CN103957390A - Image collecting system adopting high-definition camera - Google Patents
Image collecting system adopting high-definition camera Download PDFInfo
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- CN103957390A CN103957390A CN201410219782.8A CN201410219782A CN103957390A CN 103957390 A CN103957390 A CN 103957390A CN 201410219782 A CN201410219782 A CN 201410219782A CN 103957390 A CN103957390 A CN 103957390A
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Abstract
The invention relates to an image collecting system adopting a high-definition camera. The image collecting system comprises a controller, the high-definition camera and an image data transmission card. The controller is connected with the high-definition camera through signals of a user bus interface and controls the working mode of the high-definition camera. The signals of the user bus interface comprise EXSYNC, PRIN and BIN. The high-definition camera is connected with an image collecting card through a data bus interface, and the image data transmission card controls the high-definition camera and captures image data through the signals of the data bus interface. The data bus interface comprises DATA 0-11, FVAL, LVAL and STROBE. The image collecting system has the technical advantages that the image data transmission card generates input signals needed by work of a camera and interprets output signals of the camera, so that the high-definition camera works in an electric control mode and accurately captures the image data output by the camera in real time.
Description
Technical field
The present invention relates to intelligent transportation field, particularly a kind of image capturing system that uses high definition camera.
Background technology
In recent years along with country and each place government strengthen the input to infrastructure construction, the highway of China and urban road construction have all obtained unprecedented development, and the trend of this fast development also will continue in the following several years, and the intelligent transport technology matching with it has also obtained the development of advancing by leaps and bounds.If we liken broad road to is " hardware " of computer, the various intelligent transportation systems that are erected at so on these roads are exactly " software " operating on computer hardware, for guarantee driving safety, improve the operational efficiency of road, strengthen supervision etc. and bringing into play more and more important effect.And along with the continuous extension expansion of transportation network, the continuous breakthrough of intelligent transport technology, upgrading video monitoring and recognition technology for this " software " function are the important component parts of intelligent transportation system, China begins one's study very early and applies this technology and carry out traffic monitoring and disobey barrier and capture, and it is large quantities of to apply the high-tech enterprise of this technology as main business to be born.In this field in early days owing to being subject to the restriction of price and hardware advances level, what video camera was mostly selected is normal video camera, and over nearly 5 years, due to the emergence of a large amount of domestic high-tech enterprises, user is more and more higher to the requirement of image definition, SD camera is substantially superseded, the substitute is high definition camera, some feature of these cameras is as auto iris, rear burnt adjustment, anti-light dizzy, automatic gain, Automatic white balance, sensitivity etc. are all very approaching with the demand of ITS application, and its resolution is low, interlacing scan, interface, programmable control function also strengthens greatly.These advantages make the advantages such as high definition camera is high to the discrimination of car plate, candid photograph clear picture, control is simple, system docking is easy.As far as we know, in the intelligent transportation system of East China, Coastal Areas of South China, what the overwhelming majority adopted at present is all cameras more than 2,000,000 pixel resolutions, and in the majority with digital camera.Realize and market bearing capacity from technology, China possesses the condition of promoting the use of high resolution camera in intelligent transportation system at present completely.
Interval speed measuring system is to set up monitoring capturing system by set up video camera at road stuck point, to current vehicle in road stuck point monitored area monitor in real time, capture, to obtain the information such as the general size of license number, color, physics and Characteristics of Drivers ' Behavior of Vehicle Speed, the magnitude of traffic flow, vehicle, then information exchange is crossed in the database that transmission network is transferred to public security traffic command centre and traffic control branch center and is carried out data storage, inquires about, compares peer processes.To concentrate management effectively, can provide technical support effectively for various illegal activities such as the effective strike of public security department exeeds the regulation speed, hit-and-run, suspect vehicle.These information also can be for the automatic analysis to the magnitude of traffic flow, statistics with for to legal basis illegal, that vehicle is processed in violation of rules and regulations.
Present high definition camera is to capture the aspects such as image definition, simple to operate, car plate identification, the output of dual code stream video quite ripe, and still in the secondary development of high definition camera intelligent use algorithm, or progress is slow, and effect is not high.Some has increased high definition camera operation and the complexity thereof of intelligent use, and produces and conflict with camera basic function, causes camera job insecurity.
Present interval speed measuring function implementation method, is mainly to rely on front-end camera to capture car vehicle pictures, and the interval main frame that tests the speed is compared to many cars vehicle pictures, obtains a result.This mode is had relatively high expectations to network environment, and the in the situation that of unstable networks or interruption, stability is lower; And except front end high definition video camera also need to be for an interval of each stuck point configuration main frame that tests the speed, cost costliness.
Summary of the invention
For overcoming above-mentioned the deficiencies in the prior art, the present invention is based on interval velocity measuring technique, a kind of image capturing system that uses high definition camera has been proposed, capture the basic function maturations such as image definition, simple to operate, car plate identification, the output of dual code stream video, can in intelligent use, realize again interval speed measuring function.
The technical scheme that the present invention proposes is as follows:
A kind of image capturing system that uses high definition camera, comprise controller, high definition camera and image data transmission card, it is characterized in that, described controller is connected with high definition camera by subscriber bus interface signal, control the mode of operation of described high definition camera, described subscriber bus interface signal comprises EXSYNC, PRIN and BIN, wherein:
EXSYNC is trigger frame read output signal, and in the time that EXSYNC fixedly connects low level, camera is with greatest frame rate output image data; Positive and negative alternately time as EXSYNC, its trailing edge trigger frame is read;
PRIN is pixel reset signal, the pixel that resets between twice EXSYNC is effective, thus shorten effective exposure time; PRIN is low effectively, rise thereon along starting effectively exposure, if PRIN fixedly connects high level, the time of integration maximum; Connect low level if PRIN is fixed, high definition camera is collected less than any image information;
BIN is pixel combined signal, merges for controlling pixel, and BIN signal is effectively high;
Described high definition camera is connected with described figure capture card by data bus interface, described image data transmission Cali realizes control to described high definition camera and the grasping manipulation of view data with described data bus interface signal, described data bus interface comprises DATA 0 ~ 11, FVAL, LVAL and STROBE, wherein:
DATA 0 ~ 11 is totally 12 bit data bus, 12 bit image data of DATA 0 ~ 11 respectively corresponding certain pixel gray scale;
FVAL is frame synchronizing signal, and FVAL high level shows camera positive output one frame valid data;
LVAL is line synchronizing signal, in the time that being high level, FVAL shows that effective pixel of described high definition camera positive output is capable, between two effective going, LVAL can skip several invalid pixels by step-down, and the pixel number of skipping depends on model and the pre-triggering setting of described high definition camera;
STROBE is the pixel clock of view data, and its frequency is identical with data rate, even if data are invalid, STROBE is continuous alternation still, in order to obtain effective view data, described image data transmission card should, in the time that FVAL and LVAL are high level, carry out data latch at the trailing edge of STROBE;
Wherein, when PRIN is by low level during to high level saltus step, camera starts exposure, reach after the time for exposure of setting, EXSYNC signal step-down, trigger frame is read, and now first described high definition camera carries out frame transfer, frame transfer one finishes, output signal FVAL represents that by low uprising active data frame starts, and LVAL represents that by low uprising the effective pixel of camera positive output is capable, when FVAL and LVAL are again when step-down, represent a frame data end of output, can start trigger frame for the second time and read; Exposure for the second time can be carried out during this period of time after frame transfer for the first time finishes with before frame is read startup for the second time, and the time for exposure is adjustable within the specific limits.
Technique effect of the present invention is that described image data transmission card produces the required input signal of camera work, and the output signal of decipher camera works high definition camera and in real time, correctly captures the view data that camera is exported under automatically controlled mode.
Brief description of the drawings
Fig. 1 is the structure chart of the image capturing system of use high definition camera of the present invention;
Fig. 2 is the structure chart of the image data transmission card of the image capturing system of the use high definition camera shown in Fig. 1.
Embodiment
The image capturing system of use high definition camera as shown in Figure 1, comprise controller, high definition camera and image data transmission card, described controller is connected with high definition camera by subscriber bus interface signal, control the mode of operation of described high definition camera, described subscriber bus interface signal comprises EXSYNC, PRIN and BIN, wherein:
EXSYNC is trigger frame read output signal, and in the time that EXSYNC fixedly connects low level, camera is with greatest frame rate output image data; Positive and negative alternately time as EXSYNC, its trailing edge trigger frame is read;
PRIN is pixel reset signal, the pixel that resets between twice EXSYNC is effective, thus shorten effective exposure time; PRIN is low effectively, rise thereon along starting effectively exposure, if PRIN fixedly connects high level, the time of integration maximum; Connect low level if PRIN is fixed, high definition camera is collected less than any image information;
BIN is pixel combined signal, merges for controlling pixel, and BIN signal is effectively high;
Described high definition camera is connected with described figure capture card by data bus interface, described image data transmission Cali realizes control to described high definition camera and the grasping manipulation of view data with described data bus interface signal, described data bus interface comprises DATA 0 ~ 11, FVAL, LVAL and STROBE, wherein:
DATA 0 ~ 11 is totally 12 bit data bus, 12 bit image data of DATA 0 ~ 11 respectively corresponding certain pixel gray scale;
FVAL is frame synchronizing signal, and FVAL high level shows camera positive output one frame valid data;
LVAL is line synchronizing signal, in the time that being high level, FVAL shows that effective pixel of described high definition camera positive output is capable, between two effective going, LVAL can skip several invalid pixels by step-down, and the pixel number of skipping depends on model and the pre-triggering setting of described high definition camera;
STROBE is the pixel clock of view data, and its frequency is identical with data rate, even if data are invalid, STROBE is continuous alternation still, in order to obtain effective view data, described image data transmission card should, in the time that FVAL and LVAL are high level, carry out data latch at the trailing edge of STROBE;
Wherein, when PRIN is by low level during to high level saltus step, camera starts exposure, reach after the time for exposure of setting, EXSYNC signal step-down, trigger frame is read, and now first described high definition camera carries out frame transfer, frame transfer one finishes, output signal FVAL represents that by low uprising active data frame starts, and LVAL represents that by low uprising the effective pixel of camera positive output is capable, when FVAL and LVAL are again when step-down, represent a frame data end of output, can start trigger frame for the second time and read; Exposure for the second time can be carried out during this period of time after frame transfer for the first time finishes with before frame is read startup for the second time, and the time for exposure is adjustable within the specific limits.
As described in Figure 2, described image data transmission card comprises charge coupled cell (CCD) transducer, CCD drive circuit, CCD output protection circuit, CCD bias circuit, ccd signal pre-process circuit and FPGA; Wherein, described ccd sensor receives the imaging of described high definition camera; CCD bias circuit provides essential bias voltage for ccd sensor; the time sequential pulse that programmable logic device FPGA produces is controlled collection through CCD drive circuit to CCD; CCD output protection circuit can carry out protection effectively to CCD, and ccd signal pre-process circuit is made an uproar after analog signal is processed and offered FPGA the band of CCD output.
Described ccd sensor is made up of photosensitive area and memory block, and photosensitive area and memory block are all made up of 1072H × 1030V pixel; In photosensitive area, each pixel cell can be regarded as in vertical direction interconnective four the mos capacitance devices that covered by four phase gate clock A1, A2, A3, A4 and jointly forms, and they are as photosensitive area frame transfer control clock; 6 the black row (Black Lines) that distributing respectively on 1024 valid pixels are capable, black row is exactly the pixel column that does not participate in light integration of crested in fact; In the horizontal direction, valid pixel (Active Pixels) in 1072 pixels of every row is 1024, both sides distributing 2 × 20 black pixels (Black Pixels) and 2 × 4 transition pixel (Overscan Pixels), black pixel is the same with black row is also the pixel cell of crested, light integration is not participated in these unit, there is no optical charge packet generation, its Main Function is to play with reference to black level effect when the outputting video signal of CCD is carried out to preliminary treatment.The effect of transition pixel unit is mainly to play a transition role between valid pixel unit and black pixel cell; In memory block, each pixel cell can be regarded as in vertical direction interconnective four the mos capacitance devices that covered by four phase gate clock B1, B2, B3, B4 and jointly forms, and they are as memory block row transfering clock.Dual serial Output Shift Register (Output Register) is distributing in the horizontal direction of memory block, the inner not photosensitive unit of register, only be used for the buanch unit covering of transference sensitization charge packet, each unit is equivalent to be covered by three phase clock C1, C2, C3, and these unit are all connected corresponding mutually with the pixel cell of memory block.Its Main Function is that output amplifier is connected on horizontal output shift register.
The work schedule of described ccd image sensor can be divided into frame transfer sequential (Frame timing), and row shifts sequential (Line timing) and pixel readout sequence (Pixel timing).Frame transfer sequential refers to that CCD shifts a two field picture sequential of output, row shifts sequential and refers to that one-row pixels completes the sequential shifting from memory block to horizontal shifting register under the driving of clock, and pixel readout sequence refers in the one-row pixels sequential that level is read by turn from horizontal shifting register under C clock drives.The course of work of described ccd image sensor can be divided into two stages: photo stage and transition phase.At photo stage, imageing sensor photosensitive array carries out charge accumulated, and memory block carries out exporting to the electric charge of output amplifier to the electric charge transfer of horizontal shifting register and horizontal shifting register; In transition phase, imageing sensor mainly completes the transfer to memory block by photosensitive array of accumulated electric charge.
At photo stage, photosensitive array produces electric charge under the irradiation of external light source, and this stage frame transfer control signal A1, A2, A3, A4 do not change, and between photosensitive area and memory block, is blocking-up state, and electric charge does not shift; And exported in row transfering state and by electric charge in this stage memory block, the process that row shifts is divided into active line and two stages of line retrace.In the line retrace stage, SSC is high level, in memory block, the electric charge of each pixel cell is expert under the control of transfer signal B1, B2, B3, B4 to horizontal shifting register direction line down, and pixel transfer signal C1, C2, C3 do not change, and imageing sensor is exported without pixel electric charge.
In the active line stage, SSC is low level, and row transfer signal B1, B2, B3, B4 do not change, and the pixel electric charge in horizontal shifting register is successively exported through output amplifier under the control of pixel transfer signal C1, C2, C3, after every output a line signal, once go transfer.
In transition phase, frame transfer control signal A1, A2, A3, A4 and row transfer control signal B1, B2, B3, B4 act on simultaneously, overlapping variation, the electric charge of photosensitive area accumulation is transferred to memory block line by line, and in the time of this section, ask that interior pixel transfer signal C1, C2, C3 are inoperative, outside output charge.Complete after whole transition phase, once more enter photo stage, so move in circles to ensure the work of imageing sensor.
Finally it should be noted that above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although the present invention is had been described in detail with reference to preferred embodiment; those of ordinary skill in the field are to be understood that; still can modify or part technical characterictic is equal to and replaces and do not depart from the spirit of technical solution of the present invention the specific embodiment of the present invention, it all should be contained in the middle of the technical scheme scope of request protection of the present invention.
Claims (3)
1. one kind uses the image capturing system of high definition camera, comprise controller, high definition camera and image data transmission card, described controller is connected with high definition camera by subscriber bus interface signal, control the mode of operation of described high definition camera, described subscriber bus interface signal comprises EXSYNC, PRIN and BIN, wherein:
EXSYNC is trigger frame read output signal, and in the time that EXSYNC fixedly connects low level, camera is with greatest frame rate output image data; Positive and negative alternately time as EXSYNC, its trailing edge trigger frame is read;
PRIN is pixel reset signal, the pixel that resets between twice EXSYNC is effective, thus shorten effective exposure time; PRIN is low effectively, rise thereon along starting effectively exposure, if PRIN fixedly connects high level, the time of integration maximum; Connect low level if PRIN is fixed, high definition camera is collected less than any image information;
BIN is pixel combined signal, merges for controlling pixel, and BIN signal is effectively high;
Described high definition camera is connected with described figure capture card by data bus interface, described image data transmission Cali realizes control to described high definition camera and the grasping manipulation of view data with described data bus interface signal, described data bus interface comprises DATA 0 ~ 11, FVAL, LVAL and STROBE, wherein:
DATA 0 ~ 11 is totally 12 bit data bus, 12 bit image data of DATA 0 ~ 11 respectively corresponding certain pixel gray scale;
FVAL is frame synchronizing signal, and FVAL high level shows camera positive output one frame valid data;
LVAL is line synchronizing signal, in the time that being high level, FVAL shows that effective pixel of described high definition camera positive output is capable, between two effective going, LVAL can skip several invalid pixels by step-down, and the pixel number of skipping depends on model and the pre-triggering setting of described high definition camera;
STROBE is the pixel clock of view data, and its frequency is identical with data rate, even if data are invalid, STROBE is continuous alternation still, in order to obtain effective view data, described image data transmission card should, in the time that FVAL and LVAL are high level, carry out data latch at the trailing edge of STROBE;
Wherein, when PRIN is by low level during to high level saltus step, camera starts exposure, reach after the time for exposure of setting, EXSYNC signal step-down, trigger frame is read, and now first described high definition camera carries out frame transfer, frame transfer one finishes, output signal FVAL represents that by low uprising active data frame starts, and LVAL represents that by low uprising the effective pixel of camera positive output is capable, when FVAL and LVAL are again when step-down, represent a frame data end of output, can start trigger frame for the second time and read; Exposure for the second time can be carried out during this period of time after frame transfer for the first time finishes with before frame is read startup for the second time, and the time for exposure is adjustable within the specific limits.
2. the image capturing system of use high definition camera as claimed in claim 1, it is characterized in that, described image data transmission card comprises charge coupled cell (CCD) transducer, CCD drive circuit, CCD output protection circuit, CCD bias circuit, ccd signal pre-process circuit and FPGA; Wherein, described ccd sensor receives the imaging of described high definition camera; CCD bias circuit provides essential bias voltage for ccd sensor; the time sequential pulse that programmable logic device FPGA produces is controlled collection through CCD drive circuit to CCD; CCD output protection circuit can carry out protection effectively to CCD, and ccd signal pre-process circuit is made an uproar after analog signal is processed and offered FPGA the band of CCD output.
3. the image capturing system of use high definition camera as claimed in claim 1 or 2, is characterized in that, described ccd sensor is made up of photosensitive area and memory block.
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| CN1901708A (en) * | 2006-06-26 | 2007-01-24 | 华为技术有限公司 | Device, method and chip and cell phone for realizing image data collection |
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