Method of measuring display delay of camera and display delay measurement apparatus

A method of measuring a display delay comprising:

• a first step in which in response to times, a first display device performs a switching operation of switching a display pattern displayed on a display unit of the first display device;
• a second step in which during the execution of the switching operation, a first camera as being a target for measurement captures a first image containing the display unit of the first display device, and displays the first image in a live view mode on a display unit of the first camera;
• a third step in which a second camera captures a second image containing the first image displayed on the display unit of the first camera, and records at least the first image contained in the captured second image in a recording medium while being correlated with information indicative of an imaging time when the second image is captured;
• and
• a fourth step in which a display delay time of the first camera from the imaging of the first image to the display of the first image is deduced from the time indicated by the display pattern contained in the first image stored in the recording medium, and the information indicative of the imaging time.