Methods and systems are provided for determining the location of procedure sites, for example hair implantation sites, the method and systems enabling a natural looking randomness to be maintained to achieve a desired density while avoiding previously created procedure sites and existing features.本案提供用於判定程序部位例如毛髮植入部位之位置的方法及系統,該方法及系統使得能夠保持自然外觀隨機性,以便在避免先前產生程序部位及現有特徵的同時達成所需密度。