Portable electronic device and operation method thereof

Abstract

Disclosed are a portable electronic device and an operation method thereof. The built-in image sensor of the portable electronic device continually captures a first image, detects whether there is a face image information in the first image, and accordingly determines whether to turn on a camera of the portable electronic device to capture a second image having a higher resolution. After that, the recognition module of the portable electronic device recognizes at least one facial feature in the second image.

What is claimed is: 
     
         1 . A portable electronic device, operating in a suspend state and a work state, comprising:
 a body;   an image sensor, in the suspend state continually capturing a first image outside the body and detecting whether there is a face image information in the first image, wherein the first image has a first resolution;   a camera, in the suspend state capturing a second image outside the body after the face image information is detected from the first image, wherein the second image has a second resolution and the second resolution is higher than the first resolution; and   a recognition module, recognizing at least one facial feature in the second image, wherein the portable electronic device enters the work state when the recognition module recognizes the correct facial feature.   
     
     
         2 . The portable electronic device according to  claim 1 , wherein the image sensor is switched to a power-saving mode after the portable electronic device enters the work state. 
     
     
         3 . The portable electronic device according to  claim 1 , wherein the camera is turned off when the portable electronic device operates in the suspend state and when there is no face image information detected by the image sensor from the first image. 
     
     
         4 . An operation method, applied to a portable electronic device, wherein the portable electronic device operates in a suspend state and a work state, and the portable electronic device comprises a body, an image sensor, a camera and a recognition module, the operation method comprising:
 in the suspend state, turning on the image sensor to continually capture a first image outside the body and to detect whether there is a face image information in the first image, wherein first image has a first resolution; and   turning on the camera to capture a second image outside the body after the face image information is detected from the first image, and recognizing at least one facial feature in the second image by the recognition module, wherein the second image has a second resolution and the second resolution is higher than the first resolution;   wherein the portable electronic device enters the work state when the recognition module recognizes the correct facial feature.   
     
     
         5 . The operation method according to  claim 4 , wherein the image sensor is switched to a power-saving mode after the portable electronic device enters the work state. 
     
     
         6 . The operation method according to  claim 4 , wherein the camera is turned off when the portable electronic device operates in the suspend state and when there is no face image information detected by the image sensor from the first image. 
     
     
         7 . A portable electronic device, comprising:
 a body; and   an image sensor, continually capturing a first image outside the body and detecting whether there is a first predetermined object or a second predetermined object in the first image, wherein when receiving a call, the portable electronic device determines to answer or decline the call according to whether there is the first predetermined object or the second predetermined object detected in the first image.   
     
     
         8 . The portable electronic device according to  claim 7 , wherein the portable electronic device is switched to a power-saving mode when the call is declined. 
     
     
         9 . The portable electronic device according to  claim 7 , further comprising:
 an on-hook controller, configured in the body, controlling the portable electronic device to go on-hook after the call is answered;   wherein the on-hook controller is activated to control the portable electronic device to go on-hook, after the call is answered and when there is a third predetermined detected by the image sensor in the first image.