A projector control apparatus that causes plural projectors to collectively project an image by individually projecting a different one of segment images into which the image is divided, the apparatus including: a spatial distribution information obtaining unit which obtains information indicating a distribution of one or more viewers that view the image in a space where the projectors are mounted; a mode selecting unit which selects, using the information indicating the distribution of the one or more viewers, one of modes including (i) a first mode in which a width of a projection area is a first width and (ii) a second mode in which the width of the projection area is a second width larger than the first width; and a projector control unit which changes arrangement of the segment images by controlling each of projection directions according to the mode selected.

A projection system including a processing device and a first projector is provided. The first projector includes a first projection unit and a first image capturing unit. The first projection unit is configured to sequentially project a first reference image and a second reference image. The first image capturing unit is configured to sequentially obtain a first captured image and a second captured image. The processing device is adapted to compare the first captured image and the second captured image to obtain a position of an image region having a pixel value change among the first captured image and the second captured image. The processing device defines the position of the image region having the pixel value change as a valid identification region. In addition, an automatic setting method is also provided.

Image display apparatus and methods may use a single imaging element such as a digital mirror device (DMD) to spatially modulate plural color channels. A color channel may include a light steering element such as a phase modulator. Steered light from a light steering element may be combined with or replaced by additional light to better display bright images. These technologies may be provided together or applied individually.