Abstract: 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.

Abstract: The invention is applicable to an apparatus which receives a sequence of character-representative signals and which generates stroke signals that are suitable for controlling a scanned display to present the sequence of characters on the display. This type of system typically includes timing generator means for generating timing signals which are synchronized with the display scan and character storage means for storing the character-representative signals and periodically reading out character-representative signals which correspond to a character in the sequence. This type of apparatus also typically includes stroke generating means responsive to the timing signals and the character-representative signals for producing a stroke of a character to be displayed. In accordance with the invention there is provided a system for presenting predetermined adjacent characters in overlapping positions on the display.