,
Unit in images acquired is under the situation of a frame, and after the strange field and an idol trace transfer of data of passage 1 image finished, variable connector switched to output passage 2 rapidly according to the selection signal of control chip output; When poll occurred in the field trace of passage 2 constantly, variable connector must be waited for after the even field flyback that detects passage 2 just can switch to this passage; When poll occurs in strange field flyback, can be directly switch to this passage; When poll occurred in even field flyback, variable connector need be waited until after an idol trace finishes just can switch to this passage; According to the method, finish N road picture signal successively to the interleaving of single channel picture signal, form an off-gauge vision signal.
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| CN105939492A (en) * | 2016-06-15 | 2016-09-14 | 乐视控股（北京）有限公司 | Method and device for playing video based on multi-path program streams |
| CN108419191A (en) * | 2017-02-09 | 2018-08-17 | 钰太芯微电子科技（上海）有限公司 | A kind of pick up facility based on time-sharing multiplex interface |
| CN107770500A (en) * | 2017-11-17 | 2018-03-06 | 桂林电子科技大学 | The non-standard video agreement Transmission system and transmission method of Camera Link interfaces based on FPGA |
| CN109672869A (en) * | 2019-02-11 | 2019-04-23 | 湖南国科微电子股份有限公司 | A kind of time-sharing multiplex image processing apparatus, method and electronic equipment |
| CN111954031A (en) * | 2019-05-14 | 2020-11-17 | 西安光启未来技术研究院 | Method and system for dynamically adjusting video stream extraction frame rate |
| CN111954031B (en) * | 2019-05-14 | 2024-04-30 | 西安光启智能技术有限公司 | Method and system for dynamically adjusting frame extraction rate of video stream |
| CN111294562A (en) * | 2020-02-24 | 2020-06-16 | 浙江大华技术股份有限公司 | Analog video processing method, system and device |
| CN113382213A (en) * | 2021-08-13 | 2021-09-10 | 北京伟杰东博信息科技有限公司 | Video monitoring system and monitoring method thereof |
| CN113382213B (en) * | 2021-08-13 | 2021-11-02 | 北京伟杰东博信息科技有限公司 | Video monitoring system and monitoring method thereof |
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