Synchronous exposure method and image acquisition device

The invention discloses a synchronous exposure method and an image acquisition device. The image acquisition device comprises a depth camera and an RGB camera. The method comprises the steps that whena depth image begins to be transmitted after exposure of a depth camera, a signal channel pre-established between the depth camera and an RGB camera is used for sending a synchronization signal to the RGB camera, and the synchronization signal is used for controlling synchronous exposure of the RGB camera and the depth camera; and the RGB camera calculates an exposure starting moment by using thesynchronization signal, starts to expose when the exposure starting moment arrives and starts to transmit an RGB image after exposure, so that the depth camera and the RGB camera synchronously expose, and synchronous transmission of the RGB image and the depth image is realized. According to the technical scheme, the synchronous exposure function of the depth camera and the RGB camera can be completed, time alignment of t