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Computer reverse projection photogrammetry (CRPP) is a technique of using computer software to obtain information from images. Use of this process can facilitate the analysis of a computer animation that depicts the reconstruction of an accident. This paper defines several digital image analysis techniques with a focus on CRPP and illustrates methods of employing their procedures. Specific aspects of animation validation and a description of the information needed to accurately complete an analysis also are described. In addition to discussing specific types of animation validation, the computer software and hardware required to perform analyses for a variety of platforms are mentioned.

Three-dimensional digitization (3DD) is the technique of recording position data in an electronic format. This process is performed through the use of coordinate measuring machines (CMMs), a broad classification of instruments whose purpose is to record position data. This paper will introduce 3DD and describe the operational theory behind a variety of CMMs. Applications for 3DD in the field of traffic accident reconstruction will be discussed, as well as the advantages and disadvantages of 3DD over traditional methods. The process of measuring a vehicle with CMMs will be presented along with special survey techniques to more effectively use electronic surveying equipment. Lastly, the means of converting recorded data to usable form will be described and a partial list of manufacturers for CMMs and modeling software will be provided.