CN113079336A - High-speed image recording method and device - Google Patents
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- H—ELECTRICITY
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- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/917—Television signal processing therefor for bandwidth reduction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/907—Television signal recording using static stores, e.g. storage tubes or semiconductor memories
Abstract
The invention relates to a video recording method and a device of high-speed images, wherein the method comprises the following steps: acquiring high-speed image data, and storing the high-speed image data in a DRAM (dynamic random access memory) in real time; reading out the high-speed image data stored in the DRAM, respectively transmitting the high-speed image data to a plurality of USB controllers according to a preset processing strategy, and compressing the high-speed image data based on the plurality of USB controllers; and transmitting the compressed data to a computer through the USB hub for storage. By the method, the stored data volume can be effectively reduced, the compression of the image with high frame number is realized, the compressed data can be effectively transmitted to a computer, and the effect of recording the high-speed image for a long time is achieved.
Description
Technical Field
The present invention relates to the field of high-speed imaging technologies, and in particular, to a method and an apparatus for recording high-speed images.
Background
In many areas of subject research, it is often desirable to observe rapidly changing physical or chemical phenomena using high-speed cameras. In practical application, the mass image data shot by the high-speed camera can only be stored in the memory of the camera due to the limitation of the bandwidth of the data transmission interface of the camera. Because the memory cost is high, the memory capacity of the camera is usually small, and the large-capacity image data storage is difficult to realize, so that the high-resolution video cannot be shot for a long time.
The standard frame number of the current video recording is 25 frames or 30 frames per second, the frame number of the double video recording is 50 frames or 60 frames, if 3000 frames per second of video is to be recorded, because the speed is too fast and the data volume is too large, the current method is to directly store the video in a DRAM (dynamic random access memory) to meet the requirement of correctly storing the video speed, but because the DRAM capacity is limited, the video can only be stored for several seconds or dozens of seconds, a long-time high-speed video recording is not available, and the video can not be stored to the required time point just for the instant dynamic activity.
Disclosure of Invention
Accordingly, there is a need for a method and apparatus for recording high-speed video, which can effectively reduce the amount of data to be stored and record high-speed video for a long time.
A method for recording high-speed images comprises the following steps:
acquiring high-speed image data, and storing the high-speed image data in a DRAM (dynamic random access memory) in real time;
reading out the high-speed image data stored in the DRAM, respectively transmitting the high-speed image data to a plurality of USB controllers according to a preset processing strategy, and compressing the high-speed image data based on the plurality of USB controllers;
and transmitting the compressed data to a computer through the USB hub for storage.
In one embodiment, the acquiring high-speed image data and storing the high-speed image data in a DRAM in real time includes:
the high-speed image data are obtained based on a high-speed image sensor and are respectively stored in a first DRAM and a second DRAM, wherein the first DRAM is used for writing the high-speed image data, and the second DRAM is used for reading the high-speed image data.
In one embodiment, the reading out the high-speed image data stored in the DRAM and transmitting the read out high-speed image data to the plurality of USB controllers according to a predetermined processing policy respectively includes:
and writing data and reading data alternately by adopting a ping-pong architecture, and sequentially distributing the high-speed image data stored in the DRAM to a plurality of USB controllers according to the number of frames during reading.
In one embodiment, the sequentially allocating the high-speed image data stored in the DRAM to the plurality of USB controllers by frame number at the time of reading includes:
and transmitting the first frame of image to a first USB controller, transmitting the next frame of image to a second USB controller, and sequentially and circularly distributing the high-speed image data to a preset number of USB controllers.
In one embodiment, the reading out the high-speed image data stored in the DRAM and transmitting the read out high-speed image data to the plurality of USB controllers according to a predetermined processing policy further includes:
and determining the distribution number of the USB controller according to the number of frames per second of the high-speed images to be recorded and the number of frames per second of processing of the USB controller.
In one embodiment, the compressing the high-speed image data based on a plurality of USB controllers includes:
the USB controller compresses the high-speed image data into an h.264 format, and reduces the data volume to 1% -2%.
In one embodiment, the transmitting the compressed data to the computer via the USB hub includes:
and determining the number of the USB hubs according to the number of the USB controllers, and respectively storing the compressed data in the plurality of USB controllers into a computer based on the USB hubs to correspondingly form a plurality of independent image data.
In one embodiment, the method further comprises:
when a high-speed image needs to be played, decompressing and merging the independent image data based on preset software, forming a new image file after compression, and playing the image file.
In one embodiment, the decompressing and merging the independent image data based on the preset software, forming a new image file after compression, and playing the image file includes:
selecting one independent image data as a normal speed to play when playing the image, and selecting a time point needing to display the high-speed image in the playing process;
reading image data stored in the computer through preset software, and synthesizing a plurality of image data with preset duration before and after the time point into a new image file;
and playing and testing the image file through a player to obtain a slow motion image under high-speed shooting.
A video recording device of high-speed images comprises an image controller, a DRAM, a USB controller, a USB concentrator and a computer, wherein the image controller is electrically connected with the DRAM, and the image controller, the USB concentrator and the computer are sequentially and electrically connected;
the image controller is used for acquiring high-speed image data and storing the high-speed image data in the DRAM in real time;
the image controller is also used for reading out the high-speed image data stored in the DRAM, respectively transmitting the high-speed image data to the plurality of USB controllers according to a preset processing strategy, and compressing the high-speed image data based on the plurality of USB controllers;
and the USB hub transmits the compressed data to the computer for storage.
According to the high-speed image recording method and device, the high-speed image data are acquired and stored in the DRAM in real time, the high-speed image data stored in the DRAM are read out and respectively transmitted to the USB controllers according to the preset processing strategy, the high-speed image data are compressed based on the USB controllers, and the compressed data are transmitted to the computer for storage through the USB hub. By the method, the stored data volume can be effectively reduced, the compression of the image with high frame number is realized, the compressed data can be effectively transmitted to a computer, and the effect of recording the high-speed image for a long time is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow diagram of a method for recording high-speed images, according to one embodiment;
FIG. 2 is a block diagram of an embodiment of a high-speed video recording apparatus;
FIG. 3 is a diagram illustrating data allocation of a USB controller according to one embodiment;
FIG. 4 is a diagram illustrating high speed image readout reconstruction in one embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first device may be termed a second device, and, similarly, a second device may be termed a first device, without departing from the scope of the present invention. The first device and the second device are both devices having common properties, but are not the same device.
Fig. 1 is a flowchart of a high-speed image recording method according to an embodiment, which can effectively reduce the amount of stored data, record a high-speed image for a long time, and reconstruct an original super-speed image from a stored super-speed image file by playing the image file at a normal speed at a time point required for finding the original super-speed image. Wherein a high-speed image may be understood as an image having an ultra-high number of frames per second, for example 3000 frames per second. The data size of the ultra-high speed video is calculated by taking the size of the HD video as an example: 3000fps 1MB is 3000MB/s, which is equivalent to 3GB data per second, and only 21 seconds can be stored by 64GB DRAM, and real-time compression can be realized by the high-speed image recording method provided by the embodiment, so that the high-speed image can be recorded for a long time. As shown in fig. 1, the method for recording high-speed images includes the following steps 102 to 106:
step 102: and acquiring high-speed image data, and storing the high-speed image data in a DRAM (dynamic random access memory) in real time.
Specifically, in the present embodiment, high-speed image data is acquired based on a high-speed image sensor, for example, a high-speed camera is used to acquire an image at a high frame rate through a CCD (Charge-coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor, so as to form the high-speed image data. And respectively storing the acquired high-speed image data in a first DRAM and a second DRAM, wherein the first DRAM is used for writing the high-speed image data, and the second DRAM is used for reading the high-speed image data. The embodiment respectively stores the high-speed image data in two DRAMs at high speed in real time, one writing and one reading are carried out, the data writing is completed, the mode is switched to the reading mode, the reading completion is switched to the writing mode, and the data reading and writing efficiency is improved.
Step 104: and reading out the high-speed image data stored in the DRAM, respectively transmitting the high-speed image data to a plurality of USB controllers according to a preset processing strategy, and compressing the high-speed image data based on the plurality of USB controllers.
Specifically, the ping-pong architecture is adopted to alternately write data and read data, and can be pre-designed in the DRAM and called by the DRAM when reading and writing data. The ping-pong architecture is a data caching means, and the efficiency of data transmission can be improved through the ping-pong operation. The two cache regions are defined through a ping-pong architecture, when data comes in, a process which is responsible for writing into the cache regions finds a first unoccupied and writable cache region, writes is carried out, after the data is written, an occupied mark is released, meanwhile, a mark is set to prompt that the cache region is readable, and then another writable cache region is found next, and new data is written. Similarly, the read-in process also detects the state of the buffer area all the time, and once the buffer area is found to be unoccupied and can be read, the data of the buffer area is taken out and then marked as writable.
Further, the high-speed image data stored in the DRAM are sequentially distributed to the plurality of USB controllers according to the number of frames when the data are read. Specifically, a first frame of image is transmitted to the first USB controller, a next frame of image is transmitted to the second USB controller, and the high-speed image data is sequentially distributed to a preset number of USB controllers in a circulating manner. For example, 50 USB controllers are required to record 3000 frames per second, and high-speed image data in the DRAM is transmitted to 50 USB controllers respectively when reading data.
Step 106: and transmitting the compressed data to a computer through the USB hub for storage.
The USB hub is a device that can expand one USB interface into a plurality of USB interfaces and can use these USB interfaces simultaneously. The data compressed by the USB controllers is transmitted to the USB hub and then transmitted to the computer through the USB hub, and the computer stores the compressed data. It should be noted that the USB hubs may be 1-in-4 hubs, and the number of USB hubs may be determined according to the number of USB controllers. The compressed data in the USB controllers are respectively stored in the computer based on the USB hub, and a plurality of independent image data are correspondingly formed.
The video recording method of the high-speed image can effectively reduce the amount of stored data, realize the compression of the image with high frame number, effectively transmit the compressed data to a computer, and achieve the effect of recording the high-speed image for a long time.
Fig. 2 is a block diagram of a high-speed image recording apparatus according to an embodiment of the present invention, which is used to implement a high-speed image recording method based on the high-speed image recording apparatus according to the present embodiment. Specifically, the super-speed image 210 output by the super-speed image sensor is transmitted to the image controller 220, and the image controller 220 stores the image data in the DRAM 230 in real time and performs read/write switching through a ping-pong architecture in the DRAM 230. The image controller 220 reads out the image data in the DRAM 230 and transmits the image data to the USB controller 240, because the data size is very large, a plurality of USB controllers 240 are required, for example, 3000 frames per second of image is to be recorded, and 50 USB controllers 240 are required for one USB controller 240 with a processing capacity of 60 frames per second, the image is compressed into h.264 format by the USB controller 240, the data size is reduced to 1% -2%, and then transmitted to the USB hub 250, and transmitted to the computer 260 through the USB hub 250, the computer 260 stores the compressed file, the USB bandwidth can be achieved through compression, and the computer storage can also be easily achieved.
Referring to fig. 3, a schematic diagram of data allocation of the USB controller according to an embodiment is shown, in which a first frame of image is transmitted to the first USB controller, a next frame of image is transmitted to the second USB controller, and the high-speed image data is sequentially and cyclically allocated to a predetermined number of USB controllers. Specifically, taking an example that 50 USB controllers are required to record 3000 frames per second images, a ping-pong architecture is adopted, when reading, data in a DRAM is respectively sent to 50 USB controllers, the 50 USB controllers operate simultaneously, each frame of image is arranged as shown in fig. 3, a first frame is sent to a USB controller 1, a second frame is sent to a USB controller 2, and a 50 th frame is sent to a USB controller 50, such a cyclic transmission can reduce the processing frame number of each USB controller to 60fps, the USB controller can easily compress the data, such as h.264, and the compressed image file after compression is sent to a computer for storage through a USB interface.
In one embodiment, the step 106 of transmitting the compressed data to the computer via the USB hub includes: the number of the USB hubs is determined according to the number of the USB controllers, and the compressed data in the plurality of USB controllers are respectively stored in the computer on the basis of the USB hubs to correspondingly form a plurality of independent image data. Specifically, the compression ratio of the compressed data is about 100 times, the 3GB/s data can be reduced to 30 MB/s-60 MB/s, which is still lower than the USB3.0 bandwidth (about 500MB/s), so the compressed data can be effectively transmitted to the computer, and after being transmitted to the computer, the computer can be stored into 50 files, wherein each file is independent image data.
In one embodiment, the method for recording high-speed video further comprises: when a high-speed image needs to be played, decompressing and merging the independent image data based on preset software, forming a new image file after compression, and playing the image file. Specifically, one of the independent image data is selected as normal speed playing when the image is played, and a time point needing to display the high-speed image is selected in the playing process; reading image data stored in the computer through preset software, and synthesizing a plurality of image data with preset duration before and after the time point into a new image file; and playing and testing the image file through a player to obtain a slow motion image under high-speed shooting.
For example, one of the files is selected as a normal speed play during the play, and a time point requiring high-speed photographing is found during the play, as shown in fig. 4, assuming that the time point is x, software can set a time before and after the x point, for example, one minute each, and the imaging software reads 50 files to re-synthesize the images before and after the x point into a new image File, for example, File x equals …, x-50, x-49, …, x-2, x-1, x, x +1, x +2, …, x +49, x +50, …, and then File x is a high-speed image before and after the x point, and a slow motion image under high-speed photographing can be obtained by using a player with 30 frames per second or 60 frames.
According to the high-speed image recording method and device, the high-speed image data are acquired and stored in the DRAM in real time, the high-speed image data stored in the DRAM are read out and respectively transmitted to the USB controllers according to the preset processing strategy, the high-speed image data are compressed based on the USB controllers, and the compressed data are transmitted to the computer for storage through the USB hub. By the method, the stored data volume can be effectively reduced, the compression of the image with high frame number is realized, the compressed data can be effectively transmitted to a computer, and the effect of recording the high-speed image for a long time is achieved.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for recording high-speed images, comprising:
acquiring high-speed image data, and storing the high-speed image data in a DRAM (dynamic random access memory) in real time;
reading out the high-speed image data stored in the DRAM, respectively transmitting the high-speed image data to a plurality of USB controllers according to a preset processing strategy, and compressing the high-speed image data based on the plurality of USB controllers;
and transmitting the compressed data to a computer through the USB hub for storage.
2. The method of claim 1, wherein the acquiring high-speed image data and storing the high-speed image data in a DRAM in real time comprises:
the high-speed image data are obtained based on a high-speed image sensor and are respectively stored in a first DRAM and a second DRAM, wherein the first DRAM is used for writing the high-speed image data, and the second DRAM is used for reading the high-speed image data.
3. The method of claim 1, wherein reading out the high-speed image data stored in the DRAM and transmitting the read out high-speed image data to a plurality of USB controllers according to a predetermined processing policy respectively comprises:
and writing data and reading data alternately by adopting a ping-pong architecture, and sequentially distributing the high-speed image data stored in the DRAM to a plurality of USB controllers according to the number of frames during reading.
4. The method of claim 3, wherein the sequentially distributing the high-speed image data stored in the DRAM to the plurality of USB controllers according to the number of frames during the reading comprises:
and transmitting the first frame of image to a first USB controller, transmitting the next frame of image to a second USB controller, and sequentially and circularly distributing the high-speed image data to a preset number of USB controllers.
5. The method of claim 3, wherein reading out the high-speed image data stored in the DRAM and transmitting the read out high-speed image data to a plurality of USB controllers according to a predetermined processing policy, respectively, further comprises:
and determining the distribution number of the USB controller according to the number of frames per second of the high-speed images to be recorded and the number of frames per second of processing of the USB controller.
6. The method of claim 1, wherein the compressing the high-speed video data based on the plurality of USB controllers comprises:
the USB controller compresses the high-speed image data into an h.264 format, and reduces the data volume to 1% -2%.
7. The method of claim 1, wherein transmitting the compressed data to a computer via a USB hub for storage comprises:
and determining the number of the USB hubs according to the number of the USB controllers, and respectively storing the compressed data in the plurality of USB controllers into a computer based on the USB hubs to correspondingly form a plurality of independent image data.
8. The method of claim 7, further comprising:
when a high-speed image needs to be played, decompressing and merging the independent image data based on preset software, forming a new image file after compression, and playing the image file.
9. The method according to claim 8, wherein the decompressing and merging the independent image data based on the predetermined software, forming a new image file after compression, and playing the image file comprises:
selecting one independent image data as a normal speed to play when playing the image, and selecting a time point needing to display the high-speed image in the playing process;
reading image data stored in the computer through preset software, and synthesizing a plurality of image data with preset duration before and after the time point into a new image file;
and playing and testing the image file through a player to obtain a slow motion image under high-speed shooting.
10. A video recording device of high-speed images is characterized by comprising an image controller, a DRAM, a USB controller, a USB concentrator and a computer, wherein the image controller is electrically connected with the DRAM, and the image controller, the USB concentrator and the computer are sequentially and electrically connected;
the image controller is used for acquiring high-speed image data and storing the high-speed image data in the DRAM in real time;
the image controller is also used for reading out the high-speed image data stored in the DRAM, respectively transmitting the high-speed image data to the plurality of USB controllers according to a preset processing strategy, and compressing the high-speed image data based on the plurality of USB controllers;
and the USB hub transmits the compressed data to the computer for storage.
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