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US 2010/0142777 A1Published application
Method and Device for Evaluating Fluorescence Image Records
AssigneeDüRr Dental SE
InventorMichael Thoms
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AssigneeDüRr Dental SE
InventorMichael Thoms
Estimating the term…
The invention relates to a method and a device for evaluating fluorescence partial images representing the same object region, independently of stray light. Two partial images of the objects are produced in the red and in the green by a camera (10). A quotient image is produced in pixels from said two partial images, and the frequency of the occurrence of the image points having a pre-defined red/green ratio is determined for said quotient image. The mean values and the width are determined for the distribution curve obtained in this way. The two end variables of the distribution curve are used to calculate a threshold value. The quotient image is modified using said threshold value such that its contrast in relation to interesting details is increased.
Method for evaluating fluorescence partial images of differing wavelength which are acquired by irradiation of a common point of an object by exciting light, wherein from the two partial images a quotient image is generated by pixel-by-pixel dividing of the pixel intensities of the two partial images, wherein for the quotient image a distribution curve is determined which specifies with which frequency a defined quotient occurs, wherein, depending on a width and/or a mean value of the distribution curve, a threshold value is determined, and wherein a diagnostic image is generated from the quotient image, in which the pixels of the quotient image are variably modified depending upon how their intensity lies relative to the threshold value, as a result of which a contrast image is obtained.
Dependencies are inferred from the claim text.