1. A distance image acquisition apparatus comprising: a projector which projects a first pattern of structured light distributed in a two-dimensional manner with respect to a subject within a distance measurement region in a plurality of wavelength bandwidths; a camera which is provided in parallel with and apart from the projector by a baseline length, performs imaging with sensitivities to the plurality of wavelength bandwidths, and generates a plurality of captured images including the first pattern reflected from the subject and corresponding to the plurality of wavelength bandwidths; and a processor configured to: determine whether or not a second pattern of structured light projected from another distance image acquisition apparatus is included in the captured images; extract the first pattern from at least a captured image determined as the second pattern being not included; and acquire a distance image indicating a distance of the subject within the distance measurement region based on the first pattern extracted, wherein the first pattern and the second pattern are dot patterns, and in a case where the number of dots of a dot pattern in the captured image exceeds the number of dots of the first pattern projected from the projector, the processor determines that the second pattern is included in the captured image.