Imaging System for Compensating for Mask Frame Misalignment

A system according to claim 11 wherein the image data processor generates said mask zoom factor Z according to the equation:

• Z=Mm/Mf
• where
• Mm is the individual determined zoom factor for the mask frame;
• and
• Mf is the individual determined zoom factor for the associated corresponding image frame.

A system according to claim 13 wherein the image data processor generates said respective image frame zoom factors Z according to the equation:

• Z=Mf/Mm
• where
• Mm is the individual determined zoom factor for the mask frame;
• and
• Mf is the individual determined zoom factor for the respective associated corresponding image frames.

A method for compensating for mask frame misalignment with non-mask frames in an image sequence, comprising:

• determining a compensation zoom factor for individual image frames of an image sequence in response to data indicating distance between an object and a radiation detector for said individual image frames,
• associating individual zoom factors with corresponding individual image frames of said image sequence,
• storing said individual zoom factors associated with corresponding individual image frames of said image sequence in a repository,
• applying an individual determined zoom factor to align an associated corresponding image frame and a mask frame to provide an aligned image frame;
• determining data representing an image difference frame comprising a difference between data representing said aligned image frame and a mask frame;
• and
• generating data representing a display image presenting said image difference frame.

A data storage device containing data representing executable code and associated data for performing a method for compensating for mask frame misalignment with non-mask frames in an image sequence, comprising:

• determining a compensation zoom factor for individual image frames of an image sequence in response to data indicating distance between an object and a radiation detector for said individual image frames,
• associating individual zoom factors with corresponding individual image frames of said image sequence,
• storing said individual zoom factors associated with corresponding individual image frames of said image sequence in a repository,
• applying an individual determined zoom factor to align an associated corresponding image frame and a mask frame to provide an aligned image frame;
• determining data representing an image difference frame comprising a difference between data representing said aligned image frame and a mask frame;
• and
• generating data representing a display image presenting said image difference frame.