Endoscope system, control method, and program

A control method comprising:

• by a control device that controls an imaging device to which a scope is connected and which receives light guided through the scope by an image sensor and captures an image,
• determining a size of an observation area different from a vignetting area generated on the image sensor by the scope at least twice or more to generate two or more consecutive determination results:
• comparing the two or more consecutive determination results;
• and
• in response to the two or more consecutive determination results being the same, performing parameter change processing based on the same consecutive determination results, and
• in response to the two or more consecutive determination results not being the same, maintaining a parameter previously used.

A non-transitory computer-readable medium storing a program for causing a computer to function as a control device, the control device:

• determining, at least twice or more, a size of an observation area different from a vignetting area generated on an image sensor by a scope connected to an imaging device that receives light guided through the scope by an image sensor and captures an image to generate two or more consecutive determination results,
• comparing the two or more consecutive determination results, and
• in response to the two or more consecutive determination results being the same, performing parameter change processing based on the same consecutive determination results, and
• in response to the two or more consecutive determination results not being the same, maintaining a parameter previously used.