Optimal tone scale mapping in electronic cameras

Details Optimal tone scale mapping in electronic cameras Optimal tone scale mapping in electronic cameras

H - Electricity

04

N

H04N 5/30 (2006.01) H04N 5/202 (2006.01)

Patent

CA 2221281

An improved electronic still imaging camera (10) is described wherein electronic voltage values representative of an image are transformed according to an optimum tone scale mapping gamma curve. The gamma curve utilizes a subjective element along with an element associated with scene reflectivity to optimize tone scale variations according to steps in an analog-to-digital (20) converter while reducing contouring in the image.

L'invention se rapporte à une caméra électronique améliorée (10) à images fixes, dans laquelle des valeurs de tension électronique représentatives d'une image sont transformées en fonction d'une courbe de correction gamma de représentation optimale d'échelles de luminances. La courbe de correction gamma met en oeuvre un élément subjectif ainsi qu'un élément associé à une réflectivité scénique afin d'optimiser les variations d'échelles de luminances en fonction des phases de conversion d'un convertisseur analogique-numérique (20) tout en réduisant le contour de l'image.

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