Product quantity determination apparatus, product quantity determination method, and non-transitory computer-readable medium

A product quantity determination method comprising,

• by a computer:
• acquiring a plurality of images generated by a camera including, in a capture range, a first area where a product of a payment target is located, and a second area different from the first area;
• processing the plurality of images, thereby determining a first number being the number of objects located in the first area, and determining a second number being the number of objects that have moved from the first area to the second area;
• and
• computing a third number being the number of the products, by use of the first number and the second number.

A non-transitory computer-readable medium storing a program that causes a computer to perform operations comprising:

• acquiring a plurality of images generated by a camera including, in a capture range, a first area where a product of a payment target is located, and a second area different from the first area;
• processing the plurality of images, thereby determining a first number being the number of objects located in the first area, and determining a second number being the number of objects that have moved from the first area to the second area;
• and
• computing a third number being the number of the products, by use of the first number and the second number.