Abstract: An image generation device calculates a projection conversion matrix serving as a first conversion information enabling conversion of coordinates of a captured image from a coordinate system of the image to a coordinate system of a vehicle, calculates a projection conversion matrix serving as second conversion information enabling conversion of coordinates of a reference range to be displayed on a display unit from the coordinate system of the vehicle to a coordinate system of the display unit, and makes an image generation unit generate a display target image using the projection conversion matrices.

Abstract: The present invention's modifying method for wood elements includes a step for soaking wood elements in one or a mixture of acetic anhydride, acetic acid, or chloroacetic acid; and a step for acetylating the impregnated wood elements in a gaseous phase. This method makes it possible to reduce the time required for the step of acetylating the wood elements, simplifies the process, reduces fabrication costs, and enables fabrication of a wood fiberboard having high dimensional stability.