Abstract: Various embodiments are provided for evaluating a focus status of a camera. A reference image is stored in a memory based on first image data received from the camera. Second image data is received from the camera in accordance with a predetermined schedule. A focus status of a test image of the second image data is classified, and it is determined whether the camera is in a state of focus based on the focus status of the test image. A focus of the camera is changed when the camera is determined not to be in the state of focus. A new reference image is stored in the memory based on third image data received from the camera, with the third image data being received after changing the focus of the camera.