The present invention provides a hologram apparatus for recording
interference fringes formed from reference light and signal light
optically spatially modulated by a spatial light modulator on a hologram
recording material or picking up an image of reproduction signal light
produced by irradiating illumination reproduction light on the hologram
recording material by means of an image pickup device to obtain a
reproduction image signal. The hologram apparatus includes a matching
data acquisition section, an arithmetic operation section, and a
positioning control section. The matching data acquisition section
directly picks up an image of the signal light optically spatially
modulated with a pixel matching pattern displayed on the spatial light
modulator by means of the image pickup device to obtain a reproduction
image signal. The arithmetic operation section performs predetermined
arithmetic operation using a luminance value of the reproduction image
signal. The positioning control section moves a relative position between
the image pickup device and the spatial light modulator in response to a
result of the arithmetic operation of the arithmetic operation section.