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In recent years, there has been an increased interest in new digital holography techniques due to various reasons, such as the possibility of using low-cost and eye-safe light sources and new reliable spatial light modulators. One notable invention in incoherent imaging is the Fresnel incoherent correlation holography (FINCH), published in 2007. In FINCH, the self-interference principle and the signal processing capability of digital holography have been utilized innovatively to achieve super-resolution by violating the well-known law of the Lagrange Invariant. Today FINCH technique has been accepted and used as a resolution enhancer for various applications. In this direction of research, another incoherent digital holography technique called coded aperture correlation holography (COACH) has been recently developed. COACH can be considered as a generalization of FINCH but nevertheless has its own unique properties. COACH has been discovered as a flexible platform for a novel super-resolution imaging system and for an interferenceless imaging system. These recent developments indicate the potential of COACH to become an important player in future imaging technologies in many various applications. Considering the rapid development of COACH, FINCH, and other self-interference methods, a comprehensive review of the aperture engineering-based digital holography by self-interference and other methods is presented in the frame of the Spotlight Series. The evolution of this topic from 2007 to the very recent years is surveyed, and the various existing incoherent and coherent digital holography techniques are described in this comprehensive review.
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