Object counter and method for counting objects
AssigneeAxis AB
InventorJohan Almbladh
Life of this patent
Estimating the term…
Abstract
An object counter performs a method for estimating the number of objects crossing a counting boundary. The method comprising: capturing, during a time period, a plurality of images representing moving images; registering, from the captured images, motion region areas passing across the counting boundary; calculating the integral of the registered motion region areas for forming a resulting total motion region area; and estimating the number of objects that have crossed the counting boundary by dividing the resulting total motion region area by a reference area.
Claims17
A method for estimating the number of objects crossing a counting boundary, the method comprising:
- capturing, during a time period, a plurality of images representing moving images;
- registering, from the captured images, motion region areas passing across the counting boundary;
- calculating the integral of the registered motion region areas for forming a resulting total motion region area, wherein calculating the integral of the registered motion region area comprises summing area slices of motion regions from a plurality of the captured images;
- and
- estimating the number of objects that have crossed the counting boundary by dividing the resulting total motion region area by a reference area.
An object counter for estimating the number of objects crossing a counting boundary, said object counter comprising:
- an image sensor arranged to capture images of a predetermined counting view;
- a motion region detector arranged to, in the captured images, detect motion region areas passing the counting boundary;
- an area accumulator arranged to accumulate a total motion region by integrating the motion region areas detected by the motion region detector, wherein integrating comprises summing area slices of motion regions from a plurality of the captured images;
- and
- an object counting unit arranged to estimate the number of objects that have passed the counting boundary by dividing the total motion region area by a reference area.
An object counter for estimating the number of objects crossing a counting boundary, said object counter comprising:
- an image sensor arranged to capture images of a predetermined counting view;
- a motion region detector arranged to, in the captured images, detect motion region areas passing the counting boundary;
- an area accumulator arranged to accumulate a total motion region by integrating the motion region areas detected by the motion region detector;
- and
- an object counter unit arranged to estimate the number of objects that have passed the counting boundary by dividing the total motion region area by a reference area;
- and
- a processor configured to statistically infer the reference area by analyzing and estimating a quantization step in a number of measured total motion region areas from a large but unknown number of objects that have crossed the counting boundary.
An object counter for estimating the number of objects crossing a counting boundary, said object counter comprising:
- an image sensor arranged to capture images of a predetermined counting view;
- a motion region detector arranged to, in the captured images, detect motion region areas passing the counting boundary;
- an area accumulator arranged to accumulate a total motion region by integrating the motion region areas detected by the motion region detector;
- an object counter unit arranged to estimate the number of objects that have passed the counting boundary by dividing the total motion region area by a reference area;
- and
- a processor configured to estimate the reference area during a calibration step by comparing a total calibration motion region area, formed by registering from a plurality of captured calibration images calibration motion region areas passing across the counting boundary and calculating the integral of the registered calibration motion region areas, to a known number of objects that have crossed the counting boundary.
A method for estimating the number of objects crossing a counting boundary, the method comprising:
- capturing, during a time period, a plurality of images representing moving images;
- registering, from the captured images, motion region areas passing across the counting boundary;
- calculating the integral of the registered motion region areas for forming a resulting total motion region area;
- and
- estimating the number of objects that have crossed the counting boundary by dividing the resulting total motion region area by a reference area
- wherein the time period is determined as running until no motion region areas passing across the counting boundary is registered.
A method for estimating the number of objects crossing a counting boundary, the method comprising:
- capturing, during a time period, a plurality of images representing moving images;
- registering, from the captured images, motion region areas passing across the counting boundary;
- calculating the integral of the registered motion region areas for forming a resulting total motion region area;
- and
- estimating the number of objects that have crossed the counting boundary by dividing the resulting total motion region area by a reference area,
- wherein the reference area is inferred statistically by analyzing and estimating a quantization step in a number of measured total motion region areas from a large but unknown number of objects that have crossed the counting boundary.
A method for estimating the number of objects crossing a counting boundary, the method comprising:
- capturing, during a time period, a plurality of images representing moving images;
- registering, from the captured images, motion region areas passing across the counting boundary;
- calculating the integral of the registered motion region areas for forming a resulting total motion region area;
- and
- estimating the number of objects that have crossed the counting boundary by dividing the resulting total motion region area by a reference area,
- wherein the reference area is estimated during a calibration step by comparing a total calibration motion region area, formed by registering from a plurality of captured calibration images calibration motion region areas passing across the counting boundary and calculating the integral of the registered calibration motion region areas, to a known number of objects that have crossed the counting boundary.
Dependencies are inferred from the claim text.