Image processing device, control program, computer-readable storage medium, electronic apparatus, and image processing device control method

An image processing device having a function of calculating a position in a captured image pointed at with an image capture object by using image data for the captured image, said device comprising:

• gradient characteristic quantity calculation means for calculating concentration gradient characteristic quantities from the image data;
• correspondence degree calculation means for matching a matching region with a predetermined model pattern, the matching region being a region, around a target pixel, containing a predetermined number of pixels, and for calculating a number of pixels for which concentration gradient characteristic quantities contained in the matching region match concentration gradient characteristic quantities contained in the model pattern as an correspondence degree which is a degree of matching of the matching region with the model pattern;
• peak pixel search means for searching a search area containing a predetermined number of pixels around the target pixel for a peak pixel which is a pixel for which the correspondence degree calculated by the correspondence degree calculation means is a maximum;
• and
• coordinate calculation means for calculating the position in the captured image pointed at with the image capture object by using the correspondence degree for each pixel in a peak pixel region which is a region containing a predetermined number of pixels centered around the peak pixel found by the peak pixel search means.

A method of controlling an image processing device having a function of calculating a position in a captured image pointed at with an image capture object by using image data for the captured image, said method comprising:

• the gradient characteristic quantity calculation step of calculating concentration gradient characteristic quantities from the image data;
• the correspondence degree calculation step of matching a matching region with a predetermined model pattern, the matching region being a region, around a target pixel, containing a predetermined number of pixels, and of calculating a number of pixels for which concentration gradient characteristic quantities contained in the matching region match concentration gradient characteristic quantities contained in the model pattern as an correspondence degree which is a degree of matching of the matching region with the model pattern;
• the peak pixel search step of searching a search area containing a predetermined number of pixels around the target pixel for a peak pixel which is a pixel for which the correspondence degree calculated by the correspondence degree calculation means is a maximum;
• and
• the coordinate calculation step of calculating the position in the captured image pointed at with the image capture object by using the correspondence degree for each pixel in a peak pixel region which is a region containing a predetermined number of pixels centered around the peak pixel found in the peak pixel search step.