Ghost detection device and imaging device using the same, ghost detection method and ghost removal method

An imaging device, comprising:

• a ghost detection device, comprising:
• a first imaging optical system having a first optical focal length F1 and a first imaging element of size S1;
• a second imaging optical system having a second optical focal length F2 and a second imaging element of size S2, where
• S1/F1≦S2/F2
• and the first and second imaging optical systems have different ghost appearance conditions under the same imaging conditions;
• and
• a ghost determining section which determines a shot portion by comparing a first image captured by the first imaging optical system and a second image captured by the second imaging optical system, in imaging ranges substantially equal to each other,
• wherein the ghost detection device detects a ghost generation position on a real-time basis.

A ghost detection method, comprising:

• an acquiring step of acquiring a first image captured by a first imaging optical system having a first optical focal length F1 and a first imaging element of size S1 and a second image captured by a second imaging optical system having a second optical focal length F2 and a second imaging element of size S2, where
• S1/F1≦S2/F2
• and the first and second imaging optical systems have different ghost appearance conditions under the same imaging conditions;
• a comparing step of comparing the first image and second image in imaging ranges substantially equal to each other;
• and
• a ghost determining step of determining, as a ghost portion, a portion of the first image having a luminance value difference equal to or larger than a predetermined value.