| 摘要 |
PROBLEM TO BE SOLVED: To photograph a subject without applying stress, caused by an environmental change, to the subject in underwater photographing that has various constraints of photographing conditions. SOLUTION: A subject distance L, the attenuation factorγof water, and the brightness B of background are measured and detected (S20 to S22). The attenuation of stroboscopic light (the brightness G of a strobe/(the attenuation factorγof light under water×the subject distance L)) is compared with the brightness (prescribed value) of the background of the subject expressed by (the brightness B of the background/a prescribed coefficientα), and the judgement is made whether it is smaller than the prescribed value or not (S23). If the brightness B is greater, the subject is not likely to glare. If the subject distance is long, it is less likely to glare due to the attenuation of stroboscopic light. Therefore, if the attenuation of the stroboscopic light is smaller than the prescribed value, emission of the stroboscopic light is permitted (S24). If the attenuation of the stroboscopic light is greater than the prescribed value, it is assumed that surroundings are dark and the attenuation of the stroboscopic light is small. In this case, emission of light is inhibited to prevent stress on the subject (S25). COPYRIGHT: (C)2007,JPO&INPIT
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