| 摘要 |
PROBLEM TO BE SOLVED: To facilitate measurement of a shutter time lag of a camera.SOLUTION: In a display section having i display elements, when j display elements are caused to be in a first display state and (i-j) display elements are caused to be in a second display state which is darker than the first display state, the i display elements are caused to be a m-th display pattern. After a pattern continuation time Thas elapsed, in the m-th display pattern, k display elements in the j display elements in the first display state are caused to be in the second display state, and in the m-th display pattern, k display elements in (i-j) display elements which are in the second display state are caused to be in the first display state. Thus, a switching operation is sequentially executed to switch i display elements into a (m+1)-th display pattern. The camera takes images of the display section which is in execution of the switching operation in accordance with a shutter operation made on the camera synchronously with the switching operation. Thus, a shutter time lag is calculated based on the images taken by the camera. |
