CN102186013A - Network monitoring equipment and pre-snapping method based on same - Google Patents
Network monitoring equipment and pre-snapping method based on same Download PDFInfo
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- CN102186013A CN102186013A CN 201110077479 CN201110077479A CN102186013A CN 102186013 A CN102186013 A CN 102186013A CN 201110077479 CN201110077479 CN 201110077479 CN 201110077479 A CN201110077479 A CN 201110077479A CN 102186013 A CN102186013 A CN 102186013A
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Abstract
The invention discloses network monitoring equipment, which comprises a video collection module and a central processing module. The equipment is characterized by further comprising a pre-snapping module, wherein the central processing module is connected with the pre-snapping module, and when a pre-snapped trigger signal is received, a pre-snapping command is sent to the pre-snapping module; and the pre-snapping module is connected with the video collection module, and when the pre-snapping command is received, pre-snapped picture data are obtained by snapping a video image which is collected by the video collecting module before the trigger signal. The invention also discloses a pre-snapping method based on the same. The method and the equipment can pre-snap the video image sent by a user before the trigger signal.
Description
Technical field
The present invention relates to the network monitoring technical field, particularly the pre-grasp shoot method of network monitoring device and watch-dog Network Based.
Background technology
Network monitoring is a kind of by web camera (IPC, IP Camera) etc. network monitoring device is caught image, and by network with image data transmission to as the supervisory control system of DVR (DVR) or network video machine (NVR) storage/control appliance of etc.ing, be characterized in that the image of monitoring transmits and preservation with digitized data mode.
Wherein, if will realize the digitlization of monitoring image, network monitoring device need possess digital signal processor (DSP, digital singnal processor), DSP can make amendment, delete, strengthen, encode the digital signal after mould/number conversion, processing such as decoding.
In existing network monitoring device, the functions such as grabgraf, decoding grabgraf that can realize encoding by dsp chip, the coding grabgraf is that DSP directly encodes and grabgraf to the video data of un-encoded; To be DSP extract from the video data of code storage the decoding grabgraf carries out grabgraf again after frame data are decoded.But from trigger the grabgraf signal to the beginning grabgraf may because of operational order postpone or customer responsiveness slow, take place suddenly and the very short incident of holding time and miss some.
Though existing network monitoring device can be realized the pre-recording function of dynamic video, but for application scenarios such as picture family, Internet bar, bank ATM machine, road traffics, the user often needs the long-range in real time view data of obtaining monitoring, because the data volume of video data is bigger, required data space, and the Network Transmission bandwidth is bigger, under the situation of or insufficient memory not ideal enough in network condition, transferring video content by network remote often needs long time, and its practical effect is very poor.
Under network condition and the unfavorable situation of memory space, reappearing user sends the triggering signal incident generating process of preceding long period fully, and take the less rest image of data volume and often can bring into play bigger effect, yet candid photograph for rest image, present network monitoring device also all can only be realized capturing the later picture of triggering signal (as the triggering signal of capturing) that the user sends, and then can't capture for the video image before the triggering signal.
Summary of the invention
The embodiment of the invention provides a kind of network monitoring device, the pre-candid photograph of the video image before the triggering signal that can realize the user is sent.
The embodiment of the invention provides a kind of pre-grasp shoot method of watch-dog Network Based, the pre-candid photograph of the video image before the triggering signal that can realize the user is sent.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of network monitoring device comprises: video acquisition module; Central processing module, wherein, this equipment further comprises pre-candid photograph module;
Described central processing module links to each other with described pre-candid photograph module, when receiving the triggering signal of pre-candid photograph, sends the pre-order of capturing to described pre-candid photograph module;
Described pre-candid photograph module links to each other with described video acquisition module, when receiving described pre-candid photograph order, carries out grabgraf by the video image that described video acquisition module was gathered before triggering signal, the image data of being captured in advance.
Preferably, described pre-candid photograph module comprises:
The unit of pre-recording, the digital of digital video data after the memory encoding conversion, and real-time update;
Digital signal processor DSP, link to each other respectively with described video acquisition module, central processing module and the unit of pre-recording, when the pre-candid photograph order that receives that described central processing module sends, extract the single frames video data grabgraf of decoding the digital of digital video data by the described unit storage of pre-recording before the triggering signal, the image data of being captured in advance.
Preferably, described pre-candid photograph module comprises:
DSP links to each other respectively with described video acquisition module and central processing module, to the video image of the described video acquisition module collection grabgraf of encoding, and the image data that obtains is sent to memory cell; When the order of the pre-candid photograph that receives described central processing module transmission, from the image data of cell stores, obtain the picture that the video image before the triggering signal has been grasped, thus the image data of being captured in advance;
Memory cell links to each other with described DSP, the image data that storage receives from described DSP.
Preferably, described DSP comprises:
The grabgraf unit, link to each other respectively with the unit of pre-recording with described central processing module, described grabgraf unit is when the pre-candid photograph order that moment t receives that described central processing unit sends, the video recording extracting data time of storing from the described unit of pre-recording is t-T single frames video recording data constantly, and the grabgraf of decoding; And upgrade the value of N and t at updating block after, continue to carry out the described single frames video recording data that are the t-T moment from the described video recording extracting data time of pre-recording the unit storage at every turn, and the operation of the grabgraf of decoding, be 0 up to N;
Updating block links to each other with described grabgraf unit, after the operation of described decoding grabgraf is finished in described grabgraf unit at every turn, upgrades the value of N and t, makes N=N-1, t=t-T; Up to N is 0;
Described N is predefined pre-candid photograph number of times; T is predefined blanking time.
Preferably, described memory cell comprises:
Preserve subelement, link to each other,, carry out the described image data that once receives the DSP candid photograph, this image data is deposited in operation according to the picture-storage position of the numbering appointment of image data every predefined blanking time with described DSP;
Flag bit is provided with subelement, link to each other with described preservation subelement, the corresponding mark position of image data that current described preservation subelement is received is a state one, and the mark position of the image data correspondence that a last described preservation subelement is received is a state two;
Numbering is upgraded subelement, links to each other with described preservation subelement, after operation according to the picture-storage position of the numbering appointment of image data is deposited in image data in each described preservation subelement execution, upgrades the numbering of described image data.
A kind of pre-grasp shoot method of watch-dog Network Based, this method comprises:
The video image that reception collects;
When receiving the triggering signal of pre-candid photograph, by the video image of gathering before the described triggering signal is carried out grabgraf, the image data of being captured in advance.
Preferably, during the described triggering signal that receives pre-candid photograph, by the video image of gathering before the triggering signal is carried out grabgraf, the image data of being captured in advance comprises:
When receiving the triggering signal of pre-candid photograph, the video recording extracting data single frames video data of pre-recording before the triggering signal by the DSP grabgraf of decoding, the image data of being captured in advance.
Preferably, during the described triggering signal that receives pre-candid photograph, by the video image before the triggering signal is carried out grabgraf, the image data of being captured in advance comprises:
, and the image data that obtains stored in real time to the described video image grabgraf of encoding by DSP;
When receiving the triggering signal of pre-candid photograph, from the image data of storage, obtain the picture that DSP has grasped the video image before the triggering signal, the image data of being captured in advance.
Preferably, the video recording extracting data single frames video data that described DSP pre-records before the triggering signal grabgraf of decoding, the image data of being captured in advance comprises:
When moment t received the triggering signal of pre-candid photograph, DSP was t-T single frames video recording data constantly from video recording extracting data time of the module stores of pre-recording, and the grabgraf of decoding;
Upgrade the value of N and t, make N=N-1, t=t-T;
Repeating described extraction time is t-T single frames video recording data constantly, and the grabgraf of decoding, and the value of upgrading N and t, makes N=N-1, t=t-T; Step, be 0 up to N;
Wherein, N is predefined pre-candid photograph number of times, and T is predefined blanking time.
Preferably, described storage comprises:
Receive the described image data that DSP captures, image data is deposited in picture-storage position according to the numbering appointment of image data;
With the corresponding mark position of this image data is state one, and is state two with the mark position of a last image data correspondence;
Upgrade the numbering of described image data;
Continue to carry out above steps after waiting for predefined blanking time.
As seen from the above technical solutions, the pre-grasp shoot method of this network monitoring device of the present invention and watch-dog Network Based, coding grabgraf by utilizing the existing network watch-dog or decoding grabgraf and pre-recording function can be realized the video image of gathering before the described triggering signal is carried out grabgraf, the image data of being captured in advance, thus realize the pre-function of capturing; Make that network monitoring device can be under relatively poor network and storage condition, the also complete procedure before and after the triggering signal sent of reappearing user fully, the effect that performance is bigger than pre-recording.
Description of drawings
Fig. 1 is the network monitoring device structural representation of the embodiment of the invention one;
Fig. 2 is the concrete operations flow chart that the DSP of the embodiment of the invention one carries out.
Fig. 3 is the network monitoring device structural representation of the embodiment of the invention two;
Fig. 4 is the concrete operations flow chart that the memory cell of the embodiment of the invention two is carried out;
Fig. 5 is the DSP module concrete structure schematic diagram of the embodiment of the invention one;
Fig. 6 is the memory cell concrete structure schematic diagram of the embodiment of the invention two.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
The present invention mainly is when receiving the triggering signal of pre-candid photograph, by the video image of gathering before the described triggering signal being carried out grabgraf, the image data of being captured in advance, thereby the pre-function of capturing of realization.For example to comprise the video acquisition module that is used to gather video image and be used to receive outer signals and the network monitoring device of the central processing module that each module is controlled in network monitoring device, a pre-module of capturing can be set in this equipment; Wherein, when described central processing module receives the triggering signal of pre-candid photograph, send the pre-order of capturing to described pre-candid photograph module; Described pre-candid photograph module is used for when receiving described pre-candid photograph order, by the video image of gathering before the described triggering signal is carried out grabgraf, the image data of being captured in advance.Thereby realize the pre-function of capturing.
Under the invention described above general technical thought, different the present invention at the watch-dog performance can realize by multiple scheme, have the decoding grabgraf of digital video and pre-recording function with watch-dog respectively below, and the two kinds of situations of decoding function that do not possess digital video are example, specifically describe implementation of the present invention.
Can take pre-candid photograph scheme shown in Figure 1 for the network monitoring device with decoding digital video grabgraf and pre-recording function, as shown in Figure 1, network monitoring device is mainly by central processing module 101, video acquisition module 102 with capture module 103 in advance and form.
Wherein capturing module 103 in advance comprises: the DSP104 and the unit 105 of pre-recording,
DSP104, link to each other respectively with described video acquisition module 102, central processing module 101 and the unit 105 of pre-recording, when the pre-candid photograph order that receives that central processing module 101 sends, receive from central processing module 101 and to extract the single frames video data grabgraf of decoding, the image data of being captured in advance before the triggering signal the digital of digital video data by described unit 105 storages of pre-recording.
The unit 105 of pre-recording can be a random-access memory (ram) that distributes separately, is used to store digital of digital video data and real-time update through the DSP104 code conversion, promptly realizes existing pre-recording function.It is emphasized that this module is different with the memory device (not shown in figure 1) that is used for special storage video recording, at first its read or write speed is faster than generic storage equipment (as hard disk, various storage cards etc.), secondly it has strict restriction to the video recording size of data of storage, when the video recording size of data exceeds restriction, can abandon video recording data early and note up-to-date video recording data, and video recording Data Update frequency is far longer than memory device (can be as accurate as Millisecond), the data so that preservation is in real time recorded a video.
For above-mentioned this network monitoring device, be that the pre-recording function that utilizes the decoding grabgraf function that its DSP possesses and the unit of pre-recording to possess is realized pre-the candid photograph, promptly when receiving the triggering signal of pre-candid photograph, utilize the decoding grabgraf function of DSP, extract the single frames video data grabgraf of decoding the digital of digital video data of before the triggering signal of pre-candid photograph, pre-recording, the image data of being captured in advance, wherein the concrete operations of DSP104 execution comprise the steps: as shown in Figure 2
Step 202 is to the single frames video recording data of the extracting grabgraf of decoding.
Step 204 judges whether N is 0, process ends then in this way, otherwise return step 201.
In the above-mentioned steps, N is predefined pre-candid photograph number of times, and T is predefined blanking time.
The concrete structure of DSP104 wherein can specifically comprise as shown in Figure 5:
Updating block 502 links to each other with described grabgraf unit 501, after the operation of described decoding grabgraf is finished in described grabgraf unit 501 at every turn, upgrades the value of N and t, makes N=N-1, t=t-T; Up to N is 0;
Wherein, described N is predefined pre-candid photograph number of times; T is predefined blanking time.
For some network monitoring device, owing to the DSP performance limitations, do not possess the function of the decoding grabgraf of digital video, at this kind equipment, can adopt pre-candid photograph scheme as shown in Figure 3.
As shown in Figure 3, in network monitoring device, comprise central processing module 301, video acquisition module 302 equally and capture module 303 in advance.Compare with scheme shown in Figure 1, in the scheme shown in Figure 3, central processing module 301 is identical with the function of video acquisition module 303, repeats no more here, and its difference is to capture in advance the concrete structure and the function of module 303.
Wherein, capture module 303 in advance and comprised DSP304 and memory cell 305;
DSP303 links to each other respectively with described video acquisition module 302 and central processing module 301, the real-time video image that video acquisition module 302 the is gathered grabgraf of encoding, and the image data that grabgraf obtains is sent to memory cell 305 store; When receiving the order of the pre-candid photograph that central processing module 301 sends, from the image data of memory cell 305 storage, obtain before the triggering signal that central processing module 301 receives pre-candid photograph, to the picture that video image has grasped, the image data of the pre-candid photograph that obtains;
For example memory cell 305 can be according to the memory location of the numbering appointment of image data, the image data that receives is stored, whenever receive a pictures and when storing, the corresponding flag bit of the current image data of receiving is set to state one, and the flag bit of a last image data correspondence that receives is set to state two, and state one, two can be used to distinguish whether this picture of expression is up-to-date one; Upgrade the numbering of image data then, make next pictures that receives to use the specified position of picture numbering after the renewal to store, constantly repeat said process, can finish storage and the renewal of image data being carried out first in first out.Certainly, the picture renewal can not be real-time, and certain hour upgrades once at interval, promptly repeats store picture data again, flag bit is set and upgrades the operation that picture is numbered after waiting for a default blanking time after the numbering of upgrading picture.
Similar with the unit 105 of pre-recording shown in Figure 1, when the total capacity size of the image data of storage exceeds the restriction of memory cell 305 in the memory cell 305, can abandon pre-candid photograph picture early and preserve up-to-date pre-candid photograph picture, every pre-memory address prePic[i that captures picture in this example, is described for convenient] expression, flag bit is with isLatestFlag[i] expression, wherein i represents the picture numbering, and 0＜=i＜N, i are integer.
Wherein, the concrete workflow of memory cell 305 comprises the steps: as shown in Figure 4
Step 401 will be used to deposit the RAM memory space that N opens pre-candid photograph picture and empty, and the flag bit of memory address correspondence in this RAM memory space all will be changed to false FALSE.
Step 402 is numbered i with picture and is changed to 0.
Step 403 receives the image data that DSP303 sends.
Step 404 is deposited in prePic[i with this image data] corresponding address.
Step 405 is with the mark isLatestFlag[i of this image data correspondence] be changed to true TRUE, and with the flag bit isLatestFlag[(i+N-1 of a last image data) %N] be changed to FALSE.
Step 406 will be moved one behind the picture-storage position, promptly put i=(i+1) %N.
Step 407 waits for that T (T is the pre-set interval time) returns step 403 after second.
Step 401 in the above-mentioned steps～402 are the initialization procedure of memory cell 305, and nonessential, only need to carry out when perhaps receiving initialization command when starting shooting as network monitoring device or restarting.
In the above-mentioned steps 405, % means modular arithmetic and promptly gets surplusly, and (i+N-1) to represent that (i+N-1) gets N surplus for %N; For example N gets 10, then when i=0, can be with flag bit isLatestFlag[9] be changed to FALSE, during i=1, can be with flag bit isLatestFlag[0] be changed to FALSE; By that analogy, thus realize that the mark position with a last image data is FALSE.
In the above-mentioned steps 406, % also means modular arithmetic and promptly gets surplusly, and (i+1) to represent that (i+1) gets N surplus for %N; For example N gets 10, during then current i=9, puts i=0; During current i=0, put i=1; By that analogy, thus realize moving one behind the picture-storage position.
Pass through above-mentioned steps, what memory cell 305 was stored is interior N pictures data of nearest N * T time all the time, when central processing module 301 receives the triggering signal of pre-candid photograph during second at t, will send image data and extract order to memory cell, the N pictures of being exported by memory cell 305 is from t-N * interior N of T second to t moment second and opens pre-candid photograph picture afterwards, every pre-capture picture be spaced apart T second, thereby realize pre-function of capturing.
The concrete structure of memory cell 305 wherein can specifically comprise as shown in Figure 6:
Preserve subelement 601, link to each other,, carry out the described image data that once receives the DSP303 candid photograph, this image data is deposited in operation according to the picture-storage position of the numbering appointment of image data every predefined blanking time with described DSP303; Wherein, corresponding with the concrete workflow of said memory cells 305, the numbering of image data can represent with i, can use prePic[i according to the picture-storage position of the numbering appointment of image data] expression; Can represent with T predefined blanking time.
Flag bit is provided with subelement 602, link to each other with described preservation subelement 601, the corresponding mark position of image data that current described preservation subelement 601 is received is a state one, and the mark position of the image data correspondence that a last described preservation subelement 601 is received is a state two; Wherein, corresponding with the concrete workflow of said memory cells 305, the mark of photo current data correspondence can be used isLatestFlag[i] expression, state one can be true TRUE, the flag bit of a last image data can be used isLatestFlag[(i+N-1) %N] expression, state two can be FALSE.
Numbering is upgraded subelement 603, link to each other with described preservation subelement 601, after carrying out the operation of image data being deposited in according to the picture-storage position of the numbering appointment of image data at each described preservation subelement 601, upgrade the numbering of described image data, wherein, corresponding with the concrete workflow of said memory cells 305, the operation of upgrading the numbering of described image data can be to put i=(i+1) %N, wherein, described N is predefined pre-candid photograph number of times.
It is to be noted, the network monitoring device that adopts Fig. 3 scheme is except that being used to store the memory cell of pre-candid photograph picture, also can also have the independent memory space or the memory module that can realize pre-recording function, this memory module can be preserved the video recording data of pre-recording in the current time certain hour, and continual renovation (adopting fifo mode equally).The scheme of Fig. 3 is not just because DSP has the function of decoding grabgraf, can not from the unit of pre-recording, extract the candid photograph of decoding of single frames video data, so the not shown module that can realize pre-recording function among Fig. 3, but be not that the network monitoring device that limits this scheme of use can not have such module.
In sum, contrast two kinds of schemes, scheme shown in Figure 1 requires DSP to have the function of decoding grabgraf, has only just to start pre-candid photograph action when pre-candid photograph triggering signal arrives, and is less for the increase of memory space and system resource overhead; And scheme shown in Figure 3 needs circulate regularly coding grabgraf of DSP, and opens up and outer ram space is used for store picture data, but the decoding capability of DSP is not required, and the scope of application is wider.
N in above-mentioned two kinds of schemes and T all can be according to concrete application demand and hardware condition settings.
In addition, in the foregoing description, DSP104, DSP305 all comprise the function that the video image of video acquisition module collection is encoded, but because irrelevant with inventive point of the present invention, so in the operation performed, be not described, but in fact this is the ability that all DSP all possess to DSP.
By the above embodiments as seen, the pre-grasp shoot method of this network monitoring device of the present invention and watch-dog Network Based, can realize capturing in advance function, and the pre-quantity of capturing and the time interval can be provided with arbitrarily within the specific limits according to real needs and hardware condition, the pre-image data that produces of capturing is compared the video recording data of pre-recording and producing, have take up room little, be easy to advantages such as preservation and transmission, under the situation of or insufficient memory not ideal enough in network condition, be convenient to network monitoring device and by Email (E-mail) or file transfer protocol (FTP) modes such as (FTP) it transmitted and preserve by it.Pre-realization of capturing function makes network monitoring device also can reappear the complete procedure of triggering signal front and back fully under relatively poor network and storage condition, the effect that performance is bigger than pre-recording.
Claims (10)
1. a network monitoring device comprises: video acquisition module; Central processing module is characterized in that, this equipment further comprises pre-candid photograph module;
Described central processing module links to each other with described pre-candid photograph module, when receiving the triggering signal of pre-candid photograph, sends the pre-order of capturing to described pre-candid photograph module;
Described pre-candid photograph module links to each other with described video acquisition module, when receiving described pre-candid photograph order, carries out grabgraf by the video image that described video acquisition module was gathered before triggering signal, the image data of being captured in advance.
2. network monitoring device as claimed in claim 1 is characterized in that, described pre-candid photograph module comprises:
The unit of pre-recording, the digital of digital video data after the memory encoding conversion, and real-time update;
Digital signal processor DSP, link to each other respectively with described video acquisition module, central processing module and the unit of pre-recording, when the pre-candid photograph order that receives that described central processing module sends, extract the single frames video data grabgraf of decoding the digital of digital video data by the described unit storage of pre-recording before the triggering signal, the image data of being captured in advance.
3. network monitoring device as claimed in claim 1 is characterized in that, described pre-candid photograph module comprises:
DSP links to each other respectively with described video acquisition module and central processing module, to the video image of the described video acquisition module collection grabgraf of encoding, and the image data that obtains is sent to memory cell; When the order of the pre-candid photograph that receives described central processing module transmission, from the image data of cell stores, obtain the picture that the video image before the triggering signal has been grasped, thus the image data of being captured in advance;
Memory cell links to each other with described DSP, the image data that storage receives from described DSP.
4. network monitoring device as claimed in claim 2 is characterized in that, described DSP comprises:
The grabgraf unit, link to each other respectively with the unit of pre-recording with described central processing module, described grabgraf unit is when the pre-candid photograph order that moment t receives that described central processing unit sends, the video recording extracting data time of storing from the described unit of pre-recording is t-T single frames video recording data constantly, and the grabgraf of decoding; And upgrade the value of N and t at updating block after, continue to carry out the described single frames video recording data that are the t-T moment from the described video recording extracting data time of pre-recording the unit storage at every turn, and the operation of the grabgraf of decoding, be 0 up to N;
Updating block links to each other with described grabgraf unit, after the operation of described decoding grabgraf is finished in described grabgraf unit at every turn, upgrades the value of N and t, makes N=N-1, t=t-T; Up to N is 0;
Described N is predefined pre-candid photograph number of times; T is predefined blanking time.
5. network monitoring device as claimed in claim 3 is characterized in that, described memory cell comprises:
Preserve subelement, link to each other,, carry out the described image data that once receives the DSP candid photograph, this image data is deposited in operation according to the picture-storage position of the numbering appointment of image data every predefined blanking time with described DSP;
Flag bit is provided with subelement, link to each other with described preservation subelement, the corresponding mark position of image data that current described preservation subelement is received is a state one, and the mark position of the image data correspondence that a last described preservation subelement is received is a state two;
Numbering is upgraded subelement, links to each other with described preservation subelement, after operation according to the picture-storage position of the numbering appointment of image data is deposited in image data in each described preservation subelement execution, upgrades the numbering of described image data.
6. the pre-grasp shoot method of a watch-dog Network Based is characterized in that, this method comprises:
The video image that reception collects;
When receiving the triggering signal of pre-candid photograph, by the video image of gathering before the described triggering signal is carried out grabgraf, the image data of being captured in advance.
7. the pre-grasp shoot method of watch-dog Network Based as claimed in claim 6 is characterized in that, during the described triggering signal that receives pre-candid photograph, by the video image of gathering before the triggering signal is carried out grabgraf, the image data of being captured in advance comprises:
When receiving the triggering signal of pre-candid photograph, the video recording extracting data single frames video data of pre-recording before the triggering signal by the digital signal processor DSP grabgraf of decoding, the image data of being captured in advance.
8. the pre-grasp shoot method of watch-dog Network Based as claimed in claim 6 is characterized in that, during the described triggering signal that receives pre-candid photograph, by the video image before the triggering signal is carried out grabgraf, the image data of being captured in advance comprises:
, and the image data that obtains stored in real time to the described video image grabgraf of encoding by DSP;
When receiving the triggering signal of pre-candid photograph, from the image data of storage, obtain the picture that DSP has grasped the video image before the triggering signal, thus the image data of being captured in advance.
9. the pre-grasp shoot method of watch-dog Network Based as claimed in claim 7 is characterized in that, the video recording extracting data single frames video data that described DSP pre-records before the triggering signal grabgraf of decoding, and the image data of being captured in advance comprises:
When moment t received the triggering signal of pre-candid photograph, DSP was t-T single frames video recording data constantly from video recording extracting data time of the module stores of pre-recording, and the grabgraf of decoding;
Upgrade the value of N and t, make N=N-1, t=t-T;
Repeating described extraction time is t-T single frames video recording data constantly, and the grabgraf of decoding, and the value of upgrading N and t, makes N=N-1, t=t-T; Step, be 0 up to N;
Wherein, N is predefined pre-candid photograph number of times, and T is predefined blanking time.
10. the pre-grasp shoot method of watch-dog Network Based as claimed in claim 8 is characterized in that, described storage comprises:
Receive the described image data that DSP captures, image data is deposited in picture-storage position according to the numbering appointment of image data;
With the corresponding mark position of this image data is state one, and is state two with the mark position of a last image data correspondence;
Upgrade the numbering of described image data;
Continue to carry out above steps after waiting for predefined blanking time.
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| CN103414863A (en) * | 2013-08-07 | 2013-11-27 | 天脉聚源(北京)传媒科技有限公司 | Method and device for processing video |
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