20120039592 | VIDEO CAMERA SUPPLEMENTARY WHITE LIGHT CONTROL METHOD - A video camera supplementary white light control method used in a video camera having installed therein a microcontroller, an image pickup device, a light sensor and a filter for controlling the operation of a supplementary lighting device that may be installed in the video camera or disposed outside the video camera. The method is to let the wavelengths beyond the overlapped area of the wavelength range sensed by the image pickup device and the wavelength range of the white light emitted by the supplementary lighting device be removed by the filter, so that the light sensor can receive a predetermined wavelength of light and compute the luminance of the received light, and the microcontroller can compare the luminance data to a reference data and then control the operation of the supplementary lighting device subject to the comparison result. | 02-16-2012 |