CN111031288A - Real-time video acquisition system and method based on wireless transmission - Google Patents
Real-time video acquisition system and method based on wireless transmission Download PDFInfo
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- CN111031288A CN111031288A CN201911346118.9A CN201911346118A CN111031288A CN 111031288 A CN111031288 A CN 111031288A CN 201911346118 A CN201911346118 A CN 201911346118A CN 111031288 A CN111031288 A CN 111031288A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
- H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
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Abstract
The invention discloses a real-time video acquisition system and a method based on wireless transmission, wherein the system comprises a video acquisition end and a video recovery end, wherein the video acquisition end comprises a common high-speed ADC, a first signal processing unit and a wireless transmitting device; the common high-speed ADC takes a standard analog video signal input by the video acquisition device as a common analog signal, performs sampling and quantization processing, and sends a digital signal after quantization processing to the first signal processing unit; the first signal processing unit adopts an FPGA to transmit the data stream after framing the received digital signal to a video recovery end through a wireless transmitting device; the video recovery end comprises a wireless receiving device, a second signal processing unit and a common high-speed DAC; the wireless receiving device receives the data stream sent by the video acquisition end, sends the data stream to the second signal processing unit for de-framing processing, inputs the processed data stream to the common high-speed DAC to restore the digital signal into an analog signal, and outputs the analog signal to the display.
Description
Technical Field
The invention relates to the technical field of acquisition and recovery application of standard analog video signals, in particular to a real-time video acquisition system and method based on wireless transmission.
Background
The design idea of the current video acquisition and transmission equipment is as follows: the video signal processing method comprises the steps that an analog video signal is generated through camera collection, the analog video signal is converted into a digital signal through a special ADC (analog to digital converter), the digital signal is sent to an image processor, the image processor receives the digital video signal and then carries out framing, compression, encoding and other processing, the processed video signal is sent to an FPGA (field programmable gate array), and the FPGA forms the signal into a specific frame structure required by a wireless sending device and sends the specific frame structure to a receiving party through the wireless sending device. And the receiving party recovers the video signal through the reverse process of the process.
However, the existing video acquisition and transmission technology has the following defects: 1. the processing steps in the common video acquisition and wireless transmission process are complicated, and the time delay from acquisition to recovery of the analog video signal is large; 2. in a common video acquisition and wireless transmission product, in the process of digital video signal transmission, once a complex application environment (such as strong interference, multipath effect and the like in the process of long-distance wireless transmission) is met, a situation of synchronous signal receiving error can occur, and further, the situations of frame loss, picture blockage, mosaic and the like occur when an encoder recovers an analog video; if a frame signal error occurs, the whole picture cannot be decoded, even the picture is halted; 3. in order to realize common video acquisition and wireless transmission products, more hardware devices are needed, and the product cost is increased.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a real-time video acquisition system and a method based on wireless transmission, which solve the problems, wherein the system aims at acquisition and recovery application of standard analog video signals by means of a common high-speed ADC and a common high-speed DAC, and is suitable for a complex and long-distance wireless transmission system; the condition that the whole frame picture is lost or even crashes is avoided.
The invention is realized by the following technical scheme:
a real-time video acquisition system based on wireless transmission comprises a video acquisition end and a video recovery end, wherein the video acquisition end comprises a common high-speed ADC, a first signal processing unit and a wireless transmitting device;
the common high-speed ADC takes a standard analog video signal input by the video acquisition device as a common analog signal, performs sampling and quantization processing, and sends a digital signal (namely a quantized value) subjected to quantization processing to the first signal processing unit; the first signal processing unit receives the digital signals sent by the common high-speed ADC by adopting the FPGA, and sends the data stream formed by framing the received digital signals to a video recovery end through a wireless sending device;
the video recovery end comprises a wireless receiving device, a second signal processing unit and a common high-speed DAC;
the wireless receiving device receives the data stream sent by the video acquisition end through the wireless sending device and sends the data stream to the second signal processing unit; the second signal processing unit performs de-framing processing on the received data stream signal, and inputs the processed data stream signal to a common high-speed DAC; and the common high-speed DAC restores the received digital signals into analog signals and outputs the analog signals to a display to realize analog video playback.
Based on a video decoder (called as a video analog front end circuit or a video ADC) in the prior art, the video decoder consists of 1 or more analog-to-digital converters (ADC) and a series of functional modules such as a clamping circuit, a signal conditioning circuit, a synchronous processing circuit, a filter circuit and the like; the video recovery end encoder needs to synthesize the pixel signals, the synchronous signals and other control signals to recover correct and complete analog video signals. However, once a complex application environment (such as strong interference and multipath effect in a long-distance wireless transmission process) is encountered, a situation of a synchronization signal receiving error may occur, and further, situations such as frame loss, picture blockage, mosaic and the like occur when an encoder recovers an analog video; moreover, many processing flows are required in the recovery process, so that the system delay is increased, and the similar system delay is generally between 150ms and 200 ms; in addition, in a wireless transmission system, modulation and demodulation are required to realize transmission, and in order to reduce the occupied wireless transmission bandwidth, a digital video stream must be compressed and encoded, which also affects the quality of the recovered analog video.
Therefore, based on the defects of the existing video acquisition and transmission equipment, the standard analog video signal is considered to be a modulation signal, and can be directly superposed on the carrier signal during wireless transmission without modulation and demodulation, so that the ordinary ADC replaces the special ADC in the prior art, the ordinary DAC replaces the special DAC in the prior art, a series of complex processing procedures such as modulation, demodulation, coding and decoding are omitted, the system delay is reduced, and the quality of the recovered analog video is improved; in addition, the conventional ordinary ADC is mainly used in the industrial control field for quantizing analog signals (such as sound, speed, humidity, temperature, acceleration, gravity, pressure, and the like) generated by various sensors, or in the communication field, and the ordinary ADC is not applied to acquisition and recovery of standard analog video signals.
By adopting the technical scheme, the standard analog video signal input by the video acquisition device is taken as the common analog signal at the video acquisition end through the common high-speed ADC, sampling and quantization processing are carried out, and the digital signal (namely, a quantization value) after quantization processing is sent to the first signal processing unit FPGA, and the common high-speed ADC can be in butt joint with the FPGA; the method comprises the steps that a first signal processing unit FPGA receives digital signals (quantized digital signals of analog video signals) sent by a common high-speed ADC, the received digital signals form a specific frame format required by a radio frequency transmitter, the specific frame format is sent to a wireless sending device, and working parameters of the common high-speed ADC and the wireless sending device are configured; at the video recovery end, a common high-speed DAC is used for recovering the received digital signals into analog signals; when the ordinary high-speed ADC collects an analog video signal, the analog video signal is regarded as an ordinary analog signal, an output digital signal is a quantized value of the analog signal, and the video recovery end converts the quantized value (digital signal) into the analog signal by using the ordinary high-speed DAC, namely the analog video signal. Because each group of digital signals is a quantized value of a sampling point, even if a condition that a receiving error of a specific digital bit occurs in a complex application environment (such as strong interference, multipath effect and the like in a long-distance wireless transmission process), only one piece of sampling point information is influenced, so that the design of the invention can not cause the conditions of frame loss, picture blockage, mosaic and the like of an analog video; in addition, the processing flow is simplified in the process of acquiring and recovering, the system delay is greatly shortened, and real-time video acquisition and recovery can be realized basically; in addition, the standard analog video signal is a modulation signal, and can be directly superposed on a carrier signal during wireless transmission without modulation and demodulation.
The system directly collects and recovers standard analog video signals, and avoids the condition that the whole frame is lost or even crashes; the signal processing flow is reduced, and the time delay from acquisition to recovery of the analog video signal is reduced; the use of image processors is reduced, and the product cost and power consumption are reduced. The system is particularly suitable for collecting and recovering standard analog video signals in a complex and long-distance wireless transmission system.
Further, in order to realize the consistency between the recovered analog video signal and the source signal as much as possible, the ordinary high-speed ADC is a high-speed ADC having a sampling rate not lower than 108MHz and a resolution not lower than 12 bits, and the ordinary high-speed DAC is a high-speed DAC matched with the sampling rate and the resolution of the ordinary high-speed ADC.
Furthermore, the common high-speed ADC takes the standard analog video signal input by the video acquisition device as a common analog signal, performs sampling and quantization processing, and sends the digital signal after quantization processing to the first signal processing unit; the digital signals are processed in groups, and each group of digital signals corresponds to the quantized value of one sampling point.
Furthermore, the video acquisition end also comprises a power supply system, and the power supply system supplies power to all the devices of the video acquisition end; wherein, the power supply system adopts a battery.
Furthermore, the system aims at the acquisition and recovery application of standard analog video signals and is suitable for a complex and long-distance wireless transmission system.
On the other hand, the invention also provides a real-time video acquisition method based on wireless transmission, which comprises the following steps:
s1: directly sampling and quantizing standard analog video signals input by a video acquisition device through a common high-speed ADC (analog-to-digital converter) of a video acquisition end, and sending processed digital signals to a first signal processing unit;
s2: the first signal processing unit receives the digital signals sent by the common high-speed ADC by adopting the FPGA, and sends the data stream formed by framing the received digital signals to a wireless receiving device of a video recovery end through a wireless sending device;
s3: the wireless receiving device receives the data stream sent by the video acquisition end through the wireless sending device, sends the data stream to the second signal processing unit for de-framing processing, and inputs the processed data stream to the common high-speed DAC;
s4: and the common high-speed DAC restores the received digital signals into analog signals and outputs the analog signals to a display to realize analog video playback.
The working principle is as follows: the video acquisition end adopts a common high-speed ADC to directly acquire analog video signals, the video recovery end adopts a common high-speed DAC to directly recover the analog video signals, the compression coding, framing and unframing of a signal processing unit (comprising a first signal processing unit and a second signal processing unit), the complicated processing flow in a special ADC (namely a special video decoder chip) and the like are omitted, and the time delay between acquisition and recovery of the analog video signals is reduced; the method for directly acquiring the analog video signal by using the common high-speed ADC does not generate digital signals such as line synchronization, field synchronization, frame synchronization and the like of specific positions after the analog video signal is acquired by a conventional video decoder chip, so that the conditions of errors, losses and the like of the digital signals such as line synchronization, field synchronization, frame synchronization and the like in the transmission process of a conventional product are avoided, and the condition that the whole frame of picture is lost or even crashes when the video recovery end recovers the analog video signal is further avoided; the method for directly acquiring and recovering the analog video signal does not need the processes of compressing, encoding, decompressing, decoding and the like on the signal, the analog video signal acquired by the ordinary high-speed ADC is already a modulation signal, and can be transmitted in a wireless transmission system without other special modulation processes, so that the system complexity is reduced, the expenditure of hardware components is reduced, and the cost is reduced.
Furthermore, the ordinary high-speed ADC is a high-speed ADC with a sampling rate not lower than 108MHz and a resolution not lower than 12 bits, and the ordinary high-speed DAC is a high-speed DAC matched with the sampling rate and the resolution of the ordinary high-speed ADC.
Furthermore, the common high-speed ADC takes the standard analog video signal input by the video acquisition device as a common analog signal, performs sampling and quantization processing, and sends the digital signal after quantization processing to the first signal processing unit; the digital signals are processed in groups, and each group of digital signals corresponds to the quantized value of one sampling point.
Furthermore, the video acquisition end also comprises a power supply system, and the power supply system supplies power to all the devices of the video acquisition end; wherein, the power supply system adopts a battery.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention relates to a real-time video acquisition system and a method based on wireless transmission, which adopts standard analog video signals to directly acquire and recover, thereby avoiding the condition that the whole frame of picture is lost and even crashes;
2. the real-time video acquisition system and the method based on wireless transmission reduce the signal processing flow, improve the signal processing speed and reduce the delay between acquisition and recovery of analog video signals;
3. the invention relates to a real-time video acquisition system and a method based on wireless transmission.A Field Programmable Gate Array (FPGA) is adopted to compress, encode and frame acquired signals, so that the use of an image processor is reduced, and the product cost is reduced;
4. the invention relates to a real-time video acquisition system and a real-time video acquisition method based on wireless transmission, which are particularly suitable for acquisition and recovery of standard analog video signals in a complex and long-distance wireless transmission system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic diagram of a real-time video capture system based on wireless transmission according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
As shown in fig. 1, the real-time video acquisition system based on wireless transmission of the present invention includes a video acquisition end and a video recovery end, wherein the video acquisition end includes a common high-speed ADC, a first signal processing unit, and a wireless transmission device;
the common high-speed ADC takes a standard analog video signal input by the video acquisition device as a common analog signal, performs sampling and quantization processing, and sends a digital signal (namely a quantized value) subjected to quantization processing to the first signal processing unit; the first signal processing unit receives the digital signals sent by the common high-speed ADC by adopting the FPGA, and sends the data stream formed by framing the received digital signals to a video recovery end through a wireless sending device;
the video recovery end comprises a wireless receiving device, a second signal processing unit and a common high-speed DAC;
the wireless receiving device receives the data stream sent by the video acquisition end through the wireless sending device and sends the data stream to the second signal processing unit; the second signal processing unit performs de-framing processing on the received data stream signal, and inputs the processed data stream signal to a common high-speed DAC; and the common high-speed DAC restores the received digital signals into analog signals and outputs the analog signals to a display to realize analog video playback.
In this embodiment, in order to achieve the consistency between the recovered analog video signal and the source signal as much as possible, the common high-speed ADC is a high-speed ADC having a sampling rate not lower than 108MHz and a resolution not lower than 12 bits, and the common high-speed DAC is a high-speed DAC matched with the sampling rate and the resolution of the common high-speed ADC.
In this embodiment, the ordinary high-speed ADC samples and quantizes a standard analog video signal input by the video acquisition device as an ordinary analog signal, and sends a quantized digital signal to the first signal processing unit; the digital signals are processed in groups, and each group of digital signals corresponds to the quantized value of one sampling point.
In this embodiment, the video acquisition end further includes a power supply system, and the power supply system supplies power to each device of the video acquisition end; wherein, the power supply system adopts a battery.
The working principle is as follows: based on the defects of the existing video acquisition and transmission equipment, the standard analog video signal is a modulation signal, and can be directly superposed on a carrier signal without modulation and demodulation when wireless transmission is carried out, so that the ordinary ADC replaces the special ADC in the prior art, the ordinary DAC replaces the special DAC in the prior art, a series of complex processing flows such as modulation, demodulation, coding and decoding are omitted, the system delay is reduced, and the quality of the recovered analog video is improved; in addition, the conventional ordinary ADC is mainly used in the industrial control field for quantizing analog signals (such as sound, speed, humidity, temperature, acceleration, gravity, pressure, and the like) generated by various sensors, or in the communication field, and the ordinary ADC is not applied to acquisition and recovery of standard analog video signals.
The system analog video signal input by a video acquisition device is used as a common analog signal at a video acquisition end through a common high-speed ADC (analog to digital converter), sampling and quantization processing are carried out, and a digital signal (namely a quantization value) after quantization processing is sent to a first signal processing unit FPGA (field programmable gate array), wherein the common high-speed ADC can be in butt joint with the FPGA; receiving a digital signal (a quantized digital signal of an analog video signal) sent by a common high-speed ADC by a first signal processing unit FPGA; the received digital signals form a specific frame format required by the radio frequency transmitter and are sent to the wireless sending device, and working parameters of the common high-speed ADC and the wireless sending device are configured; at the video recovery end, a common high-speed DAC is used for recovering the received digital signals into analog signals; when the ordinary high-speed ADC collects an analog video signal, the analog video signal is regarded as an ordinary analog signal, an output digital signal is a quantized value of the analog signal, and the video recovery end converts the quantized value (digital signal) into the analog signal by using the ordinary high-speed DAC, namely the analog video signal. Because each group of digital signals is a quantized value of a sampling point, even if a condition that a receiving error of a specific digital bit occurs in a complex application environment (such as strong interference, multipath effect and the like in a long-distance wireless transmission process), only one piece of sampling point information is influenced, so that the design of the invention can not cause the conditions of frame loss, picture blockage, mosaic and the like of an analog video; in addition, the processing flow is simplified in the process of acquiring and recovering, the system delay is greatly shortened, and real-time video acquisition and recovery can be realized basically; in addition, the standard analog video signal is a modulation signal, and can be directly superposed on a carrier signal during wireless transmission without modulation and demodulation.
The system directly collects and recovers standard analog video signals, and avoids the condition that the whole frame is lost or even crashes; the signal processing flow is reduced, and the time delay from acquisition to recovery of the analog video signal is reduced; the use of image processors is reduced, and the product cost and power consumption are reduced. The system is particularly suitable for collecting and recovering standard analog video signals in a complex and long-distance wireless transmission system.
The specific implementation process of the video acquisition system is as follows:
s1: directly sampling and quantizing standard analog video signals input by a video acquisition device through a common high-speed ADC (analog-to-digital converter) of a video acquisition end, and sending processed digital signals to a first signal processing unit;
s2: the first signal processing unit receives the digital signals sent by the common high-speed ADC by adopting the FPGA, and sends the data stream formed by framing the received digital signals to a wireless receiving device of a video recovery end through a wireless sending device;
s3: the wireless receiving device receives the data stream sent by the video acquisition end through the wireless sending device, sends the data stream to the second signal processing unit for de-framing processing, and inputs the processed data stream to the common high-speed DAC;
s4: and the common high-speed DAC restores the received digital signals into analog signals and outputs the analog signals to a display to realize analog video playback.
When in implementation: the video acquisition end adopts a common high-speed ADC to directly acquire analog video signals, the video recovery end adopts a common high-speed DAC to directly recover the analog video signals, the compression coding, framing and unframing of a signal processing unit (comprising a first signal processing unit and a second signal processing unit), the complicated processing flow in a special ADC (namely a special video decoder chip) and the like are omitted, and the time delay between acquisition and recovery of the analog video signals is reduced; the method for directly acquiring the analog video signal by using the common high-speed ADC does not generate digital signals such as line synchronization, field synchronization, frame synchronization and the like of specific positions after the analog video signal is acquired by a conventional video decoder chip, so that the conditions of errors, losses and the like of the digital signals such as line synchronization, field synchronization, frame synchronization and the like in the transmission process of a conventional product are avoided, and the condition that the whole frame of picture is lost or even crashes when the video recovery end recovers the analog video signal is further avoided; the method for directly acquiring and recovering the analog video signal does not need the processes of compressing, encoding, decompressing, decoding and the like on the signal, the analog video signal acquired by the ordinary high-speed ADC is already a modulation signal, and can be transmitted in a wireless transmission system without other special modulation processes, so that the system complexity is reduced, the expenditure of hardware components is reduced, and the cost is reduced.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A real-time video acquisition system based on wireless transmission is characterized by comprising a video acquisition end and a video recovery end, wherein the video acquisition end comprises a common high-speed ADC, a first signal processing unit and a wireless transmitting device;
the common high-speed ADC takes a standard analog video signal input by the video acquisition device as a common analog signal, performs sampling and quantization processing, and sends a digital signal after quantization processing to the first signal processing unit; the first signal processing unit receives the digital signals sent by the common high-speed ADC by adopting the FPGA, and sends the data stream formed by framing the received digital signals to a video recovery end through a wireless sending device;
the video recovery end comprises a wireless receiving device, a second signal processing unit and a common high-speed DAC;
the wireless receiving device receives the data stream sent by the video acquisition end through the wireless sending device and sends the data stream to the second signal processing unit; the second signal processing unit performs de-framing processing on the received data stream signal, and inputs the processed data stream signal to a common high-speed DAC; and the common high-speed DAC restores the received digital signals into analog signals and outputs the analog signals to a display to realize analog video playback.
2. The system according to claim 1, wherein the normal high-speed ADC is a high-speed ADC with a sampling rate not lower than 108MHz and a resolution not lower than 12 bits, and the normal high-speed DAC is a high-speed DAC matched with the sampling rate and the resolution of the normal high-speed ADC.
3. The system according to claim 1, wherein the normal high-speed ADC samples and quantizes a normal analog video signal inputted from the video acquisition device as a normal analog signal, and sends a quantized digital signal to the first signal processing unit; the digital signals are processed in groups, and each group of digital signals corresponds to the quantized value of one sampling point.
4. The real-time video acquisition system based on wireless transmission as claimed in claim 1, wherein the video acquisition end further comprises a power supply system, the power supply system supplies power to each device of the video acquisition end; wherein, the power supply system adopts a battery.
5. The system of claim 1, wherein the system is adapted for complex, long-distance wireless transmission systems for acquisition and recovery of standard analog video signals.
6. A real-time video acquisition method based on wireless transmission is characterized by comprising the following steps:
s1: directly sampling and quantizing standard analog video signals input by a video acquisition device through a common high-speed ADC (analog-to-digital converter) of a video acquisition end, and sending processed digital signals to a first signal processing unit;
s2: the first signal processing unit receives the digital signals sent by the common high-speed ADC by adopting the FPGA, and sends the data stream formed by framing the received digital signals to a wireless receiving device of a video recovery end through a wireless sending device;
s3: the wireless receiving device receives the data stream sent by the video acquisition end through the wireless sending device, sends the data stream to the second signal processing unit for de-framing processing, and inputs the processed data stream to the common high-speed DAC;
s4: and the common high-speed DAC restores the received digital signals into analog signals and outputs the analog signals to a display to realize analog video playback.
7. The method according to claim 6, wherein the normal high-speed ADC is a high-speed ADC with a sampling rate not lower than 108MHz and a resolution not lower than 12 bits, and the normal high-speed DAC is a high-speed DAC matched with the sampling rate and the resolution of the normal high-speed ADC.
8. The real-time video acquisition method based on wireless transmission as claimed in claim 6, wherein the normal high-speed ADC takes a normal analog video signal input by the video acquisition device as a normal analog signal, performs sampling and quantization processing, and sends a digital signal after quantization processing to the first signal processing unit; the digital signals are processed in groups, and each group of digital signals corresponds to the quantized value of one sampling point.
9. The real-time video acquisition method based on wireless transmission as claimed in claim 6, wherein the video acquisition end further comprises a power system, the power system supplies power to each device of the video acquisition end; wherein, the power supply system adopts a battery.
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