| 摘要 |
It is an object of the present invention to provide a camera apparatus that can keep the aperture within an appropriate range, and keep, within a designated range, the luminance of images to be taken over a long period of time. The camera apparatus comprises image providing means 11 for providing images corresponding to three primary colors in light by having light coming from an object passed therethrough, converting means 12 for converting the images into R-, G-, and B-image signals, continuous-change-in-amount-of-light means 13 for attaining continuous change in amount of light to be received by the converting means 12 through the image providing means 11, stepwise-change-in-amount-of-light means 14 for attaining stepwise change in amount of light to be received by the converting means 12 through the image providing means 11, gain adjusting means 15 for adjusting gains corresponding to the R-, G-, and B-image signals, and regulating the R-, G-, and B-image signals on the basis of the adjusted gains, luminance controlling means 16 for performing, in response to a luminance value calculated from the regulated R-, G-, and B-image signals, a control of a luminance of an image, and image signal outputting means 17 for outputting the regulated R-, G-, and B-image signals, wherein the luminance controlling means 16 includes a luminance deviation calculating unit for calculating a luminance difference between a predetermined reference value and the calculated luminance value, an amount-of-continuous-change judging unit for judging whether or not an amount of continuous change attained by the continuous-change-in-amount-of-light means 13 is in a predetermined range, a continuous control unit for controlling, on the basis of the luminance deviation, the continuous-change-in-amount-of-light means 13 when the amount of continuous change is in the predetermined range, and a stepwise control unit for controlling, on the basis of the luminance deviation, the stepwise-change-in-amount-of-light means 14 when the amount of continuous change is not in the predetermined range.
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