CN109274955B - Compression and synchronization method and system for light field video and depth map, and electronic equipment - Google Patents
Compression and synchronization method and system for light field video and depth map, and electronic equipment Download PDFInfo
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Abstract
The invention provides a compression and synchronization method of a light field video and a depth map, which comprises the following steps: receiving and decoding image data captured by a light field system camera array; the image data includes: frame data of a traditional image and frame data of a depth image; wherein, the end of each frame data is provided with a cycle counting serial number; a synchronization thread is enabled to respectively call back the decoded data of the frame data under each cycle count serial number to a compression thread in the sequence of the cycle count serial numbers from small to large in the synchronization interval; enabling the compression thread to perform parallel compression operation on the synchronized frame data transmitted by the synchronization thread; and sending a trigger signal to the stream pushing server to enable the stream pushing server to transmit the compressed light field video data with the depth map. The method is beneficial to improving the transmission efficiency of the light field video data with the depth map, and solves the problems that the data transmission pressure is large, the occupied storage space and bandwidth resources are more, the depth map cannot be carried, the asymmetric frame arrival is easy to occur and the like in the light field video data transmission.
Description
Technical Field
The present invention relates to the field of light field video data transmission technologies, and in particular, to a method, a system, and an electronic device for compressing and synchronizing a light field video and a depth map.
Background
The light field video is composed of a series of light field images generated by a professional light field system through continuous shooting, and is mostly used for the reconstruction of three-dimensional objects, the reconstruction of three-dimensional environments and the stereo reproduction of dynamic objects. In order to improve the details and the truth of a target object, a high frame rate, a high pixel and a depth map are often required to be supported, however, in this case, problems that the transmission pressure of light field video data is large, the occupied storage space and the transmission bandwidth resources are many, the depth map cannot be carried, asymmetric frame arrival is easy to occur, and the like are often caused.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a method, a system, and an electronic device for compressing and synchronizing light field video and depth map, which are used to solve the above problems in light field video data transmission in the prior art.
To achieve the above and other related objects, the present invention provides a method for compressing and synchronizing a light field video and a depth map, comprising: receiving and decoding image data captured by a light field system camera array; the image data includes: frame data of a traditional image and frame data of a depth image; wherein, the end of each frame data is provided with a cycle count serial number; a synchronization thread is enabled to respectively call back the decoded data of the frame data under each cycle count serial number to a compression thread in the sequence of the cycle count serial numbers from small to large in the synchronization interval; enabling the compression thread to perform parallel compression operation on the synchronized frame data transmitted by the synchronization thread; and sending a trigger signal to a plug flow server to enable the plug flow server to transmit the compressed light field video data with the depth map.
In an embodiment of the present invention, the method further includes: and sending a synchronization signal to the light field system camera array every other preset frame number so as to reset the cycle count serial number of the frame data of the current image data to an initial value when the light field system camera array receives the synchronization signal.
In an embodiment of the present invention, the preset number of frames is specifically: and calculating the value of the maximum frame number according to the period of the synchronous signal and the frame rate of the cameras in the light field system camera array.
In an embodiment of the present invention, the method further includes: detecting a cycle count number of each frame data while transmitting a synchronization signal; if the frame number greater than the maximum frame number exists, subtracting the maximum frame number from the frame number.
In an embodiment of the present invention, the method further includes: and adjusting the data bit information of the conventional BGR data and the depth data before the parallel compression operation is carried out by the compression thread so as to lead the information degree distribution to be close to a rule.
To achieve the above and other related objects, the present invention provides a system for compressing and synchronizing a light field video and a depth map, comprising: the data receiving module is used for receiving and decoding image data shot by the light field system camera array; the image data includes: frame data of a traditional image and frame data of a depth image; wherein, the end of each frame data is provided with a cycle count serial number; the compression synchronization module is used for enabling a synchronization thread to respectively call back the decoded data of the frame data under each cycle count serial number to a compression thread according to the sequence of the cycle count serial numbers from small to large in the synchronization interval; enabling the compression thread to perform parallel compression operation on the synchronized frame data transmitted by the synchronization thread; and the signal triggering module is used for sending a triggering signal to the plug flow server so as to enable the plug flow server to transmit the compressed light field video data with the depth map.
In an embodiment of the present invention, the compression synchronization module is further configured to: and sending a synchronization signal to the light field system camera array every other preset frame number so as to reset the cycle count serial number of the frame data of the current image data to an initial value when the light field system camera array receives the synchronization signal.
In an embodiment of the present invention, the preset number of frames is specifically: and calculating the value of the maximum frame number according to the period of the synchronous signal and the frame rate of the cameras in the light field system camera array.
In an embodiment of the present invention, the compression synchronization module is further configured to: detecting a cycle count number of each frame data while transmitting a synchronization signal; if the frame number greater than the maximum frame number exists, subtracting the maximum frame number from the frame number.
In an embodiment of the present invention, the compression synchronization module is further configured to: and adjusting the data bit information of the conventional BGR data and the depth data before the parallel compression operation is carried out by the compression thread so as to lead the information degree distribution to be close to a rule.
To achieve the above and other related objects, the present invention provides a storage medium, in which a computer program is stored, and the computer program, when loaded and executed by a processor, implements the compression and synchronization method for light field video and depth map as described in any one of the above.
To achieve the above and other related objects, the present invention provides an electronic device, comprising: a processor and a memory; wherein the memory is for storing a computer program; the processor is configured to load and execute the computer program to cause the electronic device to execute the method for compressing and synchronizing the light field video and the depth map as described in any one of the above.
As described above, the method, system and electronic device for compressing and synchronizing light field video and depth map according to the present invention have the following advantages: the method is beneficial to improving the transmission efficiency of the light field video data with the depth map, thereby overcoming the defects that the data transmission pressure is large, the occupied storage space and bandwidth resources are more, the depth map cannot be carried, the asymmetric frame arrival is easy to occur and the like in the current light field video data transmission process.
Drawings
Fig. 1 is a flowchart illustrating a method for compressing and synchronizing a light field video and a depth map according to an embodiment of the present invention.
Fig. 2 is a block diagram of a system for compressing and synchronizing light field video and depth maps according to an embodiment of the present invention.
Fig. 3 is a block diagram of an electronic device according to an embodiment of the invention.
Description of the element reference numerals
S1-S4
Compression and synchronization system for 20 light field video and depth map
21 data receiving module
22 compression synchronization module
23 signal trigger module
31 bus
32 memory
33 processor
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
In view of the problems that the transmission pressure of light field video data is large, a depth map cannot be carried, asymmetric frame arrival is easy to occur and the like in the prior art, the invention provides a compression and synchronization method and a compression and synchronization system of a light field video and a depth map, so that the light field video data with the depth map can be transmitted efficiently.
The invention mainly adopts a multi-channel redundancy compression method to compress and transmit the light field video data with the depth map, and simultaneously, a frame marking method is utilized to complete the synchronization of data streams. Before explaining the technical solution of the present invention, it should be noted that the reason for performing the synchronization processing on the frame data of the light field video mainly lies in the following two points:
1. the camera array for acquiring the light field image comprises a traditional image frame data stream and a depth image frame data stream which are generated in acquisition equipment under different architectures, if corresponding synchronous signal processing is carried out on an external physical layer, the overhead and difficulty coefficient are inevitably high, and therefore synchronous processing of data frames is carried out by adopting synchronous logic on a software system layer;
2. since the transmission of each channel from the camera array to the data processing device has different network arrival time differences, in most cases, the frame data received by the data processing device is not the frame data in the same time axis, and therefore, the video frame data of the whole process needs to be synchronized.
Referring to fig. 1, a flow chart of a method for compressing and synchronizing a light field video and a depth map according to the present invention is shown in an embodiment, where the method of the present embodiment is executed by an electronic device communicatively connected to a light field system camera array, for example: desktop, laptop, tablet, smartphone, and the like. Specifically, the method comprises the following steps:
s1: image data captured by a light field system camera array is received and decoded.
In detail, in this step, the image data includes frame data of a conventional image generated by a light field system camera array shooting, and frame data of a depth image. The light field system camera array sends several frames of data to the electronic device every second, and the electronic device receives the image data arriving at the difference time from the broadband and buffers it. The frame data is, for example, 4-channel BGR-Depth data (RGB data is distributed in the order of Blue, Green, Red, and is finally appended with Depth data), and specifically, for each frame data, a cycle count number of a certain byte (e.g., 2 bytes) is appended to the end of the frame data, and the cycle count number is used as a frame number of the frame data for subsequent synchronization.
It should be noted that the electronic device decodes each received frame of data, and it can be ensured that the recalled data does not generate a screen splash phenomenon.
S2: and enabling a synchronous thread to respectively call back the decoded data of the frame data under each cycle count sequence number to a compression thread according to the sequence of the cycle count sequence numbers from small to large in the synchronous interval.
In this step, a period from when the electronic device sends one synchronization signal to the light field system camera array to when another synchronization signal is sent to the light field system camera array again before step S1 is executed is referred to as a synchronization interval. In detail, the electronic device sends a synchronization signal to the light field system camera array every preset number of frames, so that the light field system camera array resets the cycle count number of the frame data of the current image data to an initial value when receiving the synchronization signal. The preset frame number is specifically a value of a maximum frame number calculated according to the period of the synchronization signal and the frame rate of the camera in the light field system camera array. Such as: when the period of the synchronization signal is 500ms and the frame rate of the camera is 30fps, the calculated maximum cycle count number is 500ms × 30fps which is 15 frames, the electronic device sends a synchronization signal to the light field system camera array every 15 frames, and the light field system camera array resets the cycle count number of the frame data of the current image data to 1 when receiving the synchronization signal.
In the synchronization interval, the electronic device starts a synchronization thread to perform synchronization processing on the cached image data: firstly, acquiring frame data of all channels under the current minimum cycle count serial number from a cache; secondly, the decoded data obtained by decoding the frame data in the step S1 is called back to a compression thread; and thirdly, after the compression thread executes subsequent compression processing, the synchronization thread acquires the frame data of all channels under the lowest cycle count sequence number in the cycle count sequence numbers left after the processed minimum cycle count sequence number is removed from the cache, and the frame data is circulated until the current frame sequence number reaches the maximum cycle count sequence number in the synchronization interval. It should be noted that, at this time, the electronic device will enter the next synchronization interval, the cycle count number is reset to the initial value in the new synchronization interval, and step S2 is executed to repeat the above process from the minimum cycle count number to the maximum cycle count number.
S3: and enabling the compression thread to perform parallel compression operation on the synchronized frame data transmitted by the synchronization thread.
And receiving the above, the compression thread compresses the synchronized frame data transmitted by the synchronization thread. Preferably, the compression thread further processes the frame data before performing the parallel compression, for example: the data bit information of the normal BGR data and the depth data is adjusted so that the information degree distribution tends to be regular, and the like. The frame data is then distributed into a GPU buffer and subjected to parallel compression operations using high-speed multi-bit PNG lossless encoding.
S4: and sending a trigger signal to a plug flow server to enable the plug flow server to transmit the compressed light field video data with the depth map.
After the parallel compression operation of step S3 is completed, the electronic device sends a trigger signal to the push streaming server, so that the push streaming server pulls the compressed output, thereby preparing for transmission of the light field video data with the depth map. Of course, before transmission, the electronic device encapsulates header data of protocols such as RTMP, RTSP, HTTP, etc. for frame data to be transmitted, and then transmits the header data to a server for data distribution.
Considering that the electronic device is in a high-intensity long-time operating state, the camera array of the light field system may have a case where the current synchronization signal is not received by the individual camera devices, which causes the cycle count number of the frame data to be incremented until the next synchronization signal is triggered, so that the value of the cycle count number is greater than the predetermined highest value, such as 15 in the foregoing example.
In view of this, in an embodiment, further, triggering of the synchronization signal is correspondingly fault-tolerant. By performing a fault-tolerant process on the frame sequence number, a frame sequence number detection link is added, namely, the electronic equipment detects the cycle count sequence number of the frame data of the current image data of the light field system camera array while sending a synchronous signal to the light field system camera array. If it is detected that there is a frame number greater than the predetermined maximum cycle count number, the frame number is subtracted by the number of frames of a synchronization period, so that it is ensured that the maximum cycle count number in the synchronization mechanism is the expected maximum cycle count number, as shown in 15 in the foregoing example.
All or part of the steps for implementing the above method embodiments may be performed by hardware associated with a computer program. Based upon such an understanding, the present invention also provides a computer program product comprising one or more computer instructions. The computer instructions may be stored in a computer readable storage medium. The computer-readable storage medium can be any available medium that a computer can store or a data storage device, such as a server, a data center, etc., that is integrated with one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
Referring to fig. 2, the present embodiment provides a system 20 for compressing and synchronizing a light field video and a depth map, which is installed in an electronic device as a piece of software to execute the method for compressing and synchronizing a light field video and a depth map in the foregoing method embodiment during running. Since the technical principle of the embodiment of the system is similar to that of the embodiment of the method, repeated description of the same technical details is omitted.
The system 20 for compressing and synchronizing the light field video and the depth map of the present embodiment specifically includes: a data receiving module 21, a compression synchronization module 22 and a signal triggering module 23. The data receiving module 21 is configured to perform the step S1 described in the foregoing method embodiment, the compression synchronization module 22 is configured to perform the steps S2 to S3 described in the foregoing method embodiment, and the signal triggering module 23 is configured to perform the step S4 described in the foregoing method embodiment.
Those skilled in the art should understand that the division of the modules in the embodiment of fig. 2 is only a logical division, and the actual implementation can be fully or partially integrated into one or more physical entities. And the modules can be realized in a form that all software is called by the processing element, or in a form that all the modules are realized in a form that all the modules are called by the processing element, or in a form that part of the modules are called by the hardware. For example, the compressing and synchronizing module 22 may be a separate processing element, or may be integrated in a chip, or may be stored in a memory in the form of program code, and a certain processing element calls and executes the function of the compressing and synchronizing module 22. Other modules are implemented similarly. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, each step of the above method or each module above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in the form of software.
Referring to fig. 3, the embodiment provides an electronic device, which may be a desktop computer, a portable computer, a smart phone, or the like. In detail, the electronic device comprises at least, connected by a bus 31: a memory 32 and a processor 33, wherein the memory 32 is used for storing a computer program, and the processor 33 is used for executing the computer program stored in the memory 32 to execute all or part of the steps of the foregoing method embodiments.
The above-mentioned system bus may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The system bus may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus. The communication interface is used for realizing communication between the database access device and other equipment (such as a client, a read-write library and a read-only library). The Memory may include a Random Access Memory (RAM), and may further include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory.
The Processor may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component.
In summary, according to the method, the system and the electronic device for compressing and synchronizing the light field video and the depth map, the light field video data with the depth map is compressed and transmitted by the multi-channel redundancy compression method, and meanwhile, the data stream is synchronized by using the frame marking method, so that the transmission efficiency of the light field video data with the depth map is improved, and the problems that the data transmission pressure is large, the occupied storage space and bandwidth resources are large, the depth map cannot be carried, the asymmetric frame arrival is easy to occur and the like in the current light field video data transmission are solved. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (12)
1. A method for compressing and synchronizing a light field video and a depth map is characterized by comprising the following steps:
receiving and decoding image data captured by a light field system camera array; the image data includes: frame data of a traditional image and frame data of a depth image; wherein, the end of each frame data is provided with a cycle count serial number;
a synchronization thread is enabled to respectively call back the decoded data of the frame data under each cycle count serial number to a compression thread in the sequence of the cycle count serial numbers from small to large in the synchronization interval; wherein the synchronization interval refers to a time interval during which a synchronization signal is transmitted to the light field system camera array before the image data is received and decoded;
enabling the compression thread to perform parallel compression operation on the synchronized frame data transmitted by the synchronization thread;
and sending a trigger signal to a plug flow server to enable the plug flow server to transmit the compressed light field video data with the depth map.
2. The method of claim 1, further comprising: and sending a synchronization signal to the light field system camera array every other preset frame number so as to reset the cycle count serial number of the frame data of the current image data to an initial value when the light field system camera array receives the synchronization signal.
3. The method according to claim 2, wherein the preset number of frames is specifically: and calculating the value of the maximum frame number according to the period of the synchronous signal and the frame rate of the cameras in the light field system camera array.
4. The method of claim 3, further comprising:
detecting a cycle count number of each frame data while transmitting a synchronization signal;
if the frame number greater than the maximum frame number exists, subtracting the maximum frame number from the frame number.
5. The method of claim 1, further comprising: and adjusting the data bit information of the conventional BGR data and the depth data before the parallel compression operation is carried out by the compression thread so as to lead the information degree distribution to be close to a rule.
6. A system for compressing and synchronizing a light field video and a depth map, comprising:
the data receiving module is used for receiving and decoding image data shot by the light field system camera array; the image data includes: frame data of a traditional image and frame data of a depth image; wherein, the end of each frame data is provided with a cycle count serial number;
the compression synchronization module is used for enabling a synchronization thread to respectively call back the decoded data of the frame data under each cycle count serial number to a compression thread according to the sequence of the cycle count serial numbers from small to large in the synchronization interval; enabling the compression thread to perform parallel compression operation on the synchronized frame data transmitted by the synchronization thread; wherein the synchronization interval refers to a time interval during which a synchronization signal is transmitted to the light field system camera array before the image data is received and decoded;
and the signal triggering module is used for sending a triggering signal to the plug flow server so as to enable the plug flow server to transmit the compressed light field video data with the depth map.
7. The system of claim 6, wherein the compression synchronization module is further configured to: and sending a synchronization signal to the light field system camera array every other preset frame number so as to reset the cycle count serial number of the frame data of the current image data to an initial value when the light field system camera array receives the synchronization signal.
8. The system according to claim 7, wherein the preset number of frames is specifically: and calculating the value of the maximum frame number according to the period of the synchronous signal and the frame rate of the cameras in the light field system camera array.
9. The system of claim 8, wherein the compression synchronization module is further configured to: detecting a cycle count number of each frame data while transmitting a synchronization signal; if the frame number greater than the maximum frame number exists, subtracting the maximum frame number from the frame number.
10. The system of claim 6, wherein the compression synchronization module is further configured to: and adjusting the data bit information of the conventional BGR data and the depth data before the parallel compression operation is carried out by the compression thread so as to lead the information degree distribution to be close to a rule.
11. A storage medium in which a computer program is stored which, when loaded and executed by a processor, implements the method of compression and synchronization of light field video and depth maps according to any one of claims 1 to 5.
12. An electronic device, comprising: a processor and a memory; wherein the content of the first and second substances,
the memory is used for storing a computer program;
the processor is configured to load and execute the computer program to cause the electronic device to execute the method for compressing and synchronizing the light field video and the depth map according to any one of claims 1 to 5.
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