Method of measuring shutter time lag, display device for measuring shutter time lag, shutter time lag measurement apparatus, method of manufacturing camera, method of measuring display delay of camera, and display delay measurement apparatus

A method of measuring a shutter time lag of a camera using a display unit,

• wherein the display unit includes a plurality of display elements, and the plurality of display elements are grouped in such a manner that the same group includes the display elements close to each other in a predetermined direction, and each group includes a first type display element and a second type display element,
• wherein the method comprising:
• a first step of switching a display pattern of the display unit to a different display pattern at every time TP, and in the first step, at every time TP, among i (i is a natural number greater than 2) first type display elements of the group, the number of j (j is a natural number, and 1<j<i) first type display elements to be brought into a first display state is switched, and h (h is a natural number) second type display elements of the group display progress of the switching operation;
• a second step of capturing an image of the display unit in response to a shutter operation of the camera performed in synchronization with the switching operation, and the camera is disposed with respect to the display unit in such a manner that a movement direction of a shutter of the camera is parallel to the predetermined direction;
• and
• a third step of deducing a shutter time lag taken from the shutter operation to the imaging of the display unit from the image captured by the camera.

A method of manufacturing a camera comprising:

• a first step of switching a display pattern of a display unit including i (i is a natural number greater than 2) display elements to a different display pattern at every time TP, and in the first step, the number of j (j is a natural number, and 1<j<i) display elements to be brought into a first display state among i display elements is switched at every time TP;
• a second step of capturing an image of the display unit in response to a shutter operation of the camera performed in synchronization with the switching operation;
• a third step of deducing a shutter time lag taken from the shutter operation to the imaging of the display unit from the image captured by the camera;
• and
• a fourth step of sorting the camera satisfying a predetermined specification of the shutter time lag and the camera not satisfying the specification.