DEVICE AND METHOD TO DISPLAY A BODY ILLUMINATED BY AN ADJUSTABLE RADIATION SOURCE

摘要

An adjustable source of radiation that is directable at a body to be imaged. Means are provided for converting radiation received from the body into an electronic video signal. A motion detector generates a motion-indicative signal as a function of differences between present and past video signal levels at elemental positions of the video frame. Control signal generating means are provided for generating a control signal as a function of said motion-indicative signal. The control signal is applied to the source of radiation to control the intensity thereof. In the preferred embodiment of the invention, the motion detection means comprises a portion of a video noise reduction system through which the video signal is processed before the display thereof. In this preferred embodiment the control signal generating means is operative to accumulate the motion-indicative signal over a substantial period of time, preferably at least one video frame, and to generate the control signal as a function of the motion-indicative signal. In this embodiment, the control signal can be used for automatic adjustment of the noise reduction system as well as for automatic adjustment of the intensity of the source of radiation.