A system includes an endoscope including a scope and an image sensor. The image sensor is configured to capture medical image data that includes effective image portion data and a mechanical vignetting portion data, the mechanical vignetting portion data of the medical image data being generated due to mechanical vignetting caused by a difference in the image sensor which generates the medical image data and the scope. There is also circuitry configured to determine evaluation information from image data which is from the effective image portion data, and execute a control process to at least partially control at least one of an autofocus processing, and an auto white balance processing on the endoscope on the basis of the evaluation information.