Relative exposure value measuring apparatus and method

Details Relative exposure value measuring apparatus and method Relative exposure value measuring apparatus and method

H - Electricity

04

N

H04N 9/69 (2006.01)

Patent

CA 2617773

Disclosed is a method which comprises the steps of providing a video-signal output device (4), accepting a brightness component of a video signal corresponding to a first position of a subject (1) which is imaged by the video--signal output device (4), correcting a gamma (y) value of the brightness component corresponding to the first position, accepting a brightness component of the image signal corresponding to a second position of the subject (1) which is imaged by the video-signal output device (4), correcting the gamma (y) value of the brightness component corresponding to the second position, calculating a ratio between the gamma--corrected brightness component corresponding to the first position and the gamma-corrected brightness component corresponding to the second position, and displaying the ratio.

La présente invention concerne un procédé comprenant les étapes consistant à fournir un dispositif de sortie de signal d'image (4) ; à fournir en entrée une composante de luminance de signal d'image correspondant à une première position d'objet (1) photographié par le dispositif de sortie de signal d'image (4) ; à corriger la valeur ? de la composante de luminance correspondant à la première position ; à fournir en entrée une composante de luminance du signal d'image correspondant à une seconde position (71) de l'objet (1) photographié par le dispositif de sortie de signal d'image (4) ; à corriger la valeur ? de la composante de luminance correspondant à la seconde position ; à calculer le rapport entre la composante de luminance correspondant à la première position après la correction gamma et la composante de luminance correspondant à la seconde position après la correction gamma ; et à afficher le rapport (72).

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