A projection method, adapted for a projection system comprising a first projector, a second projector, a third projector, and a fourth projector, wherein the projection method comprises:
- projecting, by the first projector, a first grid picture onto a projection surface, wherein the first grid picture comprises only one first right overlap region, only one first lower overlap region, and only one first intersection region, wherein the first intersection region is located at an overlap of the first right overlap region and the first lower overlap region, the first right overlap region is located on a first side of the first grid picture, the first lower overlap region is located on a second side of the first grid picture;
- projecting, by the second projector, a second grid picture onto the projection surface, wherein the second grid picture comprises only one second left overlap region, only one second lower overlap region, and only one second intersection region, wherein the second intersection region is located at an overlap of the second left overlap region and the second lower overlap region, the second left overlap region is located on a third side of the second grid picture, the second lower overlap region is located on a second side of the second grid picture;
- projecting, by the third projector, a third grid picture onto the projection surface, wherein the third grid picture comprises only one third upper overlap region, only one third right overlap region, and only one third intersection region, wherein the third intersection region is located at an overlap of the third upper overlap region and the third right overlap region, the third upper overlap region is located on a fourth side of the third grid picture, the third right overlap region is located on a first side of the third grid picture;
- projecting, by the fourth projector, a fourth grid picture onto the projection surface, wherein the fourth grid picture comprises only one fourth upper overlap region, only one fourth left overlap region, and only one fourth intersection region, wherein the fourth intersection region is located at an overlap of the fourth upper overlap region and the fourth left overlap region, the fourth upper overlap region is located on a fourth side of the fourth grid picture, the fourth left overlap region is located on a third side of the fourth grid picture, the first side and the third side are opposite sides, the second side and the fourth side are opposite sides;
- wherein an outer contour of the first grid picture is rectangular, entire area surrounded by the outer contour of the first grid picture is filled with grids of the first grid picture, an outer contour of the second grid picture is rectangular, entire area surrounded by the outer contour of the second grid picture is filled with grids of the second grid picture, an outer contour of the third grid picture is rectangular, entire area surrounded by the outer contour of the third grid picture is filled with grids of the third grid picture, an outer contour of the fourth grid picture is rectangular, and entire area surrounded by the outer contour of the fourth grid picture is filled with grids of the fourth grid picture;
- and
- moving the first grid picture, the second grid picture, the third grid picture, and the fourth grid picture to form a blended projection picture, wherein
- grid lines of the first right overlap region and the first lower overlap region are displayed in a first color, grid lines of the second left overlap region are displayed in a second color, grid lines of the second lower overlap region are displayed in the first color, grid lines of the third upper overlap region are displayed in the second color, grid lines of the third right overlap region are displayed in the first color, grid lines of the fourth upper overlap region and the fourth left overlap region are displayed in the second color, grid lines of the first intersection region and the fourth intersection region are displayed in a third color, and grid lines of the second intersection region and the third intersection region are displayed in a fourth color, wherein
- the first color and the second color are complementary colors, and the third color and the fourth color are complementary colors, so that when the blended projection picture is formed, every grid lines of overlap regions of the first to fourth grid pictures are displayed in a recognition color when the blended projection picture is formed,
- wherein the grid lines of the first right overlap region, the second left overlap region are overlapped with each other in the overlap region of the first grid picture and the second grid picture, the grid lines of the first lower overlap region, the third upper overlap region are overlapped with each other in the overlap region of the first grid picture and the third grid picture, the grid lines of the second lower overlap region, the fourth upper overlap region are overlapped with each other in the overlap region of the second grid picture and the fourth grid picture, the grid lines of the third right overlap region, the fourth left overlap region are overlapped with each other in the overlap region of the third grid picture and the fourth grid picture, and
- wherein numbers of grids of the first right overlap region and numbers of grids of the second left overlap region are the same with each other in the overlap region of the first grid picture and the second grid picture, numbers of grids of the first lower overlap region and numbers of grids of the third upper overlap region are the same with each other in the overlap region of the first grid picture and the third grid picture, numbers of grids of the second lower overlap region and numbers of grids of the fourth upper overlap region are the same with each other in the overlap region of the second grid picture and the fourth grid picture, numbers of grids of the third right overlap region and numbers of grids of the fourth left overlap region are the same with each other in the overlap region of the third grid picture and the fourth grid picture.