CN112158705A - Light curtain imaging method and system, light curtain identification method and system, light curtain device and elevator equipment - Google Patents
Light curtain imaging method and system, light curtain identification method and system, light curtain device and elevator equipment Download PDFInfo
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- CN112158705A CN112158705A CN202010894504.8A CN202010894504A CN112158705A CN 112158705 A CN112158705 A CN 112158705A CN 202010894504 A CN202010894504 A CN 202010894504A CN 112158705 A CN112158705 A CN 112158705A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B13/00—Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
- B66B13/24—Safety devices in passenger lifts, not otherwise provided for, for preventing trapping of passengers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0006—Monitoring devices or performance analysers
- B66B5/0012—Devices monitoring the users of the elevator system
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0006—Monitoring devices or performance analysers
- B66B5/0018—Devices monitoring the operating condition of the elevator system
- B66B5/0031—Devices monitoring the operating condition of the elevator system for safety reasons
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Abstract
The invention discloses a light curtain imaging method and system, an identification method and system, a light curtain device and elevator equipment, wherein the light curtain imaging method comprises the following steps: drawing a light curtain frame at a set moment according to the condition that each receiving component of the light curtain receives data; each pixel unit in the light curtain frame can represent whether the receiving component receives data or not; and sequentially splicing the light curtain frames with a plurality of set time points to form light curtain imaging. According to the light curtain imaging method and system, the light curtain device and the elevator equipment, the passing object can be imaged through scanning of the light curtain, basic data are provided for subsequent object judgment, and technical support is provided for the light curtain Internet of things. The identification method and the identification system can identify objects (including objects and passengers) entering and exiting the elevator, and expand the function of the light curtain device.
Description
Technical Field
The invention belongs to the technical field of light curtain equipment, relates to an elevator light curtain, and particularly relates to a light curtain imaging method and system, an identification method and system, a light curtain device and elevator equipment.
Background
The elevator is the most common vertical transportation vehicle in modern high-rise buildings, saves time and physical strength of people and provides convenience for daily life. As a special device closely related to the life safety of the public, the safe operation of the elevator is receiving more and more attention from the society. However, because the elevator has a complex structure, the need to ensure safe and reliable operation of the elevator and detect the operation state and fault condition of the elevator become urgent needs for elevator management, maintenance and safe operation.
In order to improve the safety of the elevator, the elevator needs to be provided with a safety light curtain, and the safety light curtain utilizes an infrared transmitting device and an infrared receiving device which are arranged oppositely to receive and transmit signals so as to judge whether people or articles exist between the elevator doors.
Meanwhile, in order to improve the emergency response capability of the elevator, the concept of the internet of things of the elevator is gradually realized, and the property, an elevator operation company and a government department can remotely monitor the state of the elevator in real time, find abnormal conditions and acquire related information in time.
In addition, the existing elevator equipment usually checks objects entering and exiting the elevator through a camera manually, and no scheme capable of automatically identifying the shapes of the objects exists at present, and the intelligent degree of the elevator equipment needs to be further improved.
Therefore, the existing light curtain technology is only used for detecting whether objects exist or not, the passing objects cannot be identified, and the effect of the light curtain is greatly limited.
In view of the above, there is an urgent need to design a new elevator apparatus so as to overcome at least some of the above-mentioned disadvantages of the existing elevator apparatuses.
Disclosure of Invention
The invention provides a light curtain imaging method and system, a light curtain identification method and system, a light curtain device and elevator equipment.
In order to solve the technical problem, according to one aspect of the present invention, the following technical solutions are adopted:
a light curtain imaging method, the light curtain imaging method comprising:
drawing a light curtain frame at a set moment according to the condition that each receiving component of the light curtain receives data; each pixel unit in the light curtain frame can represent whether the receiving component receives data or not;
and sequentially splicing the light curtain frames with a plurality of set time points to form light curtain imaging.
As an embodiment of the present invention, the light curtain imaging method further includes:
acquiring a first time point at which a receiving part cannot receive a signal;
acquiring a second time point at which all receiving components can receive signals;
when the light curtain frame splicing is carried out, the light curtain frames between the first time point and the second time point are spliced to form corresponding light curtain imaging.
As an embodiment of the present invention, the light curtain includes a plurality of emitting components and a plurality of receiving components, and one emitting component cooperates with at least two receiving components;
shafts are formed between the transmitting component and each receiving component, and each transmitting component corresponds to a plurality of shafts; and when the signal received by the receiving part suddenly drops the set value, considering that the corresponding axis is blocked, and analyzing the signal of each frame to obtain all the blocking axes of the frame.
As an embodiment of the present invention, the light curtain imaging method further includes:
and traversing the axes of each frame from top to bottom in sequence, searching a first shielded axis, recording the height nTop of the current axis, continuously traversing downwards until the traversed current axis is not shielded, and recording the height nLow of the previous axis. Thus, the segment is a segment occluded by the current frame, and the segment is a line segment from nTop to nLow;
calculating capping height nTop; when the last lamp pPre of the current axis exists, searching whether the axis pAxis exists in the pPre and is blocked, and if the height of the receiving lamp corresponding to the axis pAxis is lower than that of the receiving lamp corresponding to the current axis, then nTop is (a2 b1-a1 b2)/(a2-a 1); otherwise, nTop is equal to half of the sum of the heights of the transmitting lamp and the receiving lamp of the current axis; wherein, the difference a1 between the height of the receiving lamp and the height of the transmitting lamp of the current axis, the difference a2 between the height of the receiving lamp and the height of the transmitting lamp of the axis pAxis, the height b1 of the transmitting lamp of the current axis and the height b2 of the transmitting lamp of the axis pAxis;
calculating the height nLow of the pocket bottom; when the next lamp of the current axis is present and an axis pAxis is occluded, if the received lamp of the axis pAxis is higher than that of the current axis, nLow ═ (a2 × b1-a1 × b2)/(a2-a 1); otherwise nLow equals half the sum of the current on-axis transmitting and receiving lamp heights.
As an embodiment of the present invention, all the blocking axes of each frame are acquired; sequentially traversing the axes of each frame from top to bottom, firstly finding a first shielded axis, recording the height nTop of the current axis, continuously traversing downwards until the traversed current axis is not shielded, and recording the height nLow of the previous axis. Thus, the segment is a segment occluded by the current frame, and the segment is a line segment from nTop to nLow;
and all the rest sections are sequentially solved downwards in this way, and the imaging of the current frame is finished.
According to another aspect of the invention, the following technical scheme is adopted: an identification method using a light curtain, the identification method comprising:
drawing a light curtain frame at a set moment according to the condition that each receiving component of the light curtain receives data; each pixel unit in the light curtain frame can represent whether the receiving component receives data or not;
sequentially splicing the light curtain frames with a plurality of set time points to form light curtain imaging;
and identifying the corresponding object passing through the light curtain according to the light curtain imaging.
As an embodiment of the present invention, the light curtain imaging method further includes:
acquiring a first time point at which a receiving part cannot receive a signal;
acquiring a second time point at which all receiving components can receive signals;
when the light curtain frame splicing is carried out, the light curtain frames between the first time point and the second time point are spliced to form corresponding light curtain imaging.
The light curtain comprises a plurality of transmitting components and a plurality of receiving components, and one transmitting component and at least two receiving components are matched to work;
shafts are formed between the transmitting component and each receiving component, and each transmitting component corresponds to a plurality of shafts; and when the signal received by the receiving part suddenly drops the set value, considering that the corresponding axis is blocked, and analyzing the signal of each frame to obtain all the blocking axes of the frame.
The light curtain imaging method further comprises the following steps:
and traversing the axes of each frame from top to bottom in sequence, searching a first shielded axis, recording the height nTop of the current axis, continuously traversing downwards until the traversed current axis is not shielded, and recording the height nLow of the previous axis. Thus, the segment is a segment occluded by the current frame, and the segment is a line segment from nTop to nLow;
calculating capping height nTop; when the last lamp pPre of the current axis exists, searching whether the axis pAxis exists in the pPre and is blocked, and if the height of the receiving lamp corresponding to the axis pAxis is lower than that of the receiving lamp corresponding to the current axis, then nTop is (a2 b1-a1 b2)/(a2-a 1); otherwise, nTop is equal to half of the sum of the heights of the transmitting lamp and the receiving lamp of the current axis; wherein, the difference a1 between the height of the receiving lamp and the height of the transmitting lamp of the current axis, the difference a2 between the height of the receiving lamp and the height of the transmitting lamp of the axis pAxis, the height b1 of the transmitting lamp of the current axis and the height b2 of the transmitting lamp of the axis pAxis;
calculating the height nLow of the pocket bottom; when the next lamp of the current axis is present and an axis pAxis is occluded, if the received lamp of the axis pAxis is higher than that of the current axis, nLow ═ (a2 × b1-a1 × b2)/(a2-a 1); otherwise nLow equals half the sum of the current on-axis transmitting and receiving lamp heights.
Acquiring all the shielding shafts of each frame; sequentially traversing the axes of each frame from top to bottom, firstly finding a first shielded axis, recording the height nTop of the current axis, continuously traversing downwards until the traversed current axis is not shielded, and recording the height nLow of the previous axis. Thus, the segment is a segment occluded by the current frame, and the segment is a line segment from nTop to nLow;
and all the rest sections are sequentially solved downwards in this way, and the imaging of the current frame is finished.
According to another aspect of the invention, the following technical scheme is adopted: a light curtain imaging system, comprising:
the light curtain frame drawing module is used for drawing light curtain frames at set moments according to the condition that each receiving component of the light curtain receives data; each pixel unit in the light curtain frame can represent whether the receiving component receives data or not;
and the light curtain imaging generation module is used for sequentially splicing the light curtain frames which are set with a plurality of time points and drawn by the light curtain frame drawing module to form light curtain imaging.
According to another aspect of the invention, the following technical scheme is adopted: an identification system utilizing a light curtain, the identification system comprising:
the light curtain frame drawing module is used for drawing light curtain frames at set moments according to the condition that each receiving component of the light curtain receives data; each pixel unit in the light curtain frame can represent whether the receiving component receives data or not;
and the light curtain imaging generation module is used for sequentially splicing the light curtain frames which are set with a plurality of time points and drawn by the light curtain frame drawing module to form light curtain imaging.
And the identification module is used for identifying the corresponding object passing through the light curtain according to the light curtain image generated by the light curtain image generation module.
According to another aspect of the invention, the following technical scheme is adopted: a light curtain device, comprising: the light curtain imaging system or/and the identification system.
According to another aspect of the invention, the following technical scheme is adopted: an elevator device comprises the light curtain device.
The invention has the beneficial effects that: according to the light curtain imaging method and system, the light curtain device and the elevator equipment, the passing object can be imaged through scanning of the light curtain, basic data are provided for subsequent object judgment, and technical support is provided for the light curtain Internet of things. The identification method and the identification system can identify objects (including objects and passengers) entering and exiting the elevator, and expand the function of the light curtain device.
Drawings
Fig. 1 is a flowchart of a light curtain imaging method according to an embodiment of the invention.
Fig. 2 is a flowchart illustrating an identification method using a light curtain according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a light curtain imaging system according to an embodiment of the invention.
Fig. 4 is a schematic composition diagram of an identification method using a light curtain according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a radiating element having several axes in accordance with an embodiment of the present invention.
Fig. 6 is a schematic diagram of a light curtain emitting component and a light curtain receiving component according to an embodiment of the invention.
Fig. 7 is a schematic diagram illustrating an imaging effect of a light curtain frame according to an embodiment of the invention.
Fig. 8 is a schematic imaging diagram of a light curtain imaging method (imaging includes a battery car) according to an embodiment of the invention.
FIG. 9 is a schematic diagram of an imaging method of a light curtain (imaging including a cart) according to an embodiment of the present invention
FIG. 10 is a schematic diagram of an imaging method of a light curtain (imaging including a cart) according to an embodiment of the present invention
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The description in this section is for several exemplary embodiments only, and the present invention is not limited only to the scope of the embodiments described. It is within the scope of the present disclosure and protection that the same or similar prior art means and some features of the embodiments may be interchanged.
The steps in the embodiments in the specification are only expressed for convenience of description, and the implementation manner of the present application is not limited by the order of implementation of the steps. The term "connected" in the specification includes both direct connection and indirect connection.
The invention discloses a light curtain imaging method, and fig. 1 is a flow chart of the light curtain imaging method in an embodiment of the invention; referring to fig. 1, the light curtain imaging method includes:
step S1, drawing a light curtain frame at a set time according to the condition that each receiving component of the light curtain receives data; each pixel unit in the light curtain frame can represent whether the receiving component receives data or not;
step S2, sequentially concatenating the light curtain frames at multiple time points to form a light curtain image (see fig. 8 to 10).
In an embodiment of the present invention, the light curtain imaging method further includes: acquiring a first time point at which a receiving part cannot receive a signal; and acquiring a second time point at which all the receiving parts can receive the signals. In step S2, when the light curtain frame is spliced, the light curtain frames between the first time point and the second time point are spliced to form corresponding light curtain images.
In an embodiment of the present invention, the transmitting part may be a transmitting lamp, and the receiving part may be a receiving lamp. The light curtain comprises a plurality of transmitting components and a plurality of receiving components, wherein one transmitting component and at least two receiving components are matched to work (as shown in figures 5 and 6). Shafts are formed between the transmitting component and each receiving component, and each transmitting component corresponds to a plurality of shafts; and when the signal received by the receiving part suddenly drops the set value, considering that the corresponding axis is blocked, and analyzing the signal of each frame to obtain all the blocking axes of the frame.
In an embodiment of the present invention, the light curtain imaging method further includes:
and traversing the axes of each frame from top to bottom in sequence, searching a first shielded axis, recording the height nTop of the current axis, continuously traversing downwards until the traversed current axis is not shielded, and recording the height nLow of the previous axis. Thus, the segment is a segment occluded by the current frame, and the segment is a line segment from nTop to nLow;
calculating capping height nTop; when the last lamp pPre of the current axis exists, searching whether the axis pAxis exists in the pPre and is blocked, and if the height of the receiving lamp corresponding to the axis pAxis is lower than that of the receiving lamp corresponding to the current axis, then nTop is (a2 b1-a1 b2)/(a2-a 1); otherwise, nTop is equal to half of the sum of the heights of the transmitting lamp and the receiving lamp of the current axis; wherein, the difference a1 between the height of the receiving lamp and the height of the transmitting lamp of the current axis, the difference a2 between the height of the receiving lamp and the height of the transmitting lamp of the axis pAxis, the height b1 of the transmitting lamp of the current axis and the height b2 of the transmitting lamp of the axis pAxis;
calculating the height nLow of the pocket bottom; when the next lamp of the current axis is present and an axis pAxis is occluded, if the received lamp of the axis pAxis is higher than that of the current axis, nLow ═ (a2 × b1-a1 × b2)/(a2-a 1); otherwise nLow equals half the sum of the current on-axis transmitting and receiving lamp heights.
In an embodiment of the present invention, all the blocking axes of each frame are obtained; sequentially traversing the axes of each frame from top to bottom, firstly finding a first shielded axis, recording the height nTop of the current axis, continuously traversing downwards until the traversed current axis is not shielded, and recording the height nLow of the previous axis. This is the segment occluded by the current frame, which is a segment from nTop to nLow. All the remaining segments are thus sequentially found downwards, and the imaging of the current frame is completed (as shown in fig. 7).
The invention discloses an identification method by using a light curtain, which comprises the following steps:
step S1, drawing a light curtain frame at a set time according to the condition that each receiving component of the light curtain receives data; each pixel unit in the light curtain frame can represent whether the receiving component receives data or not;
step S2, splicing the light curtain frames with a plurality of set time points in sequence to form light curtain imaging;
step S3, identifying the corresponding object passing through the light curtain according to the light curtain imaging.
In an embodiment of the present invention, the light curtain imaging method further includes: acquiring a first time point at which a receiving part cannot receive a signal; and acquiring a second time point at which all the receiving parts can receive the signals. In step S2, when the light curtain frame is spliced, the light curtain frames between the first time point and the second time point are spliced to form corresponding light curtain images.
The light curtain comprises a plurality of transmitting components and a plurality of receiving components, and one transmitting component and at least two receiving components are matched to work;
shafts are formed between the transmitting component and each receiving component, and each transmitting component corresponds to a plurality of shafts; and when the signal received by the receiving part suddenly drops the set value, considering that the corresponding axis is blocked, and analyzing the signal of each frame to obtain all the blocking axes of the frame.
The light curtain imaging method further comprises the following steps:
and traversing the axes of each frame from top to bottom in sequence, searching a first shielded axis, recording the height nTop of the current axis, continuously traversing downwards until the traversed current axis is not shielded, and recording the height nLow of the previous axis. Thus, the segment is a segment occluded by the current frame, and the segment is a line segment from nTop to nLow;
calculating capping height nTop; when the last lamp pPre of the current axis exists, searching whether the axis pAxis exists in the pPre and is blocked, and if the height of the receiving lamp corresponding to the axis pAxis is lower than that of the receiving lamp corresponding to the current axis, then nTop is (a2 b1-a1 b2)/(a2-a 1); otherwise, nTop is equal to half of the sum of the heights of the transmitting lamp and the receiving lamp of the current axis; wherein, the difference a1 between the height of the receiving lamp and the height of the transmitting lamp of the current axis, the difference a2 between the height of the receiving lamp and the height of the transmitting lamp of the axis pAxis, the height b1 of the transmitting lamp of the current axis and the height b2 of the transmitting lamp of the axis pAxis;
calculating the height nLow of the pocket bottom; when the next lamp of the current axis is present and an axis pAxis is occluded, if the received lamp of the axis pAxis is higher than that of the current axis, nLow ═ (a2 × b1-a1 × b2)/(a2-a 1); otherwise nLow equals half the sum of the current on-axis transmitting and receiving lamp heights.
Acquiring all the shielding shafts of each frame; sequentially traversing the axes of each frame from top to bottom, firstly finding a first shielded axis, recording the height nTop of the current axis, continuously traversing downwards until the traversed current axis is not shielded, and recording the height nLow of the previous axis. This is the segment occluded by the current frame, which is a segment from nTop to nLow. And all the rest sections are sequentially solved downwards in this way, and the imaging of the current frame is finished.
FIG. 3 is a schematic diagram of a light curtain imaging system according to an embodiment of the present invention; referring to fig. 3, the light curtain imaging system includes: the device comprises a light curtain frame drawing module 1 and a light curtain imaging generation module 2. The light curtain frame drawing module 1 is used for drawing a light curtain frame at a set moment according to the condition that each receiving component of a light curtain receives data; each pixel cell in the light sheet frame can represent whether the receiving component receives data. The light curtain imaging generation module 2 is used for sequentially splicing the light curtain frames which are set with a plurality of time points and drawn by the light curtain frame drawing module 1 to form light curtain imaging.
Fig. 4 is a schematic diagram illustrating an identification method using a light curtain according to an embodiment of the present invention; the recognition system includes: the system comprises a light curtain frame drawing module 1, a light curtain imaging generation module 2 and an identification module 3.
The light curtain frame drawing module 1 is used for drawing a light curtain frame at a set moment according to the condition that each receiving component of a light curtain receives data; each pixel cell in the light sheet frame can represent whether the receiving component receives data. The light curtain imaging generation module 2 is used for sequentially splicing the light curtain frames which are set with a plurality of time points and drawn by the light curtain frame drawing module 1 to form light curtain imaging. The recognition module 3 is used for recognizing the corresponding object passing through the light curtain according to the light curtain image generated by the light curtain image generation module 2.
The present invention further discloses a light curtain device, comprising: the light curtain imaging system or/and the identification system. The invention further relates to an elevator installation comprising a light curtain device as described above.
In summary, the light curtain imaging method and system, the light curtain device and the elevator equipment provided by the invention can image passing objects through the scanning of the light curtain, provide basic data for subsequent object judgment, and provide technical support for the light curtain internet of things. The identification method and the identification system can identify objects (including objects and passengers) entering and exiting the elevator, and expand the function of the light curtain device.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The description and applications of the invention herein are illustrative and are not intended to limit the scope of the invention to the embodiments described above. Effects or advantages referred to in the embodiments may not be reflected in the embodiments due to interference of various factors, and the description of the effects or advantages is not intended to limit the embodiments. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.
Claims (11)
1. A light curtain imaging method, comprising:
drawing a light curtain frame at a set moment according to the condition that each receiving component of the light curtain receives data; each pixel unit in the light curtain frame can represent whether the receiving component receives data or not;
and sequentially splicing the light curtain frames with a plurality of set time points to form light curtain imaging.
2. The light curtain imaging method as claimed in claim 1, wherein:
the light curtain imaging method further comprises the following steps:
acquiring a first time point at which a receiving part cannot receive a signal;
acquiring a second time point at which all receiving components can receive signals;
when the light curtain frame splicing is carried out, the light curtain frames between the first time point and the second time point are spliced to form corresponding light curtain imaging.
3. The light curtain imaging method as claimed in claim 1, wherein:
the light curtain comprises a plurality of transmitting components and a plurality of receiving components, and one transmitting component and at least two receiving components are matched to work;
shafts are formed between the transmitting component and each receiving component, and each transmitting component corresponds to a plurality of shafts; and when the signal received by the receiving part suddenly drops the set value, considering that the corresponding axis is blocked, and analyzing the signal of each frame to obtain all the blocking axes of the frame.
4. The light curtain imaging method as claimed in claim 3, wherein:
the light curtain imaging method further comprises the following steps:
and traversing the axes of each frame from top to bottom in sequence, searching a first shielded axis, recording the height nTop of the current axis, continuously traversing downwards until the traversed current axis is not shielded, and recording the height nLow of the previous axis. Thus, the segment is a segment occluded by the current frame, and the segment is a line segment from nTop to nLow;
calculating capping height nTop; when the last lamp pPre of the current axis exists, searching whether the axis pAxis exists in the pPre and is blocked, and if the height of the receiving lamp corresponding to the axis pAxis is lower than that of the receiving lamp corresponding to the current axis, then nTop is (a2 b1-a1 b2)/(a2-a 1); otherwise, nTop is equal to half of the sum of the heights of the transmitting lamp and the receiving lamp of the current axis; wherein, the difference a1 between the height of the receiving lamp and the height of the transmitting lamp of the current axis, the difference a2 between the height of the receiving lamp and the height of the transmitting lamp of the axis pAxis, the height b1 of the transmitting lamp of the current axis and the height b2 of the transmitting lamp of the axis pAxis;
calculating the height nLow of the pocket bottom; when the next lamp of the current axis is present and an axis pAxis is occluded, if the received lamp of the axis pAxis is higher than that of the current axis, nLow ═ (a2 × b1-a1 × b2)/(a2-a 1); otherwise nLow equals half the sum of the current on-axis transmitting and receiving lamp heights.
5. The light curtain imaging method as claimed in claim 4, wherein:
acquiring all the shielding shafts of each frame; sequentially traversing the axes of each frame from top to bottom, firstly finding a first shielded axis, recording the height nTop of the current axis, continuously traversing downwards until the traversed current axis is not shielded, and recording the height nLow of the previous axis. Thus, the segment is a segment occluded by the current frame, and the segment is a line segment from nTop to nLow;
and all the rest sections are sequentially solved downwards in this way, and the imaging of the current frame is finished.
6. An identification method using a light curtain, the identification method comprising:
drawing a light curtain frame at a set moment according to the condition that each receiving component of the light curtain receives data; each pixel unit in the light curtain frame can represent whether the receiving component receives data or not;
sequentially splicing the light curtain frames with a plurality of set time points to form light curtain imaging;
and identifying the corresponding object passing through the light curtain according to the light curtain imaging.
7. The identification method using a light curtain as claimed in claim 6, wherein:
the light curtain imaging method further comprises the following steps:
acquiring a first time point at which a receiving part cannot receive a signal;
acquiring a second time point at which all receiving components can receive signals;
when the light curtain frame splicing is carried out, splicing the light curtain frames from the first time point to the second time point to form corresponding light curtain imaging;
the light curtain comprises a plurality of transmitting components and a plurality of receiving components, and one transmitting component and at least two receiving components are matched to work;
shafts are formed between the transmitting component and each receiving component, and each transmitting component corresponds to a plurality of shafts; after the signal received by the receiving part suddenly drops the set value, considering that the corresponding axis is blocked, analyzing the signal of each frame, and acquiring all the blocking axes of the frame; the light curtain imaging method further comprises the following steps:
and traversing the axes of each frame from top to bottom in sequence, searching a first shielded axis, recording the height nTop of the current axis, continuously traversing downwards until the traversed current axis is not shielded, and recording the height nLow of the previous axis. Thus, the segment is a segment occluded by the current frame, and the segment is a line segment from nTop to nLow;
calculating capping height nTop; when the last lamp pPre of the current axis exists, searching whether the axis pAxis exists in the pPre and is blocked, and if the height of the receiving lamp corresponding to the axis pAxis is lower than that of the receiving lamp corresponding to the current axis, then nTop is (a2 b1-a1 b2)/(a2-a 1); otherwise, nTop is equal to half of the sum of the heights of the transmitting lamp and the receiving lamp of the current axis; wherein, the difference a1 between the height of the receiving lamp and the height of the transmitting lamp of the current axis, the difference a2 between the height of the receiving lamp and the height of the transmitting lamp of the axis pAxis, the height b1 of the transmitting lamp of the current axis and the height b2 of the transmitting lamp of the axis pAxis;
calculating the height nLow of the pocket bottom; when the next lamp of the current axis is present and an axis pAxis is occluded, if the received lamp of the axis pAxis is higher than that of the current axis, nLow ═ (a2 × b1-a1 × b2)/(a2-a 1); otherwise nLow equals half of the sum of the heights of the transmitting lamp and the receiving lamp on the current axis;
acquiring all the shielding shafts of each frame; sequentially traversing the axes of each frame from top to bottom, firstly finding a first shielded axis, recording the height nTop of the current axis, continuously traversing downwards until the traversed current axis is not shielded, and recording the height nLow of the previous axis. Thus, the segment is a segment occluded by the current frame, and the segment is a line segment from nTop to nLow;
and all the rest sections are sequentially solved downwards in this way, and the imaging of the current frame is finished.
8. A light curtain imaging system, comprising:
the light curtain frame drawing module is used for drawing light curtain frames at set moments according to the condition that each receiving component of the light curtain receives data; each pixel unit in the light curtain frame can represent whether the receiving component receives data or not;
and the light curtain imaging generation module is used for sequentially splicing the light curtain frames which are set with a plurality of time points and drawn by the light curtain frame drawing module to form light curtain imaging.
9. An identification system using a light curtain, the identification system comprising:
the light curtain frame drawing module is used for drawing light curtain frames at set moments according to the condition that each receiving component of the light curtain receives data; each pixel unit in the light curtain frame can represent whether the receiving component receives data or not;
and the light curtain imaging generation module is used for sequentially splicing the light curtain frames which are set with a plurality of time points and drawn by the light curtain frame drawing module to form light curtain imaging.
And the identification module is used for identifying the corresponding object passing through the light curtain according to the light curtain image generated by the light curtain image generation module.
10. A light curtain device, characterized in that it comprises: the light curtain imaging system of claim 8 or/and the identification system of claim 9.
11. An elevator installation, characterized in that it comprises: the light curtain device as claimed in claim 10.
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