Local multi-device fast spatial anchor point synchronization method for mixed reality and system

A local multi-device fast spatial anchor point synchronization method for mixed reality comprising following steps:

• S1:
• establishing a local network connection for multiple devices locate(in the local space to achieve data transmission between devices, using any one of the multiple devices as a host to create a local network, other devices as guests to join the local network created by the host;
• S2:
• synchronizing time between the host and the guest in the local network, wherein the guest and the host first exchange their respective local time stamps to each other, and then calculate the time offset between the local time stamp of the guest and the local time stamp of the host, according to the time offset to adjust and realize the time synchronization between the guest and the host;
• S3:
• performing the spatial anchor point synchronization between the host in the local network and the guest, and using a specific picture displayed on the display system of the host as the anchor point, wherein the guest scans the specific picture through the augmented reality picture tracking technology to obtain the second position and rotation of the image anchor point in the space coordinate system of the guest;
• the first position and rotation of the anchor point in the host space coordinate system under the same time stamp is requested to the host, and the guest obtains two position and rotation data as a pose pair, the guest scans the anchor point several times to obtain multiple pose pairs, and calculates the multiple pose pairs by the least square method, the third position and rotation of the origin of the space coordinate of the host in the space coordinate system of the guest are obtained, by resetting the origin of the space coordinate system of the guest to the third position and rotation, to make the position and rotation of the origin of the space coordinate system of the host and the guest the same, and the synchronization of the space coordinate system between the devices is completed;
• other guests may synchronize spatial coordinate systems with hosts in the local network, or with guests that have completed spatial coordinate systems synchronization in the local network.