Wide dynamic range fusion using memory look-up

An image processing system, comprising:

• an image sensor, including an array of pixels that have units including rows and columns, arranged logically, each pixel including a CMOS active pixel sensor, including an in-pixel source follower, and in-pixel selector, each pixel also including a photoreceptor which produces an output signal indicative of image information that is applied thereto;
• a controller element on the same image substrate with said image sensor, and controlling outputs of said pixels;
• first and second register elements, respectively receiving output signals from said pixels, including at least a first register element holding an output of said pixel for a longer period of capture and a second register element holding an output of the same pixel for a shorter period of capture;
• a look-up table memory, storing information indicative of an image fusion between different kinds of results for long and short captures, said look-up table memory being addressed with information from said first and second registers and outputting an image fusion result based on contents of said first and second registers.

A method of determining fusion information, comprising:

• obtaining information about two different aspects of an image;
• converting said information into first and second digital words;
• obtaining a look-up table which is prestored with image fusion information based on said predetermined aspects;
• and
• using said first and second digital words to address the information in the look-up table to thereby read-out the information in the look-up table.