What does watermark mean?

[ shuǐ yìn ]

Watermark refers to the traditional method of engraving and painting with wood in China. Pigment is mixed with water, which does not contain oil. It is different from the general color printing method, so it is called "watermark" or "watermark woodcut". Now it also refers to translucent logo and icons added to pictures to prevent others from stealing pictures. Usually paper money, certificates, securities, food stamps, etc. All have watermarks to prevent counterfeiting.

Basic explanation

1.？ The mark you see in the light.

2.？ Refers to China's traditional method of woodcut printing and painting. Pigment is mixed with water and contains no oil, which is different from the general color printing method, so it is called "watermark". Also known as "watermark woodcut".

3.？ Refers to the translucent logo and icon added to the picture to prevent others from stealing the picture.

detailed description

1.？ Refers to China's traditional method of woodcut printing and painting. Pigment is mixed with water and contains no oil, which is different from the general color printing method, so it is called "watermark". Also known as "watermark woodcut".

Yao Yinxue's Li Zicheng, Volume II, Chapter 41: "Xin Li saw a watermark plum blossom poem under the mirror of Mrs. Tang." Sun Li's Xiu Lu Ji Hua Meng: "All the paintings I saw when I was a child were wooden watermarks."

2.？ Dialect. The official seal of the old shop.

3.？ Dialect. The official seal of the old shop.

Network explanation:

Watermark (Chinese vocabulary)

The watermark formed in the process of papermaking is "sandwiched" in the paper rather than on the surface of the paper. People, figures or characters with light and dark textures can be clearly seen under the illumination of light. It is made by changing the density of pulp fiber in the process of paper production. This method is usually used for RMB, shopping vouchers, food stamps, securities vouchers, etc. In order to prevent forgery.

Watermark sentence making

1. The businessman bought a machine for watermarking products.

2. Based on the model of detecting weak square wave signal in strong noise background with chaotic oscillator, a public key robust watermarking algorithm is proposed, which can disclose all details except the key.

3, dirty file grid watermark complete source code, has been tested.

4. Finally, the parity of quantized coefficients after uniform spectrum processing is adjusted to realize watermark embedding.

5. A domain audio watermarking algorithm based on auditory masking effect is proposed.

6. In the process of watermark detection using correlation detector, the original image is needed.

7. A method of embedding color digital watermark in gray image is proposed.

8. Calculate the masking threshold of each critical frequency band according to the auditory masking model, and then control the quantization step size according to the masking threshold of the watermark embedding point and the audio carrier value.

9. However, woodcut watermark is a traditional print creation form in China.

10. Using singular value decomposition in watermarking algorithm can improve the ability of resisting geometric distortion of images, but its ability of resisting salt and pepper, Gaussian and filtering attacks is very weak.