TWI512671B - Method for hidding visible data - Google Patents

Description

Visual information hiding method

The invention relates to a visual information hiding method, in particular to a visual information hiding method for embedding visual information into a device medium in an undetectable manner by a human eye.

The technology of digital media is based on the advancement of current hardware devices, and the speed of development is faster than ever. The main reason is that the usable electronic devices are becoming more and more popular, and it is more and more convenient to share the Internet after shooting. Cameras and actionable mobile electronic devices are the most commonly used shooting devices for current users. Most of the films and photos taken through the camera and the camera-capable mobile electronic devices are transmitted on the Internet through the convenience of the Internet. However, videos and photos circulating on the Internet often involve privacy and remake violations.

In order to solve the privacy and remake violations involved in videos and photos circulating on the Internet, most of the conventional methods are to add watermarking, which includes visual watermarking and invisible watermarking. Without the addition of watermarks, movies and photos can easily be reproduced, synthesized or modified by interested parties. Most of the general watermarks hide the trademark or image in the film and photos to confirm the ownership of the film and photos.

The advantage of visual watermarking is that it can be directly recognized by the human eye, and immediately achieves the declaration of ownership without complicated calculations. However, because it can be detected by the human eye, it can often be circumvented or removed by people with a heart. In addition, the visual watermark seriously causes image distortion and damages the readability of the media content. Invisible watermarking is often used to hide specific watermark images, or to ensure that images received by each other have not been tampered with when the images are transmitted. However, the technology of invisible watermarking cannot immediately declare the ownership of the media, and requires complicated operations, which is less suitable for use in low-computing mobile devices.

Therefore, if the image is greatly distorted or a lot of noise affecting the image is generated, the existence of the visual watermark is often lost, and it is very difficult to apply the invisible information to the mobile device. Therefore, the undetectable visual information hiding method still has room for improvement, and it is necessary to integrate the color characteristics that are not easily recognized by the human eye and needs further improvement.

In view of the above problems, the present invention proposes a visual information hiding method. Keep visual information hidden in the original image in a way that the human eye can't detect, and maintain the readability of the media content. After adjusting the histogram of the mobile device, the hidden visual information will be directly displayed on the image, providing visual information announcement of the device media.

The invention provides a visual information hiding method for hiding a visual watermark image in an original image, the watermark image having a pattern part and a blank part. The visual information hiding method includes the following steps: in the original image Determining at least one image embedding area. Next, the average value of the hue of the plurality of tones in the image embedding region is separately calculated. One of the plurality of tones is selected based on the average of the tones of the plurality of tones. In the image embedding area, determining whether the tonal value of the selected hue on the corresponding position of the pattern portion is less than or equal to a preset value, and if the hue value of the selected hue on the corresponding position of the pattern portion is greater than a preset value, the corresponding position of the pattern portion is The tone value of the selected hue is set to the preset value.

According to the above, in the image embedding region, it is determined whether the hue value of the selected hue at the corresponding position of the blank portion is greater than or equal to the hue average value of the hue, and if the hue value of the selected hue at the corresponding position of the blank portion is smaller than the hue of the hue The average value is set to the hue value of the selected hue at the corresponding position of the blank portion as the hue average value of the hue.

In an embodiment of the invention, the preset value and the hue mean of the hue differ by at least a threshold value. Wherein, the threshold value may be a value greater than or equal to 2.

In an embodiment of the invention, the at least one image embedding region is a maximum stable tone value region of the original image. The maximum tonal stability region is the three tones of the pixels in the image embedding region: the red pixel value, the green pixel value, and the blue pixel value, and the average total value of the variations of the three tones is selected as the largest region where the average total value difference is small.

In an embodiment of the invention, the red pixel average value, the green pixel average value, and the blue pixel average value of the embedded region are average values of respective pixels of red, green, and blue hue in the image embedding region.

In an embodiment of the present invention, in the step of determining whether the tonal value of the selected hue on the corresponding position of the pattern portion is less than or equal to the preset value, if the pixel of the selected hue at the corresponding position of the pattern portion is less than or equal to the preset value, Then, the tone value of the selected hue at the corresponding position of the pattern portion is not changed.

In an embodiment of the present invention, in the step of determining whether the tonal value of the selected hue at the corresponding position of the blank portion is greater than or equal to the hue average value of the hue, if the hue value of the selected hue at the corresponding position of the blank portion is greater than Equal to the hue average of the hue, the hue value of the selected hue at the corresponding position of the blank portion is not changed.

The invention provides a visual information hiding method for hiding a visual watermark image in an original image, the watermark image having a pattern part and a blank part. The visual information hiding method includes the following steps: determining at least one image embedding area in the original image. Next, the average value of the hue of the plurality of tones in the image embedding region is separately calculated. It is determined whether the average value of the tones of the plurality of tones is greater than or equal to a threshold value, and one of the plurality of tones is selected accordingly. If the average value of the hue of the plurality of tones is not greater than or equal to the threshold value, determining whether the hue value of the selected hue at the corresponding position of the pattern portion is greater than or equal to a preset value, and if the hue value of the selected hue is corresponding to the position of the pattern portion If it is less than the preset value, the tone value of the selected hue at the corresponding position of the pattern portion is set to the preset value.

According to the above, in the image embedding region, it is determined whether the hue value of the selected hue at the corresponding position of the blank portion is less than or equal to the hue of the hue The mean value is set to the hue value of the hue of the selected hue in the corresponding position of the blank portion if the hue value of the selected hue at the corresponding position of the blank portion is larger than the hue average value of the hue.

The visual information hiding method disclosed in the present invention hides the visual information in an area of the image in an undetectable manner by the human eye. When you want to display the imperceptible information in the image of the device, you only need to adjust the lower limit value or the upper limit value range of the hue histogram according to the threshold value and the average value of the hue, so that the hidden visual information can be displayed. The visual information hiding method can embed visual information in a color area of the original image that is less noticeable to the naked eye to maintain the readability of the image content and hide important visual information. When the visual information is displayed, the visual information can be clearly displayed through the adjustment of the histogram to declare the image information and avoid being synthesized or tampered with. In addition, only the licensor has the threshold value and the average value of the hue to display the hidden visual information, which can improve the confidentiality of hidden information.

The above description of the present invention and the following description of the embodiments are intended to illustrate and explain the spirit and principles of the invention, and to provide further explanation of the scope of the invention.

10‧‧‧ original image

11‧‧‧Image embedding area

12‧‧‧Watermark imagery

S201~S209‧‧‧Step procedure

S301~S309‧‧‧Step procedure

41‧‧‧ original image

42‧‧‧ original image

420‧‧‧First image embedding area

422‧‧‧Second image embedding area

424‧‧‧ Third image embedding area

43‧‧‧Watermark image embedded image

431‧‧‧Watermark image

432‧‧‧Watermark image

433‧‧‧Watermark image

44‧‧‧ Watermark image embedded image

441‧‧‧Watermark image

45‧‧‧Watermark image embedded image

451‧‧‧Watermark image

50‧‧‧ original image

501‧‧‧Image embedding area

51‧‧‧ Watermark image embedded image

511‧‧‧Watermark image

60‧‧‧ original image

601‧‧‧Image embedding area

61‧‧‧ Watermark image embedded image

611‧‧‧Watermark image

70‧‧‧ original image

701‧‧‧Image embedding area

71‧‧‧ Watermark image embedded image

711‧‧‧Watermark image

1 is a block diagram of a visual information hiding method in accordance with an embodiment of the present invention.

2 is a flow of a visual information hiding method according to an embodiment of the present invention. Cheng Tu.

3 is a flow chart of a visual information hiding method according to another embodiment of the present invention.

4a, 4b, 4c, 4d, and 4e are exemplary diagrams in accordance with an embodiment of the present invention.

5a and 5b are exemplary diagrams in accordance with another embodiment of the present invention.

6a and 6b are exemplary diagrams in accordance with still another embodiment of the present invention.

Figures 7a and 7b are exemplary diagrams in accordance with yet another embodiment of the present invention.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the invention. The objects and advantages associated with the present invention can be readily understood by those skilled in the art. The following examples are intended to describe the present invention in further detail, but are not intended to limit the scope of the invention.

Please refer to FIG. 1 and FIG. 2 together, FIG. 1 is a block diagram of a visual information hiding method according to an embodiment of the present invention, and FIG. 2 is a flow of a visual information hiding method according to an embodiment of the present invention. Figure. The visual information hiding method described in this embodiment is used to embed the watermark image 12 in the original image 10. The visual information herein refers to the watermark image 12, and the watermark image 12 has a pattern portion and a blank portion. As shown in the figure, a certain range of image embedding regions 11 can be circled or calculated in the original image 10, and the image embedding region 11 is used. To embed the watermark image 12. The original image 10 is, for example, an image file composed of pixels, such as an image of a Joint Photographic Experts Group (JPEG) format, a bitmap image of a Bit Map (BMP) format, or a mobile network. Road Networking Graphics (PNG), etc. In one example, the original image 10 can be a photo of a device medium (eg, in a digital camera) or a frame in a media movie.

In step S201, the embodiment first determines at least one image embedding region 11 in the original image 10. In practice, if the image embedding region 11 is the maximum hue stable region (or smooth region) of the original image 10, the image embedding region 11 can be selected. Those skilled in the art can select image embedding regions by other conditions, and the embodiment is not limited herein. In this embodiment, the image embedding region 11 may just be a square region. Of course, the image embedding region 11 may also select other shapes as needed.

For example, to obtain the maximum tonal stability region in the original image 10, any region that may be included in the original image 10 may be selected first. Next, each pixel of any region is compared one by one, and the alignment method first selects one of the red hue value, the green hue value, and the blue hue value of each pixel. The two-to-two comparisons are performed with the tonal values of the selected tones. Here, the red color tone value, the green color tone value, or the blue color tone value of each pixel are respectively the red intensity and green of each pixel. Strength and blue intensity can be an integer from 0 to 255.

After the comparison of the tonal values of the aforementioned tones, the region with the smallest average difference value may be the image embedding region 11 in the original image 10, the image embedding region may be as large as possible, or according to the watermark to be embedded. The image 12 size is selected. The red tonal value, the green tonal value, and the blue tonal value are the tonal values of the three primary colors formed by the image. The hue illustrated in this embodiment is based on the principle of the three primary colors, and the actual situation is not limited thereto.

The watermark image 12 can be a graphic, a text or other information, and is illustrated by a graphic additional text in this embodiment. In this embodiment, only one watermark image 12 is described, but the actual situation is not limited thereto. In order to correspond to the watermark image 12, the present embodiment is also described by only one image embedding region 11, but in practice, a plurality of image embedding regions 11 may be generated according to the maximum hue stable region or the next sub-large hue stable region.

In step S202, the present embodiment calculates the average value of the hue of the plurality of tones in the image embedding region 11, respectively. The plurality of hue may be red (R), green (G), and blue (B), and a plurality of corresponding hue average values are average values of red intensity, green intensity, and blue intensity in each pixel.

In step S203, one of the plurality of tones is selected according to the average of the tones of the plurality of tones. For example, in the present embodiment, the color tone can be selected according to the magnitude of the average value of the hue of each color tone. For example, the color tone having the largest or smallest hue average value can be selected, and the reason for selection will be described later. In an example, it may be further determined whether the average of the hue of the plurality of tones is greater than or equal to a threshold value to determine which hue is selected. In practice, When the average value of the hue of the hue is greater than or equal to the threshold value, the hue having the smallest hue average value in each hue is selected. When the hue average of the hue is less than the threshold value, the selection mode can be seen in the next embodiment.

In step S204, in the image embedding area 11, the present embodiment determines whether the hue value of the selected hue on the corresponding position of the pattern portion of the watermark image 12 is less than or equal to a preset value. For example, if the selected hue is red (R), then the embodiment determines the size of the red hue value of each of the pixels corresponding to the pattern portion in the image embedding region 11. If the hue value of the red color corresponding to the position of the pattern portion is greater than the preset value, then in step S205, the hue value of the red color corresponding to the position of the pattern portion is set to a preset value. On the other hand, if the hue value of the red color corresponding to the position of the pattern portion is less than or equal to the preset value, the red hue value at the corresponding position of the pattern portion is not changed as described in step S206.

On the other hand, in step S207, in the image embedding region 11, the present embodiment determines whether the hue value of red on the corresponding position of the blank portion is greater than or equal to the hue average value of red. If the hue value of the red color corresponding to the position of the blank portion is smaller than the hue average value of the red color, the hue value of the red color corresponding to the position of the blank portion is set to the hue average value of the red color as described in step S208. On the other hand, in step S209, if the red tonal value of the corresponding position in the blank portion is greater than or equal to the red tonal average value, the red tonal value at the corresponding position of the blank portion is not changed.

In a practical example, when the image embedding area 11 is determined, the color of the red, green, and blue colors in the image embedding area 11 is first calculated. The mean value is assumed to be 100, 150, and 200, respectively. At this time, the present embodiment selects red having the smallest hue average as the selected hue. Next, since the average value of the hue of the red in the image embedding region 11 is 100, the preset value can be set to 98. Here, the preset value (98) may be a hue average value (100) minus a threshold value (2). This embodiment does not limit the size of the threshold value, and is generally freely designed by those skilled in the art.

It should be noted that, because the preset value of the embodiment is the average value of the hue minus the threshold value, when the average value of the hue is less than the threshold value, the content disclosed in the embodiment cannot be applied, and the detailed implementation is as follows. Said.

Then, in the process of embedding the watermark image 12 into the image embedding region 11, it is first determined whether the red hue value at the corresponding position of the pattern portion of the watermark image 12 is less than or equal to a preset value. If the image is embedded in the area 11, the red tonal value of a pixel corresponding to the pattern portion is 90 (less than or equal to the preset value 98), the present embodiment does not modify the red tone value of the pixel. On the other hand, if the red tone value of the other pixel corresponding to the pattern portion is 110 (greater than the preset value 98), the present embodiment will modify the red tone value of this pixel to the preset value 98.

In addition, if the image in the image embedding region 11 and the red color of the pixel corresponding to the blank portion is 90 (less than the hue average value of 100), the present embodiment will modify the red hue value of the pixel to red. The average hue of the 100. On the other hand, if the red color value of the other pixel corresponding to the blank portion is 110 (greater than or equal to the red hue average value 100), then This embodiment does not modify the red tonal value of this pixel.

It can be seen that when the user is authorized to have a threshold value (2) and a mean value (100) of the selected hue, the user can adjust the histogram through the setting of the image browsing device (such as a mobile device). Only the hue between the preset value 98 and the hue average value of 100 is displayed, and the visual information is clearly displayed to announce the image information and avoid being synthesized or tampered with.

As described above, the present invention further provides a corresponding embodiment when the average value of the hue of a hue in the image embedding region 11 is already less than the threshold value. Please refer to FIG. 1 and FIG. 3 together. FIG. 3 is a flowchart of a visual information hiding method according to another embodiment of the present invention. Similar to FIG. 2, in step S301, the present embodiment also determines at least one image embedding region 11 in the original image 10. The manner of judging the image embedding area 11 is as described in the previous embodiment, and the embodiment is not described herein. In step S302, the present embodiment also calculates the average value of the hue of the plurality of tones in the image embedding region 11, respectively. The plurality of hue may be red (R), green (G), and blue (B), and a plurality of corresponding hue average values are average values of red intensity, green intensity, and blue intensity in each pixel.

Different from the previous embodiment, in step S303, the embodiment first determines whether the average value of the tones of the plurality of tones is greater than or equal to a threshold value, thereby selecting one of the plurality of tones, here first assumes The selected hue is red (R). If the average value of the hue of the plurality of tones is not greater than or equal to the threshold value, the image embedding region 11 is determined in step S304 to determine the pattern portion. Whether the red tonal value of the corresponding position is greater than or equal to the preset value. In step S305, if the hue value of the red color corresponding to the position of the pattern portion is less than the preset value, the hue value of the red color corresponding to the position of the pattern portion is set to a preset value. On the other hand, in step S306, if the hue value of red on the corresponding position of the pattern portion is greater than or equal to the preset value, the hue value of red on the corresponding position of the pattern portion is not changed.

Next, in step S307, in the image embedding region 11, it is determined whether the hue value of red on the corresponding position of the blank portion is less than or equal to the hue average value of red. In step S308, if the hue value of the red color corresponding to the position of the blank portion is greater than the hue average value of the red color, the hue value of the red color corresponding to the position of the blank portion is set to the hue average value of the red color. On the other hand, in step S309, if the hue value of red at the corresponding position of the blank portion is less than or equal to the hue average value of red, the hue value of red at the corresponding position of the blank portion is not changed.

In a practical example, when the image embedding region 11 is determined, the average values of the hue of red, green, and blue in the image embedding region 11 are first calculated, and it is assumed that 200, 100, and 0 are respectively calculated, and the threshold value is calculated. The assumption is 2. At this time, since the average value of the hue of each of the hue is larger than 2 (for example, the average value of the hue of the blue here is 0), the present embodiment selects the red having the largest hue average as the selected hue.

Next, since the average value of the hue of the red in the image embedding region 11 is 200, the preset value can be set to 202. Here, the preset value (202) may be a hue average value (200) plus a threshold value (2), and the embodiment does not limit the threshold. The size of the value is freely designed by those of ordinary skill in the art.

Then, in the process of embedding the watermark image 12 into the image embedding region 11, it is first determined whether the red hue value at the corresponding position of the pattern portion of the watermark image 12 is greater than or equal to the preset value 202. If the image is embedded in the area 11, the red color value of a pixel corresponding to the pattern portion is 210 (greater than or equal to the preset value 202), the present embodiment does not modify the red tone value of the pixel. On the other hand, if the red tone value of the other pixel corresponding to the pattern portion is 190 (less than the preset value 202), the present embodiment will modify the red tone value of this pixel to the preset value 202.

In addition, if the image in the image embedding region 11 and the red color value of a certain pixel corresponding to the blank portion is 210 (greater than the hue average value 200 of the red color), the embodiment will change the red tonal value of the pixel to red. The average hue of the 200. On the other hand, if the hue value of the red color of the other pixel corresponding to the blank portion is 190 (less than or equal to the hue average value 200 of red), the present embodiment does not modify the hue value of the red color of this pixel.

It can be seen that when the user is authorized to have the threshold value (2) and the average value of the hue of the selected hue (200), the user can adjust the histogram through the setting of the image browsing device (such as a mobile device). Only the hue between the hue average 200 and the preset value 202 is displayed, and the visual information is clearly displayed to announce the image information and avoid being synthesized or tampered with.

Please refer to FIG. 4a, FIG. 4b, FIG. 4c, FIG. 4d and FIG. 4e, which are exemplary diagrams according to an embodiment of the present invention. In Figure 4a, The original image 41 is a photo from a digital camera. In this embodiment, the original image 41 represents an aircraft flying in the sky, and the background is mostly blue.

In FIG. 4b, the original image 42 includes a first image embedding region 420, a second image embedding region 422, and a third image embedding region 424. The first image embedding region 420, the second image embedding region 422, and the third image embedding region 424 are the first three largest tonal stable regions. The background has been proposed in Figure 4a as the sky and mostly blue. In this embodiment, taking the first image area as an example, the average hue of the red color is 50, the average hue of the green color is 120, and the average hue of the blue color is 170. In this embodiment, the threshold is set to two.

It can be seen that the minimum value of the red hue average, the green hue average, and the blue hue average is less than the threshold, and the first image embedding region 420, the second image embedding region 422, and the third image embedding The average of the hue values of red in the pixels of region 424 is less than green and blue, where the selected hue is red.

Then, the watermark image is embedded in the first image embedding region 420, the second image embedding region 422, and the third image embedding region 424. In FIG. 4c, the watermark image embedded image 43 includes a watermark image 431, a watermark image 432, and a watermark image 433. The manner of embedding the watermark image is as described above and will not be described here.

The user can transmit and receive the image 43 and the threshold value (2) after the watermark image is embedded via the mobile device. Of course, the average value of the hue can be calculated by the user's electronic device or provided by an authorized unit. to In this embodiment, the user can set a histogram of his electronic device such that the electronic device only displays content having a tone value between 48 and 50. As shown in the figure, since the blank portion has been adjusted to the hue average value 50 (or above) and the pattern portion is set to the preset value 48 (or below), the watermark image 431 can be clearly seen. . According to the above processing, the watermark image system in which the watermark image 432 and the watermark image 433 are displayed and displayed can be "YZU".

In Fig. 4d, it is the image 44 after the watermark image is embedded. The process is described above and will not be described. In this embodiment, the watermark image embedded image 44 has only one image embedding region 441. As can be seen from the figure, the watermark image in the image embedding area 441 is a 2-dimensional bar code, or a Quick Response Code (QR-Code).

In Fig. 4e, the image 45 after the watermark image is embedded after the visual information display application method is performed. The process is described above and will not be described. In this embodiment, the image 45 embedded in the watermark image has only one image embedding area 451. As can be seen from the figure, the watermark image in the image embedding area 451 is "YZU".

In Figure 5a, the original image 50 is used. The content of the original image 50 is a screenshot of a water drop film taken by a camera. The image embedding area 501 is a maximum tonal stable area of the original image 50, and a watermark image is embedded in the image embedding area 501. In this embodiment, the average hue of the red color is 88, the average hue of the green color is 40, and the average hue of the blue color is 57. In this embodiment, the threshold is set to 5. In this embodiment, the red hue The average value, the average value of the green hue, and the average value of the hue of the blue are smaller than the threshold value, and since the sum of the intensities of the green hue values in the image embedding region 501 is much larger than the red and blue colors, the hue selected here is green.

As shown in the previous example, in FIG. 5b, the image 51 after the watermark image is embedded includes the watermark image 511. In this embodiment, the user can set his electronic device histogram so that the electronic device only displays content having a tonal value between 35 and 40. As shown in the figure, since the blank portion has been adjusted to the hue average value 40 (or above) and the pattern portion is set to the preset value 35 (or below), the watermark image 511 can be clearly seen. It is "YZU".

In Figure 6a, it is the original image 60. The content of the original image 60 is a photo of a flower taken by a monocular camera. The image embedding area 601 is the maximum tonal stable area of the original image 60, and the watermark image is embedded in the image embedding area 601. In this embodiment, the average hue of the red color is 100, the average hue of the green color is 90, and the average hue of the blue color is 68. The threshold is set to 20. The minimum value of the red hue average, the green hue average, and the blue hue average is greater than the threshold, and since the minimum value of the hue average in the image embedding region 601 is blue, the hue selected here is It is blue.

In FIG. 6b, the image 61 after the watermark image is embedded includes the watermark image 611. In this embodiment, the user can set his electronic device histogram so that the electronic device only displays content having a tone value between 48 and 68. As shown in the figure, since the blank portion has been adjusted to the hue average 68 (or above) and the pattern portion is set to the preset value 48 (or below), it is clear See watermark image 611 is "YZU".

In Figure 7a, it is the original image 70. The content of the original image 70 is a fruit photograph taken by a monocular camera, and the image embedding area 701 is the maximum tonal stable area of the original image 70, and the watermark image is embedded in the image embedding area 701. In this embodiment, the average hue of red is 25, the average value of hue of green is 0, and the average value of hue of blue is 3. The threshold is set to 10. The minimum value of the red hue average, the green hue average, and the blue hue average is not greater than or equal to the threshold value, and since the maximum value of the hue average in the image embedding region 701 is red, it is selected here. The hue is red.

In FIG. 7b, the watermark image embedded image 71 includes a watermark image 711. In this embodiment, the user can adjust his electronic device histogram so that the electronic device only displays content having a tone value between 15 and 25. As shown in the figure, since the blank portion has been adjusted to the hue average value 15 (or below) and the pattern portion is set to the preset value 25 (or above), the watermark image 711 can be clearly seen. It is "YZU".

In summary, the visual information hiding method disclosed in the present invention embeds visual information in an area of an image that is invisible to the human eye. When you want to display the imperceptible information in the image of the device, you only need to adjust the lower limit value or the upper limit value range of the hue histogram according to the threshold value and the average value of the hue, so that the hidden visual information can be displayed. The visual information hiding method can embed visual information in a color area of the original image that is less noticeable to the naked eye to maintain the image. Readability and hide important visual information. When the visual information is displayed, the visual information can be clearly displayed through the adjustment of the histogram to declare the image information and avoid being synthesized or tampered with. In addition, only the licensor has the threshold value and the average value of the hue to display the hidden visual information, which can improve the confidentiality of hidden information.

While the invention has been described above in the foregoing embodiments, it is not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

S201~S209‧‧‧Step procedure

Claims (17)

A visual information hiding method for hiding a visible watermark image in an original image, the watermark image having a pattern portion and a blank portion, the visual information hiding method comprising: determining at least the original image An image embedding region; respectively calculating an average value of the tones of the plurality of tones in the image embedding region; selecting one of the tones according to the hue average of the tones; and determining, in the image embedding region, the portion corresponding to the pattern Whether the tonal value of the selected color tone is less than or equal to a preset value; and determining, in the image embedding region, whether the hue value of the selected hue at the corresponding position of the blank portion is greater than or equal to a hue average of the hue Wherein if the tonal value of the selected color tone corresponding to the position of the pattern portion is greater than the preset value, the tonal value of the selected color tone corresponding to the position of the pattern portion is set to the preset value; and wherein If the hue value of the selected hue at the corresponding position of the blank portion is smaller than the hue average value of the selected hue, the The tone value tone portion corresponding to the position of the selected tone set to an average value of the selected hue. The visual information hiding method of claim 1, wherein the preset value and the average value of the hue of the hue are at least one threshold value. The visual information hiding method of claim 2, wherein the threshold value is greater than or equal to 2. The visual information hiding method of claim 2, wherein in the step of determining whether the tonal value of the selected color tone at the corresponding position of the pattern portion is less than or equal to the preset value, if the corresponding portion of the pattern portion is selected If the hue value of the hue is less than or equal to the preset value, the hue value of the hue selected at the corresponding position of the pattern portion is not changed. The visual information hiding method according to claim 2, wherein in the step of determining whether the tonal value of the selected color tone at the corresponding position of the blank portion is greater than or equal to the average value of the selected hue of the hue, if the blank is left The hue value of the selected hue at the partial corresponding position is greater than or equal to the hue average value of the selected hue, and the hue value of the selected hue at the corresponding position of the blank portion is not changed. The visual information hiding method according to claim 2, wherein in the step of selecting one of the tones according to the average value of the hue of the tones, it is further determined whether the average value of the hue of the tones is greater than or equal to the threshold value. . The visual information hiding method according to claim 6, wherein when the average value of the hue of the hue is greater than or equal to the threshold value, the hue having the smallest hue average value among the hue is selected. The visual information hiding method according to claim 2, wherein the image embedding region is a maximum tonal stable region of the original image, wherein the maximum hue stable region is a red hue value of each pixel, a green hue value, and After one of the blue tonal values is subjected to the pairwise alignment between the pixels, the largest region with the smallest average gap value is obtained. The visual information hiding method according to claim 2, wherein the average value of the hue of the hue refers to a hue average of red, a hue average of green, and an average hue of blue. A visual information hiding method for embedding a watermark image into an original image, the watermark image having a pattern portion and a blank portion, the visual information hiding method comprising: determining at least one image in the original image An embedding region; respectively calculating a hue average of the plurality of tones in the image embedding region; determining whether the hue average of the hue is greater than or equal to the threshold value, thereby selecting one of the tones; if the hue If the average value of the hue is not greater than or equal to the threshold value, determining whether the hue value of the selected hue in the corresponding position of the pattern portion is greater than or equal to a preset value in the image embedding region; in the image embedding region, determining Whether the tonal value of the selected color tone corresponding to the position of the blank portion is less than or equal to the average value of the hue of the selected color tone; Wherein if the tonal value of the selected color tone corresponding to the position of the pattern portion is smaller than the preset value, the tonal value of the selected color tone corresponding to the position of the pattern portion is set to the preset value; and wherein if the The hue value of the hue selected at the corresponding position of the white portion is greater than the hue average value of the selected hue, and the hue value of the hue selected at the corresponding position of the blank portion is set to the hue of the selected hue. average value. The visual information hiding method of claim 10, wherein the preset value and the mean value of the hue of the hue are at least one threshold value. The visual information hiding method of claim 11, wherein the threshold value is greater than or equal to 2. The visual information hiding method of claim 11, wherein in the step of determining whether the tonal value of the selected color tone at the corresponding position of the pattern portion is greater than or equal to the preset value, if the corresponding portion of the pattern portion is selected If the hue value of the hue is greater than or equal to the preset value, the hue value of the hue selected at the corresponding position of the pattern portion is not changed. The visual information hiding method of claim 11, wherein in the step of determining whether the tonal value of the hue selected at the corresponding position of the blank portion is less than or equal to the hue average of the hue, if the blank portion corresponds to the position When the tone value of the selected color tone is less than or equal to the tone average value of the selected color tone, the tone value of the color tone selected at the corresponding position of the blank portion is not changed. The visual information hiding method of claim 11, wherein in determining whether the average value of the hue of the hue is greater than or equal to the threshold value, in the step of selecting one of the hue, if the hue of the hue is average If the values are not greater than or equal to the threshold value, the hue having the largest hue average value among the hue is selected. The visual information hiding method of claim 11, wherein the image embedding region is one of the original image maximum tonal stability regions, wherein the maximum tonal stability region is a red tonal value of each pixel, a green tonal value, and After one of the blue tonal values is subjected to the pairwise alignment between the pixels, the largest region with the smallest average gap value is obtained. The visual information hiding method according to claim 11, wherein the hue average of the hue refers to a hue average of red, a hue average of green, and a hue average of blue.