This article examines the problem of obtaining three-dimensional images of an object using digital holography. Several methods based on holographic interferometry exist: the offset source method, the immersion method, the dual-wavelength method, and the use of a low-coherence illumination source. Each of the methods discussed has its own advantages and disadvantages. In most cases, quantitative information about the relief parameters is required. However, the poor quality of topographic fringes and the problem of determining the sign during relief determination cause significant difficulties in volume determination. These problems can be overcome by using a simple method of determining the volume using two stereo images reconstructed from holograms and subsequent refinement using one of the methods for obtaining holographic topographic maps. This paper demonstrates a method for determining a three-dimensional image using two stereo images of an object reconstructed from digital holograms. long exposure and development time, which is usually done separately from the optical setup. In the case of holographic interferometry systems, it is necessary to provide for mounting the hologram back into the optical setup with sufficiently high accuracy. Therefore, digital holography methods have been developed to record holograms on photomatrices with limited resolution. These methods are based on the use of optical schemes at small angles (less than 5 degrees) between interfering beams. Recently, sensors with a single element size of 1.33 µm and 0.56 µm have appeared. This resolution makes it possible to return to registration schemes with angles between interfering beams of 30-60 degrees. This allows us to hope for the revival of holographic methods and methods of holographic interferometry at the modern level without the use of intermediate recording media.

Keywords: obtaining holograms and reconstructing images from them, digital holography, spatial resolution of holograms, stereo images, reconstruction of volumetric images