Patent ID: 6927799
Filing Date: 2005-08-09
Classification: H04N

Abstract:
1. An auto-strobe apparatus for a digital camera, comprising: an image sensor for capturing external images; an image processing circuit including an auto-exposure control circuit, an auto-white balance circuit, and a gamma setting circuit for setting an analog gain value, a digital gain value, and a gamma value, respectively, based on a brightness of the image captured by the image sensor; a flash module including a flash lamp for providing light source while taking a picture, a photo detector for detecting brightness when the flash lamp flashes and converting the detected brightness into a brightness voltage signal, and a comparator for comparing the brightness voltage signal with a variable reference voltage signal, so as to stop flashing the flash lamp when the brightness voltage signal is larger than the variable reference voltage signal; and a comparison voltage generator for generating the variable reference voltage signal based on the analog gain, the digital gain, and the gamma value.