CN110766718B - Picture acquisition method, device and system - Google Patents
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- CN110766718B CN110766718B CN201910849060.3A CN201910849060A CN110766718B CN 110766718 B CN110766718 B CN 110766718B CN 201910849060 A CN201910849060 A CN 201910849060A CN 110766718 B CN110766718 B CN 110766718B
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- 238000005070 sampling Methods 0.000 claims description 28
- 230000015654 memory Effects 0.000 claims description 23
- 238000004590 computer program Methods 0.000 claims description 8
- 238000010422 painting Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
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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 collecting pictures, wherein the method for collecting pictures comprises the following steps: the control equipment collects images of the target object at intervals, obtains drawing rate according to the difference between the first image and the second image, judges the relation between the drawing rate and the preset standard rate and makes corresponding adjustment, and the control equipment detects the drawing rate at the moment again at intervals to correspondingly adjust the photographing interval, so that a series of effective images can be obtained and transmitted to the server, and the problem that the drawing process cannot be automatically identified in the prior art under the condition of remote teaching so as to obtain the effective drawing images is solved.
Description
Technical Field
The invention relates to the field of digital image processing, in particular to a method, a device and a system for collecting pictures.
Background
With the rapid development of science and technology, people manufacture a plurality of electronic devices to facilitate the work and life of the people, and the development of communication wireless network technology, so that the goal of remote teaching can be realized, teachers and students can communicate with each other in different areas in time through a network, and network teaching is achieved.
The network painting teaching is one type of network teaching, a learner can shoot images through the camera equipment in the drawing process of the learner, so that the teacher can conveniently guide the whole drawing process through a network, and the problem is that the drawing speeds of different students are different, the collection frequency is fixed, and if the collection frequency is set too high, more collected pictures occupy more server space; if the collection frequency is too low, important drawing information cannot be collected by a student for drawing, and guidance of a teacher is not facilitated.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect of effective pictures in the dynamic process of acquisition in the prior art, thereby providing a method, a device and a system for acquiring pictures.
In view of this, the present invention provides a method for capturing pictures, comprising: acquiring images of a target object at intervals to obtain a first picture and a second picture; calculating the 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 greater than the preset standard rate, increasing the sampling frequency.
Optionally, in an embodiment, the method further comprises: and if the drawing rate is smaller than the preset standard rate, reducing the sampling frequency.
Optionally, in an embodiment, the method further comprises: acquiring the interval time of the first picture and the second picture; respectively extracting pixel points in a first picture and a second picture; calculating different pixel points in the first picture and the second picture; and calculating the painting speed according to the areas of the different pixel points and the interval time.
Alternatively, in one embodiment, the photographing interval is set to be in the 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 rate to the standard rate; and increasing the frequency value of the sampling frequency according to the ratio.
Optionally, in an embodiment, the method further comprises: if the drawing speed is smaller than the 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 collecting unit is used for collecting 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 pixel points on the acquired 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 a physical device for collecting the pictures, which comprises the following steps: the system comprises at least one processor and a memory in communication with the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the processor performs the method of capturing pictures by executing the instructions.
Correspondingly, the invention also provides a drawing image acquisition system, which comprises: the control device is used for executing the picture acquisition method, acquiring picture images appearing on the drawing board and adjusting the sampling frequency.
The invention also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of capturing pictures.
According to the method, the device, the system and the control equipment for collecting the pictures, the control equipment collects the images, calculates the drawing rate, judges whether the calculated real-time drawing rate is larger than the preset standard rate, calculates the ratio of the drawing rate to the standard rate when the drawing rate is larger than the preset standard rate, and accordingly improves the sampling frequency, so that the problem that effective drawing picture information cannot be extracted in the prior art is solved, and important drawing node images in the drawing process of students can be collected.
Similarly, when the real-time drawing speed is calculated to be smaller than the preset standard drawing speed, the ratio of the drawing speed to the standard speed is calculated, and the sampling frequency is correspondingly reduced, so that the problem that the control equipment always collects too many invalid pictures and occupies too much server space 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 that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for acquiring pictures 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 a virtual device for capturing pictures according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a physical device (control apparatus) 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 in an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the 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 should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Examples
The embodiment of the invention provides a method for collecting pictures, which is used for a control end in a collection system to collect a picture making process. The acquisition system comprises camera equipment and a control end, wherein the camera equipment is used for acquiring a drawing process of a student in online teaching of network drawing, the camera equipment acquires images of a target object (the drawing process of the student) 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, carries out pixel level identification on the two pictures, obtains a drawing area according to difference of the two pictures, then obtains a drawing rate, and the control end can adjust the sampling frequency of the camera equipment according to comparison of the obtained drawing rate and a preset standard rate, so that the photographing time interval is adjusted. In an embodiment, the transmission between the image capturing apparatus and the control terminal is wireless transmission, for example, a wireless communication module, such as a bluetooth module, a Wi-Fi module, may be installed on the image capturing apparatus and the control terminal, respectively, and then communicate through a set wireless communication protocol; or may be a wired transmission such as an optical cable or the like.
As shown in fig. 1, the method for capturing pictures is used in a control terminal, where the control terminal may be a separate control device or a controller that is disposed together with an image capturing device, and is used for controlling the image capturing device, and the method mainly includes:
Step S11: in a specific embodiment, the image capturing device captures images of the target object according to a preset capturing frequency, and the image capturing device captures images of the student during the drawing process. The image pickup 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 pictures of the target object acquired at intervals.
Step S12: comparing the difference of two adjacent pictures, and calculating the drawing rate; in this embodiment, after the image capturing apparatus acquires the first image and the second image, the two images are identified in pixel level, each pixel point on the images is extracted and distinguished, the total area of the difference between the pixel points on the two images is the total area of the monitored end, the interval time between the acquisition of the first image and the acquisition of the second image is obtained, and the drawing rate can be obtained according to the following calculation formula:
wherein S is the area of the drawing end for completing the image in a time interval, t is a specific numerical value of the time interval for collecting the image, and v is the drawing rate calculated according to a formula.
Step S13: judging whether the drawing rate is greater than a preset standard rate or not; in a specific embodiment, after obtaining the real-time drawing rate, the control end compares the drawing rate with the preset standard rate, if the drawing rate is greater than the preset standard rate, the time required for the target object to complete a drawing is shorter than the estimated time of the control end, so that the control end needs to make the sampling frequency of the image capturing device higher, and collect more pictures in a short time so as not to miss important drawing information images, namely, execute step S14; if the drawing rate is smaller than the preset standard rate, it indicates that the target object needs longer time to complete a drawing than the control end predicts, so the control end needs to make the sampling frequency of the image capturing device lower, collect fewer pictures, avoid collecting too many invalid pictures, occupy too much server memory space, and execute step S15.
Step S14: the control end increases the sampling frequency of the image capturing device, the image capturing device can collect more drawing images, in the embodiment, the control end firstly calculates the ratio of the drawing speed to the standard speed, and the frequency value of the sampling frequency is increased proportionally according to the calculated ratio.
Step S15: the control end reduces the sampling frequency of the image pickup device, collects fewer drawing images, and 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 proportionally according to the calculated ratio.
After the above steps are completed, as shown in fig. 2, the method for capturing pictures by the server is used in a control terminal, where the control terminal may be a separate control device or a controller that is disposed together with an image capturing device, and is used for controlling the image capturing device, and further includes:
Step S16: the control end transmits the acquired pictures to the server, and the step is to transmit the picture drawing process images to the background server or the teacher end, so that the picture drawing process images or the teacher can be conveniently stored to correct the picture drawing process.
The image acquisition process for the target object is completed by the camera equipment and the control end, the drawing speed of the target object is different, if the image is acquired at one sampling speed, the problem of too many or too few images can be avoided, the important drawing information can be missed when the image is acquired, and the drawing process can not be completely analyzed; too many pictures are collected, so that too many invalid pictures can appear, and the too large effect is not generated in the process of analyzing and drawing, so that too much server memory is occupied, and the user experience is affected.
The embodiment of the invention also provides a device for collecting pictures, as shown in fig. 3, which comprises:
The image collecting unit 31 is configured to collect images on the drawing board in real time to obtain a series of pictures, and details of implementation can be found in the related description of step S11 of the above method embodiment;
a calculating unit 32, configured to calculate a drawing rate according to the difference between the pixels on the collected adjacent pictures, and detailed implementation content can be seen from the related description of step S12 of the above method embodiment;
A comparison unit 33 for comparing the preset standard drawing rate and the calculated real-time drawing rate, and the detailed implementation content can be seen from the related description of step S13 of the above method embodiment;
The frequency adjusting unit 34 is used for adjusting the sampling frequency, and details of implementation can be found in the related description of step S14 and step S15 of the above method embodiment.
The device for collecting the pictures solves the problem of how to collect more effective pictures efficiently, simplifies the mode of collecting effective information in the drawing process, and reduces the probability of collecting ineffective pictures.
The invention also provides a device for collecting pictures, which is connected with the server and the control end, as shown in fig. 4, and comprises:
an image pickup apparatus 41; the method comprises the steps of acquiring a target object image;
A first communication module 411, configured to transmit data and transmit the collected target object image;
The first controller 412, connected to the first communication module 411, as shown in fig. 5, includes: 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 information, the at least one processor 51 executes the method for capturing pictures shown in fig. 2, and in fig. 5, one processor is taken as an example, and the processor 51 and the memory 52 are connected through the bus 50, where 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 used as a non-transitory computer readable storage medium for storing 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 application. The processor 51 executes various functional applications of the server and data processing, i.e., implements the picture taking method of the above-described method embodiment, by running non-transitory software programs, instructions, and units stored in the memory 52.
Memory 52 may include a storage program area that may store an operating system, at least one application program required for functionality, and a storage data area; the storage data area may store data created according to the use of a processing device operated by the server, or the like. In addition, 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, memory 52 may optionally include memory located remotely from processor 51, which may be connected to the 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 that, when executed by the one or more processors 51, perform the methods described in any of the above embodiments.
In the device provided by the embodiment of the invention, the first controller 412 collects the picture of the target object, and the first communication module 411 sends the collected picture to the control end. The problem that effective pictures in the drawing process cannot be acquired in the prior art is solved, and the real-time instruction of teachers to students in remote network teaching is facilitated.
The embodiment of the invention also provides a system for collecting pictures, as shown in fig. 6, the system comprises: the image capturing apparatus 62 is configured to execute the image capturing method described in any one of the above embodiments to start capturing an image of the target object 61 when the target object 61 starts to operate, the captured images are respectively referred to as a first image and a second image, at least two images are subjected to pixel-level discrimination in the image capturing apparatus 62, a drawing area is calculated according to the difference in pixel areas, a time interval for capturing the first image and the second image is acquired, and a drawing rate is obtained according to a ratio of the drawing area to the time interval; the control end 63 is further configured to perform the determining in the above embodiment 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 capturing the picture) according to the comparison result.
The virtual system for collecting the pictures solves the problems that too many invalid pictures are collected or important effective picture information is omitted when the sampling frequency is inappropriate in the process of collecting the pictures, achieves automatic adjustment of the sampling frequency aiming at the drawing process of students, collects more effective picture information and utilizes the memory space of a server to the greatest extent.
The embodiment of the invention also provides a non-transitory computer readable medium storing computer instructions for causing a computer to perform the method for capturing pictures described in any 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 (Random Access Memory, RAM), a flash memory (flash memory), a hard disk (HARD DISK DRIVE, abbreviated as HDD), a solid-state hard disk (solid-state-STATE DRIVE, SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (9)
1. A method of capturing pictures, comprising:
acquiring images of a target object acquired at intervals in a real-time shooting process 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;
If the drawing rate is greater than the preset standard rate, the sampling frequency is increased;
the step of calculating the drawing rate according to the difference between the first picture and the second picture comprises the following steps:
Acquiring the interval time of the first picture and the second picture;
respectively extracting pixel points in a first picture and a second picture;
calculating different pixel points in the first picture and the second picture;
and calculating the painting speed according to the areas of the different pixel points and the interval time.
2. A method of capturing pictures, comprising:
acquiring images of a target object at intervals in a real-time shooting process 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;
If the drawing rate is smaller than the preset standard rate, reducing the sampling frequency;
the step of calculating the drawing rate according to the difference between the first picture and the second picture comprises the following steps:
Acquiring the interval time of the first picture and the second picture;
respectively extracting pixel points in a first picture and a second picture;
calculating different pixel points in the first picture and the second picture;
and calculating the painting speed according to the areas of the different pixel points and the interval time.
3. A method according to claim 1 or 2, characterized in that the interval is set to 30 seconds to 1 minute.
4. The method of claim 1, wherein the step of increasing the sampling frequency if the drawing rate is greater than a preset standard rate 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.
5. The method of claim 2, 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.
6. An apparatus for capturing pictures, comprising:
the image collecting unit is used for collecting 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 pixel points on the acquired adjacent pictures;
The comparison unit is used for comparing the preset standard drawing rate with the calculated real-time drawing rate;
the frequency adjusting unit is used for adjusting the sampling frequency;
the computing unit is specifically configured to: acquiring the interval time of the first picture and the second picture; respectively extracting pixel points in a first picture and a second picture; calculating different pixel points in the first picture and the second picture; and calculating the painting speed according to the areas of the different pixel points and the interval time.
7. An apparatus for capturing 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 to perform the method of capturing pictures of any of claims 1-5 by executing the instructions.
8. A pictorial image acquisition system, comprising:
At least one control device and a drawing board, the control device being adapted to perform the method of capturing pictures as claimed in any of claims 1-5, capturing drawing images appearing on the drawing board, adjusting the sampling frequency and transmitting the captured pictures.
9. A computer readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, implements a method of taking pictures according to any one of claims 1-5.
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