1. A magnetocardiogram (MCG) system comprising: a sensor unit including M×M electromagnetic sensors producing a sparse measurement output of M×M data values, said sparse measurement output constituting a first MCG image; a high resolution MCG image synthesizer for receiving said first MCG image and producing a higher resolution image representation of said first MCG image, said higher resolution image representation being a second MCG image of higher pixel density than said first MCG image; and a de-noising image processing block for receiving said second MCG image and producing a de-noised lower resolution image representation of said second MCG image, said de-noised lower resolution image representation being a third MCG image having M×M picture elements within a physical sensor area corresponding to the span of said M×M data values of said first MCG image and having a reduced noise level as compared to said first MCG image.