目前，数字水印技术研究所选取的原始图像仍以灰度图像为主，这样就使得数字水印技术的应用范围受到极大的限制。
The current applied range of digital watermarking technique is limited greatly because the gray value images are widely selected as original images.
目前，数字水印技术研究所选取的原始图像仍以灰度图像为主，这样就使得数字水印技术的应用范围受到极大的限制。
The current applied range of digital watermarking technique is limited greatly because the gray value images are widely selected as original images.
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