Electronic device and method for measuring heart rate based on infrared rays sensor using the same

1. An electronic device comprising:

an infrared rays (IR) sensor;

a memory; and

a processor electrically connected to the IR sensor and the memory,

wherein the memory stores instructions which, when executed, cause the processor to:

receive an image using the IR sensor,

recognize, in response to a request for user authentication, an iris of a user using the IR sensor,

detect an object from the received image,

extract features of the detected object,

determine at least one region of interest (ROI) for measuring a heart rate (HR) based on the extracted features of the object,

identify whether measurement of the HR is possible in the ROI, and

complete the user authentication based on information of the iris if the measurement of the HR is possible even if the surroundings are darkened.

2. The electronic device of claim 1 , wherein the instructions cause the processor to extract locations of eyes, a nose, a mouth, and a forehead of a user as the features if a user's face is included in the received image.

3. The electronic device of claim 1 , wherein the instructions cause the processor to:

determine the HR of the user based on the determined ROI if the ROI is determined to correspond to the authenticated user, and

store the at least one determined ROI in the memory to correspond to the authenticated user if the ROI is not determined to correspond to the authenticated user.

4. The electronic device of claim 1 , wherein the instructions cause the processor to:

measure a noise that occurs in the at least one ROI,

exclude the ROI from a candidate group of ROI in which measurement of the HR is possible if the measured noise exceeds a predetermined threshold value, and

determine the HR based on the candidate group of ROI in which the measurement of the HR is possible.

5. The electronic device of claim 1 , wherein the instructions cause the processor to:

receive data for measuring the HR from the at least one determined ROI,

convert the received data into HR data, and

determine the converted HR data as the HR.

6. The electronic device of claim 1 , wherein the instructions cause the processor to:

receive data that corresponds to an image change in the at least one determined ROI, and

convert the received data into the HR to determine the HR.

7. The electronic device of claim 1 , wherein the instructions cause the processor to control a quantity of light of the IR sensor based on a use purpose of the IR sensor and a distance between an object and the IR sensor.

8. The electronic device of claim 1 , wherein the IR sensor is composed of any one of a sensor that includes both a light emitting unit and a light receiving unit, a sensor built in a camera, or a sensor in which a sensor that is a light emitting unit and a camera that is a light receiving unit are associated with each other.

9. A method for determining a heart rate (HR) using an infrared rays (IR) sensor, the method comprising:

receiving an image using the IR sensor;

recognizing, in response to a request for user authentication, an iris of a user using the IR sensor;

detecting an object from the received image;

extracting features of the detected object;

determining at least one region of interest (ROI) for measuring the HR based on the extracted features of the object;

identifying whether measurement of the HR is possible in the ROI; and completing the user authentication based on information of the iris if the measurement of the HR is possible even if the surroundings are darkened.

10. The method of claim 9 , wherein the extracting of the features of the object comprises extracting locations of eyes, a nose, a mouth, and a forehead of a user as the features if a user's face is included in the received image.

11. The method of claim 9 , further comprising:

determining the HR of the user based on the determined ROI if the ROI is determined to correspond to the authenticated user; and

storing the at least one determined ROI in a memory to correspond to the authenticated user if the ROI is not determined to correspond to the authenticated user.

12. The method of claim 9 , wherein the determining of the HR comprises:

measuring a noise that occurs in the at least one ROI;

excluding the ROI from a candidate group of ROI in which measurement of the HR is possible if the measured noise exceeds a predetermined threshold value; and

determining the HR based on the candidate group of ROI in which the measurement of the HR is possible.

13. The method of claim 9 , wherein the determining of the HR comprises:

receiving data for measuring the HR from the at least one determined ROI;

converting the received data into HR data; and

determining the converted HR data as the HR.

14. The method of claim 9 , wherein the determining of the HR comprises:

receiving data that corresponds to an image change in the at least one determined ROI; and

converting the received data into the HR to determine the HR.

15. The method of claim 9 , further comprising controlling a quantity of light of the IR sensor based on a use purpose of the IR sensor and a distance between an object and the IR sensor.