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尸体腐败或经福尔马林浸泡后,指纹干瘪、皱折、变形,给提取有鉴定价值的指纹带来一定困难。这种指纹肉眼观察纹线较清晰,但采用捺印或直接照相等方法,效果均不理想。笔者经过多次实验,用广角镜头直接对处理的手指进行拍照效果明显。广角镜头具有焦距短、景深长、视角大、物距短,同时有较高放大倍率的特点。本方法正是利用广角镜头这些特点,使手指中心及周围都有足够的景深,确保各部位纹线清晰。较高的放大倍率,可获得较大影像,达到近摄的目的。
After the body is corrupted or soaked in formalin, the fingerprint is shriveled, wrinkled and deformed, which brings some difficulties in extracting the fingerprints with the identification value. The fingerprints of the naked eye to observe the lines more clearly, but the use of Na or direct photo and other methods, the effect is not satisfactory. After many experiments, I use the wide-angle lens to deal with the finger directly to the effect is obvious. Wide-angle lens with a short focal length, depth of field, viewing angle, short object distance, while a higher magnification. This method is the use of these characteristics of wide-angle lens, the finger center and around have enough depth of field, to ensure that all parts of the clear lines. Higher magnification, get larger images, to achieve the purpose of close-up.