CN110430382A - Video recording apparatus with SD video depth detection function - Google Patents
Video recording apparatus with SD video depth detection function Download PDFInfo
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- CN110430382A CN110430382A CN201910783819.2A CN201910783819A CN110430382A CN 110430382 A CN110430382 A CN 110430382A CN 201910783819 A CN201910783819 A CN 201910783819A CN 110430382 A CN110430382 A CN 110430382A
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- video
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
The invention discloses a kind of video recording apparatus with SD video depth detection function, include SD video decoding chip and fpga chip, SD video decoding chip is used to the SD Video Quality Metric of the different-format of input at the digital video of unified data format and being sent to fpga chip, while register is written in field synchronization lock state, color carrier frequency lock state and field frequency state；Fpga chip reads field synchronization lock state, color carrier frequency lock state and field frequency state from the register of SD video decoding chip if having, judges to the unprocessed form of digital video for first having detected whether effective digital video input.Video recording apparatus proposed by the present invention can carry out depth detection to the SD video for being input to aeronautical record loader, and the type of accurate judgement SD video improves the testability and maintainability of aeronautical record loader.
Description
Technical field
The invention belongs to electronic engineering field, it is related to a kind of videograph with SD video depth detection function and sets
It is standby.
Background technique
Video recording apparatus is a kind of professional equipment for being widely used in each field, automobile data recorder to driving video into
Row record, city day eye monitoring system record city daily operation, and aeronautical record loader is for flying aircraft
Row situation is recorded ..., and videograph has been deep into the every aspect of mankind's activity, is mentioned for routine work, the life of people
For necessary service and guarantee.
As shown in Figure 1, being broadly divided into video acquisition unit, video compressing unit, scheduling list inside video recording apparatus
Totally 4 parts, video acquisition unit are digitally converted after acquiring original video for member, storage unit, video compressing unit pair
Digital video generates encoding code stream data after carrying out coding compression, and storage unit receives encoded video data and is stored in non-volatile memory
In medium, dispatch control unit carries out integrated management control to other each functional units.It is good in order to have video recording apparatus
Good testability and maintainability, improves video recording apparatus error detection, mistake proofing, ability anti-interference, easy to maintain, video recording apparatus
All has certain built-in testing (BIT) ability, common BIT includes:
1) log inventory is generated, the important information of video recording apparatus operation is recorded in log inventory and stores to non-volatile
In storage medium；
2) input video detects, and judges the input video characteristic information that has that it's too late；
3) Video coding frame per second detects；
4) video recording apparatus heartbeat inspecting；
5) link state monitoring is stored.
SD video is one kind of video format, and resolution ratio is less than 1280x720, is generally divided into pal mode, NTSC system formula
With three kinds of SECAM system formula, pal mode video resolution be 720 × 576@25Hz, NTSC system formula video resolution be 720 ×
480@30Hz, SECAM system formula video resolution be 720 × 576@25Hz, SD video as traditional video format, although
Be eliminated use in many consumer electronics products, but still is widely used in industrial equipment field, in avionic device
Helmet Mounted Display, factor display, aeronautical record loader etc..It is illustrated in figure 2 SD video in aeronautical record loader
Detection principle diagram, the video and AD of its reception PAL/NTSC/SECAM standard of SD video decoding chip are converted into ITU-R
The 8bit YCbCr digital video signal of BT.656 standard, FPGA carry out compressed encoding operation, CPU core to digital video signal again
Piece carries out control to SD video decoding chip by I2C bus and state obtains, and is carried out by PCIE bus to fpga chip
Control and data acquisition have the input common means of SD video:
1) FPGA detects digital video by logic；
2) value that software obtains SD video decoding chip internal register is detected.
Using above two means be generally possible to obtain input SD video basic condition to get to input video whether there is or not
Two states, but cannot the format to input video further judged, obtain less than input video characteristic information, cause
It is difficult to analyse in depth problem when breaking down, promptly and accurately positioning failure reason, so that the testability of aeronautical record loader
It has a greatly reduced quality with maintainability, therefore, is badly in need of the method that a kind of pair of SD video carries out depth detection.
Summary of the invention
For the deficiency using traditional detection SD video, goal of the invention of the invention is to provide a kind of with SD view
The video recording apparatus of frequency depth detection function can carry out depth detection to SD video in aeronautical record loader.
Goal of the invention of the invention is achieved through the following technical solutions:
A kind of video recording apparatus with SD video depth detection function includes SD video decoding chip and FPGA
Chip, the SD Video Quality Metric of different-format that SD video decoding chip is used to input at unified data format number
Video is simultaneously sent to fpga chip, while field synchronization lock state, color carrier frequency lock state and field frequency state being written
Register；
Fpga chip is for first having detected whether effective digital video input, from SD video decoding chip if having
Field synchronization lock state, color carrier frequency lock state and field frequency state are read in register, to the original lattice of digital video
Formula judges.
According to features described above, fpga chip is equipped with ZVPMode bit if FPGA does not receive digital video, or receives number
Word video but frame synchronizing signal interval are greater than preset value, or receive digital video but to detect that video resolution is less than default
Value, then by ZVPState position is 0, indicates to input without effective digital video.
According to features described above, if genlocing state is field synchronization locking, color carrier frequency lock state is that color carries
Wave frequency rate locking and field frequency state are 50Hz, then determine input video for pal video；
If genlocing state is field synchronization locking, color carrier frequency lock state is that color carrier frequency does not lock
It is 50Hz with field frequency state, then determines input video for SECAM system video；
If genlocing state is field synchronization locking, color carrier frequency lock state is that color carrier frequency does not lock
With field frequency state 60Hz, then determine input video for NTSC system video.
The beneficial effects of the present invention are:
1) using video recording apparatus proposed by the present invention can be input to the SD video of aeronautical record loader into
Row depth detection, the type of accurate judgement SD video improve the testability and maintainability of aeronautical record loader.
2) video recording apparatus proposed by the present invention is suitable for the detection of all standard SD videos, testing principle and inspection
Flow gauge can be applied to any occasion using SD Video Applications, and marketing is strong.
3) video recording apparatus principle design proposed by the present invention is simple, testing process is clear, is easy to by related fields
Engineer receives, and engineer application is strong.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of video recording apparatus.
Fig. 2 is the schematic diagram of conventional on-board SD video detection.
Fig. 3 is the flow chart of the detection of SD video depth shown in embodiment.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
It is shown in Figure 2, a kind of video recording apparatus with SD video depth detection function shown in the present embodiment,
Comprising SD video decoding chip and fpga chip, as an example, SD video decoding chip selects vibration core science and technology development
7150 chips.
The detection of SD video depth mainly passes through the quantity of state Z of FPGAVPWith 7150 register value Z0x88To judge to input
The characteristic of video, quantity of state ZVPFor single bit number, value 0 or 1, the digital video that 0 expression FPGA is received is invalid, and 1 indicates FPGA
The digital video received is effective；Register value Z0x88For the numerical value that 7150 chip interior addresses are in 0x88 register, determine
It is adopted as shown in table 1.
The definition of 1 GM7150 chip interior 0x88 status register of table
According to airborne SD video depth detection principle diagram shown in Fig. 3, airborne SD video depth detection process is as follows:
One, FPGA has detected whether effective digital video input
The case where according to input video, 7150 have following features:
1. entering Freerun modes when no video input and when powering on for the first time, 7150 and exporting the pal format of default
The blank screen signal of the 8bit YCbCr of the ITU-R BT.656 standard of (720*576@25Hz)；
2. can be from the variation of motion adaptive video source standard according to the variation of input video, 7150；
3. when video source from have to it is no when, 7150 enter Freerun modes and systems that the video before it can be kept to export
Formula state；
4. when video source from scratch when, 7150 can adapt to new video input, video output also adaptive input video
Format.
Because no matter in the case where inputting whether there is or not analog video, 7150 can export the 8bit of ITU-R BT.656 standard
YCbCr digital video signal, so FPGA also needs further to detect the digital video of input, if detecting video
Frame synchronizing signal interval is greater than 128ms or detects that video resolution is less than preset value, then by state quantity signal ZVPIt is set to 0.If
It is exported when 7150 lower electricity or failure without vision signal, then also by state quantity signal ZVPIt is set to 0.
Two, when there is effective digital video input FPGA, then field is read from the register of SD video decoding chip
Genlocing state, color carrier frequency lock state and field frequency state, judge the unprocessed form of digital video.
A) pal mode video input
The 7150 automatic pal videos that adapt to input and export the ITU-R BT.656 of pal format (720*576@25Hz)
The signal of the 8bit YCbCr of standard, the digital video that fpga logic judgement receives is effective, just by state quantity signal ZVP1 is set,
As shown in table 2, bit2=1, bit3=1, bit5=1 of the 0x88 address register of 7150 chips.
B) SECAM system formula video input
The 7150 automatic ITU-R for adapting to SECAM system video input and exporting SECAM system format (720*576@25Hz)
The signal of the 8bit YCbCr of BT.656 standard, the digital video that fpga logic judgement receives is effective, just by state quantity signal
ZVP1 is set, as shown in table 2, bit2=1, bit3=0, bit5=1 of the 0x88 address register of 7150 chips.
C) NTSC system formula video input
The 7150 automatic ITU-R for adapting to NTSC system video input and exporting NTSC system format (720*480@30Hz)
The signal of the 8bit YCbCr of BT.656 standard, the digital video that fpga logic judgement receives is effective, just by state quantity signal
ZVP1 is set, as shown in table 2, bit2=1, bit3=0, bit5=0 of the 0x88 address register of 7150 chips.
GM7150 chip interior 0x88 status register numerical value when 2 different video of table inputs
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement all should belong to the guarantor of appended claims of the invention
Protect range.
Claims (3)
1. a kind of video recording apparatus with SD video depth detection function includes SD video decoding chip and FPGA core
Piece, it is characterised in that: the SD Video Quality Metric for the different-format that SD video decoding chip is used to input is at unified data
The digital video of format is simultaneously sent to fpga chip, while by field synchronization lock state, color carrier frequency lock state and field
Register is written in frequency state；
Fpga chip is for first having detected whether effective digital video input, from the deposit of SD video decoding chip if having
Field synchronization lock state, color carrier frequency lock state and field frequency state are read in device, and the unprocessed form of digital video is made
Judge out.
2. a kind of video recording apparatus with SD video depth detection function according to claim 1, feature exist
Z is equipped in fpga chipVPMode bit if FPGA does not receive digital video, or receives digital video but frame synchronizing signal
Interval is greater than preset value, or receives digital video but detect that video resolution is less than preset value, then by ZVPState position
It is 0, indicates to input without effective digital video.
3. a kind of video recording apparatus with SD video depth detection function according to claim 1, feature exist
In if genlocing state is field synchronization locking, color carrier frequency lock state is color carrier frequency locking and field frequency state
For 50Hz, then determine input video for pal video；
If genlocing state is field synchronization locking, color carrier frequency lock state is that color carrier frequency does not lock and field
Frequency state is 50Hz, then determines input video for SECAM system video；
If genlocing state is field synchronization locking, color carrier frequency lock state is that color carrier frequency does not lock and field
Frequency state 60Hz then determines input video for NTSC system video.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910783819.2A CN110430382B (en) | 2019-08-23 | 2019-08-23 | Video recording equipment with standard definition video depth detection function |
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|---|---|---|---|
| CN201910783819.2A CN110430382B (en) | 2019-08-23 | 2019-08-23 | Video recording equipment with standard definition video depth detection function |
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| CN110430382A true CN110430382A (en) | 2019-11-08 |
| CN110430382B CN110430382B (en) | 2021-10-26 |
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