CN107734329A - A kind of detecting system and detection method of baseband digital video frame per second - Google Patents
A kind of detecting system and detection method of baseband digital video frame per second Download PDFInfo
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- CN107734329A CN107734329A CN201711125442.9A CN201711125442A CN107734329A CN 107734329 A CN107734329 A CN 107734329A CN 201711125442 A CN201711125442 A CN 201711125442A CN 107734329 A CN107734329 A CN 107734329A
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- 238000001514 detection method Methods 0.000 title claims abstract description 65
- 238000013441 quality evaluation Methods 0.000 claims abstract description 16
- 238000003384 imaging method Methods 0.000 claims abstract description 5
- 238000009432 framing Methods 0.000 claims abstract description 4
- 238000004458 analytical method Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 9
- 238000005286 illumination Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 6
- 230000003993 interaction Effects 0.000 claims description 4
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- 239000000203 mixture Substances 0.000 claims description 2
- 238000007689 inspection Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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Abstract
The present invention relates to a kind of detecting system and detection method of baseband digital video frame per second.Detect and block including video frame rate, video quality evaluation analyzer and tested video camera；Described video frame rate detection card includes dial plate, the pointer at the uniform velocity rotated by motor driving is set on dial plate, every 5 degree have a long graduation mark on described dial plate, every 1 degree has a short graduation mark, the framing point of Automatic-searching dial plate and pointer position when described video frame rate detection card is also including detector bar and for image recognition, described detector bar are made up of the color of polylith difference gray scale；Described video frame rate detection card is a real graph card, produces continuous moving image, provides continuous video source for tested video camera, by the imaging of video camera, samples, coding, be transferred to video quality evaluation analyzer；The detection method of the present invention is detected using the detecting system of above-mentioned baseband digital video frame per second.
Description
Technical field
The present invention relates to video detection technology field, the detecting system of especially a kind of baseband digital video frame per second and detection
Method.
Background technology
Baseband digital video (including the unpressed video such as DVI, HDMI and SDI, the measurement of compressed video frame rate are not examined herein
Within survey method discusses) frame per second directly affects the quality of video, due to the special physiological structure of human eye, when video frame rate is low
When 16 frames/second, obvious interim card is just may feel that, when video frame rate is higher than 24 frames/second, human eye could be felt
To the smoothness of video.
Video frame rate is the important indicator for weighing a camera system, and common camera system video frame rate is generally 24
Frame/second, 25 frames/second, 30 frames/second, 50 frames/second etc..The video frame rate of high speed video system can reach 10000 frames/second, high frame per second
Camera system is adapted to shoot swiftly passing object.But these frame per second are all nominal theoretical frame per second, may occur in practice
Frame losing, again the problems such as frame, actual frame per second is caused to be less than nominal frame per second.
The factor for influenceing baseband digital video frame per second has the sampling rate for much mainly having headend equipment, video transmission line
Quality etc., the shortcomings that prior art：Current baseband digital video frame rate detection method relies primarily on video signal analysis instrument
Digital baseband signal is measured and (broadcasts path skill with reference to the television operating center broadcast control systems of professional standard GY/T165 2000 numeral
Art index and measuring method, the studio digital tv encoder Parameter specifications of GB/T14857 1993).Traditional measuring method is main
The parameters such as the wave-shape amplitude of signal, overshoot, rise time, frequency are measured.The equipment of costliness is needed to support and abundant
Professional equipment operating experience, it is unfavorable for very much the promotion and popularization of the measuring method.
The content of the invention
The invention aims to solve the problems, such as that prior art is present, there is provided a kind of inspection of baseband digital video frame per second
Examining system and detection method, solves the actual frame per second measurement problem of digital camera system, video whether ask by frame losing, weight frame etc.
Topic, can detect whether video frame rate reaches nominal requirement, the requirement to equipment and operating personnel is relatively low.
Therefore, the technical solution adopted by the present invention is：A kind of detecting system of baseband digital video frame per second, it is characterised in that
Detect and block including video frame rate, video quality evaluation analyzer and tested video camera；
Described video frame rate detection card includes dial plate, and the pointer at the uniform velocity rotated by motor driving is set on dial plate, described
Dial plate on every 5 degree have a long graduation mark, every 1 degree has a short graduation mark, and described video frame rate detection card also includes inspection
Survey bar and the framing point of Automatic-searching dial plate and pointer position during for image recognition, described detector bar are different by polylith
The color composition of gray scale；
Described video frame rate detection card is a real graph card, continuous moving image is produced, to be tested video camera
Continuous video source is provided, by the imaging of video camera, samples, coding, is transferred to video quality evaluation analyzer；
Described video quality evaluation analyzer includes video acquisition module, context detection module, data exchange module, regarded
Frequency analysis module and man-machine interface, described video acquisition module collection different video source；Described context detection module includes
Laser range sensor and light intensity detecting sensor, as video frequencies are detected with card and the detection of camera position distance and right
The detection of ambient light illumination；Data exchange module is responsible for the data interaction of video flowing；Analysis module is obtained from video flowing
Effective video frame, and calculate the actually active frame per second of video；Man-machine interface be responsible for operating personnel control instruction input and
Testing result exports.
Video quality evaluation analyzer is mainly by video acquisition module, the collection of base band video such as including AV, SDI, HDMI,
The video of main collection different type video camera, at the same also have all the way laser range sensor and light intensity detecting sensor as defeated
Enter, as to detection of the video frequencies detection card with the detection of camera position distance and to ambient light illumination, be for experiment condition
It is no to meet that testing requirements provide objective basis.Data exchange module is mainly responsible for the data interaction of video flowing, in favor of video point
Analysis module obtains effective video frame from video flowing.The control instruction input and detection of operating personnel is mainly responsible in man-machine interface
As a result export, can be interacted by keyboard and mouse.
Described detector bar is 4, is distributed in the direction up and down of dial plate, and each detector bar is by 4 pieces of different gray scales
Color forms.For detecting whether it is effective image.
Described anchor point position 4, it is distributed on four corners.Automatic-searching dial plate and pointer position during for image recognition
Put.
Described pointer is driven by constant speed direct current generator, pointer uniform rotation, and the time of turning around is about 1 second.
Described video frame rate detection card includes two dial plates in left and right, and left side dial plate turns around for one second, and the right dial plate is
Turn around within one minute.Double dial plate modes can calculate the pointer position of 2 dial plates with Video Detection Algorithm, most long to obtain 1 point
Unduplicated video pictures in clock, the identification to valid frame can be more accurate.
Described detection graph card is fixed in reflecting lamp box, and lamp box uses 5500K colour temperatures, the light source of 2000LUX illumination,
Best Detection results can be reached.
A kind of detection method of baseband digital video frame per second, it is characterised in that using the inspection of above-mentioned baseband digital video frame per second
Examining system is detected, and detection method is as follows：
(1) video record：Recorded a video from video frequency collection card by the function pair video for calling the SDK of capture card to provide
And compress and be saved in hard disk；
(2) video frame extraction：The each frame of video is extracted from the video recording of hard disk, preserves into JPG format pictures；
(3) picture pre-processes：Gray processing processing is carried out to JPG format-patterns, generates 256 color shade pictures；
(4) picture positions：The dial plate position of picture is positioned according to " ten " the word elements of a fix on gray scale picture；
(5) picture is verified：Verified according to 4 gray scale color lumps on gray scale picture, when detecting that gray value is by certain
Value and rule become increased, and 4 positions are all verified, representative is effective picture；
(6) pointer position change checking：By checking that the data variation in gray scale picture in gray scale value matrix is verified,
Data variation represents valid frame more than certain threshold values；
(7) valid frame calculates：Whole effective picture and valid frame are calculated, if the calculating one that 2 adjacent frames change
Frame valid frame, according to formula：The actually active frame per second of (whole valid frames)/video record duration=video.
(8) result exports：Testing result is exported by display interface, if same number of frames or abnormal frame, passes through interface
Window exports.
This practicality is mainly formed with by 2 kinds of detection instruments and a kind of equipment to be checked, and the picture of motion is produced by video detection card
Face, as the video source of tested video camera, by the imaging of video camera, sample, coding, be transferred to video quality evaluation analysis
Instrument, decoded by video quality evaluation analyzer and be reduced into raw video signal, and raw video signal is stored, to regarding
Frequently each frame carries out graphical analysis, judges to be effective video frame, so as to calculate the actually active frame per second of tested video camera.
The beneficial effects of the present invention are：
1. traditional technique in measuring digital baseband video frame rate uses digital video oscillograph, to baseband video signal
Waveform is analyzed, very high to the technical requirements of testing staff, and the result of display is all waveform, very not directly perceived, it is necessary to have rich
Rich experience can just be understood.This detection method is simple, intuitively, it is only necessary to vision signal access point video quality evaluation analyzer
In, start detection card, testing result can be exported automatically by clicking on detection.
2.GA/T 1128-2013《Safety precaution video monitoring high-definition camera measuring method》Middle video frame rate inspection
Graph card is detected in survey method and uses pendulum either second generator, pendulum is to move back and forth mode, and pendulum is possible to
Photograph identical picture (for example pendulum is in as the minimum point of left swing with the picture that the minimum point of right pendulum is taken is, but
It is all valid frame in fact to be).Second, generator used electronic stopclock, and electronic stopclock has refresh time, it is possible to can photograph number
The ghost image of word, it is valid frame to be difficult to differentiate.This detection method uses the pointer continuously run, solves the above
2 kinds of problems.
3. whether contrast some frame per second detection modes and differentiated using human eye is the frame that changes, this detection method uses image
Whether recognizer automatic detection is the frame changed, greatly reduces the working strength of inspector, improves accuracy.
4. there is the time for exposure centre of each frame of video camera, because the pointer of frame per second detection card is uniform rotation, exposing
Light time, interior pointer was also to have displacement, the effect shot be exactly pointer have it is fuzzy, but due to the time for exposure of each frame
It is identical, so the pointer fog-level of each frame is substantially similar, it can be set in the contrast threshold values plus algorithm, pointer obscures
Testing result is not interfered with.
Brief description of the drawings
Fig. 1 is hardware device connection diagram of the present invention.
Fig. 2 is video detection card structure figure of the present invention.
Fig. 3 is video quality evaluation analyzer structural topology figure
Fig. 4 is video quality evaluation analyzer video analysis algorithm pattern.
Embodiment
Below in conjunction with the accompanying drawings, the present invention will be described in detail.
As depicted in figs. 1 and 2, a kind of detecting system of baseband digital video frame per second, including video frame rate detection card 7, depending on
Frequency Quality Evaluation Analysis instrument 9 and tested video camera 8.
Video frame rate detection card includes dial plate 5, sets the pointer 4 for being driven by motor 6 and at the uniform velocity being rotated on dial plate, on dial plate often
5 degree have one long graduation mark 3, and every 1 degree has a short graduation mark, and video frame rate detection card also includes detector bar and known for image
The framing point 1 of Automatic-searching dial plate and pointer position when other, described detector bar 2 by polylith difference gray scale color group
Into；
Described video frame rate detection card is a real graph card, continuous moving image is produced, to be tested video camera
Continuous video source is provided, by the imaging of video camera, samples, coding, is transferred to video quality evaluation analyzer；
As shown in figure 3, described video quality evaluation analyzer includes video acquisition module, context detection module, data
Switching Module, analysis module and man-machine interface, described video acquisition module collection different video source；Described environment inspection
Surveying module includes laser range sensor and light intensity detecting sensor, as to video frequencies detection card and camera position distance
Detection and detection to ambient light illumination；Data exchange module is responsible for the data interaction of video flowing；Analysis module be from regarding
Frequency obtains effective video frame in flowing, and calculates the actually active frame per second of video；The control of operating personnel is responsible in man-machine interface
Instruction input and testing result output.
Detector bar is 4, is distributed in the direction up and down of dial plate, each detector bar by 4 pieces of different gray scales color group
Into.Anchor point position 4, it is distributed on four corners.Pointer is driven by constant speed direct current generator, pointer uniform rotation, when turning around
Between be about 1 second.Video frame rate detection card can also include two dial plates in left and right, and left side dial plate turns around for one second, the right
Dial plate is to turn around for one minute.Detection graph card is fixed in reflecting lamp box, and lamp box uses 5500K colour temperatures, 2000LUX illumination
Light source.
As shown in figure 4, a kind of detection method of baseband digital video frame per second of the present invention, using baseband digital video frame per second
Detecting system is detected, and detection method is as follows：
(1) video record：Recorded a video from video frequency collection card by the function pair video for calling the SDK of capture card to provide
And compress and be saved in hard disk；
(2) video frame extraction：The each frame of video is extracted from the video recording of hard disk, preserves into JPG format pictures；
(3) picture pre-processes：Gray processing processing is carried out to JPG format-patterns, generates 256 color shade pictures；
(4) picture positions：The dial plate position of picture is positioned according to " ten " the word elements of a fix on gray scale picture；
(5) picture is verified：Verified according to 4 gray scale color lumps on gray scale picture, when detecting that gray value is by certain
Value and rule become increased, and 4 positions are all verified, representative is effective picture；
(6) pointer position change checking：By checking that the data variation in gray scale picture in gray scale value matrix is verified,
Data variation represents valid frame more than certain threshold values；
(7) valid frame calculates：Whole effective picture and valid frame are calculated, if the calculating one that 2 adjacent frames change
Frame valid frame, according to formula：The actually active frame per second of (whole valid frames)/video record duration=video.
(8) result exports：Testing result is exported by display interface, if same number of frames or abnormal frame, passes through interface
Window exports.
Listed above is only the specific embodiment of the present invention, and the invention is not restricted to above embodiment, the shape in pond
The shape of shape and steel pipe can also have many deformations (such as oval, square).One of ordinary skill in the art can be from this hair
All deformations that bright disclosure is directly exported or associated, are considered as protection scope of the present invention.
Claims (7)
1. a kind of detecting system of baseband digital video frame per second, it is characterised in that detect and block including video frame rate, video quality is commented
Valency analyzer and tested video camera；
Described video frame rate detection card includes dial plate, and the pointer at the uniform velocity rotated by motor driving, described table are set on dial plate
Every 5 degree have a long graduation mark on disk, and every 1 degree has a short graduation mark, and described video frame rate detection card also includes detector bar
The framing point of Automatic-searching dial plate and pointer position during with for image recognition, described detector bar is by polylith difference gray scale
Color composition；
Described video frame rate detection card is a real graph card, produces continuous moving image, is provided for tested video camera
Continuous video source, by the imaging of video camera, sample, coding, be transferred to video quality evaluation analyzer；
Described video quality evaluation analyzer includes video acquisition module, context detection module, data exchange module, video point
Analyse module and man-machine interface, described video acquisition module collection different video source；Described context detection module includes laser
Distance measuring sensor and light intensity detecting sensor, as the detection to video frequencies detection card and camera position distance and to environment
The detection of illumination；Data exchange module is responsible for the data interaction of video flowing；Analysis module is obtained effectively from video flowing
Frame of video, and calculate the actually active frame per second of video；The control instruction input and detection of operating personnel is responsible in man-machine interface
As a result export.
A kind of 2. detecting system of baseband digital video frame per second according to claim 1, it is characterised in that described detection
Bar is 4, is distributed in the direction up and down of dial plate, and each detector bar is made up of the color of 4 pieces of different gray scales.
A kind of 3. detecting system of baseband digital video frame per second according to claim 2, it is characterised in that described positioning
Point position 4, is distributed on four corners.
A kind of 4. detecting system of baseband digital video frame per second according to claim 1 or 3, it is characterised in that described finger
Pin is driven by constant speed direct current generator, pointer uniform rotation, and the time of turning around is 1 second.
A kind of 5. detecting system of baseband digital video frame per second according to claim 1, it is characterised in that described video
Frame per second detection card includes two dial plates in left and right, and left side dial plate turns around for one second, and the right dial plate is to turn around for one minute.
A kind of 6. detecting system of baseband digital video frame per second according to claim 1, it is characterised in that described detection
Graph card is fixed in reflecting lamp box, and lamp box uses 5500K colour temperatures, the light source of 2000LUX illumination.
7. a kind of detection method of baseband digital video frame per second, it is characterised in that regarded using the base-band digital described in claim 1
The detecting system of frequency frame per second is detected, and detection method is as follows：
(1) video record：By calling the function pair video that the SDK of capture card is provided to be recorded a video and being pressed from video frequency collection card
Contracting is saved in hard disk；
(2) video frame extraction：The each frame of video is extracted from the video recording of hard disk, preserves into JPG format pictures；
(3) picture pre-processes：Gray processing processing is carried out to JPG format-patterns, generates 256 color shade pictures；
(4) picture positions：The dial plate position of picture is positioned according to " ten " the word elements of a fix on gray scale picture；
(5) picture is verified：Verified according to 4 gray scale color lumps on gray scale picture, when detect gray value be by certain value and
Rule becomes increased, and 4 positions are all verified, representative is effective picture；
(6) pointer position change checking：By checking that the data variation in gray scale picture in gray scale value matrix is verified, data
Change represents valid frame more than certain threshold values；
(7) valid frame calculates：Whole effective picture and valid frame are calculated, if the frame of calculating one that 2 adjacent frames change has
Frame is imitated, according to formula：The actually active frame per second of (whole valid frames)/video record duration=video.
(8) result exports：Testing result is exported by display interface, if same number of frames or abnormal frame, passes through interfaces windows
Output.
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| CN109506900A (en) * | 2018-11-05 | 2019-03-22 | 苏州工业职业技术学院 | A kind of imaging frame rate detection system and its detection method near infrared camera |
| CN109729343A (en) * | 2018-12-19 | 2019-05-07 | 精微视达医疗科技（武汉）有限公司 | A kind of frame rate detection method of imaging device |
| CN110493593A (en) * | 2019-07-30 | 2019-11-22 | 中国科学院西安光学精密机械研究所 | A kind of photographic device frame frequency test macro and its test method |
| CN112995650A (en) * | 2019-12-18 | 2021-06-18 | 天翼智慧家庭科技有限公司 | Method and device for detecting video continuity of camera |
| CN116743984A (en) * | 2023-04-24 | 2023-09-12 | 武汉新朗光电科技有限公司 | Infrared thermal imaging frame rate detection system and application method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109506900A (en) * | 2018-11-05 | 2019-03-22 | 苏州工业职业技术学院 | A kind of imaging frame rate detection system and its detection method near infrared camera |
| CN109506900B (en) * | 2018-11-05 | 2023-11-14 | 苏州工业职业技术学院 | Imaging frame rate detection system and detection method for near infrared camera |
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| CN110493593B (en) * | 2019-07-30 | 2020-09-29 | 中国科学院西安光学精密机械研究所 | Camera device frame frequency test system and test method thereof |
| CN112995650A (en) * | 2019-12-18 | 2021-06-18 | 天翼智慧家庭科技有限公司 | Method and device for detecting video continuity of camera |
| CN112995650B (en) * | 2019-12-18 | 2023-10-20 | 天翼数字生活科技有限公司 | Method and device for detecting video continuity of camera |
| CN116743984A (en) * | 2023-04-24 | 2023-09-12 | 武汉新朗光电科技有限公司 | Infrared thermal imaging frame rate detection system and application method thereof |
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Application publication date: 20180223 |