CN110766718A - Method, device and system for acquiring picture - Google Patents
Method, device and system for acquiring picture Download PDFInfo
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- CN110766718A CN110766718A CN201910849060.3A CN201910849060A CN110766718A CN 110766718 A CN110766718 A CN 110766718A CN 201910849060 A CN201910849060 A CN 201910849060A CN 110766718 A CN110766718 A CN 110766718A
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000005070 sampling Methods 0.000 claims description 27
- 230000015654 memory Effects 0.000 claims description 22
- 238000004590 computer program Methods 0.000 claims description 8
- 238000004891 communication Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 10
- 238000012545 processing Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 238000007591 painting process Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000004458 analytical method Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/20—Analysis of motion
- G06T7/246—Analysis of motion using feature-based methods, e.g. the tracking of corners or segments
- G06T7/248—Analysis of motion using feature-based methods, e.g. the tracking of corners or segments involving reference images or patches
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/60—Analysis of geometric attributes
- G06T7/62—Analysis of geometric attributes of area, perimeter, diameter or volume
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
- H04N23/661—Transmitting camera control signals through networks, e.g. control via the Internet
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10141—Special mode during image acquisition
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Abstract
A method, a device and a system for acquiring pictures are provided, wherein the method for acquiring pictures comprises the following steps: the control equipment collects images of a target object at intervals, drawing speed is obtained according to the difference between a first picture and a second picture, the relation between the drawing speed and a preset standard speed is judged, corresponding adjustment is made, the control equipment can detect the drawing speed at the moment again at intervals to correspondingly adjust the photographing interval, and therefore a series of effective images can be obtained and transmitted to the server.
Description
Technical Field
The invention relates to the field of digital image processing, in particular to a method, a device and a system for acquiring pictures.
Background
With the rapid development of scientific technology, people make a plurality of electronic devices to facilitate work and life of people, and the development of communication wireless network technology realizes the aim of remote teaching, teachers and students can communicate with each other in different areas in time through the network, and the network teaching is produced at the end of life.
The network drawing teaching is one type of network teaching, students can shoot images in the drawing process through camera equipment, and teachers can conveniently guide the whole drawing process through a network; if the collection frequency is too low, important drawing information cannot be collected for the fast-drawing student, and the guidance of a teacher is not facilitated.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect of the prior art in acquiring an effective picture in a dynamic process, thereby providing a method, an apparatus and a system for acquiring a picture.
In view of the above, the present invention provides a method for acquiring a picture, including: acquiring images of a target object at intervals to obtain a first picture and a second picture; calculating a drawing rate according to the difference between the first picture and the second picture; comparing the drawing rate with a preset standard rate; and if the drawing speed is greater than the preset standard speed, increasing the sampling frequency.
Optionally, in an embodiment, the method further includes: and if the drawing rate is less than the preset standard rate, reducing the sampling frequency.
Optionally, in an embodiment, the method further includes: acquiring the interval time between the acquisition of the first picture and the acquisition of the second picture; respectively extracting pixel points in the first picture and the second picture; calculating different pixel points in the first picture and the second picture; and calculating drawing speed according to the areas of the different pixel points and the interval time.
Alternatively, in one embodiment, the photographing interval is set in a range of 30 seconds to 1 minute.
Optionally, in an embodiment, if the drawing rate is greater than a preset standard rate, calculating a ratio of the drawing speed to the standard speed; and increasing the frequency value of the sampling frequency according to the ratio.
Optionally, in an embodiment, the method further includes: if the drawing speed is less than a preset standard speed, calculating the ratio of the drawing speed to the standard speed; and reducing the frequency value of the sampling frequency according to the ratio.
Correspondingly, the invention also provides a virtual device for collecting pictures, which comprises: the image acquisition unit is used for acquiring images on the drawing board in real time to obtain a series of pictures; the calculating unit is used for calculating the drawing rate according to the difference of the collected pixel points on the adjacent pictures; the comparison unit is used for comparing the preset standard drawing rate with the calculated real-time drawing rate; and the frequency adjusting unit is used for adjusting the sampling frequency.
Correspondingly, the invention also provides an entity device for collecting the picture, which comprises: the image processing device comprises at least one processor and a memory which is connected with the at least one processor in a communication mode, wherein the memory stores instructions which can be executed by the at least one processor, and the processor executes the instructions so as to execute the method for acquiring the pictures.
Correspondingly, the invention also provides a painting image acquisition system, which comprises: the control device is used for executing the picture acquisition method, acquiring the drawing images appearing on the drawing board and adjusting the sampling frequency.
The invention also provides a computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the steps of capturing pictures.
The method, the device, the system and the control equipment for acquiring the picture provided by the invention are used for acquiring the picture through the control equipment, calculating the drawing speed, judging whether the calculated real-time drawing speed is greater than the preset standard speed or not, and calculating the ratio of the drawing speed to the standard speed when the drawing speed is greater than the preset standard speed, so that the sampling frequency is correspondingly improved, the problem that effective drawing picture information cannot be extracted in the prior art is solved, and the important drawing node image in the drawing process of students can be acquired.
Similarly, when the calculated real-time drawing rate is smaller than the preset standard drawing rate, the ratio of the drawing rate to the standard speed is calculated, and accordingly the sampling frequency is reduced, so that the problem that too many invalid pictures are collected by the control equipment all the time and too much server space is occupied in the drawing process is solved.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flowchart illustrating a method for determining a drawing rate according to an embodiment of the present invention;
fig. 2 is a flowchart of a specific example of a method for capturing pictures according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of a specific example of an apparatus for virtually capturing pictures according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a physical apparatus (control device) according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a first controller in a physical device according to an embodiment of the present invention;
fig. 6 is a schematic block diagram of a specific example of a system for capturing pictures according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Examples
The embodiment of the invention provides a method for acquiring pictures, which is used for a control end in an acquisition system to acquire a drawing process. The acquisition system comprises camera equipment and a control end, wherein the camera equipment is used for acquiring the drawing process of students in online network drawing teaching, the camera equipment acquires images of a target object (the drawing process of the students) at intervals to obtain a first picture and a second picture, the control end obtains the first picture and the second picture acquired by the camera equipment, pixel-level identification is carried out on the two pictures, the drawing area is obtained according to the difference of the two pictures, then the drawing speed is obtained, the control end can adjust the sampling frequency of the camera equipment according to the comparison of the obtained drawing speed and a preset standard speed, and the photographing time interval is adjusted. In an embodiment, the transmission between the image capturing device and the control end is wireless transmission, for example, wireless communication modules, such as a bluetooth module and a Wi-Fi module, may be respectively installed on the image capturing device and the control end, and then communicate through a set wireless communication protocol; and may also be a wired transmission such as a fiber optic cable or the like.
As shown in fig. 1, the method for capturing pictures is used in a control end, where the control end may be a separate control device or a controller that is provided with an image capturing device, and is used to control the image capturing device and preset a capturing frequency of the image capturing device, and the method mainly includes:
step S11: the method includes the steps that images of a target object are acquired at intervals, in a specific embodiment, the image pickup device acquires the images of the target object according to a preset acquisition frequency, and in the drawing process of students, the image pickup device acquires the drawing process of the students. The camera device monitors the drawing process of the target object in real time and sends the images to the control end, so that the control end can acquire the images of the target object acquired at intervals.
Step S12: comparing the difference between two adjacent pictures, and calculating the drawing speed; in this embodiment, after the camera device acquires the first picture and the second picture, the two pictures are identified at a pixel level, each pixel point on the pictures is extracted and distinguished, the total area of the pixel points on the two pictures is the total area of the monitored end drawing, the interval time between the acquisition of the first picture and the acquisition of the second picture is obtained, and the drawing rate can be obtained according to the following calculation formula:
wherein S is the area of the finished image of the drawing end in a time interval, t is the specific numerical value of the time interval for collecting the image, and v is the drawing speed calculated according to a formula.
Step S13: judging whether the drawing speed is greater than a preset standard speed or not; in a specific embodiment, after the real-time drawing rate is obtained, the control end compares the drawing rate with a preset standard rate, and if the drawing rate is greater than the preset standard rate, it indicates that the time required by the target object to finish one drawing is shorter than the time estimated by the control end, so that the control end needs to make the sampling frequency of the camera device higher, collect more pictures in a short time, so as to avoid missing important drawing information images, that is, execute step S14; if the drawing rate is less than the preset standard rate, it is indicated that the time required for the target object to complete one drawing is longer than the time estimated by the control end, so that the control end needs to make the sampling frequency of the camera device lower, collect fewer pictures, avoid collecting too many invalid pictures and occupy too much memory space of the server, and then execute step S15.
Step S14: the control end improves the sampling frequency of the camera equipment, and the camera equipment can collect more drawing images.
Step S15: the control end reduces the sampling frequency of the camera equipment and collects fewer drawing images, in the embodiment, the control end firstly calculates the ratio of the drawing speed to the standard speed, and reduces the frequency value of the sampling frequency according to the calculated ratio in proportion.
After the above steps are completed, as shown in fig. 2, the method for acquiring a picture by a server is used in a control end, where the control end may be a separate control device or a controller disposed together with an image capturing device, and is used to control the image capturing device, and further includes:
step S16: the control end transmits the collected pictures to the server, and the step is to send the painting process images to the background server or the teacher end, so that the painting process images can be conveniently stored or the teacher can modify the painting process.
The picture collecting method of the embodiment of the invention is an image collecting process aiming at a target object, which is completed by a camera device and a control terminal together, the drawing speed of the target object is different, if only one sampling speed is used for collecting pictures, the problem of collecting too many or too few pictures is inevitable, the collected pictures are too few, important drawing information is leaked, and the drawing process cannot be completely analyzed; too many collected pictures can generate too many invalid pictures, so that the analysis and drawing process is not greatly influenced, too many server memories are occupied, and the user experience is influenced.
An embodiment of the present invention further provides a device for collecting a picture, as shown in fig. 3, including:
the image collecting unit 31 is configured to collect images on the drawing board in real time to obtain a series of pictures, and the detailed implementation contents may be referred to the related description of step S11 in the above method embodiment;
the calculating unit 32 is configured to calculate a drawing rate according to the difference between the collected pixel points on the adjacent pictures, and the detailed implementation contents can be referred to the related description of step S12 in the above method embodiment;
a comparing unit 33, configured to compare the preset standard drawing rate with the calculated real-time drawing rate, for details, see the related description of step S13 in the above method embodiment;
the details of the frequency adjusting unit 34 for adjusting the sampling frequency can be found in the related description of step S14 and step S15 of the above method embodiment.
The device for acquiring the pictures solves the problem of how to efficiently acquire more effective pictures, simplifies the mode of acquiring effective information in the drawing process, and reduces the probability of acquiring invalid pictures.
The present invention further provides a device for collecting pictures, wherein the device is connected to a server and a control terminal, as shown in fig. 4, and comprises:
an image pickup apparatus 41; used for collecting the target object image;
the first communication module 411 is used for transmitting data and transmitting the acquired target object image;
a first controller 412 connected to the first communication module 411, as shown in fig. 5, including: at least one processor 51; and a memory 52 communicatively coupled to the at least one processor 51; the memory 52 stores instructions executable by the at least one processor 51, and when receiving the start-up information, the at least one processor 51 is enabled to execute the method for capturing pictures shown in fig. 2, in fig. 5, taking one processor as an example, the processor 51 and the memory 52 are connected by a bus 50, in this embodiment, the first communication module may be a wireless communication module, for example, a bluetooth module, a Wi-Fi module, or a wired communication module.
The memory 52 is a non-transitory computer readable storage medium, and can be used to store non-transitory software programs, non-transitory computer executable programs, and units, such as program instructions/units corresponding to the method for capturing pictures in the embodiment of the present application. The processor 51 executes various functional applications of the server and data processing by running non-transitory software programs, instructions and units stored in the memory 52, that is, implements the method for capturing pictures of the above-described method embodiment.
The memory 52 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of a processing device operated by the server, and the like. Further, the memory 52 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 52 may optionally include memory located remotely from the processor 51, which may be connected to a network connection device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
One or more modules are stored in the memory 52 and, when executed by the one or more processors 51, perform the method described in any of the above embodiments.
In the apparatus provided by the embodiment of the present invention, the first controller 412 acquires the picture of the target object, and the first communication module 411 sends the acquired picture to the control end. The problem of unable collection drawing process effective picture under the prior art is solved, be favorable to the teacher to the real-time guidance of student's drawing in remote network teaching.
An embodiment of the present invention further provides a system for acquiring pictures, as shown in fig. 6, the system includes: when the target object 61 starts to work, the image capturing device 62 is configured to execute the method for capturing images described in any of the embodiments, start to capture an image of the target object 61, where the captured images are respectively referred to as a first image and a second image, distinguish at least two images in the image capturing device 62 at a pixel level, calculate a drawing area according to the difference of the pixel areas, obtain a time interval for capturing the first image and the second image, and obtain a drawing rate according to a ratio of the drawing area to the time interval; the control terminal 63 is further configured to determine whether the calculated drawing rate is greater than the preset standard rate, and adjust the sampling frequency (in this embodiment, the time interval for acquiring the pictures) according to the comparison result.
The virtual system for acquiring the pictures solves the problem that in the picture acquisition process, when the sampling frequency is inappropriate, too many invalid pictures are acquired or important effective picture information is omitted, realizes the drawing process for students, automatically adjusts the sampling frequency, acquires more effective picture information, and maximally utilizes the memory space of a server.
The embodiment of the present invention further provides a non-transitory computer readable medium, where the non-transitory computer readable storage medium stores a computer instruction, and the computer instruction is used to enable a computer to execute the method for acquiring a picture described in any one of the above embodiments, where the storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard disk (Hard disk Drive, abbreviated as HDD), or a Solid-State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A method of capturing pictures, comprising:
acquiring images of a target object acquired at intervals to obtain a first picture and a second picture;
calculating a drawing rate according to the difference between the first picture and the second picture;
comparing the drawing rate with a preset standard rate;
and if the drawing speed is greater than the preset standard speed, increasing the sampling frequency.
2. A method of capturing pictures, comprising:
acquiring images of a target object at intervals to obtain a first picture and a second picture;
calculating a drawing rate according to the difference between the first picture and the second picture;
comparing the drawing rate with a preset standard rate;
and if the drawing rate is less than the preset standard rate, reducing the sampling frequency.
3. The method of claim 1 or 2, wherein the step of calculating the drawing rate based on the difference between the first picture and the second picture comprises:
acquiring the interval time between the acquisition of the first picture and the acquisition of the second picture;
respectively extracting pixel points in the first picture and the second picture;
calculating different pixel points in the first picture and the second picture;
and calculating drawing speed according to the areas of the different pixel points and the interval time.
4. The method of claim 3, wherein the interval time is set to 30 seconds to 1 minute.
5. The method of claim 1, 2 or 4, wherein if the drawing rate is greater than a predetermined standard rate, the step of increasing the sampling frequency comprises:
calculating the ratio of the drawing speed to the standard speed;
and increasing the frequency value of the sampling frequency according to the ratio.
6. The method according to claim 2 or 4, wherein the step of reducing the sampling frequency if the drawing rate is less than a preset standard rate comprises:
calculating the ratio of the drawing speed to the standard speed;
and reducing the frequency value of the sampling frequency according to the ratio.
7. A virtual device for capturing pictures, comprising:
the image acquisition unit is used for acquiring images on the drawing board in real time to obtain a series of pictures;
the calculating unit is used for calculating the drawing rate according to the difference of the collected pixel points on the adjacent pictures;
the comparison unit is used for comparing the preset standard drawing rate with the calculated real-time drawing rate;
and the frequency adjusting unit is used for adjusting the sampling frequency.
8. An entity device for acquiring pictures, comprising:
at least one processor and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the processor executes the instructions to perform the method of capturing pictures according to any one of claims 1-6.
9. A system for capturing a pictorial image, comprising:
at least one control device and a drawing board, wherein the control device is used for executing the picture acquisition method according to any one of claims 1-6, acquiring the drawing image appearing on the drawing board, adjusting the sampling frequency and transmitting the acquired picture.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the step of capturing pictures according to any one of claims 1 to 6.
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