Electronic still video camera wherein a pre-exposure period is utilized to generate control signals of integrated values of the photoelectrically converted image signal to control both exposure and color balance

Electronic camera apparatus comprising:

• photoelectric conversion means for generating an electrical output image signal corresponding to a received image;
• processing means responsive to an output of said conversion means during a first, non-recording exposure period, to derive integrated correction values which are used to correct both an exposure period and color balance during a second, recording exposure period, said processing means deriving the integrated correction values by determining a difference between pre-non-recording exposure sample values and post-non-recording exposure sample values;
• exposure means for exposing said conversion means to the received image, said exposure means operating a first time during the first exposure period and a second time during the second exposure period;
• and
• correction means for correcting the exposure period and the color balance during the second exposure period.

Electronic camera apparatus comprising:

• photoelectric conversion means for producing an electrical image signal corresponding to a received image;
• color balance adjusting means connected to process the output of said photoelectric conversion means to alter the color balance thereof, said color balance adjusting means including color balance adjustment control means arranged to determine the amount of adjustment to be applied by the adjusting means, said color balance adjustment control means comprising means for reading the output of said conversion means during an initial non-recording exposure period, and for deriving from the read output integrated values for correcting an exposure period and a color balance in a subsequent recording exposure period, said color balance adjusting means deriving the integrated values by determining a difference between pre-non-recording exposure period sample values and post-non-recording exposure period sample values;
• and
• exposure means for exposing said conversion means, said exposure means operating a first time during the initial exposure period and a second time during the subsequent exposure period.

An electronic still video camera apparatus comprising:

• an image sensor for outputting an image signal;
• electrical signal processing means, coupled to receive an output of said image sensor, for deriving from said image signal, during an initial non-recording exposure period, integrated values for correcting an exposure period and color balance in a subsequent recording exposure period, said electrical signal processing means deriving the integrated values by determining a difference between pre-initial non-recording exposure period sample values and post-initial non-recording exposure period sample values;
• and
• exposure means for exposing said image sensor, said exposure means operating a first time during the initial exposure period and a second time during the subsequent exposure period.