3d projection method and 3d projection device

A 3D projection device, comprising:

• an image processing device, configured to perform:
• obtaining a first eye image and a second eye image, and fusing the first eye image and the second eye image as a fusion image, wherein the fusion image comprises a plurality of pixel groups, and each of the plurality of pixel groups comprises a first pixel, a second pixel, a third pixel, and a fourth pixel;
• generating a first projection image based on the first pixels of the plurality of pixel groups;
• generating a second projection image based on the second pixels of the plurality of pixel groups;
• generating a third projection image based on the third pixels of the plurality of pixel groups;
• generating a fourth projection image based on the fourth pixels of the plurality of pixel groups;
• and
• an image shifting device, coupled to the image processing device and configured to perform:
• sequentially projecting the first projection image, the second projection image, the third projection image, and the fourth projection image, wherein the first projection image and the third projection image correspond to the first eye image, the second projection image and the fourth projection image correspond to the second eye image, the first eye image is one of a left eye image and a right eye image, and the second eye image is another one of the left eye image and the right eye image.