素描笔的类型之一，能产生丰富的灰度变化
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本发明提供能够以低成本利用多灰度潜像的识别介质。
Provided is an identifying medium which can utilize a multi-tone latent image at a low cost.
本文研究了多灰度层次图象目标在复杂背境和噪声干扰下的多级检测技术。
In this paper, a multi-threshold progressive detection (MTPD) method of visible image objects in noisy complex background is studied.
针对此不足，提出一种基于多灰度图像真实性认证的直方图对无损数据隐藏新方法。
Therefore, a lossless data hiding scheme of histogram pair was proposed based on multi-gray image authenticity certification.
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