Head wearable display reliability verification

A head wearable display (HWD) system comprising:

• an HWD,
• a position and orientation (P&O) tracker configured to track the P&O of the HWD, within a cockpit of an aircraft during flight of said aircraft, relative to at least one hardware element, wherein the at least one hardware element has a known position within a reference coordinate system, is selected from a surroundings of a user of the HWD, and is visible to the user through the HWD, and wherein the at least one hardware element comprises geometric shapes of cockpit hardware elements or aircraft parts outside the cockpit, which are visible and identifiable to the pilot during the flight;
• and
• a display reliability verification module configured to:
• calculate at least one position of the at least one hardware element with respect to the HWD;
• display, in the HWD and according to the tracked P&O of the HWD in the reference coordinate system, a graphical verification symbol for the at least one hardware element, wherein the graphical verification symbol is displayed whenever the user is determined as looking at the at least one hardware element, based on the P&O of the HWD, wherein as long as the P&O of the HWD is accurately tracked, each verification symbol appears to the user to be located at a same position as the at least one hardware element relative to said reference coordinate system;
• and
• advise the user of the HWD, whether the graphical verification symbols displayed by the HWD are presented conformally with respect to the real world, by indicating a degree of alignment between the graphical verification symbol and the at least one hardware element, wherein the degree of alignment between the graphical verification symbol in the reference coordinate system, with respect to the at least one hardware element indicates a degree of reliability of the HWD,
• wherein an area size of the at least one hardware element is larger than the area size of the graphical verification symbol.

An automated HWD reliability verification kit comprising:

• a camera affixed to a HWD and configured to capture at least one hardware element having at least one known position, wherein the at least one hardware element is selected from a surroundings of a user operating the HWD and is visible to the user through the HWD,
• an image processing module configured to process the captured images to derive respective at least one imaged location of the at least one hardware element,
• a position and orientation (P&O) tracker configured to track the P&O of the HWD and of the camera, and
• a display reliability verification module configured to calculate at least one position of the at least one hardware element with respect to the tracked P&O of the HWD and of the camera, calculate therefrom at least one expected imaged location of the at least one hardware element, and to indicate a discrepancy between the at least one derived imaged location and the at least one expected imaged location.