Abstract: A method of calibrating a biometric device useful to measure a target dimension of a physiological tissue is provided comprising the steps of: measuring the target dimension of at least two samples of a reference material with the device to provide an actual output, wherein the reference material possesses at least one property of the tissue required for the function of the device and wherein each of the samples has a known target dimension; calculating a calibration equation based on the actual output of the device and the known target dimensions of the samples; and adjusting the actual output of the device according to the calibration equation to yield a corrected output. The calibration method provides a means of obtaining accurate tissue measurements. Also provided is a method of using a biometric device to measure a target dimension of a physiological tissue which incorporates calibration.

Abstract: A method of calibrating a biometric device useful to measure a target dimension of a physiological tissue is provided comprising the steps of: measuring the target dimension of at least two samples of a reference material with the device to provide an actual output, wherein the reference material possesses at least one property of the tissue required for the function of the device and wherein each of the samples has a known target dimension; calculating a calibration equation based on the actual output of the device and the known target dimensions of the samples; and adjusting the actual output of the device according to the calibration equation to yield a corrected output. The calibration method provides a means of obtaining accurate tissue measurements. Also provided is a method of using a biometric device to measure a target dimension of a physiological tissue which incorporates calibration.

Abstract: The invention provides an apparatus for measuring a hue of a predetermined primary color included in light reflected from a surface. The apparatus has a diffuse light source for creating incident light comprising a plurality of primary colors including the predetermined primary color, the incident light being directed onto the surface. The incident light is reflected from the surface to produce the reflected light. The apparatus also has a photometer for receiving and analyzing the reflected light to provide objective chromaticity data representing the hue of the predetermined primary color, and a scale adapted for converting the objective chromaticity data to a clinical score measuring the hue of the predetermined primary color in the reflected light.

Abstract: The invention provides an apparatus for measuring a hue of a predetermined primary color included in light reflected from a surface. The apparatus has a diffuse light source for creating incident light comprising a plurality of primary colors including the predetermined primary color, the incident light being directed onto the surface. The incident light is reflected from the surface to produce the reflected light. The apparatus also has a photometer for receiving and analyzing the reflected light to provide objective chromaticity data representing the hue of the predetermined primary color, and a scale adapted for converting the objective chromaticity data to a clinical score measuring the hue of the predetermined primary color in the reflected light.