Patent ID: 6538242
Filing Date: 2003-03-25
Classification: H04N

Abstract:
A method of measuring spectral responsivity characteristic of image pick-up device comprising the steps of:(a) preparing an image pick-up device having an image sensor including plural pixels arranged, a light source, and a spectroscope for spectrally separating a light from said light source and outputting separated light from an emitting terminal thereof; (b) picking-up an image of said emitting terminal which is outputting said separated light by said image pick-up device; (c) performing a correction to each of plural image signals corresponding to at least one color component and said plural pixels that are outputted by said image pick-up device during said step (b) so that a gradation characteristic of said image pick-up device is corrected from non-linearity to one closer to linearity; and (d) calculating, as a spectral responsivity characteristic for said separated light, a mean value of said plural image signals after said correction by averaging the same over a certain range within said plural pixels, wherein said certain range is included in an image of said emitting terminal, and wherein, in varying a wavelength of said separated light, steps (b), (c), and (d) are repeatedly executed so as to obtain said spectral responsivity characteristic for plural wavelengths.