A vehicle device , comprising: a video acquisition unit configured to acquire videos captured by cameras (11, 11-1, 11-2,11-3, 11-4) configured to capture surroundings of a vehicle ; a light emission controller configured to control light emission of a light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) which is emitted by light emitting devices (14, 14-1, 14-2, 14-3, 14-4) and with which the ground or a floor surface is irradiated at predetermined positions (α-1, α-2, α-3, α-4) with respect to the vehicle ; an image processing unit configured to generate, using the videos acquired by the video acquisition unit , a bird's-eye view video including the light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) the light emission of which is controlled by the light emission controller ; and a superimposing image generation unit configured to generate a superimposing image included in the bird's-eye view video generated by the image processing unit wherein a position of the superimposing image in the bird's-eye view video corresponds to a position of the light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) when the camera parameters used for generating the bird's-eye view video are correctly calibrated, wherein the image processing unit is further configured to superimpose the superimposing image generated by the superimposing image generation unit on the bird's-eye view video, and the vehicle device further comprises an image determination processing unit configured to detect, in the bird's-eye view video on which the superimposing image generated by the superimposing image generation unit is superimposed by the image processing unit , an overlapping portion of the superimposing image and the light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) included in the bird's-eye view video to determine whether camera parameters for generating the bird's-eye view video are accurately calibrated. a video acquisition unit configured to acquire videos captured by cameras (11, 11-1, 11-2,11-3, 11-4) configured to capture surroundings of a vehicle ; a light emission controller configured to control light emission of a light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) which is emitted by light emitting devices (14, 14-1, 14-2, 14-3, 14-4) and with which the ground or a floor surface is irradiated at predetermined positions (α-1, α-2, α-3, α-4) with respect to the vehicle ; an image processing unit configured to generate, using the videos acquired by the video acquisition unit , a bird's-eye view video including the light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) the light emission of which is controlled by the light emission controller ; and a superimposing image generation unit configured to generate a superimposing image included in the bird's-eye view video generated by the image processing unit wherein a position of the superimposing image in the bird's-eye view video corresponds to a position of the light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) when the camera parameters used for generating the bird's-eye view video are correctly calibrated, wherein the image processing unit is further configured to superimpose the superimposing image generated by the superimposing image generation unit on the bird's-eye view video, and the vehicle device further comprises an image determination processing unit configured to detect, in the bird's-eye view video on which the superimposing image generated by the superimposing image generation unit is superimposed by the image processing unit , an overlapping portion of the superimposing image and the light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) included in the bird's-eye view video to determine whether camera parameters for generating the bird's-eye view video are accurately calibrated. <EOS>