CN105828082B - Video image Fast Compression system and method - Google Patents
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Abstract
The present invention provides a kind of video image Fast Compression system and methods, comprising: signal conversion unit, control unit, coding unit, storage unit and host computer；Wherein, original image signal is converted to single-ended picture signal and is sent to control unit by signal conversion unit；Single-ended picture signal is converted to RAW format signal and is sent to coding unit by control unit；Coding unit carries out coding generation compressing image signal to RAW format signal and is sent to control unit；Control unit receives compressing image signal and is written into storage unit；Host computer accesses storage unit and obtains compressing image signal.The present invention can be realized the real-time acquisition of big resolution video image, using inside image correlation and statistical property to video image carry out high speed, high compression ratio, high-resolution compression, and can will compress image quickly be transferred to host computer and external network.
Description
Technical Field
The invention relates to the field of image processing, in particular to a system and a method for rapidly compressing video images.
Background
With the development of science and technology, people pay more and more attention to public safety, and security video monitoring systems are increasingly applied. The security video monitoring system goes through two stages of analog monitoring and digital monitoring, and a new generation of monitoring technology is rapidly developed in the direction of large-scale network monitoring and intelligent monitoring on the basis of digital monitoring, so that the security video monitoring system provides more and more challenges in the aspects of reliability, high resolution, intelligent video processing, ten-thousand-group camera management, multiple video source signal input, network storage and the like. The resolution and frame frequency of images processed by the existing security video monitoring system are higher and higher, the information amount is quite huge, and if the images are not compressed, hundreds of megabytes or even gigabytes of bandwidth are needed, great inconvenience is brought to data storage, processing and transmission.
Therefore, a high-speed acquisition, compression and transmission method for large-resolution video images by using an embedded technology is needed to solve the above problems.
Disclosure of Invention
The invention provides a video image rapid compression system and a video image rapid compression method, which can realize the real-time acquisition of a large-resolution video image, carry out high-speed, high-compression-ratio and high-resolution data compression on the video image by utilizing the internal correlation and statistical characteristics of the image, and rapidly transmit the compressed image to an upper computer and an external network. Meanwhile, the video image rapid compression system provided by the invention has the advantages of simple structure, easiness in realization and lower development cost.
One aspect of the present invention provides a system for fast compressing video images, including: the device comprises a signal conversion unit, a control unit, an encoding unit, a storage unit and an upper computer; the signal conversion unit converts an original image signal into a single-ended image signal and sends the single-ended image signal to the control unit; the control unit converts the received single-ended image signal into a RAW format signal and sends the RAW format signal to the encoding unit; the encoding unit encodes the received RAW format signal to generate a compressed image signal and sends the compressed image signal to the control unit; the control unit receives the compressed image signal and writes the compressed image signal into a storage unit; and the upper computer accesses the storage unit to acquire the compressed image signal.
Preferably, the encoding unit includes: the system comprises an information input module, an image acquisition module and an image coding module; the information input module receives a RAW format signal and sets a coding mode aiming at the RAW format signal; sending the RAW format signal and the coding mode information to an image acquisition module; the image acquisition module acquires and caches the received RAW format signal and processes the RAW format signal by utilizing a three-frame caching mechanism; sending the processed RAW format signal and the coding mode information to an image coding module; and the image coding module codes the processed RAW format signal according to the received coding mode information to generate a compressed image signal.
Preferably, the coding mode is specifically: and coding according to the preset coding rate, the preset resolution and the preset frame frequency.
Preferably, after receiving the single-ended image signal, the control unit extracts mode judgment information from the single-ended image signal and sends the mode judgment information to the upper computer through the storage unit; the upper computer generates a mode confirmation instruction based on the mode judgment information and writes the mode confirmation instruction into the storage unit; the control unit queries the storage unit to obtain a mode confirmation instruction and sends the mode confirmation instruction to the information input module; the mode judgment information is the last line of data of the chrominance image corresponding to the original image.
Preferably, the information input module specifically sets the encoding mode as follows: the information input module sets the encoding mode to one of a fixed mode, a dynamic mode and an average mode according to the received mode confirmation instruction.
Preferably, the fixed mode is: coding according to a preset coding rate, a preset resolution and a preset frame frequency; the dynamic mode is as follows: coding according to the dynamic coding rate, the preset resolution and the preset frame frequency; the average mode is: and coding according to the average coding rate, the preset resolution and the preset frame frequency.
Preferably, after the image acquisition module acquires and buffers the received RAW format signal, the V4L2 is used to drive and encapsulate the RAW format signal; and after the image coding module codes the processed RAW format signal, packaging the coded signal into a BYTE-STREAM format.
Preferably, the signal conversion unit is an LVDS chip; the control unit is an FPGA chip; the coding unit is a DSP chip; the storage unit is a dual-port RAM; the encoding unit encodes the received RAW format signal specifically as follows: the encoding unit encodes the received RAW format signal by adopting the h.264 standard.
Another aspect of the present invention provides a method for fast compressing a video image, including: receiving an original image signal, converting the original image signal into a single-ended image signal, extracting mode judgment information from the single-ended image signal, and setting an encoding mode based on the mode judgment information; converting the single-ended image signal into a RAW format signal, encoding the RAW format signal according to a set encoding mode to generate a compressed image signal, and sending the compressed image signal to an upper computer through a dual-port RAM; the mode judgment information is the last line of data of the chrominance image corresponding to the original image.
Preferably, the setting of the encoding mode specifically includes: setting the encoding mode to one of a fixed mode, a dynamic mode and an average mode; wherein, the fixed mode is: coding according to a preset coding rate, a preset resolution and a preset frame frequency; the dynamic mode is as follows: coding according to the dynamic coding rate, the preset resolution and the preset frame frequency; the average mode is: and coding according to the average coding rate, the preset resolution and the preset frame frequency.
According to the video image rapid compression system and the video image rapid compression method, real-time collection of a large-resolution video image can be achieved, high-speed, high-compression-ratio and high-resolution data compression can be carried out on the video image by utilizing the internal correlation and statistical characteristics of the image, and the compressed image can be rapidly transmitted to an upper computer and an external network. Meanwhile, the video image rapid compression system provided by the invention has the advantages of simple structure, easiness in realization and lower development cost.
Drawings
FIG. 1 is a first schematic diagram of a video image fast compression system of the present invention;
FIG. 2 is a schematic diagram of a video image fast compression method according to the present invention;
FIG. 3 is a comparison graph of the effects before and after compression of the video image fast compression method according to the present invention;
fig. 4 is a second schematic diagram of the video image fast compression system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
The invention provides a video image rapid compression system and a method thereof, considering that the existing security video monitoring system needs huge data to be stored, processed and transmitted, and a method for performing high-speed compression on a high-resolution video image is urgently needed to solve the problem. The inventor observes that the video image has larger correlation and more data redundancy, and the correlation of the image data is eliminated or reduced by utilizing the correlation and the statistical property inside the image, so that the compression of the large-resolution image can be realized.
Generally, the goal of compressing video is to purposefully reduce data redundancy in video without losing human visual effect as much as possible. Since video is essentially composed of a continuous frame of still images, video data encoding algorithms are similar to those for still images. Meanwhile, the frames before and after the video image have the referential property, so that the compression ratio of the video image to the static image is more advantageous, and the higher compression ratio can be achieved.
The redundancy of video images is divided into temporal redundancy and spatial redundancy: the temporal redundancy means that a certain correlation exists between two adjacent video images; spatial redundancy refers to the presence of certain regular objects or identical textures in a single video image. Common video image redundancy also includes redundancy of information entropy, redundancy of vision, redundancy of knowledge, redundancy of structure, and the like. The video compression coding can remove the redundancy by processing the video image, thereby greatly improving the efficiency of video information storage and transmission.
The invention adopts DM368 as a video image encoder, the DM368 is a digital media processor based on Davinci technology, the operation speed is fast, the parallelism is strong, the ultra-long instruction and the peripheral interface are convenient, a 16-bit VPFE port is supported, the highest speed of the port is 120MHz, the data throughput per second is 240MB, the processor comprises a core of 1 ARM9 and 2 image cooperation processors, the encoding and decoding of video and image data in various formats such as H.264, MPEG-4, MPEG-2, MJPEG, JPEG 9/VCl and the like are supported, YUV422 digital signals input in formats such as H.601/BT.656/BT.1120 are supported, the H.264 compression of 1080p, 30fps (frame per second) color images can be realized, the high frame rate television image compression can be completed, and compressed data packets can be sent out in real time when working.
The video image rapid compression system and the video image rapid compression method can realize real-time acquisition of a large-resolution video image, perform high-speed, high-compression-ratio and high-resolution data compression on the video image by utilizing the internal correlation and statistical characteristics of the image, and can rapidly transmit the compressed image to an upper computer and an external network.
Fig. 1 shows a video image fast compression system of the present invention, as shown in fig. 1, the system comprising: signal conversion unit 1, control unit 3, coding unit 2, storage unit 4 and upper computer 5. The signal conversion unit 1 converts the original image signal into a single-ended image signal, and sends the single-ended image signal to the control unit 3. The control unit 3 converts the received single-ended image signal into a RAW format signal, and transmits the RAW format signal to the encoding unit 2. The encoding unit 2 encodes the received RAW format signal to generate a compressed image signal, and transmits the compressed image signal to the control unit 3. The control unit 3 receives the compressed image signal and writes the compressed image signal into the storage unit 4. The upper computer 5 accesses the storage unit 4 to acquire a compressed image signal. The invention realizes the real-time acquisition, compression and transmission of video images through the functions of each unit.
In the preferred embodiment of the present invention, the upper computer 5 transmits the compressed image signal to an external device through a wired or wireless network, thereby realizing high-speed transmission of the compressed image.
In the preferred embodiment of the present invention, the signal conversion unit 1 is an LVDS chip, the control unit 3 is an FPGA chip, the encoding unit 2 is a DSP chip, and the storage unit 4 is a dual-port RAM.
Preferably, in a preferred embodiment of the present invention, the coding unit 2 is a TMS320DM368 chip.
In the preferred embodiment of the present invention, the encoding unit 2 encodes the received RAW format signal in real time according to the h.264 standard. H.264 is a new generation of coding standard, which is known to be highly compressed, high quality and capable of supporting multiple network streaming media transmission, and coding a video image using the h.264 standard can greatly improve coding efficiency while ensuring high resolution and high compression ratio.
In a preferred embodiment of the present invention, the encoding unit 2 includes: the system comprises an information input module, an image acquisition module and an image coding module; the information input module receives a RAW format signal and sets a coding mode aiming at the RAW format signal; sending the RAW format signal and the coding mode information to an image acquisition module; the image acquisition module acquires and caches the received RAW format signal and processes the RAW format signal by utilizing a three-frame caching mechanism; sending the processed RAW format signal and the coding mode information to an image coding module; and the image coding module codes the processed RAW format signal according to the received coding mode information to generate a compressed image signal. The three-frame buffer stores at least three frames of image data in the buffer, thereby reducing the jitter of the back-end image.
Preferably, in a preferred embodiment of the present invention, the coding mode is specifically: and coding according to the preset coding rate, the preset resolution and the preset frame frequency. The preset encoding rate, the preset resolution and the preset frame frequency are fixed values set according to a specific application environment.
In the preferred embodiment of the invention, after receiving the single-ended image signal, the control unit 3 extracts the mode judgment information from the single-ended image signal and sends the mode judgment information to the upper computer 5 through the storage unit 4; the upper computer 5 generates a mode confirmation instruction based on the mode judgment information, and writes the mode confirmation instruction into a predetermined address of the storage unit 4; the control unit 3 queries the storage unit 4 to obtain a mode confirmation instruction, and sends the mode confirmation instruction to the information input module; the mode judgment information is the last line of data of the chrominance image corresponding to the original image. The mode confirm command is used to provide encoding mode setting information. The above steps can determine the coding mode through the chromatic value of the last line of data of the image, thereby realizing selectable, strong pertinence and more efficient image coding.
As a preferred scheme, the information input module specifically sets the encoding mode as follows: the information input module sets the encoding mode to one of a fixed mode, a dynamic mode and an average mode according to the received mode confirmation instruction. The fixed mode is as follows: coding according to a preset coding rate, a preset resolution and a preset frame frequency; the dynamic mode is as follows: coding according to the dynamic coding rate, the preset resolution and the preset frame frequency; the average mode is: and coding according to the average coding rate, the preset resolution and the preset frame frequency.
In the preferred embodiment of the present invention, after the image acquisition module acquires and buffers the received RAW format signal, the V4L2 is used to drive and encapsulate the RAW format signal; and after the image coding module codes the processed RAW format signal, packaging the coded signal into a BYTE-STREAM format.
Preferably, in a preferred embodiment of the present invention, the control unit 3 encapsulates the compressed image signal before writing the compressed image signal into the storage unit 4.
Fig. 2 shows a video image fast compression method of the present invention, as shown in fig. 2:
in step S1, the original image signal is received and converted into a single-ended image signal.
Next, in step S2, mode determination information is extracted from the single-ended image signal, and the encoding mode is set based on the mode determination information.
Next, in step S3, the one-end image signal is converted into a RAW format signal, and the RAW format signal is encoded according to the set encoding mode to generate a compressed image signal.
Next, in step S4, the compressed image signal is sent to the upper computer through the dual-port RAM.
The mode judgment information is the last line of data of the chrominance image corresponding to the original image.
In a preferred embodiment of the present invention, the upper computer transmits the compressed image signal to the external device through a wired or wireless network.
Preferably, in a preferred embodiment of the present invention, the setting of the coding mode specifically includes: setting the encoding mode to one of a fixed mode, a dynamic mode and an average mode; wherein, the fixed mode is: coding according to a preset coding rate, a preset resolution and a preset frame frequency; the dynamic mode is as follows: coding according to the dynamic coding rate, the preset resolution and the preset frame frequency; the average mode is: and coding according to the average coding rate, the preset resolution and the preset frame frequency.
Through the steps, the invention can realize the real-time acquisition of the large-resolution video image, and can perform high-speed, high-compression-ratio and high-resolution data compression on the video image by utilizing the internal correlation and statistical characteristics of the image, and can quickly transmit the compressed image to an upper computer and an external network. Meanwhile, the coding mode of the image is determined according to the chromatic value of the last line of data of the image, so that the image coding with strong pertinence and higher efficiency can be realized.
Fig. 3 shows the image effect contrast processed by the video image fast compression method of the present invention. As can be seen, the high-resolution images before and after compression have almost the same effect, the high-quality compression of the high-resolution images is proved by the invention, and the high-resolution image compression method has higher engineering practicability.
Fig. 4 is a second schematic diagram of the video image rapid compression system of the present invention, which shows the specific hardware configuration of the video image rapid compression system and the functions thereof.
The software code of the invention is realized by adopting the mixed programming of a special C language and a special assembly language, is solidified on DSP hardware after being compiled, and the DSP automatic loading program runs after being electrified.
The video image rapid compression system and the method provided by the invention can achieve the following technical effects:
1)300: a high compression ratio of 1;
2) compressing an image within 3.3 ms;
3) high-resolution compression is realized, and the image resolution can reach 400 ten thousand pixels;
4) and high-speed data transmission between the hardware system and the upper computer is realized.
Those skilled in the art will appreciate that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer readable storage medium, such as: ROM/RAM, magnetic disk, optical disk, etc.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (7)
1. A video image fast compression system, comprising: the device comprises a signal conversion unit, a control unit, an encoding unit, a storage unit and an upper computer; wherein,
the signal conversion unit converts an original image signal into a single-ended image signal and sends the single-ended image signal to the control unit;
the control unit converts the received single-ended image signal into a RAW format signal and sends the RAW format signal to the encoding unit;
the encoding unit encodes the received RAW format signal to generate a compressed image signal and sends the compressed image signal to the control unit;
the control unit receives the compressed image signal and writes the compressed image signal into a storage unit;
the upper computer accesses a storage unit to obtain the compressed image signal;
wherein the encoding unit includes: the system comprises an information input module, an image acquisition module and an image coding module;
the information input module receives the RAW format signal and sets a coding mode aiming at the RAW format signal; sending the RAW format signal and the coding mode information to an image acquisition module;
the image acquisition module acquires and caches the received RAW format signal and processes the RAW format signal by utilizing a three-frame caching mechanism; sending the processed RAW format signal and the coding mode information to an image coding module;
and the image coding module codes the processed RAW format signal according to the received coding mode information to generate a compressed image signal.
2. The system of claim 1, wherein the coding mode is specifically: and coding according to the preset coding rate, the preset resolution and the preset frame frequency.
3. The system of claim 1,
after receiving the single-ended image signal, the control unit extracts mode judgment information from the single-ended image signal and sends the mode judgment information to an upper computer through a storage unit;
the upper computer generates a mode confirmation instruction based on the mode judgment information and writes the mode confirmation instruction into the storage unit;
the control unit queries the storage unit to obtain a mode confirmation instruction and sends the mode confirmation instruction to the information input module; the mode judgment information is the last line of data of the chrominance image corresponding to the original image.
4. The system of claim 3, wherein the information input module sets the encoding mode to be specifically: the information input module sets the encoding mode to one of a fixed mode, a dynamic mode and an average mode according to the received mode confirmation instruction.
5. The system of claim 4,
the fixed mode is as follows: coding according to a preset coding rate, a preset resolution and a preset frame frequency;
the dynamic mode is as follows: coding according to the dynamic coding rate, the preset resolution and the preset frame frequency;
the average mode is: and coding according to the average coding rate, the preset resolution and the preset frame frequency.
6. The system of claim 5,
after the image acquisition module acquires and caches the received RAW format signals, the V4L2 is adopted to drive and package the RAW format signals;
and after the image coding module codes the processed RAW format signal, packaging the coded signal into a BYTE-STREAM format.
7. The system according to any one of claims 1 to 6, wherein the signal conversion unit is an LVDS chip; the control unit is an FPGA chip; the coding unit is a DSP chip; the storage unit is a dual-port RAM;
the encoding unit encodes the received RAW format signal specifically as follows: the encoding unit encodes the received RAW format signal by adopting the h.264 standard.
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| CN112887682B (en) * | 2021-02-23 | 2023-07-07 | 中国铁道科学研究院集团有限公司 | Multi-path track image synchronous acquisition and storage system and method |
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