Patent ID: 8085341
Filing Date: 2011-12-27
Classification: H04N

Abstract:
1. A digital camera comprising: a battery configured to supply electric power; a battery level detector that detects a remaining voltage level of said battery when said digital camera is turned OFF, by detecting an actual remaining voltage level of the battery; a time detector that detects an elapsed time from an electric power OFF operation to an electric power ON operation, when said digital camera is turned ON; a remaining voltage calculator that calculates a remaining voltage level of said battery on the basis of the detected elapsed time, the detected remaining voltage level, and a discharge characteristic of said battery, when said digital camera is turned ON; and a boot controller that determines whether the calculated remaining voltage level is larger than a limited voltage necessary to boot the digital camera, and allows the digital camera to boot by performing a boot process when the calculated voltage level is greater than the limited voltage, and when the calculated remaining voltage level is determined to not be larger than the limited voltage, the battery level detector detects an actual remaining voltage level of the battery, and said boot controller determines whether the detected remaining voltage level is larger than the limited voltage and allows said digital camera to boot, by performing a boot process, when said boot controller determines that the detected remaining voltage level is larger than the limited voltage.