Light measuring device and camera

A light measuring device comprising:

• a) an integration-type light measuring sensor having a plurality of pixels and arranged to logarithmically compress a signal of light received by each pixel and to output the signal as a light measurement value for each pixel;
• b) a memory arranged to store an average of gain correction values for all pixels of said light measuring sensor, a deviation from the average of gain correction values obtained for each pixel of said light measuring sensor, a level correction value for each pixel of said light measuring sensor obtained for a reference integration period, and an amount of change of light quantity caused by a change of integration period;
• and
• c) a computing circuit arranged to compute, from the level correction value for each pixel and the amount of change of light quantity caused by a change of integration period stored in said memory, a level correction value for each pixel of said light measuring sensor for an integration period other than the reference integration period.

A camera comprising:

• a) an integration-type light measuring sensor having a plurality of pixels and arranged to logarithmically compress a signal of light received by each pixel and to output the signal as a light measurement value for each pixel;
• b) a memory arranged to store an average of gain correction values for all pixels of said light measuring sensor, a deviation from the average of gain correction values obtained for each pixel of said light measuring sensor, a level correction value for each pixel of said light measuring sensor obtained for a reference integration period, and an average of level shift amounts of all pixels of said light measuring sensor caused by a change of integration period;
• and
• c) a computing circuit arranged to compute, from the level correction value for each pixel and the average of level shift amounts of all pixels stored in said memory, a level correction value for each pixel of said light measuring sensor for an integration period other than the reference integration period.

A camera comprising:

• a) an integration-type light measuring sensor having a plurality of pixels and arranged to logarithmically compress a signal of light received by each pixel and to output the signal as a light measurement value for each pixel;
• b) a memory arranged to store an average of gain correction values for all pixels of said light measuring sensor, a deviation from the average of gain correction values obtained for each pixel of said light measuring sensor, a level correction value for each pixel of said light measuring sensor obtained for a reference integration period, and an amount of change of light quantity caused by a change of integration period;
• and
• c) a computing circuit arranged to compute, from the level correction value for each pixel and the amount of change of light quantity caused by a change of integration period stored in said memory, a level correction value for each pixel of said light measuring sensor for an integration period other than the reference integration period.