Image sensor color correction

A camera having at least three color input channel processing circuits, each of said color input channel processing circuits comprising:

• an adder with a corrected color channel output and an uncorrected color channel input;
• a noise reduction filter having a filter input coupled to said uncorrected color channel input;
• an input channel multiplier having an input coupled to an output of said noise reduction filter, an output of said input channel multiplier being coupled to an input of said adder;
• and
• at least two further multipliers with inputs respectively coupled to outputs of other noise reduction filters forming part of the other color input channel processing circuits, said two further multipliers having outputs coupled to inputs of said adder.

A method of correcting a digital color sampled signal comprising at least three color channels, the channels being a Red Channel, Green Channel and Blue channel, the method comprising the steps of:

• filtering uncorrected color sampled signals on each of said color channels to provide filtered channel sampled signals;
• multiplying said filtered channel sampled signals with selected coefficients to provide noise reduced signal samples of said uncorrected color sampled signals;
• and
• adding each of said uncorrected color sampled signals to selected said noise reduced signal samples to provide a corrected color sampled signal.