Abstract: A dental x-ray apparatus is provided that includes an x-ray system having an x-ray source and x-ray detection means; positioning means for positioning a patient's head in a predefined position with respect to the x-ray system; and at least one video camera for generating video images of the patient's head.

Abstract: A method is disclosed for enhancing the visibility of at least some features of a radiographic image, the features belonging to at least a first and a second category of features, the method including the steps of determining a histogram of the image, analyzing the histogram in order to determine a distinction between values of image elements that more likely show a feature of the first category and values of image elements that more likely show a feature of the second category, and applying a correction to at least some of the image elements, wherein an image element that, according to the determined distinction, more likely shows a feature of the first category is corrected differently than an image element that, according to the determined distinction, more likely shows a feature of the second category. An apparatus and a computer-readable data carrier are adapted for performing the above steps or for causing a processor to perform the above steps.

Abstract: Protective circuitry for a monolithic ROM is shown to include six monolithic FETS interconnected so that two comprise a resistance-capacitance series circuit responsive to a biasing voltage applied thereto to produce a time-varying voltage and the remaining four monolithic FETS are interconnected to form a latching circuit having a "high" output when the time-varying voltage is below a predetermined level and a "low" output thereafter as long as the biasing voltage is applied.