马璁珑,张雯,王柳.加网参数与水印抗印刷攻击性能研究[J].包装工程,2022,43(7):269-274.
MA Cong-long,ZHANG Wen,WANG Liu.Screening Frequency and Watermarking Performance against Printing Attack[J].Packaging Engineering,2022,43(7):269-274. |
| 加网参数与水印抗印刷攻击性能研究 |
| Screening Frequency and Watermarking Performance against Printing Attack |
| 投稿时间：2020-07-14 |
| DOI：10.19554/j.cnki.1001-3563.2022.07.035 |
| 中文关键词: 数字水印 CMYK颜色空间 网线角度 全息图 |
| 英文关键词: digital watermark CMYK color space screen angle hologram |
| 基金项目:天津市艺术科学规划项目(D20026) |
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| 中文摘要: |
| 目的 为实现数字水印技术由数字版权保护到印刷品防伪领域的移植应用，考察水印对不同加网线数、网线角度的鲁棒性和不可见性。方法 以DWT域全息水印算法为例，将水印图像制成全息图后，嵌入到宿主图像C、M、Y或K通道的DWT域，获得含水印图像，对含水印图像进行不同加网线数、网线角度的模拟加网实验。结果 实验表明，加网后水印的鲁棒性和不可见性随加网线数提升而提升，可接受的最低加网线数为120 lpi。相同加网线数条件下，网线角度为45°时，提取的水印质量较0°、15°和75°偏低。结论 45°加网角度虽然适合单色印刷，但是对水印造成的攻击也最为显著，因此应规避加网角度为45°的颜色通道作为水印嵌入位置。 |
| 英文摘要: |
| The work aims to investigate the robustness and invisibility of watermarks against different screening frequency and screen angles, so as to transplant digital watermarking technology from the field of digital copyright protection to printing anti-counterfeiting. With the holographic watermarking algorithm in DWT domain as an example, the watermarked image was made into a hologram and the hologram was embedded into the DWT domain of host image in C, M, Y or K layers, to obtain watermarked image. Simulation experiment was carried out to the watermarked image with different screening frequency and screen angles. The robustness and invisibility of watermarked image increased with the increase of the number of screening frequency. The lowest acceptable number of screen frequency was 120 lpi. Under the condition of the same number of screen frequency, the quality of extracted watermarks when the screen angle was 45° were lower than that at 0°, 15° and 75°. The screen angle of 45° is suitable for monochrome printing, but the watermark attack is the most significant. Therefore, the color channel with screen angle of 45° should be avoided as the watermark embedding position. |
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