Image-capturing device having focus adjustment function, image creation method including focus adjustment function, and program product for image-capturing device having focus adjustment function

An image creation method comprising:

• receiving a ray bundle that has passed through an optical system by an image-capturing device, which comprises a micro-lens array and a plurality of groups of light reception elements arranged so as to respectively correspond to each of the micro lenses;
• setting a focus detection region for detecting a deviation amount of an image surface within an image of a photographic subject;
• detecting the deviation amount of an image surface by the optical system for the focus detection region on the basis of the plurality of received light signals;
• capturing the image of the photographic subject by the image-capturing device;
• and
• deciding whether or not the deviation amount of the image surface which was detected corresponding to the focus detection region is less than a predetermined value,
• wherein:
• when the decision was made that the deviation amount of the image surface is less than a predetermined value,
• selecting a portion of the plurality of received light signals corresponding to each of the micro lenses on the basis of the detected deviation amount of the image surface which was detected corresponding to the focus detection region;
• and creating an image on the basis of that selected portion of the received light signals;
• and
• when the decision was made that the deviation amount of the image surface exceeds the predetermined value, performing focus adjustment of the optical system.

A non-transitory computer-readable program product for causing a computer to execute:

• a step of receiving a ray bundle that has passed through an optical system by an image-capturing device, which comprises a micro-lens array and a plurality of groups of light reception elements arranged so as to respectively correspond to each of the micro lenses;
• a step of setting a focus detection region for detecting a deviation amount of an image surface within an image of a photographic subject;
• a step of detecting the deviation amount of an image surface by the optical system for the focus detection region on the basis of the plurality of received light signals;
• a step of capturing the image of the photographic subject by the image-capturing device;
• and
• a step of deciding whether or not the deviation amount of the image surface which was detected corresponding to the focus detection, region is less than a predetermine value wherein:
• when the decision was made that the deviation amount of the image surface is less than a predetermined value,
• a step of selecting a portion of the plurality of received light signals corresponding to each of the micro lenses on the basis of the detected deviation amount of the image surface which was detected corresponding to the focus detection region;
• and
• a step of creating an image on the basis of that selected portion of the received light signals:
• and
• when the decision was made that the deviation amount of the image surface exceeds the predetermined value, performing focus adiustment of the optical system.