Synchronous exposure method and image acquisition device

Abstract

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 the depth image and the RGB image is achieved, and image interframe dislocation caused by time accumulation is avoided.

Description

technical field [0001] The invention relates to a synchronous exposure method and image acquisition equipment. Background technique [0002] With the continuous development of current technology, people are constantly exploring new ways of human-computer interaction, especially in the biometric and automatic identification of machines. Recognition methods such as bone recognition and face recognition only rely on ordinary RGB images, which have many limitations in recognition accuracy and efficiency. Therefore, fusion based on depth cameras and RGB cameras is currently a better solution for machine recognition. [0003] The depth camera and the RGB camera need to complete the spatial alignment and time alignment of the two camera images during the image fusion process. The spatial alignment can complete the spatial correspondence between the two cameras through image calibration. For the time alignment of two common RGB cameras, a synchronization signal can be used to trigg...

AI Technical Summary

Problems solved by technology

However, for a depth camera and an ordinary RGB camera, due to the different imaging principles of the cameras, the exposure time cannot be unified. Using the same signal to complete the synchronization of the two cameras can trigger synchronous exposure, but it cannot To ensure subsequent transmission synchronization, due to the time difference caused by the difference in exposure and image transmission, the judgment conditions of each frame of image need to be set specifically according to the actual situation, which greatly increases the complexity of the design, and due to the widening of the time difference, frame loss occurs The probability of

At present, there is no mature synchronization solution for commercial depth cameras and RGB cameras, and the synchronization method for TOF depth cameras and RGB cameras is even blank

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