Abstract: A method includes capturing, via a camera that is inserted into a cavity, a first image of a surface defining the cavity and compressing the first image, using a compression algorithm, to generate a first feature vector. The method also includes identifying a second feature vector of a plurality of second feature vectors that best matches the first feature vector. The plurality of second feature vectors was generated by compressing second images of the surface using the compression algorithm. The second images were captured prior to insertion of the camera into the cavity and prior to capturing the first image. The method also includes generating, using the second feature vector, output indicating a position and/or an orientation of the camera as the camera captured the first image.

Abstract: A system for the optical measurement of pH includes a light emitter to emit an excitation light, and a detector coupled to receive florescence light produced by a compound in a mouth of a patient in response to the excitation light. A controller is coupled to the detector, and the controller includes logic that when executed by the controller, causes the system to perform operations. The operations may include emitting the excitation light from the light emitter; measuring an intensity of the florescence light emitted from a surface of individual teeth in a plurality of teeth in the mouth; and determining, based on the intensity of the florescence light, one or more locations on the individual teeth likely to develop demineralization.

Abstract: A system for the optical measurement of pH includes a light emitter to emit an excitation light, and a detector coupled to receive florescence light produced by a compound in a mouth of a patient in response to the excitation light. A controller is coupled to the detector, and the controller includes logic that when executed by the controller, causes the system to perform operations. The operations may include emitting the excitation light from the light emitter; measuring an intensity of the florescence light emitted from a surface of individual teeth in a plurality of teeth in the mouth; and determining, based on the intensity of the florescence light, one or more locations on the individual teeth likely to develop demineralization.