CN113379583A - Image signature method and device, computing equipment and storage medium - Google Patents
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Abstract
The disclosure relates to an image signature method, an image signature device, a computing device and a storage medium, wherein the image signature method comprises the following steps: acquiring user characteristic information and a first image; processing the user characteristic information to obtain a plurality of color values corresponding to the user characteristic information; and modifying the color value of the first pixel point in the preset area of the first image according to the plurality of color values to obtain a second image. By utilizing the signature method provided by the disclosure, the user characteristic information is hidden in the first image, and the reliability of the right protection of the first image is improved. In addition, when the second image with the signature is displayed, information except the second image is not displayed, so that the appearance of the whole image is prevented from being influenced.
Description
Technical Field
The present disclosure relates to the field of computer technologies, and in particular, to an image signature method and apparatus, a computing device, and a storage medium.
Background
With the increasing awareness of intellectual property rights, in order to protect rights such as copyright, etc., a watermark may be added to the file, and the content of the watermark may be the name, website, etc. of the author. The watermark can be covered at an important position of the image, generally a place which is as close to the edge of the picture as possible and has rich information, so as to prevent the attribution and related legal problems caused by unauthorized embezzlement of the image.
However, the watermark is displayed at the same time as the document is displayed, which affects the appearance of the whole document screen. Moreover, the watermark can be weakened or removed by certain technical means, so that the reliability of the file right protection realized by the watermark is not high.
Disclosure of Invention
The present disclosure provides an image signature method, an image signature apparatus, a computing device, and a storage medium, which at least solve the problems in the related art that the addition of a watermark affects the overall appearance of a file, and that the reliability of rights protection by the watermark is not high. The technical scheme of the disclosure is as follows:
according to a first aspect of the embodiments of the present disclosure, there is provided an image signature method, including:
acquiring user characteristic information and a first image;
processing the user characteristic information to obtain a plurality of color values corresponding to the user characteristic information;
and modifying the color value of a first pixel point in the preset area of the first image according to the plurality of color values to obtain a second image.
In one or more embodiments of the present application, modifying, according to the plurality of color values, a color value of a first pixel point in a predetermined region of the first image to obtain a second image, includes:
determining M color values according to the plurality of color values, where the M color values are color values obtained by processing the plurality of color values, or the M color values are color values of part or all of the plurality of color values; m is a positive integer;
and replacing the color values of the M first pixel points with the M color values to obtain the second image.
In one or more embodiments of the present application, the processing the user characteristic information to obtain a plurality of color values corresponding to the user characteristic information includes:
converting the user characteristic information into a character string;
grouping the character strings to obtain a plurality of groups of characters;
determining a plurality of color values corresponding to the user characteristic information according to the plurality of groups of characters; wherein each color value of the plurality of color values is formed by a corresponding set of characters.
In one or more embodiments of the present application, the converting the user characteristic information into a character string includes:
under the condition that the user characteristic information comprises text information, encrypting the text information to obtain the character string;
and/or the presence of a gas in the gas,
under the condition that the user characteristic information comprises multimedia information, arranging color values in an image corresponding to the multimedia information in sequence to obtain the character string; under the condition that the multimedia information is video information, an image corresponding to the multimedia information is at least one image frame in the video information; and under the condition that the multimedia information is audio information, the image corresponding to the multimedia information is a spectrogram of the audio information.
In one or more embodiments of the present application, after the color values in the image corresponding to the multimedia information are sequentially arranged to obtain the character string, the method further includes:
compressing the character string to obtain a compressed character string;
correspondingly, grouping the character strings to obtain a plurality of groups of characters, including:
and grouping the compressed character strings to obtain the plurality of groups of characters.
In one or more embodiments of the present application, the modifying, according to the plurality of color values, a color value of a first pixel point in a predetermined region of the first image to obtain a second image includes:
determining a target circle in the first image by taking the center point of the first image as the center of a circle, and determining pixel points uniformly distributed on the target circle as first pixel points in a preset area of the first image;
and modifying the color value of a first pixel point in a preset area of the first image according to the plurality of color values.
In one or more embodiments of the present application, the modifying, according to the plurality of color values, a color value of a first pixel point in a predetermined region of the first image to obtain a second image includes:
obtaining symmetrical pixel points on the first image, wherein the symmetrical pixel points are distributed in an axisymmetric manner about a symmetry axis of the first image;
determining the symmetrical pixel points as first pixel points in a preset area of the first image;
and modifying the color value of a first pixel point in the preset area of the first image according to the plurality of color values to obtain a second image.
In one or more embodiments of the present application, the modifying, according to the plurality of color values, a color value of a first pixel point in a predetermined region of the first image to obtain a second image includes:
determining a plurality of straight lines, wherein the plurality of straight lines comprises at least one of: a line parallel to the edge of the first image, a line on which a diagonal of the first image is located;
determining pixel points distributed on the straight lines as first pixel points in a preset area of the first image;
and modifying the color value of a first pixel point in the preset area of the first image according to the plurality of color values to obtain a second image.
In one or more embodiments of the present application, pixel points on the same straight line satisfy one of the following:
the pixels on the straight line are uniformly distributed on the straight line;
the pixels on the straight line are randomly distributed on the straight line;
under the condition that the straight line passes through the center point of the first image, pixel points on the straight line and the center point are uniformly distributed on the straight line;
the pixel points on the straight line are uniformly distributed on one part of the section of the straight line and are randomly distributed on the other part of the section.
In one or more embodiments of the present application, after the color value of the target pixel point in the predetermined region of the first image is modified according to the plurality of color values to obtain a second image, the method further includes:
extracting a color value of a second pixel point on the second image, wherein the position of the second pixel point on the second image is consistent with the position of the first pixel point on the first image;
and under the condition that the color value of the second pixel point on the second image is consistent with the color value corresponding to the user characteristic information, outputting the information that the signature verification is passed.
According to a second aspect of the embodiments of the present disclosure, there is provided an image signature apparatus including:
a first acquisition module configured to acquire user characteristic information and a first image;
the processing module is configured to process the user characteristic information to obtain a plurality of color values corresponding to the user characteristic information;
and the modifying module is configured to modify the color value of the first pixel point in the predetermined area of the first image according to the plurality of color values to obtain a second image.
In one or more embodiments of the present application, the modification module comprises:
a first determining unit configured to determine M color values according to the plurality of color values, where the M color values are color values obtained by processing the plurality of color values, or the M color values are color values of part or all of the plurality of color values; m is a positive integer;
and the replacing unit is configured to replace the color values of the M first pixel points with the M color values to obtain the second image.
In one or more embodiments of the present application, the processing module comprises:
a conversion unit configured to convert the user characteristic information into a character string;
the grouping unit is configured to group the character strings to obtain a plurality of groups of characters;
a second determination unit configured to determine a plurality of color values corresponding to the user feature information according to the plurality of groups of characters; wherein each color value of the plurality of color values is formed by a corresponding set of characters.
In one or more embodiments of the present application, the conversion unit is configured to:
under the condition that the user characteristic information comprises text information, encrypting the text information to obtain the character string;
and/or the presence of a gas in the gas,
under the condition that the user characteristic information comprises multimedia information, arranging color values in an image corresponding to the multimedia information in sequence to obtain the character string; under the condition that the multimedia information is video information, an image corresponding to the multimedia information is at least one image frame in the video information; and under the condition that the multimedia information is audio information, the image corresponding to the multimedia information is a spectrogram of the audio information.
In one or more embodiments of the present application, the apparatus further comprises:
the compression module is configured to compress the character string to obtain a compressed character string;
the grouping unit is specifically configured to: and grouping the compressed character strings to obtain the plurality of groups of characters.
In one or more embodiments of the present application, the modification module comprises:
a third determining unit, configured to determine a target circle in the first image with a center point of the first image as a center, and determine pixel points uniformly distributed on the target circle as first pixel points in a predetermined region of the first image;
a first modifying unit configured to modify a color value of a first pixel point within a predetermined region of the first image according to the plurality of color values.
In one or more embodiments of the present application, the modification module comprises:
the acquisition unit is configured to acquire symmetrical pixel points on the first image, wherein the symmetrical pixel points are distributed in an axisymmetric manner about a symmetry axis of the first image;
a fourth determination unit configured to determine the symmetric pixel points as first pixel points within a predetermined region of the first image;
and the second modifying unit is configured to modify the color value of the first pixel point in the predetermined area of the first image according to the plurality of color values to obtain a second image.
In one or more embodiments of the present application, the modification module comprises:
a fifth determining unit configured to determine a plurality of straight lines, wherein the plurality of straight lines include at least one of: a line parallel to the edge of the first image, a line on which a diagonal of the first image is located;
a sixth determining unit configured to determine pixel points distributed on the plurality of straight lines as first pixel points within a predetermined region of the first image;
and the third modifying unit is configured to modify the color value of the first pixel point in the predetermined area of the first image according to the plurality of color values to obtain a second image.
In one or more embodiments of the present application, pixel points on the same straight line satisfy one of the following:
the pixels on the straight line are uniformly distributed on the straight line;
the pixels on the straight line are randomly distributed on the straight line;
under the condition that the straight line passes through the center point of the first image, pixel points on the straight line and the center point are uniformly distributed on the straight line;
the pixel points on the straight line are uniformly distributed on one part of the section of the straight line and are randomly distributed on the other part of the section.
In one or more embodiments of the present application, the apparatus further comprises:
the extraction module is configured to extract a color value of a second pixel point on the second image, wherein the position of the second pixel point on the second image is consistent with the position of the first pixel point on the first image;
and the output module is configured to output the information that the signature verification passes under the condition that the color value of the second pixel point on the second image is consistent with the color value corresponding to the user characteristic information.
According to a third aspect of embodiments of the present disclosure, there is provided a computing device comprising:
a processor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to execute the instructions to implement the steps of any one embodiment of the image signature method provided by the first aspect.
According to a fourth aspect of embodiments of the present disclosure, there is provided a computer-readable storage medium, in which instructions, when executed by a processor of a computing device, enable the computing device to perform the steps of any one of the embodiments of the image signature method provided by the first aspect.
According to a fifth aspect of embodiments of the present disclosure, there is provided a computer program product comprising computer program/instructions which, when executed by a processor, implement the steps of any one of the embodiments of the image signature method provided by the first aspect.
The technical scheme provided by the embodiment of the disclosure at least brings the following beneficial effects:
first, the user characteristic information is processed to obtain a plurality of color values corresponding to the user characteristic information. And then, according to the plurality of color values, modifying the color value of the first pixel point on the first image to obtain a second image with a signature. Therefore, the first image is signed by utilizing the user characteristic information, so that the user characteristic information is hidden in the first image, the problem that the image is used without permission in a network is solved, and the reliability of the right protection of the image is improved. In addition, when the second image with the signature is displayed, information except the second image is not displayed, so that the display effect of the second image is ensured, and the influence on the appearance of the whole image of the image is avoided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure and are not to be construed as limiting the disclosure.
Fig. 1 is a schematic flowchart of an embodiment of an image signature method provided in the present disclosure.
Fig. 2a is a schematic diagram of an embodiment of a distribution of first pixel points on a first image according to the present disclosure.
Fig. 2b is a schematic diagram of another embodiment of a distribution of first pixel points on a first image according to the present disclosure.
Fig. 3a is a schematic diagram of a distribution situation of a first pixel point on a first image according to another embodiment of the present disclosure.
Fig. 3b is a schematic diagram of a distribution situation of first pixel points on a first image according to still another embodiment of the present disclosure.
Fig. 4a is a schematic diagram of a distribution situation of first pixel points on a first image according to still another embodiment of the present disclosure.
Fig. 4b is a schematic diagram of a distribution situation of the first pixel points on the first image according to still another embodiment of the present disclosure.
Fig. 4c is a schematic diagram of a distribution situation of the first pixel points on the first image according to still another embodiment of the present disclosure.
Fig. 5 is a schematic flowchart of another embodiment of an image signature method provided by the present disclosure.
Fig. 6 is a schematic diagram of a distribution of first pixel points on a first image according to still another embodiment of the present disclosure.
Fig. 7 is a schematic structural diagram of an embodiment of an image signature apparatus provided in the present disclosure.
FIG. 8 is a schematic block diagram illustrating one embodiment of a computing device provided by the present disclosure.
Detailed Description
In order to make the technical solutions of the present disclosure better understood by those of ordinary skill in the art, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are capable of operation in sequences other than those illustrated or otherwise described herein. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
In order to solve the problems that the appearance of the whole picture of a file is influenced due to the fact that a watermark is added in the related technology, and the reliability of realizing right protection through the watermark is not high, the disclosure provides an image signature method. And then, according to the plurality of color values, modifying the color value of the first pixel point in the preset area of the first image to obtain a second image.
Therefore, the first image is signed by utilizing the user characteristic information, so that the user characteristic information is hidden in the first image, the problem that the image is used without permission in a network is solved, and the reliability of the right protection of the image is improved. In addition, when the second image with the signature is displayed, information except the second image is not displayed, so that the display effect of the second image is ensured, and the influence on the appearance of the whole image of the image is avoided.
The image signature method provided by the disclosure can be used for adding the user characteristic information into the photo so as to protect the copyright of the photo. The image signature method can also add the user characteristic information to the pictorial work so as to protect the copyright of the pictorial work.
The image signature method can be applied to a computing device, and the computing device can be a mobile computing device or a non-mobile computing device. By way of example, the mobile computing device may be a mobile phone, a tablet computer, a notebook computer, a palm top computer, an in-vehicle computing device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a Personal Digital Assistant (PDA), and the like, and the non-mobile computing device may be a server, a Network Attached Storage (NAS), a personal computer (personal computer, PC), a Television (TV), a teller machine, a self-service machine, and the like, and the disclosed embodiments are not limited in particular.
The image signature method provided by the present disclosure is explained below with reference to the drawings. Fig. 1 is a schematic diagram of an embodiment of an image signature method provided by the present disclosure. As shown in fig. 1, the image signature method 100 includes:
s102, user characteristic information and a first image are obtained.
As an example, in S102, the user characteristic information and the first image may be obtained locally, or the user characteristic information and the first image sent by other computing devices may be received.
The user characteristic information may be characteristic information of a user who owns the copyright of the first image, and the characteristic information may be information capable of characterizing the identity of the user. In particular, the user characteristic information may comprise at least one of: text information, video information, and audio information. The text information may include at least one of: identity card number, mobile phone number, license plate number, driving license number and website. The video information may be video information introduced by the user, and the audio information may be audio information introduced by the user.
As an example, the first image may be an image in an arbitrary first file. The first file may be a document (such as a WORD document or a PDF document), and the first image is a picture in the document. Alternatively, the first file may be a video and the first image may be an image frame in the video.
The image signature method 100 further includes:
and S104, processing the user characteristic information to obtain a plurality of color values corresponding to the user characteristic information.
In S104, the user characteristic information may be converted into a character string; grouping the character strings to obtain a plurality of groups of characters; determining a plurality of color values corresponding to the user characteristic information according to the plurality of groups of characters; wherein each color value of the plurality of color values is formed by a corresponding set of characters.
Wherein the character string may be a decimal character string, a binary character string or a hexadecimal character string. As an example, in the case of obtaining a decimal character string or a binary character string, the decimal character string or the binary character string may be first converted into a hexadecimal character string, and then a plurality of hexadecimal color values may be determined according to the hexadecimal character string.
The color value may be a Red-Green-Blue (Red, Green, Blue, RGB) color value or a Red-Green-Blue transparency (Red, Green, Blue, Alpha, RGBA) color value. If the M color values are RGB color values, each color value may be a 6-bit hexadecimal character in which the first two bits represent the R color value, the middle two bits represent the G color value, and the last two bits represent the B color value. If the plurality of color values are RGBA color values, each color value may be an 8-bit hexadecimal character, where for the first 6-bit character of the 8-bit character, every second character represents one color value in R, G, B and the last two characters in the 8-bit value represent transparency (Alpha, A).
S104 is exemplified below.
For example, the user characteristic information is converted into a character string, and the character string includes 32 hexadecimal characters. The 32 characters are divided equally into four groups, each group comprising 8 characters. And determining corresponding RGBA color values according to the 8 characters of each group. Where a group of 8 characters is 80FFFF00, the corresponding RGBA color value is (80, FF, FF, 00). By analogy, four RGBA color values can be obtained from a character string including 32 characters.
It should be noted that, the above describes an embodiment of S104 in hexadecimal, and the value in each color value is not limited to a binary value, a decimal value, or a hexadecimal value.
The image signature method 100 further includes:
and S106, modifying the color value of the first pixel point in the preset area of the first image according to the plurality of color values to obtain a second image.
As an example, S106 may include: replacing color values of a plurality of first pixel points in a preset area of the first image with a plurality of color values, wherein the plurality of first pixel points correspond to the plurality of color values one to one.
As another example, S106 may include: determining M color values according to the plurality of color values, wherein the M color values are color values obtained by processing the plurality of color values, or the M color values are partial or all color values in the plurality of color values; m is a positive integer; and replacing the color values of the M first pixel points with M color values to obtain a second image, wherein the M first pixel points correspond to the plurality of color values one to one.
The following illustrates how M color values are obtained.
For example, M function models are preset, a plurality of color values are processed by using the 1 st function model to obtain the 1 st color value, a plurality of color values are processed by using the 2 nd function model to obtain the 2 nd color value, and by analogy, M function models are used to obtain M color values.
For another example, a dominant color value of a predetermined area of the first image may be obtained, where the dominant color value is a color value with the largest number of color values of pixels in the predetermined area; calculating the matching degree of the plurality of color values and the main color value; sorting the color values according to the sequence of the matching degrees from large to small; and acquiring the first M color values in the sorted color values.
The number of the predetermined areas may be one or more, and the predetermined areas may include at least one of the following areas: a center region, an upper left corner region, an upper right corner region, a lower left corner region, and a lower right corner region. In addition to this, the predetermined area may include an area having key information.
It should be noted that M is an integer smaller than a predetermined value, so that color values of a small number of pixel points on the first image are replaced, so that there is substantially no difference visually between the first image obtained after replacement and the first image obtained before replacement.
In the embodiment of the disclosure, the first image in the first file is signed by using the user characteristic information, so that the user characteristic information is hidden in the first image, the problem that the image is used without permission in a network is solved, and the reliability of the right protection of the image is improved.
In addition, when the second image with the signature is displayed, information except the second image is not displayed, and the intrusiveness to the image is small during the signature, so that the display effect of the image is ensured, and the influence on the appearance of the whole image of the image is avoided.
The image signature method 100 provided by the present disclosure can be applied in a scenario of protecting ownership of an image. For example, a user takes a photo, signs the photo by using the image signature method provided by the present disclosure, and after the photo is signed, the photo can be distributed to the network, so that the ownership of the photo is protected, and other users are prevented from illegally using the photo.
The image signature method 100 provided by the present disclosure may also be applied in scenarios that protect ownership of video. For example, a user creates a video, and signs a predetermined image frame in the video by using the image signature method provided by the present disclosure, where the predetermined image frame may be an image frame including key information in the video, and the number of the predetermined image frames may be one or more; after the predetermined image frames are signed, the predetermined image frames in the video may be replaced with image frames having signatures, forming a video having signatures. And then, the video is distributed on the network to realize the protection of the ownership of the video and avoid other users from illegally using the video.
The above is only an example of an application scenario of the image signature method provided by the present disclosure, and the image signature method provided by the present disclosure may also be applied to other scenarios, such as a scenario of protecting ownership of a document, and the protection is implemented by signing an image in the document that needs to be protected, and a specific implementation process is similar to the above embodiment, and is not described herein again.
In one or more embodiments of the present disclosure, converting the user characteristic information into a character string may include:
under the condition that the user characteristic information comprises text information, encrypting the text information to obtain a character string;
and/or the presence of a gas in the gas,
arranging color values in an image corresponding to the multimedia information in sequence to obtain a character string under the condition that the user characteristic information comprises the multimedia information, wherein the image corresponding to the multimedia information is at least one image frame in the video information under the condition that the multimedia information is the video information; and under the condition that the multimedia information is the audio information, the image corresponding to the multimedia information is a spectrogram of the audio information.
The number of the text messages can be multiple, the text messages are sequenced firstly, and then the sequenced text messages are encrypted to obtain the character strings. For example, the identity card number, the mobile phone number, the license plate number and the driver license number of the user are sequenced in any order, and after the sequencing is finished, a plurality of text messages after the sequencing can be encrypted by using an irreversible encryption algorithm to obtain a character string. The irreversible encryption algorithm may include at least one of: fifth version of Message Digest Algorithm (Message Digest Algorithm 5, MD5), Hash-based Message Authentication Code (HMAC), Secure Hash Algorithm (SHA). Wherein, the SHA comprises SHA-224, SHA-256 and SHA-384.
Under the condition that the user characteristic information comprises the multimedia information, the color values in the image corresponding to the multimedia information can be read first, and then the color values in the image corresponding to the multimedia information are sequenced in sequence to obtain the character string. Thus, the multimedia information is hidden in the first image.
In the embodiment of the application, not only text information but also multimedia information such as video or audio can be hidden in the first image as copyright and ownership declaration information, so that the information hidden in the first image has diversity. Moreover, the user can conveniently select the information hidden in the first image according to the requirement, and the selection range of the user is large.
It should be noted that various information in text information, video, and audio can be hidden in the first image, and the reliability of the signature can be improved.
Because the color values in the image corresponding to the multimedia information are more, the character string obtained by sequentially arranging the color values in the image is longer. However, when the character string is long, most of the information in the character string cannot be hidden in the first image.
In order to solve the technical problem that the sequentially arranged character strings are relatively long, in one or more embodiments of the present disclosure, the image signature method 100 may further include: compressing the character string to obtain a compressed character string;
correspondingly, grouping the character strings to obtain a plurality of groups of characters, including: and grouping the compressed character strings to obtain a plurality of groups of characters.
As an example, the character string may be compressed by using a predetermined character string compression algorithm (e.g., pako.
In the embodiment of the present disclosure, by compressing the character strings, a longer character string may be compressed into a shorter character string, so as to group the shorter character string, thereby obtaining multiple groups of characters. In this way, most characters in the character string can be hidden in the first image, and the reliability of the signature can be improved.
In one or more embodiments of the present disclosure, S106 may include:
determining a target circle in the first image by taking a center point of the first image as a center of a circle, determining pixel points uniformly distributed on the target circle as first pixel points in a predetermined region of the first image, for example, determining the target circle as shown in fig. 2a, and determining the first pixel points uniformly distributed on the target circle, wherein the target circle is a circle with the center point of the first image as the center of a circle and a radius not greater than a short side of the first image, and in fig. 2a, the short side of the first image is a width of the first image;
and modifying the color value of the first pixel point in the preset area of the first image according to the plurality of color values to obtain a second image.
In the embodiment of the present disclosure, the first pixel points are uniformly distributed on the target circle of the first image, and are not aggregated together, so that even if a part of the first image is cut off, the remaining part still includes the pixel points whose color values are replaced, and the remaining part can be used to protect the right of the first image.
In one or more embodiments of the present disclosure, S106 may include:
obtaining symmetrical pixel points on the first image, wherein the symmetrical pixel points are distributed in an axisymmetric manner about a symmetry axis of the first image;
determining the symmetrical pixel points as first pixel points in a preset area of the first image;
and modifying the color value of the first pixel point in the preset area of the first image according to the plurality of color values to obtain a second image.
For example, as shown in fig. 2b, symmetric pixels that are axisymmetrically distributed with respect to the symmetry axis of the first image are obtained on the first image, and the color values of the symmetric pixels on the first image are modified.
The following describes how to obtain the 4 pixels shown in fig. 2b by taking the first pixel as the pixel shown in fig. 2b as an example.
Assuming that a coordinate system with a dot at the vertex of the lower left corner of the first image is selected and the coordinate of the vertex of the upper right corner of the first image is (W, H), the coordinates of 4 pixel points are first determined, wherein the coordinate of the pixel point A1 is
The coordinates of the pixel point B1 are
The coordinate of the pixel point C1 is
The coordinate of the pixel point D1 is
After the coordinates of the 4 pixels are determined, the 4 pixels, namely the pixel A1, the pixel B1, the pixel C1 and the pixel D1, can be obtained.
After 4 color values (4 color values are a, B, C and D respectively) are obtained by processing the user characteristic information, the color value of the pixel point A1 is replaced by a, the color value of the pixel point B1 is replaced by B, the color value of the pixel point C1 is replaced by C, and the color value of the pixel point D1 is replaced by D.
In the embodiment of the present disclosure, the first pixel points are symmetrically distributed on the first image, so that even if a part of the first image is cut off, the remaining part still includes the pixel points whose color values are replaced, and the remaining part can be utilized to protect the right of the first image.
In one or more embodiments of the present disclosure, S106 may include:
determining a plurality of straight lines, wherein the plurality of straight lines comprise at least one of: a line parallel to the edge of the first image, a line on which a diagonal of the first image is located;
determining pixel points distributed on a plurality of straight lines as first pixel points in a preset area of a first image;
and modifying the color value of the first pixel point in the preset area of the first image according to the plurality of color values to obtain a second image.
As an example, the pixel points on the same straight line satisfy one of the following items:
the pixels on the straight line are uniformly distributed on the straight line;
the pixels on the straight line are randomly distributed on the straight line;
under the condition that the straight line passes through the center point of the first image, pixel points and the center point on the straight line are uniformly distributed on the straight line;
the pixels on the straight line are uniformly distributed on one part of the section of the straight line and randomly distributed on the other part of the section, for example, the pixels are uniformly distributed on the two end sections of the straight line and randomly distributed in the middle section; or the pixel points are randomly distributed in the two end sections of the straight line and uniformly distributed in the middle section.
For example, as shown in fig. 3a or fig. 3b, the plurality of first pixel points are distributed on a straight line parallel to an edge of the first image, the edge of the first image may be a long side of the first image or a short side of the first image, and the pixel points on the same straight line are uniformly distributed on the straight line.
For another example, as shown in fig. 4a to 4c, a plurality of first pixel points are distributed on the diagonal line of the first image. As shown in fig. 4a and fig. 4b, the pixels on the same straight line are uniformly distributed on the straight line. Alternatively, as shown in fig. 4c, if a certain straight line passes through the center point of the first image and the plurality of first pixel points do not include the center point, the pixel points on the certain straight line and the center point of the first image may be uniformly distributed on the straight line.
In any embodiment of the image signature method provided by the present disclosure, after the first image is signed, if an right dispute is involved, in order to determine whether a second image involved in the right dispute and the first image with the signature belong to the same image, signature verification may be performed on the second image.
For signature verification of an image, in one or more embodiments of the present application, as shown in fig. 5, after S106, the image signature method 100 may further include:
s108, extracting the color value of a second pixel point on a second image;
and S110, outputting the information that the signature verification is passed under the condition that the color value of the second pixel point on the second image is consistent with the color value corresponding to the user characteristic information.
And the position of the second pixel point on the second image is consistent with the position of the first pixel point on the first image. For example, when signing a first image, if a first pixel point on the first image includes an upper left corner pixel point, a lower left corner pixel point, an upper right corner pixel point, and a lower right corner pixel point on the first image, when signature verification is performed on a second image, a second pixel point on the second image includes four pixel points at the same position on the second image, which are the upper left corner pixel point, the lower left corner pixel point, the upper right corner pixel point, and the lower right corner pixel point on the second image.
As an example, before outputting the information that the signature verification passes, it is further determined whether the color value of the target pixel point on the second image is consistent with the color value corresponding to the user feature information, and specifically, when the number of the second pixel points is multiple, characters in the color values of the multiple second pixel points are spliced according to a predetermined sequence of the color values of the multiple second pixel points to obtain a character string; when the character string is identical with the character string corresponding to the user characteristic information, the second image is signed by using the user characteristic information, and information that the signature verification is passed is output, namely the right of the second image belongs to the user corresponding to the user characteristic information.
For example, it is assumed that when a first image is signed, user feature information is processed to obtain a character string including 16 characters; an RGBA color value is generated from the first 8 characters in the character string, and then, as shown in fig. 6, the color value of the left pixel point in the first image is replaced with the generated RGBA color value. And by analogy, another RGBA color value is generated according to the last 8 characters in the character string, and the color value of the right pixel point in the first image is replaced by the generated another RGBA color value.
Based on the assumption, when the second image is verified, the RGBA color value of the left pixel point and the RGBA color value of the right pixel point in the second image are obtained, 8 characters in the RGBA color value of the right pixel point are placed behind 8 characters in the RGBA color value of the left pixel point, character splicing is carried out, and a character string is obtained. And under the condition that the character string is consistent with the character string corresponding to the user characteristic information, outputting the information that the signature verification passes, otherwise, outputting the information that the signature verification fails.
When signature verification is carried out, the character string corresponding to the user characteristic information is a character string obtained by converting the user characteristic information through a certain algorithm. The mode of converting the user characteristic information into the character string when the second image is signed and verified is consistent with the mode of converting the user characteristic information into the character string when the first image is signed. For example, when the first image is signed, the user characteristic information is encrypted by using the MD5 algorithm to obtain a character string. Then, when the signature of the second image is verified, the user characteristic information is also encrypted by using the MD5 algorithm to obtain a character string.
In the embodiment of the application, the signature verification can be performed on the second image by using the user characteristic information to verify whether the second image belongs to the user corresponding to the user characteristic information, so that the right of the user to the image is protected.
The present disclosure provides an image signature apparatus corresponding to the image signature method provided by the present disclosure. Fig. 7 is a schematic structural diagram of an embodiment of an image signature apparatus provided in the present disclosure. As shown in fig. 7, the image signature apparatus 200 includes:
a first obtaining module 202 configured to obtain user characteristic information and a first image;
the processing module 204 is configured to process the user characteristic information to obtain a plurality of color values corresponding to the user characteristic information;
the modifying module 206 is configured to modify a color value of a first pixel point in a predetermined region of the first image according to the plurality of color values, so as to obtain a second image.
In the embodiment of the disclosure, the first image in the first file is signed by using the user characteristic information, so that the user characteristic information is hidden in the first image, the problem that the image is used without permission in a network is solved, and the reliability of the right protection of the image is improved. In addition, when the second image with the signature is displayed, information except the second image is not displayed, so that the display effect of the second image is ensured, and the influence on the appearance of the whole image of the image is avoided.
In one or more embodiments of the present application, the modification module 206 can include:
a first determining unit configured to determine M color values according to a plurality of color values, where the M color values are color values obtained by processing the plurality of color values, or the M color values are color values of part or all of the plurality of color values; m is a positive integer;
and the replacing unit is configured to replace the color values of the M first pixel points with the M color values to obtain a second image.
In one or more embodiments of the present application, the processing module 204 may include:
a conversion unit configured to convert the user characteristic information into a character string;
the grouping unit is configured to group the character strings to obtain a plurality of groups of characters;
a second determination unit configured to determine a plurality of color values corresponding to the user characteristic information from the plurality of groups of characters; wherein each color value of the plurality of color values is formed by a corresponding set of characters.
In one or more embodiments of the present application, the conversion unit may be configured to:
under the condition that the user characteristic information comprises text information, encrypting the text information to obtain a character string;
and/or the presence of a gas in the gas,
under the condition that the user characteristic information comprises multimedia information, arranging color values in an image corresponding to the multimedia information in sequence to obtain a character string; under the condition that the multimedia information is video information, an image corresponding to the multimedia information is at least one image frame in the video information; and under the condition that the multimedia information is the audio information, the image corresponding to the multimedia information is a spectrogram of the audio information.
In one or more embodiments of the present application, the image signature apparatus 200 may further include:
the compression module is configured to compress the character string to obtain a compressed character string;
the grouping unit is specifically configured to: and grouping the compressed character strings to obtain a plurality of groups of characters.
In one or more embodiments of the present application, the modification module 206 can include:
the third determining unit is configured to determine a target circle in the first image by taking the center point of the first image as a circle center, and determine pixel points uniformly distributed on the target circle as first pixel points in a predetermined area of the first image;
the first modifying unit is configured to modify the color value of a first pixel point in a predetermined area of the first image according to the plurality of color values.
In one or more embodiments of the present application, the modification module 206 can include:
the acquisition unit is configured to acquire symmetrical pixel points on the first image, wherein the symmetrical pixel points are distributed in an axisymmetric manner about a symmetry axis of the first image;
a fourth determination unit configured to determine the symmetric pixel points as first pixel points within a predetermined region of the first image;
and the second modifying unit is configured to modify the color value of the first pixel point in the predetermined area of the first image according to the plurality of color values to obtain a second image.
In one or more embodiments of the present application, the modification module 206 can include:
a fifth determining unit configured to determine a plurality of straight lines, wherein the plurality of straight lines include at least one of: a line parallel to the edge of the first image, a line on which a diagonal of the first image is located;
a sixth determining unit configured to determine pixel points distributed on the plurality of straight lines as first pixel points within a predetermined region of the first image;
and the third modifying unit is configured to modify the color value of the first pixel point in the predetermined area of the first image according to the plurality of color values to obtain a second image.
In one or more embodiments of the present application, pixel points on the same straight line satisfy one of the following:
the pixels on the straight line are uniformly distributed on the straight line;
the pixels on the straight line are randomly distributed on the straight line;
under the condition that the straight line passes through the center point of the first image, pixel points and the center point on the straight line are uniformly distributed on the straight line;
the pixel points on the straight line are uniformly distributed on one part of the section of the straight line and are randomly distributed on the other part of the section.
In one or more embodiments of the present application, the image signature apparatus 200 may further include:
the extraction module is configured to extract a color value of a second pixel point on the second image, wherein the position of the second pixel point on the second image is consistent with the position of the first pixel point on the first image;
and the output module is configured to output the information that the signature verification passes under the condition that the color value of the second pixel point on the second image is consistent with the color value corresponding to the user characteristic information.
In the embodiment of the application, the signature verification can be performed on the second image by using the user characteristic information to verify whether the second image belongs to the user corresponding to the user characteristic information, so that the right of the user to the image is protected.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
The present disclosure also provides a computing device comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute the instructions to implement the steps in any embodiment of the image signature method.
FIG. 8 is a schematic block diagram illustrating one embodiment of a computing device provided by the present disclosure. As shown in fig. 8, the computing device is capable of implementing a block diagram of an exemplary hardware architecture of a computing device according to an information processing method and an information processing apparatus in the embodiments of the present disclosure. The computing device may refer to an electronic device (such as a mobile phone, a tablet computer, a notebook computer, a desktop computer, etc.) and a server (such as a cloud server or a local server) in the embodiments of the present disclosure.
The computing device may include a processor 301 and a memory 302 having stored thereon computer program instructions, the processor 301 and memory 302 being in communication via a bus 303. The processor 301 is configured to execute instructions to implement steps in any embodiment of the image signature method.
The processor 301 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.
The present disclosure also provides a computer-readable storage medium comprising instructions, such as a memory comprising instructions, executable by a processor of a computing device to perform the above-described method. As one example, the storage medium may be a non-transitory computer readable storage medium, e.g., ROM, Random Access Memory (RAM), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and the like.
In an exemplary embodiment, the present disclosure also provides a computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps in any embodiment of the image signature method.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. An image signature method, comprising:
acquiring user characteristic information and a first image;
processing the user characteristic information to obtain a plurality of color values corresponding to the user characteristic information;
and modifying the color value of a first pixel point in the preset area of the first image according to the plurality of color values to obtain a second image.
2. The method of claim 1, wherein modifying a color value of a first pixel in a predetermined region of the first image according to the plurality of color values to obtain a second image comprises:
determining M color values according to the plurality of color values, where the M color values are color values obtained by processing the plurality of color values, or the M color values are color values of part or all of the plurality of color values; m is a positive integer;
and replacing the color values of the M first pixel points with the M color values to obtain the second image.
3. The method of claim 1, wherein the processing the user characteristic information to obtain a plurality of color values corresponding to the user characteristic information comprises:
converting the user characteristic information into a character string;
grouping the character strings to obtain a plurality of groups of characters;
determining a plurality of color values corresponding to the user characteristic information according to the plurality of groups of characters; wherein each color value of the plurality of color values is formed by a corresponding set of characters.
4. The method of claim 3, wherein converting the user characteristic information into a character string comprises:
under the condition that the user characteristic information comprises text information, encrypting the text information to obtain the character string;
and/or the presence of a gas in the gas,
under the condition that the user characteristic information comprises multimedia information, arranging color values in an image corresponding to the multimedia information in sequence to obtain the character string; under the condition that the multimedia information is video information, an image corresponding to the multimedia information is at least one image frame in the video information; and under the condition that the multimedia information is audio information, the image corresponding to the multimedia information is a spectrogram of the audio information.
5. The method of claim 4, wherein after the arranging color values in the image corresponding to the multimedia information in order to obtain the character string, the method further comprises:
compressing the character string to obtain a compressed character string;
correspondingly, grouping the character strings to obtain a plurality of groups of characters, including:
and grouping the compressed character strings to obtain the plurality of groups of characters.
6. The method according to any one of claims 1 to 5, wherein the modifying the color value of the first pixel point in the predetermined region of the first image according to the plurality of color values to obtain the second image comprises:
determining a target circle in the first image by taking the center point of the first image as the center of a circle, and determining pixel points uniformly distributed on the target circle as first pixel points in a preset area of the first image;
and modifying the color value of a first pixel point in the preset area of the first image according to the plurality of color values to obtain a second image.
7. The method according to any one of claims 1 to 5, wherein the modifying the color value of the first pixel point in the predetermined region of the first image according to the plurality of color values to obtain the second image comprises:
obtaining symmetrical pixel points on the first image, wherein the symmetrical pixel points are distributed in an axisymmetric manner about a symmetry axis of the first image;
determining the symmetrical pixel points as first pixel points in a preset area of the first image;
and modifying the color value of a first pixel point in the preset area of the first image according to the plurality of color values to obtain a second image.
8. An image signature apparatus, comprising:
a first acquisition module configured to acquire user characteristic information and a first image;
the processing module is configured to process the user characteristic information to obtain a plurality of color values corresponding to the user characteristic information;
and the modifying module is configured to modify the color value of the first pixel point in the predetermined area of the first image according to the plurality of color values to obtain a second image.
9. A computing device, comprising:
a processor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to execute the instructions to implement the image signature method of any one of claims 1 to 7.
10. A computer-readable storage medium, wherein instructions in the computer-readable storage medium, when executed by a processor of a computing device, enable the computing device to perform the image signature method of any of claims 1 to 7.
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