Abstract: Apparatus and method of correcting for dark current in a solid state image sensor, include capturing an image with the image sensor to produce a digital image having pixel values; correcting the pixel values with a dark level correction value; employing a control system to adjust the dark level correction value to drive the number of pixels having values lower than a predetermined value chosen to represent dark scene content to a predetermined range.

Abstract: Apparatus and method of correcting for dark current in a solid state image sensor, include capturing an image with the image sensor to produce a digital image having pixel values; correcting the pixel values with a dark level correction value; employing a control system to adjust the dark level correction value to drive the number of pixels having values lower than a predetermined value chosen to represent dark scene content to a predetermined range.

Abstract: A method of enhancing a digital image that was transmitted with a reduced amount of digital data representing the digital image in which the differences between pixels in the digital image before compression are compared to corresponding pixels in a compressed version of the digital image and in which a statistical distribution of the differences is evaluated to determine which of the differences should be corrected. A receiver identifies portions of a received digital image that are to be enhanced, and a transmitter forms an error image for the identified portions. The amount of digital data in the error image may be reduced by selecting for transmission parts of the error image in which the amount of digital data that is needed to enhance the received digital image is less than a predetermined number of bits, the predetermined number of bits being selected from the distribution of the differences so as to enhance at least a predetermined percentage of the received digital image.