Method and apparatus for correcting color convergence error, and device

An apparatus for correcting a color convergence error, comprising:

• a projecting module, configured to control a projection system to project a first test pattern containing three sets of monochromatic test points and a second test pattern containing three sets of R, G, and B test points, to collect respectively a first projection image and a second projection image on the projection screen;
• wherein centers of three geometric figures by taking respectively the three sets of monochromatic test points as vertices superpose, and positions of the three sets of R, G, and B test points have a one-to-one correspondence with positions of the three sets of monochromatic test points;
• a coordinate calculating module, configured to acquire respectively a first center-of-mass coordinate and a second center-of-mass coordinate corresponding to projection image points on the first projection image and the second projection image;
• a noise calculating module, configured to calculate respectively color noises corresponding to R, G, and B according to the first center-of-mass coordinate and the second center-of-mass coordinate;
• a coordinate correcting module, configured to calculate color coordinates corresponding to the R, G, and B according to the color noises corresponding to the R, G, and B and the second center-of-mass coordinate;
• and
• an error correcting module, configured to adjust an assembly parameter of the projection system according to the color coordinates corresponding to the R, G, and B.