Contour rendering is one of the most influential factors with respect to the image quality of a laser projection television (TV). Herein, the just-noticeable differences of contour rendering for a laser projection TV are measured and determined using the two-alternative forced-choice method and the staircase 1-up 2-down method. Further, the influential factors with respect to the just-noticeable differences (JNDs) are analyzed, and the similarities and differences of contour rendering with respect to a laser projection TV and a liquid crystal display (LCD) TV are presented. The results denote that the JNDs are considerably affected by the texture features of the image in case of a laser projection TV. The values expressed by σ of one JND differ considerably in case of a laser projection TV and an LCD TV, and the differences between the adjacent JNDs are observed to be similar in case of both the TVs. Finally, a subjective image quality evaluation model, which is helpful for optimizing the image quality, can be established for a laser projection TV based on the experimental results and JNDs with respect to the image attributes, including the white level, black level, and color saturation.