CN110668274A - Method and device for displaying remaining number of people available in elevator - Google Patents
Method and device for displaying remaining number of people available in elevator Download PDFInfo
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- CN110668274A CN110668274A CN201910940012.5A CN201910940012A CN110668274A CN 110668274 A CN110668274 A CN 110668274A CN 201910940012 A CN201910940012 A CN 201910940012A CN 110668274 A CN110668274 A CN 110668274A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
- B66B1/3476—Load weighing or car passenger counting devices
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/40—Scenes; Scene-specific elements in video content
- G06V20/46—Extracting features or characteristics from the video content, e.g. video fingerprints, representative shots or key frames
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/50—Context or environment of the image
- G06V20/52—Surveillance or monitoring of activities, e.g. for recognising suspicious objects
- G06V20/53—Recognition of crowd images, e.g. recognition of crowd congestion
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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
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Abstract
The invention provides a method and a device for displaying the number of remaining loadable people in an elevator, wherein a camera is arranged at the top of the center of the elevator, an elevator car is taken as an application background through a video acquisition technology, the head contour of a video frame image is extracted, the condition of overlapping the head image is analyzed, whether the head is a person is judged according to the area of the fitted curve contour through curve fitting, so that the number of people in the elevator is judged, the number of the remaining loadable people in the elevator is converted into the number of the remaining loadable people in the elevator, the number of the remaining loadable people in the elevator is sent to an elevator floor display screen to be displayed, and clear information is given to passengers riding the elevator, so that the passengers can make corresponding correct judgment, and the waiting time of the passengers in the elevator is saved.
Description
Technical Field
The invention relates to the technical field of elevator operation equipment, in particular to a method and a device for displaying the number of remaining loadable people in an elevator.
Background
The elevator that moves in the existing market can not give the information of the number of people in the passenger elevator, when taking the elevator, can only see which floor the elevator moves to, but can't judge the carrying state of this elevator accurately, can't judge whether this elevator is in full load state to can't judge oneself and carry on this elevator in proper order.
Generally, thousands of office workers exist in a large office building, people are always puzzled by the trouble of taking the elevator for going to and from the office, the elevator is in a full state when the elevator arrives at an elevator entrance, time waste can be caused by continuously searching the elevator which can be taken, the card-taking for going to the office is delayed, and the time for waiting for one elevator exceeds the time for climbing the building.
Therefore, there is a need for a method for displaying the remaining number of people in an elevator, so as to reduce the waiting time of office workers for the elevator, and give clear information to passengers taking the elevator, so as to help the passengers to make corresponding correct judgment.
Disclosure of Invention
The invention aims to provide a method and a device for displaying the number of remaining persons capable of carrying in an elevator, which aim to solve the problem that in the prior art, elevator passengers cannot know the number of remaining persons capable of carrying in the elevator, and realize that clear information is given to the passengers taking the elevator so as to help the passengers to make corresponding correct judgment and save the waiting time of the elevator passengers.
In order to achieve the technical purpose, the invention provides a method for displaying the number of remaining loadable people in an elevator, which comprises the following steps:
s1, acquiring a video in the elevator motion process through a camera, and extracting a video frame image;
s2, carrying out image preprocessing on the video frame image, and carrying out contour extraction on the preprocessed image;
s3, performing curve fitting on the contour data matrix, judging whether the contour data matrix is a human head image according to the fitted curve contour area, performing inflection point analysis on the overlapped head image, performing secondary curve fitting, and counting the number of human heads in the elevator;
and S4, obtaining the number of the remaining persons carried by the elevator according to the difference value between the elevator threshold value and the number of the heads of the persons in the elevator, uploading the number of the remaining persons carried by the elevator to a rear-end server, and displaying the number of the remaining persons carried by the elevator on an elevator floor display screen by the rear-end server.
Preferably, the camera covers an angle of 180 degrees, and the width pixel of the human head target in the detection area is not less than 10 pixel points.
Preferably, the curve fitting equation is:
Ax2+Bxy+Cy2+Dy+Ey+F＝0。
preferably, the operation of step S3 is as follows:
performing curve fitting on the contour data matrix, presetting a threshold interval of the area of the head image, and determining the contour of the head of the person when the fitted curve contour area is in the threshold interval; when the area is 1.5-2.0 times of the upper limit of the threshold value, judging whether the fitted curve contour has an inflection point, when the inflection point exists, randomly selecting at least 6 points from the initial point to the inflection point of the head contour data matrix and from the inflection point to the end point of the head contour data matrix to perform quadratic curve fitting by taking the inflection point as a boundary point, judging whether the fitted contour is a human head according to the size of the contour area of the quadratic curve fitting, and counting the number of the head contours to be used as the number of the human heads in the elevator.
The invention also provides a device for displaying the number of remaining loadable people in the elevator, which comprises the following modules:
the video frame image extraction module is used for acquiring a video in the elevator motion process through a camera and extracting a video frame image;
the contour extraction module is used for carrying out image preprocessing on the video frame image and carrying out contour extraction on the preprocessed image;
the human head identification module is used for performing curve fitting on the contour data matrix, judging whether the contour data matrix is a human head image according to the fitted curve contour area, performing inflection point analysis on the overlapped head image, performing secondary curve fitting, and counting the number of human heads in the elevator;
and the quantity display module is used for obtaining the number of the remaining loadable people of the elevator according to the difference value between the elevator threshold value and the number of the heads of the people in the elevator, uploading the number to the rear-end server, and the rear-end server displays the number of the remaining loadable people of the elevator on the elevator floor display screen.
Preferably, the camera covers an angle of 180 degrees, and the width pixel of the human head target in the detection area is not less than 10 pixel points.
Preferably, the curve fitting equation is:
Ax2+Bxy+Cy2+Dx+Ey+F＝0。
preferably, the remaining number of persons carried by the elevator is the number of persons carried by the elevator minus the number of heads of the persons in the elevator.
The effect provided in the summary of the invention is only the effect of the embodiment, not all the effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
compared with the prior art, the elevator head contour extraction method has the advantages that the camera is arranged at the top of the elevator center, the elevator car is used as an application background through a video acquisition technology, the head contour extraction is carried out on the video frame image, the overlapping condition of the head image is analyzed, whether the head is a person or not is judged through curve fitting and the fitted curve contour area, so that the number of people in the elevator is judged, the number of people is converted into the remaining number of people capable of being carried by the elevator, the remaining number of people is sent to the elevator floor display screen to be displayed, clear information is given to passengers riding the elevator, the passengers can make corresponding correct judgment, and the waiting time of the passengers in the elevator is saved.
Drawings
Fig. 1 is a flow chart of a method for displaying the number of persons remaining in an elevator according to an embodiment of the present invention;
fig. 2 is a block diagram of a device for displaying the number of persons remaining in an elevator according to an embodiment of the present invention.
Detailed Description
In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
The following describes a method and a device for displaying the number of remaining persons in an elevator, which are provided by the embodiments of the present invention, in detail with reference to the accompanying drawings.
As shown in FIG. 1, the embodiment of the invention discloses a method for displaying the number of persons remaining in an elevator, which comprises the following steps:
s1, acquiring a video in the elevator motion process through a camera, and extracting a video frame image;
s2, carrying out image preprocessing on the video frame image, and carrying out contour extraction on the preprocessed image;
s3, performing curve fitting on the contour data matrix, judging whether the contour data matrix is a human head image according to the fitted curve contour area, performing inflection point analysis on the overlapped head image, performing secondary curve fitting, and counting the number of human heads in the elevator;
and S4, obtaining the number of the remaining persons carried by the elevator according to the difference value between the elevator threshold value and the number of the heads of the persons in the elevator, uploading the number of the remaining persons carried by the elevator to a rear-end server, and displaying the number of the remaining persons carried by the elevator on an elevator floor display screen by the rear-end server.
According to the embodiment of the invention, the personnel density recognition camera with a scene covering 180-degree angle is installed in the elevator, the real-time personnel number in the elevator is recognized through an image recognition algorithm, the recognized personnel number in the elevator is converted into the residual loadable personnel number in the elevator through data extraction and conversion, and the residual loadable personnel number is uploaded to the server and then uploaded to and displayed beside the elevator floor display screen.
In the embodiment of the invention, the personnel density identification camera needs to cover a 180-degree angle scene in the elevator, so that personnel conditions in the elevator can be shot without dead angles, and in addition, the focal length of the camera is adjusted according to the requirement of a focal length scene, so that the width pixel requirement of a head target in a detection area is not less than 10 pixel points, and the accuracy of image identification is favorably improved.
The interior of an elevator car is used as an application background, an identification camera is erected at the top of the center of the car, and the whole elevator car is taken in. Because the number of people in the ascending or descending process of the elevator is stable and unchanged, the video frame is extracted from the video in the running process, and because the conditions such as background light, brightness and the like in the elevator are not changed, the advantage that the elevator car is used as an application background is fully utilized to carry out image processing on the video frame. The method comprises the steps of firstly preprocessing a video frame image, wherein the preprocessing comprises graying processing and binarization processing, the binarization processing is favorable for further processing of the image, the data volume is reduced, the image is simplified, and the outline of the image is extracted after preprocessing.
Because the camera shoots the situation of the person in the elevator car from top to bottom, the outline of the head of the person in the video frame image is approximately circular, the head of the person suspected in the image is found through curve fitting, and whether the head of the person is judged according to the area of the outline subjected to curve fitting. The curve fitting equation is as follows:
Ax2+Bxy+Cy2+Dx+Ey+F＝0
and (3) performing least square processing on the points after the edge detection by using the equation:
the constraint condition is that A + C is 1, a linear equation set is obtained, the equation is solved, the solution of the equation is used as the best fit of the contour, the contour area is calculated according to a fitted contour curve to judge whether the contour is the head, and the contour of the head of the person is determined by presetting a threshold interval of the image area of the head when the contour area is in the threshold interval.
And when the area of the fitted contour is larger than the threshold and the area is 1.5-2.0 times of the upper limit of the threshold, judging whether the contour has an inflection point. Since the situation that the head of a person in the elevator is in contact, or the person is in contact left and right, or in contact front and back, appears as two circles overlapping on the image, the situation that the head images overlap is judged through the contour inflection point. And taking the inflection point as a boundary point, randomly selecting at least 6 points from the starting point to the inflection point of the head contour data matrix and from the inflection point to the end point of the head contour data matrix to perform quadratic curve fitting, and judging whether the head is a human head according to the contour area of the quadratic curve fitting. And counting the number of the head profiles as the number of people in the final elevator car.
The number of people in the elevator car is sent to the background server, the background server carries out data conversion on the number of people, the number of people in the elevator is converted into the number of people remaining in the elevator, the number of people remaining in the elevator is subtracted by the number of people in the elevator in real time, and the number of people remaining in the elevator is sent to the floor display screen of the elevator, so that passengers waiting to take the elevator can see that the elevator runs to several floors, the number of people remaining in the elevator can be seen, and the elevator can be selected to wait to take the elevator.
According to the embodiment of the invention, the camera is arranged at the top of the elevator center, the elevator car is taken as an application background through a video acquisition technology, the head outline extraction is carried out on the video frame image, the overlapping condition of the head image is analyzed, whether the head is a person is judged through curve fitting and the size of the area of the fitted curve outline, so that the number of people in the elevator is judged, the number of people is converted into the number of the remaining people capable of being carried by the elevator, the number of people is sent to the elevator floor display screen to be displayed, the clear information is given to the passengers riding the elevator, the passengers can make corresponding correct judgment, and the waiting time of the passengers in the elevator is saved.
As shown in fig. 2, the embodiment of the invention also discloses a device for displaying the number of remaining loadable people in an elevator, which comprises the following modules:
the video frame image extraction module is used for acquiring a video in the elevator motion process through a camera and extracting a video frame image;
the contour extraction module is used for carrying out image preprocessing on the video frame image and carrying out contour extraction on the preprocessed image;
the human head identification module is used for performing curve fitting on the contour data matrix, judging whether the contour data matrix is a human head image according to the fitted curve contour area, performing inflection point analysis on the overlapped head image, performing secondary curve fitting, and counting the number of human heads in the elevator;
and the quantity display module is used for obtaining the number of the remaining loadable people of the elevator according to the difference value between the elevator threshold value and the number of the heads of the people in the elevator, uploading the number to the rear-end server, and the rear-end server displays the number of the remaining loadable people of the elevator on the elevator floor display screen.
The camera needs to cover a scene with an angle of 180 degrees in the elevator, can shoot the personnel condition in the elevator without dead angles, and adjusts the focal length of the camera according to the requirement of the focal length scene, so that the width pixel requirement of a human head target in a detection area is not less than 10 pixel points, and the accuracy of image identification is improved.
The interior of an elevator car is used as an application background, an identification camera is erected at the top of the center of the car, and the whole elevator car is taken in. Because the number of people in the ascending or descending process of the elevator is stable and unchanged, the video frame is extracted from the video in the running process, and because the conditions such as background light, brightness and the like in the elevator are not changed, the advantage that the elevator car is used as an application background is fully utilized to carry out image processing on the video frame. The method comprises the steps of firstly preprocessing a video frame image, wherein the preprocessing comprises graying processing and binarization processing, the binarization processing is favorable for further processing of the image, the data volume is reduced, the image is simplified, and the outline of the image is extracted after preprocessing.
Because the camera shoots the situation of the person in the elevator car from top to bottom, the outline of the head of the person in the video frame image is approximately circular, the head of the person suspected in the image is found through curve fitting, and whether the head of the person is judged according to the area of the outline subjected to curve fitting. The curve fitting equation is as follows:
Ax2+Bxy+Cy2+Dx+Ey+F＝0
and (3) performing least square processing on the points after the edge detection by using the equation:
the constraint condition is that A + C is 1, a linear equation set is obtained, the equation is solved, the solution of the equation is used as the best fit of the contour, the contour area is calculated according to a fitted contour curve to judge whether the contour is the head, and the contour of the head of the person is determined by presetting a threshold interval of the image area of the head when the contour area is in the threshold interval.
And when the area of the fitted contour is larger than the threshold and the area is 1.5-2.0 times of the upper limit of the threshold, judging whether the contour has an inflection point. Since the situation that the head of a person in the elevator is in contact, or the person is in contact left and right, or in contact front and back, appears as two circles overlapping on the image, the situation that the head images overlap is judged through the contour inflection point. And taking the inflection point as a boundary point, randomly selecting at least 6 points from the starting point to the inflection point of the head contour data matrix and from the inflection point to the end point of the head contour data matrix to perform quadratic curve fitting, and judging whether the head is a human head according to the contour area of the quadratic curve fitting. And counting the number of the head profiles as the number of people in the final elevator car.
The number of people in the elevator car is sent to the background server, the background server carries out data conversion on the number of people, the number of people in the elevator is converted into the number of people remaining in the elevator, the number of people remaining in the elevator is subtracted by the number of people in the elevator in real time, and the number of people remaining in the elevator is sent to the floor display screen of the elevator, so that passengers waiting to take the elevator can see that the elevator runs to several floors, the number of people remaining in the elevator can be seen, and the elevator can be selected to wait to take the elevator.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A method of displaying the number of remaining persons in an elevator, the method comprising the steps of:
s1, acquiring a video in the elevator motion process through a camera, and extracting a video frame image;
s2, carrying out image preprocessing on the video frame image, and carrying out contour extraction on the preprocessed image;
s3, performing curve fitting on the contour data matrix, judging whether the contour data matrix is a human head image according to the fitted curve contour area, performing inflection point analysis on the overlapped head image, performing secondary curve fitting, and counting the number of human heads in the elevator;
and S4, obtaining the number of the remaining persons carried by the elevator according to the difference value between the elevator threshold value and the number of the heads of the persons in the elevator, uploading the number of the remaining persons carried by the elevator to a rear-end server, and displaying the number of the remaining persons carried by the elevator on an elevator floor display screen by the rear-end server.
2. The method of claim 1, wherein the camera covers an angle of 180 degrees and the width pixels of the human head target in the detection area are not less than 10 pixels.
3. The method of claim 1, wherein the curve fitting equation is:
Ax2+Bxy+Cy2+Dx+Ey+F＝0。
4. the method as claimed in claim 1, wherein the step S3 is implemented by the following steps:
performing curve fitting on the contour data matrix, presetting a threshold interval of the area of the head image, and determining the contour of the head of the person when the fitted curve contour area is in the threshold interval; when the area is 1.5-2.0 times of the upper limit of the threshold value, judging whether the fitted curve contour has an inflection point, when the inflection point exists, randomly selecting at least 6 points from the initial point to the inflection point of the head contour data matrix and from the inflection point to the end point of the head contour data matrix to perform quadratic curve fitting by taking the inflection point as a boundary point, judging whether the fitted contour is a human head according to the size of the contour area of the quadratic curve fitting, and counting the number of the head contours to be used as the number of the human heads in the elevator.
5. A device for displaying the number of persons remaining in an elevator, said device comprising the following modules:
the video frame image extraction module is used for acquiring a video in the elevator motion process through a camera and extracting a video frame image;
the contour extraction module is used for carrying out image preprocessing on the video frame image and carrying out contour extraction on the preprocessed image;
the human head identification module is used for performing curve fitting on the contour data matrix, judging whether the contour data matrix is a human head image according to the fitted curve contour area, performing inflection point analysis on the overlapped head image, performing secondary curve fitting, and counting the number of human heads in the elevator;
and the quantity display module is used for obtaining the number of the remaining loadable people of the elevator according to the difference value between the elevator threshold value and the number of the heads of the people in the elevator, uploading the number to the rear-end server, and the rear-end server displays the number of the remaining loadable people of the elevator on the elevator floor display screen.
6. The device of claim 5, wherein the camera covers an angle of 180 degrees and the width pixels of the human head target in the detection area are not less than 10 pixels.
7. The apparatus according to claim 5, wherein the curve fitting equation is:
Ax2+Bxy+Cy2+Dx+Ey+F＝0。
8. the device for displaying the number of people remaining in the elevator according to claim 5, wherein the number of people remaining in the elevator is the number of people in the elevator minus the number of heads of people in the elevator.
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