Analysis of pedestrian congestion
A method, system and computer program product are disclosed for providing a measure of pedestrian congestion in a given area. In one embodiment, the method comprises collecting data from a pedestrian moving in the area, and using the data to determine one or more specified parameters representing a pattern of movement of the pedestrian in the area. These specified parameters are used to determine a sinuosity of pedestrian traffic in the given area. In one embodiment, the pattern of movement is a walking pattern of the pedestrian, and the data collected from the pedestrian identifies a multitude of positions of the pedestrian's feet. In an embodiment, the specified parameters include a lateral gap between the feet of the pedestrian, and a length of a stride of the pedestrian. A sequence of values may be collected for each of these parameters.
1. A computer-implemented method of determining an increase in a walking pattern of a pedestrian to avoid obstacles on a path along which the pedestrian is walking, the method comprising:
a plurality of transceivers on the pedestrian generating data relating to the walking pattern of the pedestrian on the path; and
using said transceivers, over time, to measure distances between feet of the pedestrian; and wherein
the plurality of transceivers include a primary transceiver on a first foot of the pedestrian, and a secondary transceiver on a second foot of the pedestrian; and
the using said transceivers, over time, to measure distances between feet of the pedestrian includes
the primary transceiver transmitting a train of pulses PI at a frequency FI, and starting a timer count Tat each of selected ones of the pulses,
the secondary transceiver, upon receipt of one of the pulses PI from the primary transceiver, transmitting, after a fixed time delay t, a series of pulse P 2 at a frequency F 2 ,
at each of a multitude of times, the primary transceiver, upon reception of one of the pulses P 2 , recording a timer count T, and re-starting the timer count T at the next one of the pulses P 1 ,
using the timer counts T and the time delay Δt to determine a multitude of the distances d between the feet of the pedestrian, and
using said determined distances d to determine an increase in a distance the pedestrian walks on the path to avoid the obstacles.
2. The method according to claim 1 , wherein the using the timer counts T and the time delay Δt to determine a multitude of the distances d between the feet of the pedestrian includes:
determining a sinuosity s of the walking pattern of the pedestrian; and
using said sinuosity s to determine the distances d.
3. The method according to claim 2 , wherein the using the timer counts T and the time delay Δt to determine the distances d further includes determining the distances d using the equation: T=Δt+d/s.
4. The method according to claim 1 , wherein the using the timer counts T and the time delay Δt to determine a multitude of the distances d between the feet of the pedestrian includes recording the distances d in a table.
5. The method according to claim 4 , wherein the recording the distances d in a table includes the primary transceiver recording the distances d in the table.
6. The method according to claim 1 , wherein the time delay Δt is 0.1 μs.
7. The method according to claim 1 , wherein the using said determined distances d to determine an increase in a distance the pedestrian walks on the path to avoid the obstacles includes using the determined distances d to compute an average length L for a stride of the pedestrian.
8. The method according to claim 7 , wherein the using said determined distances d to determine an increase in a distance the pedestrian walks on the path to avoid the obstacles further includes using the determined distances d to compute a series (1 i } of lengths of the stride of the pedestrian.
9. The method according to claim 8 , wherein the using said determined distances d to determine an increase in a distance the pedestrian walks on the path to avoid the obstacles further includes computing a standard deviation for said pedestrian walking pattern, and using said standard deviation to compute the average length L for the stride of the pedestrian.
10. The method according to claim 9 , wherein:
using said determined distances d to determine an increase in a distance the pedestrian walks on the path to avoid the obstacles includes using the determined distances d to compute a series of lateral gaps between the feet of the pedestrian; and
the computing a standard deviation includes using said computed series of lateral gaps to compute said standard deviation.
11. A computer system for determining an increase in a walking pattern of a pedestrian to avoid obstacles on a path along which the pedestrian is walking, the computer system comprising:
a plurality of transceivers on the pedestrian to generate data relating to the walking pattern of the pedestrian on the path, the plurality of transceivers including a primary transceiver on a first foot of the pedestrian, and a secondary transceiver on a second foot of the pedestrian; and
said plurality of transceivers being configured for measuring, over time, distances between feet of the pedestrian; and including,
the primary transceiver transmitting a train of pulses PI at a frequency FI, and starting a timer
count T at each of selected ones of the pulses,
the secondary transceiver, upon receipt of one of the pulses PI from the primary transceiver, transmitting, after a fixed time delay t, a series of pulse P 2 at a frequency F 2 ,
at each of a multitude of times, the primary transceiver, upon reception of one of the pulses P 2 , recording a timer count T, and re-starting the timer count T at the next one of the pulses P 1 ,
using the timer counts T and the time delay At to determine a multitude of the distances d between the feet of the pedestrian, and
using said determined distances d to determine an increase in a distance the pedestrian walks on the path to avoid the obstacles.
12. The computer system according to claim 11 , wherein the using the timer counts T and the time delay Δt to determine a multitude of the distances d between the feet of the pedestrian includes:
determining a sinuosity s of the walking pattern of the pedestrian; and
using said sinuosity s to determine the distances d.
13. The computer system according to claim 12 , wherein the using the timer counts T and the time delay At to determine the distances d further includes determining the distances d using the equation: T=Δt+d/s.
14. The computer system according to claim 11 , wherein the time delay Δt is 0.1 μs.
15. The computer system according to claim 11 , wherein the using said determined distances d to
determine an increase in a distance the pedestrian walks on the path to avoid the obstacles includes using
the determined distances d to compute an average length L for a stride of the pedestrian.
16. A computer readable program product comprising: a computer readable medium having a computer program code tangibly embodied therein for determining an increase in a walking pattern of a pedestrian to avoid obstacles on a path along which the pedestrian is walking, the computer program code, when executed in a computer system, performing the following:
receiving, at the computer system, data from a plurality of transceivers on the pedestrian data relating to the walking pattern of the pedestrian on the path; and
using said transceivers, over time, to measure distances between feet of the pedestrian; and wherein
the plurality of transceivers include a primary transceiver on a first foot of the pedestrian, and a secondary transceiver on a second foot of the pedestrian; and
the using said transceivers, over time, to measure distances between feet of the pedestrian includes
the primary transceiver transmitting a train of pulses PI at a frequency FI, and starting a timer count Tat each of selected ones of the pulses,
the secondary transceiver, upon receipt of one of the pulses PI from the primary transceiver, transmitting, after a fixed time delay t, a series of pulse P 2 at a frequency F 2 ,
at each of a multitude of times, the primary transceiver, upon reception of one of the pulses P 2 , recording a timer count T, and re-starting the timer count T at the next one of the pulses P 1 ,
using the timer counts T and the time delay At to determine a multitude of the distances d between the feet of the pedestrian, and using said determined distances d to determine an increase in a distance the pedestrian walks on the path to avoid the obstacles.
17. The computer readable program product according to claim 16 , wherein the using the timer counts T and the time delay Δt to determine a multitude of the distances d between the feet of the pedestrian includes:
determining a sinuosity s of the walking pattern of the pedestrian; and using said sinuosity s to determine the distances d.
18. The computer readable program product according to claim 17 , wherein the using the timer counts T and the time delay At to determine the distances d further includes determining the distances d using the equation: T=Δt+d/s.
19. The computer readable program product according to claim 16 , wherein the time delay Δt is 0.1 μs.
20. The computer readable program product according to claim 16 , wherein the using said determined distances d to determine an increase in a distance the pedestrian walks on the path to avoid the obstacles includes using the determined distances d to compute an average length L for a stride of the pedestrian.