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Abstract. Non-contact methods for estimating pig weight is popular in precision livestock farming utilizing computer vision techniques, and has proved success in field applications. The development of pigs‘ body size and body weight estimating based on machine vision can be generally divided into two stages: two-dimensional measurement phase and three-dimensional measurement phase. In this study, non-contact pig weighing methods from literatures were summarized. The advantages and limitations of each method were assessed by comparisons of weight estimation accuracy, maneuverability, and cost efficiency of the equipment.