Method for recognizing iris and electronic device therefor

1. An electronic device comprising:

an image sensor configured to obtain at least one image;

a light emitting module configured to emit infrared light; and

a processor configured to:

in response to receiving a request for authentication, identify iris recognition environment information using input information of the electronic device,

change at least one iris recognition parameter based on the iris recognition environment information,

control the light emitting module to emit infrared light based on the changed iris recognition parameter, and

perform iris recognition using the image obtained through the image sensor module.

2. The device of claim 1 , wherein the processor is configured to determine the iris recognition environment information using at least one of illuminance collected through the image sensor module, a shutter speed of the image sensor module, and a sensor sensitivity of the image sensor module, and

wherein the iris recognition environment information comprises information indicative of an indoor or outdoor environment.

3. The device of claim 1 , further comprising at least one sensor configured to sense illuminance, wherein the processor is configured to determine the iris recognition environment information using illuminance collected through the at least one sensor or the image sensor module, and

wherein the iris recognition environment information comprises information indicative of an indoor or outdoor environment.

4. The device of claim 1 , wherein the processor is configured to change at least one iris recognition parameter of an exposure time of the image sensor module, a light emission time of the light emitting module, a light emission intensity of the light emitting module, or an emission scheme of the light emitting module, based on the iris recognition environment information, and

wherein the infrared light emission scheme comprises at least one of a continuous wave scheme and a pulse scheme.

5. The device of claim 4 , wherein, in a case of an outdoor environment, the processor is configured to set the exposure time of the image sensor module to be relatively shorter than in an indoor environment, and set the light emission time of the light emitting module to be relatively longer than in the indoor environment, and

wherein, in a case of the indoor environment, the processor is configured to set the exposure time of the image sensor module to be relatively longer than in the outdoor environment, and set the light emission time of the light emitting module to be relatively shorter than in the outdoor environment.

6. The device of claim 1 , further comprising at least one sensor configured to estimate a distance between the electronic device and a user,

wherein the processor is configured to adjust a light emission amount of the light emitting module based on the distance between the electronic device and the user, which is estimated using the at least one sensor or the image sensor module, and the light emission amount of the light emitting module comprises at least one of a light emission time and a light emission intensity of the light emitting module.

7. The device of claim 6 , wherein, in response to adjusting the light emission amount of the light emitting module, the processor is configured to adjust the sensitivity of the image sensor module to correspond to the light emission intensity of the light emitting module.

8. The device of claim 6 , wherein the at least one sensor includes at least one of a proximity sensor, an illumination sensor, a distance measurement sensor of a Time Of Flight (TOF) scheme, and a depth sensor.

9. The device of claim 1 , wherein the processor is configured to identify a position of an iris image in the image obtained through the image sensor module, and adjust a light emission intensity of the light emitting module to correspond to the position of the iris image.

10. A method of an electronic device, comprising:

in response to receiving a request for authentication, identifying iris recognition environment information using at least one input information of the electronic device;

changing at least one iris recognition parameter based on the iris recognition environment information;

emitting infrared light based on the changed iris recognition parameter; and

performing iris recognition using an image obtained through an image sensor module.

11. The method of claim 10 , wherein the identifying the iris recognition environment information comprises:

identifying illuminance through at least one sensor configured to sense illuminance or the image sensor module; and

determining an indoor or outdoor environment in which the electronic device is located, using the identified illuminance.

12. The method of claim 10 , wherein the changing the iris recognition parameter comprises changing at least one iris recognition parameter of an exposure time of the image sensor module, an infrared light emission time, an infrared light emission intensity, and an infrared light emission scheme, based on the iris recognition environment information, and

wherein the infrared light emitting scheme comprises at least one of a continuous wave scheme and a pulse scheme.

13. The method of claim 12 , wherein the changing the iris recognition parameter comprises: in a case of an outdoor environment, setting the exposure time of the image sensor module to be relatively shorter than in an indoor environment and setting the light emission time of the light emitting module to be relatively longer than in the indoor environment; and

in a case of the indoor environment, setting the exposure time of the image sensor module to be relatively longer than in the outdoor environment and setting the light emission time of the light emitting module to be relatively shorter than in the outdoor environment.

14. The method of claim 10 , further comprising:

estimating a distance between the electronic device and a user; and

adjusting an emission amount of infrared light based on the distance between the electronic device and the user,

wherein the emission amount of infrared light comprises at least one of an infrared light emission time and an infrared light emission intensity.

15. The method of claim 14 , further comprising:

in response to adjusting the light emission amount of the light emitting module, adjusting the sensitivity of the image sensor module to correspond to the light emission intensity of the light emitting module.

16. The method of claim 14 , wherein the estimating the distance between the electronic device and the user comprises: estimating the distance between the electronic device and the user using at least one of a proximity sensor, an illumination sensor, a distance measurement sensor of a Time Of Flight (TOF) scheme, and a depth sensor.

17. The method of claim 10 , further comprising:

identifying a position of an iris image in the image obtained through the image sensor module; and

adjusting an infrared light emission intensity to correspond to the position of the iris image.

18. The method of claim 10 , wherein the identifying the iris recognition environment information comprises: determining the iris recognition environment information using at least one of illuminance collected through the image sensor module, a shutter speed of the image sensor module, and a sensor sensitivity of the image sensor module, and

wherein the iris recognition environment information comprises information indicative of an indoor or outdoor environment.