Apparatus and methods for detecting number of people waiting in an elevator hall using plural image processing means with overlapping fields of view

• US 5,298,697 A
• Filed: 09/21/1992
• Issued: 03/29/1994
• Est. Priority Date: 09/19/1991
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Suzuki, Masato, Nakata, Naofumi, Oonuma, Naoto, Nakamura, Kiyoshi, Inaba, Hiromi, Yamani, Hiroaki
• Primary Examiner(s): Skudy, Robert
• Assistant Examiner(s): NAPPI, ROBERT E
• Application Number:
  US07/948,255
• Time in Patent Office: 554 Days
• Field of Search: 187/131, 187/132, 358/136, 358/204, 382/41, 382/42
• US Class Current: 187/392
• CPC Class Codes: B66B 1/20 and for varying the manner of operation to suit particular traffic conditions, e.g. "one-way rush-hour traffic" B66B1/2466 takes precedence
• CPC Class Codes: B66B 1/3476 Load weighing or car passenger counting devices B66B5/14 takes precedence

Abstract

An apparatus for detecting people waiting for an elevator. A detecting unit detects the number of people waiting on the basis of an image from an image pickup unit and delivers that number to a corresponding second people waiting detecting unit. The apparatus includes a unit which generates a coefficient depending on a percentage of overlap of the field of view of a reference image pickup unit, which is one of several image pickup units, with the field of view of a different image pickup unit on the basis of data on the allocation of an elevator, and calculates the number of waiting people in the overall hall from the respective numbers of waiting people output from the plurality of image pickup units and those coefficients. The coefficient generating unit generates a maximum coefficient for the reference image pickup unit and a smaller coefficient for any remaining image pickup unit based on the of overlap of the field of view of the respective image pickup units. Thus, even if the fields of view of the plurality of image pickup units overlap, an accurate number of people waiting in the elevator hall, and free from an error in detection, is detected.

Claims

1. An apparatus for controlling operation of an elevator, based on detecting people waiting in an elevator hall, said apparatus comprising:

a plurality of image pickup devices for picking up a plurality of images of the elevator hall, each image pickup device picking up an image of a respective field of view of the elevator hall, the respective fields of view overlapping by a known amounts;

means for processing image signals from the plurality of image pickup devices to detect respective numbers of people waiting in each field of view;

means for generating a set of coefficients based on the amounts of overlap of the fields of view;

means for calculating the number of people waiting in the elevator hall, based on the generated coefficients and the respective detected numbers of people waiting in each field of view; and

means for controlling the operation of the elevator based on the number of people waiting.

2. An apparatus according to claim 1, wherein said coefficient generating means generates the coefficients further based upon a predetermined ratio of detected people waiting who enter an elevator.

3. An apparatus according to claim 1, wherein said coefficient generating means generates a reference coefficient for a selected one of said image pickup devices, and generates a coefficient for each of the remaining image pickup devices based upon the percentage of overlap of the respective field of view of said each of the remaining image pickup devices with the field of view of the selected image pickup device.

4. An apparatus according to claim 3, wherein said selected one of said image pickup devices is the image pickup device providing the image signal indicative of the maximum number of people waiting.

5. An apparatus according to claim 1, wherein said coefficient generating means is provided in said people waiting detecting means.

6. An apparatus according to claim 1, wherein said coefficient generating means is provided in said controlling means.

10. An apparatus according to claim 3 wherein said selected one of said image pickup devices is the image pickup device closest to an elevator to which said controlling means has allocated service.

7. A method of controlling an elevator, comprising the steps of:

(a) detecting respective numbers of people waiting in each of a plurality of fields of view in an elevator hall, the respective fields of view overlapping by known amounts;

(b) generating a set of coefficients based on the amounts of overlap of the fields of view;

(c) calculating the number of people waiting in the elevator hall, based on the generated coefficients and the respective detected numbers of people waiting in each field of view; and

(d) controlling the operation of the elevator, based on the calculated number of people waiting.

8. A method according to claim 7, wherein step (b) comprises generating a reference coefficient for a selected one of fields of view, and generating a coefficient for each of the remaining fields of view, based upon the percentage of overlap of the respective field of view of said each of the remaining image pickup devices with the field of view of the reference image unit.

9. A method according to claim 8, wherein the selected field of view is directly before an allocated elevator.

11. A method according to claim 8, wherein the selected field of view is the field of view for which the detected respective number of people waiting is a maximum.