CN111225197A - Projection method, device, equipment and readable storage medium - Google Patents
Projection method, device, equipment and readable storage medium Download PDFInfo
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- CN111225197A CN111225197A CN201911191578.9A CN201911191578A CN111225197A CN 111225197 A CN111225197 A CN 111225197A CN 201911191578 A CN201911191578 A CN 201911191578A CN 111225197 A CN111225197 A CN 111225197A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/16—Human faces, e.g. facial parts, sketches or expressions
- G06V40/161—Detection; Localisation; Normalisation
- G06V40/165—Detection; Localisation; Normalisation using facial parts and geometric relationships
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3155—Modulator illumination systems for controlling the light source
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Abstract
The application discloses a projection method: whether dangerous behaviors that children turn visual angles to projection light sources exist in a projection area or not is monitored through a camera, when the dangerous behaviors are found, a spare projection area without children is selected in an observation area (a large-visual-angle fish-eye lens can observe a larger area) which is observed by a fish-eye lens in advance and contains the current projection area, the children are avoided by adjusting the projection area to the spare projection area, strong light can be effectively prevented from continuously emitting to the eyes of the children, and irreversible damage to the eyes of the children is prevented. The application also discloses a projection device, equipment and a readable storage medium, which have the beneficial effects.
Description
Technical Field
The present application relates to the field of projection technologies, and in particular, to a projection method, an apparatus, a device, and a readable storage medium.
Background
Various projection devices greatly expand the display mode of images, and compared with the traditional display, the projection device has the advantages of adjustable display size, low cost, flexible transition and the like through a projection mode.
The projection device shines outwardly through a projection light source (typically a dedicated light bulb) to present a visual image on a satisfactory wall surface or a dedicated projection screen. Because the projection device needs to emit strong light continuously from the projection light source when working, a light path is formed between the emitting point and the receiving position. And along with the change of the actual projection content, the light path also presents a colorful color, and is easy to attract some children to watch.
Children are easily trying to look directly at the projection light source driven by curiosity, and the intensity emitted by the projection light source will cause irreversible damage to the eyes of the children who are still in development, even blindness, by being directly projected into the eyes of the children.
Therefore, how to protect the eyes of children who are curiously driven to look directly at the projection light source is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
It is an object of the present application to provide a projection method, apparatus, device and readable storage medium aimed at better protecting the eyes of children who are curiosity to drive direct view of a projection light source.
To achieve the above object, the present application provides a projection method, including:
utilizing a camera to shoot to obtain a monitoring image of a projection area;
judging whether dangerous behaviors that the children turn the visual angle to the projection light source exist or not according to the monitoring image;
if the dangerous behaviors exist, determining an alternative projection area without children in an observation area observed by the fisheye lens, and adjusting the current projection area to the alternative projection area; and the projection area corresponding to the projection light source is contained in the observation area corresponding to the fisheye lens.
Optionally, judge whether there is the dangerous behavior that children turned the viewing angle to the projection light source according to the monitoring image, include:
judging whether the monitoring image contains a face image or not;
if the child face image contains the face image, judging whether the child face image is a child face according to the face features of the face image;
and if the human face is the child face, judging that dangerous behaviors that the child turns the visual angle to the projection light source exist.
Optionally, determining whether the face image is a child face according to the facial features of the face image includes:
extracting an actual pupil distance and/or an actual face size from the face image;
according to whether the actual pupil distance and/or the actual face size are/is in a preset pupil distance range of the child and/or a preset face size range of the child;
and if the actual pupil distance and/or the actual face size are/is in a preset pupil distance range of the child and/or a preset face size range of the child, judging that the child faces.
Optionally, determining, in an observation region observed by the fisheye lens, that there is no candidate projection region of the child, including:
and selecting a partial area, which does not have the face of the child in the observation area and has the size consistent with that of the current projection area, as the alternative projection area by using the camera.
Optionally, after adjusting the current projection region to the candidate projection region, the method further includes:
and performing clipping and anti-distortion processing on the image projected to the alternative projection area.
Optionally, adjusting the current projection region to the alternative projection region includes:
calculating to obtain the relative position relation between the alternative projection area and the current projection area;
and controlling a projection light source motor to drive the projection light source to rotate by a corresponding angle according to the relative position relation so as to adjust the current projection area to the alternative projection area.
Optionally, before determining that there is no candidate projection region of the child in the observation region observed by the fisheye lens, the method further includes:
reducing the light intensity of the projection light source, and counting to obtain the duration of the dangerous behaviors;
and when the duration exceeds a preset duration, executing the step of determining that the alternative projection area of the child does not exist in the observation area observed by the fisheye lens.
To achieve the above object, the present application also provides a projection apparatus, comprising:
the monitoring image shooting unit is used for shooting by utilizing a camera to obtain a monitoring image of a projection area;
the dangerous behavior existence judging unit is used for judging whether dangerous behaviors that children turn the view angle to the projection light source exist or not according to the monitoring image;
the projection area adjusting unit is used for determining an alternative projection area without children in an observation area observed by the fisheye lens when the dangerous behaviors exist, and adjusting the current projection area to the alternative projection area; and the projection area corresponding to the projection light source is contained in the observation area corresponding to the fisheye lens.
Optionally, the dangerous behavior existence judging unit includes:
the face image comprises a judging subunit, which is used for judging whether the monitoring image comprises a face image;
the child face judgment subunit is used for judging whether the child face is the child face or not according to the facial features of the face image when the child face image is included;
and the dangerous behavior existence judging subunit is used for judging that dangerous behaviors of turning the visual angle to the projection light source by the children exist when the faces of the children are the faces of the children.
Optionally, the child face judgment subunit includes:
the pupil distance and/or face size extraction module is used for extracting and obtaining the actual pupil distance and/or the actual face size from the face image;
the pupil distance and/or face size judging module is used for judging whether the actual pupil distance and/or the actual face size are within a preset pupil distance range of the child and/or a preset face size range of the child according to the actual pupil distance and/or the actual face size;
and the child face judgment module is used for judging the child face when the actual pupil distance and/or the actual face size are within a preset pupil distance range of the child and/or a preset face size range of the child.
Optionally, the projection area adjusting unit includes:
and the alternative projection area determining subunit is configured to select, by using the camera, a partial area, of the observation area, where the child face does not exist and the size of the partial area is consistent with that of the current projection area, as the alternative projection area.
Optionally, the projection apparatus further includes:
and after the current projection area is adjusted to the alternative projection area, clipping and anti-distortion processing is carried out on the image projected to the alternative projection area.
Optionally, the projection area adjusting unit includes:
the relative position relation calculating subunit is used for calculating to obtain a relative position relation between the candidate projection area and the current projection area;
and the motor control subunit is used for controlling a projection light source motor to drive the projection light source to rotate by a corresponding angle according to the relative position relationship so as to adjust the current projection area to the alternative projection area.
Optionally, the projection apparatus further includes:
the light intensity reducing and duration counting unit is used for reducing the light intensity of the projection light source before determining that no children's alternative projection area exists in the observation area observed by the fisheye lens, and counting to obtain the duration of the dangerous behaviors;
and the timeout processing unit is used for executing the determination of the alternative projection area without the child in the observation area observed by the fisheye lens when the duration exceeds the preset duration.
To achieve the above object, the present application also provides a projection apparatus, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the projection method as described in the above when executing the computer program.
To achieve the above object, the present application also provides a readable storage medium having stored thereon a computer program which, when being executed by a processor, realizes the steps of the projection method as described above.
The application provides a projection method, which comprises the following steps: utilizing a camera to shoot to obtain a monitoring image of a projection area; judging whether dangerous behaviors that the children turn the visual angle to the projection light source exist or not according to the monitoring image; if the dangerous behaviors exist, determining an alternative projection area without children in an observation area observed by the fisheye lens, and adjusting the current projection area to the alternative projection area; and the projection area corresponding to the projection light source is contained in the observation area corresponding to the fisheye lens.
According to the projection method provided by the application, whether dangerous behaviors that children turn visual angles to projection light sources exist in a projection area or not is monitored through a camera, when the dangerous behaviors are found, in an observation area which is observed by a fish-eye lens in advance and contains a current projection area (the fish-eye lens with a large visual angle can observe a larger area), a spare projection area without children is selected, the children are avoided by adjusting the projection area to the spare projection area, strong light can be effectively prevented from continuously irradiating the eyes of the children, and irreversible damage to the eyes of the children is prevented.
The application also provides a projection device, equipment and a readable storage medium, which have the beneficial effects and are not repeated herein.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a projection method according to an embodiment of the present disclosure;
fig. 2 is a flowchart of another projection method provided in an embodiment of the present application;
fig. 3 is a flowchart of a method for adjusting a current projection area to an alternative projection area in a projection method provided in an embodiment of the present application;
fig. 4 is a flowchart of another projection method provided in an embodiment of the present application;
fig. 5 is a front view of a cabinet type projection apparatus provided in an embodiment of the present application;
fig. 6 is a side view of a cabinet type projection apparatus according to an embodiment of the present application;
fig. 7 is a front view of a projection picture of a cabinet type projection apparatus according to an embodiment of the present disclosure;
fig. 8 is a block diagram of a projection apparatus according to an embodiment of the present disclosure.
Detailed Description
It is an object of the present application to provide a projection method, apparatus, device and readable storage medium aimed at better protecting the eyes of children who are curiosity to drive direct view of a projection light source.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. 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 application.
It should be noted that the executing bodies of the steps in the following embodiments of the present application are all projection devices with a projection function, and can be embodied as various projectors for exclusive use and projection, and various intelligent terminals with a projection function.
Referring to fig. 1, fig. 1 is a flowchart of a projection method according to an embodiment of the present disclosure, which includes the following steps:
s101: utilizing a camera to shoot to obtain a monitoring image of a projection area;
the projection area is an area where strong light emitted by the projection light source is finally presented as a visual picture, and the projection area can be a certain area on a wall surface or a certain area on a special projection curtain. The projection area that the projection light source corresponds contains in the monitoring area that the camera corresponds, and the camera can monitor wider region promptly. The present application does not limit the position where the camera is installed, as long as the camera can achieve the above object. Preferably, the projection device may be provided at a position near the same plane as the projection light source on the projection device.
This step is intended to obtain a monitoring image of the projection area by means of a camera in order to determine whether there is a dangerous behavior of the child turning the angle of view to the projection light source based on an analysis of the monitoring image.
S102: judging whether dangerous behaviors that the child turns the view angle to the projection light source exist or not according to the monitoring image, if so, executing S104, and if not, executing S103;
on the basis of S101, the present step is to determine whether there is a dangerous behavior that the child turns the angle of view to the projection light source or whether there is a dangerous behavior that the child looks directly at the projection light source according to the image features included in the monitored video.
Since the monitoring image is the image content captured by the camera in the projection area, the purpose of determining whether the dangerous behavior exists should be achieved based on whether the monitoring image includes the image feature capable of representing the dangerous behavior. Because the present application is directed to determining whether there is a child's behavior of turning the viewing angle to the projection light source, two key points are included: children and viewing angles are turned to the projection light source, so the center of gravity should be judged in the step for finding image features capable of reflecting the two points.
Wherein, whether the child is a child can be judged through physical characteristics such as body type, height, motion characteristics and the like and facial characteristics such as pupil distance, face size and the like; whether the angle of view turns to this projection light source, then can be according to must look directly at the projection light source when turning to the projection light source with the angle of view, and then lead to the camera to shoot the characteristic that contains complete face information (commonly known as the face image), judge based on these information that can acquire.
On this basis, the application provides a preferred implementation mode according to the analysis of the image feature types capable of embodying the two key points, namely, the implementation mode is realized by selecting the facial features capable of embodying the two key points at the same time. The method specifically comprises the following steps (see fig. 2 in combination with the following detailed flowchart of the implementation):
judging whether the monitoring image contains a face image or not;
if the child face image contains the face image, judging whether the child face image is a child face according to the face features of the face image;
if the human face is the child face, it is judged that a dangerous behavior that the child turns the view angle to the projection light source exists.
It can be seen that, on the basis of achieving the purpose of judgment only through facial features, the preferred implementation scheme includes two steps, that is, whether a face image exists is judged firstly, and if the face image does not exist, it is indicated that even if a child is located in front of the projection light source, it is inferred that the child does not try to look directly at the projection light source because the face image cannot be shot, and the child is likely to pass through the front of the projection light source only in the running or action process. In this case, subsequent judgment is not needed, and only the judgment of whether the face image exists needs to be carried out only by analyzing the image with less calculation amount; if the face image exists, the fact that a person tries to directly view the projection light source is indicated, and at the moment, further detail judgment is conducted to judge whether the face image is a child face.
Furthermore, the facial features can still be subdivided into a plurality of sub-items, such as facial features, facial size, skin color features, and the like, and the application provides a specific implementation scheme for some representative features which can be obviously embodied in the faces of children:
extracting an actual pupil distance and/or an actual face size from the face image;
whether the actual pupil distance and/or the actual face size are within a preset pupil distance range of the child and/or a preset face size range of the child is/are judged;
and if the actual pupil distance and/or the actual face size are/is within the preset pupil distance range and/or the preset face size range of the child, determining that the child faces.
The purpose of judging whether the face of the child is achieved through the pupil distance and the face size which can be obviously distinguished to be adults or children is achieved, and the scheme comprises three parallel sub-schemes:
firstly, a judgment conclusion is obtained only by utilizing a comparison result between the actual pupil distance and a preset pupil distance range of the child;
secondly, a judgment conclusion is obtained only by utilizing a comparison result between the actual face size and a preset child face size range;
and thirdly, combining two criteria to obtain a more accurate judgment conclusion by utilizing a comparison result between the actual pupil distance and the preset pupil distance range of the child and a comparison result between the actual face size and the preset face size range of the child.
The specific selection is flexibly selected according to the requirement on the judgment accuracy in the actual application scene, and is not particularly limited here.
S103: no operation is performed;
this step is based on the determination result of S102 being that there is no dangerous behavior of the child turning the viewing angle to the projection light source, and therefore, there is no need to adjust the working mode of the current projection apparatus, and the operation is left as it is.
S104: and determining an alternative projection area without children in an observation area observed by the fisheye lens, and adjusting the current projection area to the alternative projection area.
Wherein, the fisheye lens is an ultra-wide angle lens, and the maximum visual angle can be as wide as 180 degrees. Therefore, based on the characteristics of the fisheye lens, at the same observation point, the fisheye lens can be used for obtaining an observation area with a range much larger than that of a common lens, namely, the projection area corresponding to the projection light source is included in the observation area corresponding to the fisheye lens. The purpose of selecting the alternative projection area is achieved by using the characteristic of the fisheye lens.
The step is based on the judgment result of S02 that there is a dangerous behavior that the child turns the viewing angle to the projection light source, so in order to reduce the damage to the eyes of the child as much as possible, the step first determines an alternative projection area where the child does not exist in the observation area observed by the fisheye lens, and after the alternative projection area is selected, the current projection area is actively projected again in a manner of adjusting the alternative projection area, thereby achieving the purpose of the present application.
It should be understood that the candidate projection area is preferably the same as the current projection area in size, and the projection effect is preferably ensured, of course, if the practical situation does not allow the candidate projection area to be scaled down appropriately, and the selection condition of the candidate projection area is reduced (for example, the influence of the existence of tiny obstacles or unevenness on the wall surface on the imaging effect may be allowed).
Specifically, the replacement of the projection area can be realized in multiple ways, and can be simply divided into two categories, namely, the projection area is distinguished according to whether the projection equipment body is moved, and if the projection equipment body is moved, the projection angle corresponding to the projection light source is not changed; if the projection equipment body is not moved, the projection can be realized only by adjusting the projection angle of the projection light source.
In order to provide better user experience and to consider the accuracy and inconvenience of manually moving the projection device body, the application provides an implementation manner of adjusting the projection angle of the projection light source through fig. 3, which includes the following steps:
s301: calculating to obtain the relative position relation between the alternative projection area and the current projection area;
s302: and controlling a projection light source motor to drive the projection light source to rotate by a corresponding angle according to the relative position relation so as to adjust the current projection area to the alternative projection area.
It can be seen that, in this implementation manner, a projection light source motor capable of driving the projection light source to adjust the angle is disposed near the projection light source of the projection device, and the calculated relative position relationship is input to the projection light source motor as a control parameter, so that the replacement of the projection area can be implemented.
However, the method of adjusting the projection angle of the projection light source may cause imaging distortion to a certain extent, and therefore, it is also necessary to perform clipping and inverse distortion processing on the image projected to the candidate projection area after the method is adopted, so as to recover the image to normal as much as possible.
According to the projection method provided by the embodiment, whether dangerous behaviors that children turn the view angle to the projection light source exist in the projection area is monitored through the camera, when the dangerous behaviors are found, in the observation area which is observed by the fisheye lens in advance and contains the current projection area (the fisheye lens with the large view angle can observe a larger area), an alternative projection area without children is selected, the children are avoided by adjusting the projection area to the alternative projection area, strong light can be effectively prevented from continuously irradiating the eyes of the children, and irreversible damage to the eyes of the children is prevented.
On the basis of the above-described embodiment, it is obviously not necessary for the child to change the projection area according to the above-described scheme, in view of the fact that the child may be actively stopped by eye stimulation shortly after attempting to look directly at the projection light source. This corresponds to the child achieving the same object that can be achieved by the projection device by changing the projection area by means of an active detachment, which of course does not have to continue to follow the original solution on the basis of the object that has already been achieved.
For this situation, the present application adds an additional step of determining based on the above embodiment, please refer to the flowchart shown in fig. 4:
s401: utilizing a camera to shoot to obtain a monitoring image of a projection area;
s402: judging whether dangerous behaviors that the child turns the view angle to the projection light source exist or not according to the monitoring image, if so, executing S403, and otherwise, executing S405;
s403: reducing the light intensity of the projection light source, and counting to obtain the duration of dangerous behaviors;
in this step, on the basis that the judgment result of S402 is that there is a dangerous behavior in which the child turns the angle of view to the projection light source, the light intensity of the projection light source is first reduced, and the duration of the dangerous behavior is obtained by statistics.
S404: judging whether the duration exceeds a preset duration, if so, executing S406, and otherwise, executing S405;
the preset time period may be set to 3 seconds in consideration of the actual situation.
S405: no operation is performed;
s406: and determining an alternative projection area without children in an observation area observed by the fisheye lens, and adjusting the current projection area to the alternative projection area.
As shown in fig. 4, in the embodiment, firstly, the damage to the eyes of the child is weakened as much as possible by reducing the light intensity of the projection light source, and whether the child performs the active avoidance operation is determined by comparing the duration with the preset duration, and the projection area is moved only when the active avoidance operation is not performed.
Because the situation is complicated and cannot be illustrated by a list, a person skilled in the art can realize that many examples exist according to the basic method principle provided by the application and the practical situation, and the protection scope of the application should be protected without enough inventive work.
Referring to fig. 5, fig. 5 is a block diagram illustrating a configuration of a deployment system of a service in a cloud environment according to an embodiment of the present disclosure, where the deployment system may include:
a monitoring image shooting unit 100, configured to obtain a monitoring image of a projection area through shooting with a camera;
a dangerous behavior existence judging unit 200, configured to judge whether a dangerous behavior that the child turns the viewing angle to the projection light source exists according to the monitoring image;
a projection area adjusting unit 300, configured to determine, when the dangerous behavior exists, an alternative projection area where no child exists in an observation area observed by a fisheye lens, and adjust a current projection area to the alternative projection area; and the projection area corresponding to the projection light source is contained in the observation area corresponding to the fisheye lens.
The dangerous behavior existence judging unit 200 may include:
the face image comprises a judging subunit, which is used for judging whether the monitoring image comprises a face image;
the child face judgment subunit is used for judging whether the child face is the child face or not according to the facial features of the face image when the child face image is included;
and the dangerous behavior existence judging subunit is used for judging that dangerous behaviors of turning the visual angle to the projection light source by the children exist when the faces of the children are the faces of the children.
Wherein, the child face judgment subunit may include:
the pupil distance and/or face size extraction module is used for extracting and obtaining the actual pupil distance and/or the actual face size from the face image;
the pupil distance and/or face size judging module is used for judging whether the actual pupil distance and/or the actual face size are within a preset pupil distance range of the child and/or a preset face size range of the child according to the actual pupil distance and/or the actual face size;
and the child face judgment module is used for judging the child face when the actual pupil distance and/or the actual face size are within a preset pupil distance range of the child and/or a preset face size range of the child.
The projection area adjusting unit 300 may include:
and the alternative projection area determining subunit is configured to select, by using the camera, a partial area, of the observation area, where the child face does not exist and the size of the partial area is consistent with that of the current projection area, as the alternative projection area.
Further, the projection apparatus may further include:
and after the current projection area is adjusted to the alternative projection area, clipping and anti-distortion processing is carried out on the image projected to the alternative projection area.
The projection area adjusting unit 300 may include:
the relative position relation calculating subunit is used for calculating to obtain a relative position relation between the candidate projection area and the current projection area;
and the motor control subunit is used for controlling a projection light source motor to drive the projection light source to rotate by a corresponding angle according to the relative position relationship so as to adjust the current projection area to the alternative projection area.
Further, the projection apparatus may further include:
the light intensity reducing and duration counting unit is used for reducing the light intensity of the projection light source before determining that no children's alternative projection area exists in the observation area observed by the fisheye lens, and counting to obtain the duration of the dangerous behaviors;
and the timeout processing unit is used for executing the determination of the alternative projection area without the child in the observation area observed by the fisheye lens when the duration exceeds the preset duration.
The present embodiment exists as an apparatus embodiment corresponding to the above method embodiment, and has all the beneficial effects of the method embodiment, and details are not repeated here.
Based on the foregoing embodiments, the present application further provides a projection device, where the projection device may include a memory and a processor, where the memory stores a computer program, and when the processor calls the computer program in the memory, the steps of the projection method provided in the foregoing embodiments may be implemented. Of course, the projection device may also include various necessary network interfaces, power supplies, and other components.
For a better understanding, the present application also provides a specific projection device to re-restore the present application, please refer to the front view and the side view of a cabinet type projection device shown in fig. 6 and fig. 7, respectively, and the front view of the projection area shown in fig. 8.
The cabinet type projection device shown in this example comprises a projection light source at the top, fisheye cameras (having the functions and characteristics of the cameras and the fisheye lenses) and TOF sensors respectively arranged at two sides below the projection light source, a display screen below the fisheye cameras and a projection light source motor hidden in the cabinet body.
Different from the scheme, the TOF sensor added in the embodiment is used for judging the distance of the front object and matching with the information shot by the fisheye camera to be recognized and processed by the main processor. The fisheye camera carries out face identification, after discerning the people's face, judges facial feature, including face type, interpupillary distance etc. the processor combines the distance of the place ahead personage that TOF sensor gave to the projecting apparatus, judges the face type size and the interpupillary distance size of face, can judge the age of place ahead personage like this according to inside database. When the processor judges that the character in front is the front of the projector, the projection brightness can be reduced, or the main processor sends a command, the projector is controlled by the projection light source motor, and the projection direction is rotated.
In this example, the determination of whether the child is present can be performed by using a general database, or by manually inputting the pupil distance and the facial form information, so that the determination is more accurate.
Meanwhile, the fisheye camera is adopted in the design, the fisheye camera has a large field angle, the whole projection range can be covered, the distance detection of the TOF sensor is matched, and after the human face is avoided, the fisheye camera can automatically identify the flat place in front of the projection to perform projection. Projected picture can be shot to the fisheye camera, and the turned angle of cooperation motor module can cut to the picture automatically, calibrates into normal display scale and size, avoids the distortion.
The present application further provides a readable storage medium, on which a computer program is stored, and the computer program, when executed by an execution terminal or a processor, can implement the steps of the projection method provided by the above embodiments. The storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It will be apparent to those skilled in the art that various changes and modifications can be made in the present invention without departing from the principles of the invention, and these changes and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A method of projection, comprising:
utilizing a camera to shoot to obtain a monitoring image of a projection area;
judging whether dangerous behaviors that the children turn the visual angle to the projection light source exist or not according to the monitoring image;
if the dangerous behaviors exist, determining an alternative projection area without children in an observation area observed by the fisheye lens, and adjusting the current projection area to the alternative projection area; and the projection area corresponding to the projection light source is contained in the observation area corresponding to the fisheye lens.
2. The projection method of claim 1, wherein determining whether there is a dangerous behavior of the child turning the viewing angle to the projection light source according to the monitoring image comprises:
judging whether the monitoring image contains a face image or not;
if the child face image contains the face image, judging whether the child face image is a child face according to the face features of the face image;
and if the human face is the child face, judging that dangerous behaviors that the child turns the visual angle to the projection light source exist.
3. The projection method according to claim 2, wherein determining whether the face image is a child face according to the facial features of the face image comprises:
extracting an actual pupil distance and/or an actual face size from the face image;
according to whether the actual pupil distance and/or the actual face size are/is in a preset pupil distance range of the child and/or a preset face size range of the child;
and if the actual pupil distance and/or the actual face size are/is in a preset pupil distance range of the child and/or a preset face size range of the child, judging that the child faces.
4. The projection method of claim 1, wherein determining an alternative projection region where no child is present in an observation region observed by a fisheye lens comprises:
and selecting a partial area, which does not have the face of the child in the observation area and has the size consistent with that of the current projection area, as the alternative projection area by using the camera.
5. The projection method according to claim 1, further comprising, after adjusting the current projection region to the alternative projection region:
and performing clipping and anti-distortion processing on the image projected to the alternative projection area.
6. The projection method of claim 1, wherein adjusting the current projection region to the alternative projection region comprises:
calculating to obtain the relative position relation between the alternative projection area and the current projection area;
and controlling a projection light source motor to drive the projection light source to rotate by a corresponding angle according to the relative position relation so as to adjust the current projection area to the alternative projection area.
7. The projection method according to any one of claims 1 to 6, wherein before determining that there is no candidate projection region for a child in the observation region observed by the fisheye lens, further comprising:
reducing the light intensity of the projection light source, and counting to obtain the duration of the dangerous behaviors;
and when the duration exceeds a preset duration, executing the step of determining that the alternative projection area of the child does not exist in the observation area observed by the fisheye lens.
8. A projection device, comprising:
the monitoring image shooting unit is used for shooting by utilizing a camera to obtain a monitoring image of a projection area;
the dangerous behavior existence judging unit is used for judging whether dangerous behaviors that children turn the view angle to the projection light source exist or not according to the monitoring image;
the projection area adjusting unit is used for determining an alternative projection area without children in an observation area observed by the fisheye lens when the dangerous behaviors exist, and adjusting the current projection area to the alternative projection area; and the projection area corresponding to the projection light source is contained in the observation area corresponding to the fisheye lens.
9. A projection device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the projection method according to any of claims 1 to 7 when executing the computer program.
10. A readable storage medium, characterized in that the readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the projection method according to any one of claims 1 to 7.
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| CN201911191578.9A CN111225197A (en) | 2019-11-28 | 2019-11-28 | Projection method, device, equipment and readable storage medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911191578.9A CN111225197A (en) | 2019-11-28 | 2019-11-28 | Projection method, device, equipment and readable storage medium |
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Application publication date: 20200602 |