Abstract: An alignment, on a first projector, of a second projector, including: activating the projectors to project respective circles; transmitting projected image data from pictures of the projections to an analysis device that identifies respective centers of the projected circles and transmits adjustment commands the second projector to make the projected circle centers coincide. The analysis device: identifies at least one first and one second pair of projected-image zones, each zone of a pair including an arc of a circle, and the zones, pairwise, being spaced a maximum distance apart; identifies luminous intensity extrema in respective profiles of spatial distribution of luminous intensity; deduces spatial co-ordinates of points corresponding to said intensity extrema; defines spatial co-ordinates of the medium between the two points of the first pair and of the medium between the two points of the second pair, to deduce therefrom spatial co-ordinates of the center of the circle.

Abstract: An alignment, on a first projector, of a second projector, including: activating the projectors to project respective circles; transmitting projected image data from pictures of the projections to an analysis device that identifies respective centers of the projected circles and transmits adjustment commands the second projector to make the projected circle centers coincide. The analysis device: identifies at least one first and one second pair of projected-image zones, each zone of a pair including an arc of a circle, and the zones, pairwise, being spaced a maximum distance apart; identifies luminous intensity extrema in respective profiles of spatial distribution of luminous intensity; deduces spatial co-ordinates of points corresponding to said intensity extrema; defines spatial co-ordinates of the medium between the two points of the first pair and of the medium between the two points of the second pair, to deduce therefrom spatial co-ordinates of the center of the circle.

Abstract: A method for determining the operation of an image projector for projecting images onto a screen of a projection room. In particular, the method is implemented by computing means and comprises the following steps: driving the projector so as to project onto the screen a test card comprising a distribution of patterns of different hues, acquiring an image of the test card on the screen by a picture taking apparatus, and applying a processing of the image acquired, so as to determine at least one deviation of chrominance of the image acquired with respect to a predefined number of colors.