Image blending method and projection system

A projection system, wherein the projection system comprises a first projector and a second projector, wherein:

• the first projector comprises a first processor, a first input interface, a first connection interface, and a first projection module;
• and
• the second projector comprises a second processor, a second input interface, a second connection interface, and a second projection module,
• wherein the first processor is configured to instruct the first projection module to project a first image onto a projection surface according to a first image data, and the second processor is configured to instruct the second projection module to project a second image onto the projection surface according to a second image data, wherein an image of a first portion of the first image projected on the projection surface and an image of a second portion of the second image overlap with each other in an overlapping area on the projection surface,
• wherein the first processor is configured to render a first control pattern, and instruct the first projection module to project the first control pattern onto the first image,
• wherein the first processor is configured to adjust the first control pattern in the first image according to a first input operation applied to the first input interface, such that a first control pattern frame of the first control pattern matches a boundary of the overlapping area,
• wherein the first processor is configured to identify a position of a first non-overlapping area in the first image according to a position of the matched first control pattern frame, wherein the first non-overlapping area of the first image does not overlap the second image,
• wherein the second processor is configured to render a second control pattern, and instruct the second projection module to project the second control pattern onto the second image,
• wherein the second processor is configured to adjust the second control pattern in the second image according to a second input operation applied to the second input interface, such that a second control pattern frame of the second control pattern matches a boundary of the overlapping area,
• wherein the second processor is configured to identify a position of a second non-overlapping area in the second image according to a position of the matched second control pattern frame, wherein the second non-overlapping area of the second image does not overlap the first image,
• wherein the first processor and the second processor are each configured to adjust image parameters of all pixels of the first non-overlapping area and the second non-overlapping area according to the position of the first non-overlapping area and the position of the second non-overlapping area, such that a black-level brightness of a first non-overlapping image in the first no overlapping area of the first image and a black-level brightness of a second non-overlapping image in the second non-overlapping area of the second image correspond to a black-level brightness of an overlapping mage in the overlapping area,
• wherein in the operation of identifying the position of the first non-overlapping area in the first image by the first processor according to the position of the matched first control pattern frame,
• the first processor identifies, according to the position of the first control pattern frame in the first image, an area outside the first control pattern frame in the first image as the first non-overlapping area,
• wherein in the operation of identifying, by the second processor, the position of the second non-overlapping area in the second image according to the position of the matched second control pattern frame,
• the second processor identifies, according to the position of the second control pattern frame in the second image, an area outside the second control pattern frame in the second image as the second non-overlapping area.