In the coding scheme , this paper uses the coding method based on quad - tree partition , which increases the speed and veracity of the coding and is useful for object recognition . there are various flags during the quad - tree partition coding . in order to get the best coding , this paper alteres the flags , which include maximum recursion depth , minimum recursion depth , domain pool type , scaling bits , offset bits , number of iterations 這些參數包括有最小最大深度、 domain集類型、比例系數、偏移系數、匹配域類型;在解碼過程中,有迭代次數、比例系數、偏移系數,針對要編碼的圖像,調節以上參數,得到一組最佳參數,這樣,利用最佳參數可以達到最好的編碼質量,從而提高識別的效果。