Method of pose tracking and device using the same

A method of generating a stable key frame for pose tracking, adapted to a head-mounted display, comprising:

• capturing a plurality of key frames during a time period, wherein the plurality of key frames are spatially correlated to each other, wherein the plurality of key frames comprises a first key frame;
• determining whether the first key frame is stable according to the plurality of key frames;
• in response to the first key frame being stable, determining the first key frame as a first stable key frame;
• and
• outputting the first stable key frame.

A portable device, comprising:

• a transceiver, communicatively connecting to a head-mounted display;
• and
• a processor, coupled to the transceiver, wherein the processor is configured to:
• receive a stable key frame from the head-mounted display;
• receive map data from the head-mounted display;
• determine whether the stable key frame is available according to information, wherein the information is obtained from the head-mounted display;
• and
• in response to the stable key frame being available, update a map for the pose tracking according to the stable key frame and the map data.

A head-mounted display, comprising:

• a transceiver;
• and
• a processor, coupled to the transceiver, wherein the processor is configured to:
• capture a plurality of key frames during a time period, wherein the plurality of key frames are spatially correlated to each other, wherein the plurality of key frames comprises a first key frame;
• determine whether the first key frame is stable according to the plurality of key frames;
• in response to the first key frame being stable, determine the first key frame as a first stable key frame;
• and
• output the first stable key frame via the transceiver.