Imaging device and endoscopic diagnosis system

An imaging device for acquiring an image with a solid state image sensor, comprising

• a mask selector including a plurality of masks for defining a display region used when displaying an acquired image and selecting a mask according to an input instruction;
• a reduction level selector for selecting a halation reduction level according to an input instruction used when displaying said acquired image, light measuring means for obtaining a photometric value representing a whole brightness of said acquired image, and brightness adjusting means for adjust an imaging condition affecting the brightness of said acquired image based on said photometric value,
• wherein said light measuring means comprising;
• a comparator for comparing said brightness in a first region containing a center of said acquired image and a brightness in a second region closer to a periphery in said acquired image to obtain a luminance ratio between said first region and said second region,
• a photometric value calculator for calculating a mean luminance and a peak luminance of said acquired image, and mixing said mean luminance and said peak luminance using weighting factors such that, according to said luminance ratio, a weight given to said peak luminance increases as said brightness in said first region relative to the brightness in said second region increases to obtain a photometric value representing the whole brightness of said acquired image, and
• a condition setting unit for setting a peak luminance calculating condition and a weighting factor to use when said photometric value calculator obtains said photometric value, according to a combination of said selected mask and the halation reduction level.