Apparatus and method for recognizing zone in portable terminal using earth magnetic field components and images
An apparatus and method for recognizing an indoor zone in which a user is located by using an Earth's magnetic field that is generated naturally instead of the conventional method of combining a magnetic field generator and a magnetic field sensor. The apparatus includes a zone evaluator configured to primarily recognize a location of the portable terminal by using first and second components of an Earth's magnetic field and to finally recognize the location of the portable terminal by using first and second images.
1. A portable terminal comprising:
a memory unit configured to store an Earth's magnetic field component corresponding to a predetermined zone for controlling a function of the portable terminal, and information of function to be executed at the predetermined zone; and
a controller coupled to the memory unit, the controller configured to:
control a sensor to acquire an Earth's magnetic field component corresponding to a current location of the portable terminal,
determine whether the portable terminal is located within the predetermined zone by comparing the acquired Earth's magnetic field component and the stored Earth's magnetic field component, and
if the portable terminal is located within the predetermined zone, execute a function corresponding to the predetermined zone in which the portable terminal is located.
2. The apparatus of claim 1 , wherein the portable terminal comprises:
an image acquisition unit to acquire an image corresponding to the predetermined zone in which the portable terminal is located; and
if determined that the portable terminal is located within the predetermined zone using the Earth's magnetic field, the controller is configured to determine whether the portable terminal is located within the predetermined zone by comparing the acquired image and prestored image of the predetermined zone predetermined zone corresponding to the current location of the portable terminal.
3. The apparatus of claim 2 , wherein the controller is further configured to acquire the Earth's magnetic field component by correcting a horizontal part of the portable terminal with respect to an Earth's horizontal plane.
4. The apparatus of claim 1 , wherein the Earth's magnetic field component is information corresponding to a location for zone recognition and include at least one of a horizontal intensity |H|, a vertical intensity |Z|, and an azimuth angle D which are determined by measuring the Earth's magnetic field.
5. The apparatus of claim 4 , wherein the Earth's magnetic field component corresponds to the Earth's magnetic field that is distorted by an indoor wall structure, arrangement of home appliances, and a metal- or ore-contained product, and changes negligibly over time and has a particular property depending on a location in an indoor zone, and the particular property is used in location recognition in the indoor zone.
6. A method of recognizing a zone of a portable terminal, the method comprising:
storing an Earth's magnetic field component corresponding to a predetermined zone for controlling a function of the portable terminal, and information of function to be executed at the predetermined zone;
acquiring an Earth's magnetic field component corresponding to a current location of the portable terminal;
determining whether the portable terminal is located within the predetermined zone by comparing the acquired Earth's magnetic field component and the stored Earth's magnetic field component; and
if the portable terminal is located within the predetermined zone, executing a function corresponding to the predetermined zone specific location in which the portable terminal is located.
7. The method of claim 6 , further comprising:
acquiring an image corresponding to the predetermined zone in which the portable terminal is located;
if determined that the portable terminal is located within the predetermined zone using the Earth's magnetic field, determining whether the portable terminal is located within the predetermined zone by comparing the acquired image and prestored image of the predetermined zone corresponding to the current location of the portable terminal.
8. The method of claim 7 , wherein the acquiring an image corresponding to the specific location in which the portable terminal is located is a process for obtaining the Earth's magnetic field component by correcting a horizontal part of the portable terminal with respect to an Earth's horizontal plane.
9. The method of claim 8 , wherein the Earth's magnetic field component is information corresponding to a location for zone recognition and includes at least one of a horizontal intensity |H|, a vertical intensity |Z|, and an azimuth angle D which are determined by measuring the Earth's magnetic field.
10. The method of claim 9 , wherein the Earth's magnetic field component corresponds to the Earth's magnetic field that is distorted by an indoor wall structure, arrangement of home appliances, and a metal- or ore-contained product, and changes negligibly over time and has a particular property depending on a location in an indoor zone, and the particular property is used in location recognition in the indoor zone.