Spectrophotometric camera
AssigneeVIE Group, LLC
InventorsMichael J Vrhel, Victor L Iseli
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Abstract
A spectrophotometric camera and method for measuring spectral energy in different wavelength bands at a plurality of locations are disclosed. The spectrophotometric camera comprises: a light source for sequentially producing light in different wavelength bands; an imaging device containing an array of sensors for detecting light at a plurality of locations; and a reference detector and an adjusting device for adjusting the light detected by the array of sensors. Spectral reflectance data from each of the plurality of locations on the surface of a target for each wavelength band in the plurality of light wavelength bands is measured. Spectral reflectance images are created, and features are extracted from the spectral reflectance images.
Claims35
A spectrophotometric system comprising:
- (a) a spectral energy source for sequentially producing spectral energy in different wavelength bands;
- (b) an imaging device including an array of sensors for detecting spectral energy;
- (c) a first spectral energy director for directing spectral energy produced by said spectral energy source onto a target surface;
- (d) a second spectral energy director for directing spectral energy reflected from the target surface to the array of sensors;
- (e) a reference detector for detecting changes in the spectral energy of each wavelength band produced by the spectral energy source;
- (f) a memory storing a set of calibration data representing irregularities in the spectral energy as detected by the array of sensors;
- and
- (g) an adjusting device coupled to the array of sensors, the reference detector, and the memory for adjusting the spectral energy detected by the array of sensors based on the changes in illumination detected by the reference detector and irregularities in the spectral energy as detected by the array of sensors represented by the set of calibration data stored in the memory.
A method for collecting spectral reflectance data from a plurality of locations on a surface, comprising:
- sequentially directing spectral energy in different wavelength bands onto a target surface;
- collecting the spectral energy reflected from the target surface in an image formed of a plurality of pixels;
- detecting irregularities in the collected spectral energy across the plurality of pixels;
- detecting changes in the spectral energy in the different wavelength bands directed onto the target surface;
- and
- adjusting the image formed by a plurality of pixels based on the detected changes in the spectral energy and the detected irregularities in the collected spectral energy.
Dependencies are inferred from the claim text.