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用于辨认的照片应当是能充分反映出辨认对象的面貌特征,清晰逼真。然而在某些案件中碰到的往往不符合要求,影像模糊不清,无法直接用于辨认,必须经过一定的技术处理。在诸多方法之中“素描法”具有方便、快速、不受设备条件限制的特点,而且处理效果良好,对操作者的技术要求不高,只要具备一些美术基础一般都可胜任。所谓“素描法”是根据需要处理的照片或画像,利用铅笔、碳铅笔或其它单色工具在纸面上绘制画像。在保留形象基本特征的基础上加以补充、修改。因此有较高的准确性和可信性。如图一为某诈骗案犯罪嫌疑人做案后遗留的伪造身份证照片复印件。影像模糊不清,阴影部分的轮廓消失,五官轮廓残缺不全。同时,
The photos used to identify should be able to fully reflect the identification of the visual characteristics of the object, clear and vivid. However, in some cases, they often do not meet the requirements encountered, the image blurred, can not be directly used for identification, must go through certain technical processing. Among the many methods, “sketch method” has the characteristics of being convenient, rapid and not limited by equipment conditions, and the processing effect is good, and the technical requirements of the operator are not high, as long as there are some art basics in general can be competent. The so-called “sketch method ” is based on the need to deal with photos or portraits, the use of pencil, carbon pencil or other monochrome tools to draw a portrait on paper. On the basis of preserving the basic characteristics of the image, it should be supplemented and revised. So there is a high degree of accuracy and credibility. Figure 1 is a copy of the forged ID card left behind by the criminal suspect in a fraud case. Images blurred, the outline of the shadow disappeared, incomplete facial features incomplete. Simultaneously,