An image device adapted to control an image-capturing circuit and a display, the image-capturing circuit being configured to capture an image of a subject and generate image-capture data in synchronization with a first vertical synchronization signal, the display being configured to display an image on the basis of image data in synchronization with a second vertical synchronization signal, the image device comprising:
- an image-data-generation circuit configured to generate the image data on the basis of the image-capture data;
- and
- a timing generating circuit configured to output the first vertical synchronization signal and the second vertical synchronization signal, the second vertical synchronization signal being outputted after a predetermined period from a timing at which the first vertical synchronization signal is outputted, the predetermined period being shorter than a period of one cycle of the first vertical synchronization signal and being variable, and the first vertical synchronization signal and the second vertical synchronization signal being synchronized.