Alignment system, alignment method, and recording medium

An alignment method, comprising:

• acquiring a captured image from an imaging device to capture an image of a workpiece including an identification target;
• searching the acquired captured image and detecting the identification target;
• and
• providing a command to move the workpiece based on actual coordinates in a reference coordinate system that indicate a position of the detected identification target in the captured image,
• wherein acquiring the captured image includes
• when the identification target is detected in last-time detection, determining a transfer range of the captured image based on the actual coordinates of the identification target detected in a past, and issuing to the imaging device a transfer instruction specifying the transfer range,
• when first-time image capturing is performed or when the identification target is not detected in the last-time detection, issuing to the imaging device the transfer instruction specifying a full range of the captured image as the transfer range, and
• acquiring the captured image transferred from the imaging device based on the transfer instruction.

A non-transitory computer-readable recording medium storing a program executable by a computer in an alignment system to acquire a captured image of a workpiece including an identification target from an imaging device, to detect the identification target from the captured image, and to perform alignment control of the workpiece based on actual coordinates in a reference coordinate system that indicate a position of the detected identification target in the captured image, the computer being configured to perform image processing on the captured image, the program causing the computer to function as:

• an image acquirer to
• when the identification target is detected in last-time detection, determine a transfer range of the captured image based on the actual coordinates of the identification target detected in a past, and issues to the imaging device a transfer instruction specifying the transfer range,
• when first-time image capturing is performed or when the identification target is not detected in the last-time detection, issues to the imaging device the transfer instruction specifying a full range of the captured image as the transfer range, and
• acquire the captured image transferred from the imaging device based on the transfer instruction;
• and
• a searcher to search the captured image acquired by the image acquirer for the identification target.