Seam inspection device

A seam inspection device comprising:

• a camera that shoots a sewing object supported by a throat plate of a sewing machine and having seams formed therein;
• and
• a computer including a memory that stores instructions, and a central processing unit configured to execute the instructions to perform a method including:
• acquiring an image of the sewing object from the camera that shoots the sewing object;
• performing image processing on the acquired image;
• calculating a detected feature amount of the seam, wherein the detected feature amount includes an area defined on a surface of the sewing object by the seams;
• storing a reference feature amount of the seam in a reference feature amount storage unit, wherein the reference feature amount includes an abnormal area greater than a normal area defined on the surface of the sewing object by the seams;
• and
• detecting an abnormality of the seams based on the acquired image of the sewing object by determining whether there is a pattern of abnormality of the seam by collating the detected feature amount with the stored reference feature amount,
• wherein determining whether there is the pattern of abnormality of the at least one seam includes determining whether the abnormality is a third pattern in which a sewing thread becomes slack on the surface of the sewing object.