CN107944438B - Document image correction method and mobile terminal - Google Patents
Document image correction method and mobile terminal Download PDFInfo
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- CN107944438B CN107944438B CN201711297451.6A CN201711297451A CN107944438B CN 107944438 B CN107944438 B CN 107944438B CN 201711297451 A CN201711297451 A CN 201711297451A CN 107944438 B CN107944438 B CN 107944438B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/98—Detection or correction of errors, e.g. by rescanning the pattern or by human intervention; Evaluation of the quality of the acquired patterns
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/40—Filling a planar surface by adding surface attributes, e.g. colour or texture
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/20—Image preprocessing
- G06V10/24—Aligning, centring, orientation detection or correction of the image
- G06V10/245—Aligning, centring, orientation detection or correction of the image by locating a pattern; Special marks for positioning
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Abstract
The invention provides a document image correction method and a mobile terminal, wherein the method comprises the following steps: acquiring a target document image to be corrected; under the condition that the target document image has a default, determining the theme color of the target document image; and filling the unfilled corner areas of the target document image with colors by adopting the theme colors, and outputting the document correction image. The embodiment of the invention can realize the acquisition of the document correction image with consistent tone and ensure the nature and the uniformity of the display effect of the document correction image.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a document image correction method and a mobile terminal.
Background
Currently, when a mobile terminal user shoots a document, the document correction can be performed on the shot document image, so that the document area in the acquired image is expected to be the largest rectangular area in the image, a corrected transformation matrix is calculated by detecting the largest rectangular area in the image and utilizing the characteristic that the document area image is in a rectangular plane, and a front view only containing the document is obtained by transformation. The image obtained by correction is similar to the image obtained by scanning the document, and the corrected document image can better accord with the habit of reading the document of people and improve the expression of the document image.
In the prior art, when a user shoots a document region, shooting is incomplete frequently, and a certain 'corner' region of a rectangular document is missing, and the user cannot perceive the situation. When the document correction is performed on the image with missing corner regions of the rectangular document part, the obtained corrected image has missing of the content of the region near the missing corners, and the missing region is often filled with pure color, and is generally black.
In the algorithm, when the image of the corner region of the rectangular document is missing, and the corner region is filled with pure color, the difference between the filled color and the theme color of the document is large, so that obvious contrast is brought in a correction picture, the displayed contrast is abrupt, and the use of a user is influenced.
Disclosure of Invention
The embodiment of the invention provides a document image correction method and a mobile terminal, and aims to solve the problems that in the prior art, when a pure color filling is adopted for a corner lacking area of a document image, the color difference is obvious, the display effect is sharp, and the use of a user is influenced.
In order to solve the above problem, the embodiment of the present invention is implemented as follows:
in a first aspect, an embodiment of the present invention provides a document image correction method, including:
acquiring a target document image to be corrected;
under the condition that the target document image has a default, determining the theme color of the target document image;
and filling the unfilled corner areas of the target document image with colors by adopting the theme colors, and outputting the document correction image.
In a second aspect, an embodiment of the present invention provides a mobile terminal, including:
the first acquisition module is used for acquiring a target document image to be corrected;
the first determining module is used for determining the theme color of the target document image under the condition that the target document image has a missing corner;
and the processing module is used for filling the color of the unfilled corner area of the target document image by adopting the theme color and outputting the document correction image.
In a third aspect, an embodiment of the present invention further provides a mobile terminal, including a processor, a memory, and a computer program stored on the memory and operable on the processor, where the computer program, when executed by the processor, implements the steps of the document image correction method described above.
In a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the document image correction method described above.
In the embodiment of the invention, the target document image to be corrected is obtained, the theme color of the target document image is determined when the target document image has the unfilled corner, the unfilled corner area of the target document image is subjected to color filling according to the theme color, the document correction image is output, the document correction image with consistent color tone can be obtained, the natural and uniform display effect of the document correction image is ensured, and the use effect of the document correction image is further ensured.
Drawings
FIG. 1 is a schematic diagram of a document image correction method according to an embodiment of the invention;
FIG. 2a is a schematic diagram of a target document image in an image coordinate system according to an embodiment of the present invention;
FIG. 2b is a diagram of a second example of a target document image in an image coordinate system according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating matrix transformation of a target document image according to an embodiment of the present invention;
FIG. 4 is a diagram of a mobile terminal according to an embodiment of the invention;
fig. 5 is a schematic diagram of a hardware structure of a mobile terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a method for correcting a document image, as shown in fig. 1, including:
Firstly, a target document image to be corrected needs to be acquired, wherein when the target document image is acquired, the mobile terminal acquires a photographing instruction, and a camera is used for photographing a presentation or other text contents to acquire the target document image to be corrected. After the target document image is acquired, the target document image needs to be detected to judge whether the target document image has a defect. The ways of determining whether the target document image has a missing corner include two ways, which are described below.
In a first mode
After a target document image to be corrected is obtained, obtaining a preset size image containing the target document image; establishing an image coordinate area according to the image with the preset size; acquiring vertex coordinates corresponding to a target document image; and determining the unfilled corner state of the target document image according to the position relation between the vertex coordinates and the image coordinate area.
For the obtained target document image, obtaining a preset size image containing the target document image, where the preset size image is a shot image shot by a camera, and the shot content in the shot image includes the target document content and may also include other content (e.g., background content). After the preset size image is obtained, an image coordinate area is established according to the preset size image. As shown in fig. 2a-2b, the lower left corner of the preset size image is used as the origin of coordinates, an X axis is established according to the width direction of the preset size image, and a Y axis is established according to the height direction of the preset size image, so as to form a planar coordinate system. And determining an image coordinate area in a plane coordinate system according to the size information of the image with the preset size. Wherein the width of the preset size image is W, and the height is H, then the coordinates at the four vertices of the formed icon coordinate area are (0, 0), (W, 0), (0, H), and (W, H), respectively. The image coordinate area is an area corresponding to the image with the preset size, and the image coordinate area is formed in a first quadrant of the coordinate system.
After the image coordinate area is determined, four corresponding vertexes need to be determined for the target document image, and since angles exist at the positions of the vertexes, detection can be performed by using a corner detection algorithm. The coordinates of the four vertices of the target document image are then determined in a planar coordinate system. When four vertices of the target document image are determined, for the target document image shown in fig. 2a (the target document image is the content of the region surrounded by the solid line in the image coordinate region), two adjacent edges of the target document image need to be extended, and an intersection point a of the two edges is determined, so as to obtain the four vertices. After the four vertices are determined, the coordinates of the four vertices are determined in a planar coordinate system. For the target document image shown in fig. 2b (the target document image is the content of the region surrounded by the solid line in the image coordinate region), two pairs of adjacent two sides need to be extended, and two intersection points C and D are determined to obtain four vertices. After the four vertices are determined, the coordinates of the four vertices are determined in a planar coordinate system.
After determining the vertex coordinates corresponding to the target document image in the planar coordinate system, it is required to detect whether the acquired vertex coordinates are all located in the image coordinate area. If the vertex coordinates are all located in the image coordinate area, namely when the ranges of x in the vertex coordinates (x, y) are all 0-W and y is 0-H, determining that the vertex coordinates are all located in the image coordinate area and the target document image has no unfilled corner. If a vertex coordinate is located outside the image coordinate area, the target document image can be determined to have a corner defect. If the two vertex coordinates are both located outside the image coordinate area and are not located on the same side of the image coordinate area, it can be determined that the target document image has a corner defect. If only one vertex coordinate can be detected in the image coordinate area, the target document image can be determined to have a corner defect.
It should be noted that the missing corner condition in the embodiment of the present invention includes a condition that one corner (vertex) is missing, two corners (vertices) are missing, and a condition that three corners (vertices) are missing, and for the condition that three corners are missing, only one corner (vertex) exists in the image coordinate region is detected by using a corner point detection algorithm, so that the missing corner of the target document image can be determined. For the situation of lacking two corners, the two corners need to be located on different sides of the image coordinate area, at this time, other two corners (vertexes) can be determined according to the extension of the adjacent sides, and the situation that the two corners are located on the same side does not belong to the range of the corners. The same side here refers to the same side of a side of the image coordinate area. For the case of lacking a corner, the vertex can be determined according to the extension of the adjacent edges.
In the process, the vertex coordinates of the target document image are judged by establishing a plane coordinate system and an image coordinate area, so that the corner defect condition of the target document image can be quickly detected, and the follow-up process is ensured.
Mode two
After a target document image to be corrected is obtained, performing matrix transformation on the target document image to generate an intermediate image; and under the condition that the matching degree of the intermediate image and the preset standard quadrangle is greater than a preset threshold value, determining that the target document image has a unfilled corner.
For the obtained target document image, performing matrix transformation on the target document image to obtain an intermediate image, where the process of performing matrix transformation on the target document image may be understood as performing stretching processing on the target document image. Before the target document image is stretched, the corresponding width and height after the stretching process are determined according to the size information of the target document image. As shown in fig. 3, in determining the corresponding width and height after the stretching process, the maximum side length w2 is determined as the width w corresponding to the stretching process among the two width-direction side lengths w1 and w2 of the target document image, and the maximum side length h2 is determined as the height h corresponding to the stretching process among the two height-direction side lengths h1 and h2 of the target document image. And after determining the height and width information corresponding to the stretching processing, stretching the target document image to obtain an intermediate image.
After the intermediate image is obtained, the intermediate image is detected, and the matching degree of the generated intermediate image and a preset standard quadrangle is detected, wherein the preset standard quadrangle is a rectangle. And when the matching degree of the detected intermediate image and the preset standard quadrangle is larger than a preset threshold value, determining that the corresponding target document image has no unfilled corner. And when the matching degree of the intermediate image and the preset standard quadrangle is smaller than a preset threshold value, determining that the corresponding target document image has a unfilled corner.
The generated intermediate image is a pentagon for the case of lacking three corners, a hexagon for the case of lacking two corners, and a pentagon for the case of lacking one corner.
In the process, the target document area is deformed, and the deformed target document image is compared with the preset standard quadrangle, so that the unfilled corner condition of the target document image can be accurately and quickly judged.
When the target document image is determined to have no unfilled corner, the target document image can be directly corrected to obtain a document correction image with consistent tone. If it is determined that the target document image has a corner defect, step 102 may be performed.
And 102, under the condition that the target document image has a defect, determining the theme color of the target document image.
When the target document image has a missing corner, the corresponding theme color may be determined for the target document image. When determining the theme color, two corresponding manners may be included, one is automatically determined by the mobile terminal, and the other is determined according to the manual operation of the user, which will be described below.
For the mobile terminal to automatically determine the theme color, the theme color needs to be determined according to the color information in the target document image.
The process of determining the theme color of the target document image comprises the following steps: determining the color of a target coordinate point in a first area adjacent to the unfilled corner area in the target document image as a theme color; or determining the color corresponding to the weighted average value of the RGB values of at least two coordinate point color modes in a second area adjacent to the unfilled corner area in the target document image as the theme color; or, the background color of a third area adjacent to the unfilled corner area in the target document image is determined as the theme color.
Specifically, when determining the theme color, a lacking angle region may be identified for the target document image, then a first region adjacent to the lacking angle region is identified, after the first region is identified, a target coordinate point is determined in the first region, and a color corresponding to the target coordinate point is determined as the theme color.
By determining the theme color in the first area adjacent to the unfilled corner area, the color matching between the unfilled corner area and the first area can be realized, so that the unfilled corner area and the first area can have the same color tone, and the uniformity of the display effect is kept.
Or after the unfilled corner region is identified, a second region adjacent to the unfilled corner region is determined in the target document image, at least two coordinate points are determined in the second region, a corresponding color mode RGB value is obtained for each coordinate point, then a weighted average value of the determined RGB values of the at least two coordinate points is calculated, and a color corresponding to the weighted average value is determined to be a theme color. RGB is a color standard in the industry, and various colors are obtained by changing three color channels of red (R), green (G) and blue (B) and superimposing them on each other. When calculating the RGB weighted average corresponding to the at least two coordinate points, it is necessary to calculate the weighted average for R, G, B, and the RGB weighted average of the at least two coordinate points is formed according to the three weighted averages. It should be noted that, when calculating the weighted average, a weighting factor may also be considered, for example, when determining three coordinate points A, B and C in the second area, where the weight corresponding to coordinate point a is 0.3, the weight corresponding to coordinate point B is 0.5, and the weight corresponding to coordinate point C is 0.2, when calculating the weighted average, it is necessary to calculate the product of the RGB value of coordinate point a and 0.3 to obtain a first reference value, calculate the product of the RGB value of coordinate point B and 0.5 to obtain a second reference value, calculate the product of the RGB value of coordinate point C and 0.2 to obtain a third reference value, then calculate the sum of the first reference value, the second reference value, and the third reference value, and determine the corresponding weighted average according to the ratio of the obtained sum to 3. When the weighting factors are considered, R, G, B in the RGB values need to be calculated, that is, the weighting values of R, G, B at the coordinate point a are all 0.3, the weighting values of R, G, B at the coordinate point B are all 0.5, and the weighting values of R, G, B at the coordinate point C are all 0.2.
The corresponding theme color is determined in a second area adjacent to the unfilled corner area according to the weighted average value of the RGB values of at least two coordinate points, so that the color matching between the unfilled corner area and the second area can be ensured.
Or after the unfilled corner region is identified, a third region adjacent to the unfilled corner region is identified, and then the background color of the third region is determined as the theme color. At this time, the background color of the third region is used as the theme color, and the consistency of the color tones of the unfilled corner region and the third region can be realized.
For determining the theme color of the target document area according to the manual operation of the user, receiving a first input of the user on the target document image; and determining the color corresponding to the first input as the theme color.
Wherein, before receiving a first input of a user on the target document image, the method further comprises: and displaying prompt information, wherein the prompt information is used for prompting the user to select the target area.
In a case where it is determined that the target document image has a missing corner, when the theme color of the target document image is determined, prompt information prompting the user to select a target area on the target document image may be displayed on the display interface before the mobile terminal receives a first input of the user on the target document image. After the prompt message is displayed, the process that the mobile terminal receives the first input of the user on the target document image is as follows: receiving touch input of a user at a target position of a target document image; a preset range area including the target position is determined as a target area.
The mobile terminal receives touch input of a user to a target position in a target document image after displaying the prompt information, the target position can be displayed in a color capable of distinguishing other positions after the touch input at the target position is obtained, then the touch input received at the target position is responded, namely a preset range area including the target position is determined according to the target position, and the preset range area is determined as the target area. The touch input of the user to the target position can meet a preset condition, for example, the touch duration is greater than a preset duration and/or the touch strength is greater than a preset strength.
After the target area is determined, a step of determining a color corresponding to the first input as a subject color is performed, and at this time, a first color occupying the largest area in the target area is determined as the subject color. The specific process is to search the first color with the largest occurrence frequency in the target area, namely the first color occupying the largest total area in the target area. After the first color is determined, the first color is determined as the subject color of the target document image.
Wherein, before receiving a first input of a user on the target document image, the method further comprises: and displaying the color card information. In the case where it is determined that the target document image has a missing corner, when determining the theme color of the target document image, the color chart information may be displayed before the mobile terminal receives a first input of the user on the target document image. After the color chart information is displayed, the process of receiving the first input of the user on the target document image is as follows: and receiving touch input of a user on the color card information.
After the mobile terminal displays the color card information, the mobile terminal receives the touch input of the user on the color card information for the color, and after the touch input of the user on the color card information is obtained, the step of determining the color corresponding to the first input as the theme color is executed, and at this time, the second color corresponding to the touch input can be determined as the theme color. That is, the subject color is determined according to the color information determined by the user on the color chart information.
Certainly, there may be other embodiments, the mobile terminal may automatically generate a reference color according to the target document image, and after the mobile terminal generates the reference color, perform adjustment processing on the reference color according to the color selected by the user on the color chart information, and determine the color after the adjustment processing as the theme color corresponding to the target document image.
After the theme color of the target document image is determined, step 103 is performed.
And 103, adopting the theme color to fill the color of the unfilled corner area of the target document image and outputting a document correction image.
After the theme color of the target document image is acquired, the unfilled corner regions of the target document image may be filled in according to the theme color to acquire a document correction image.
The method comprises the steps of adopting theme colors to fill the unfilled corner areas of a target document image with colors, and when a document correction image is output, correspondingly outputting different modes of the document correction image according to different modes of judging the unfilled corner areas. In the first method for determining the unfilled corner region, the corresponding method for outputting the document correction image is as follows: generating a corresponding reference correction image according to the target document image, wherein the reference correction image is a maximum rectangular image corresponding to the target document image; filling background color into the reference corrected image by adopting the theme color; performing matrix transformation on the target document image to generate an intermediate image; and synthesizing the intermediate image and the reference correction image to output a document correction image.
Firstly, a corresponding reference correction image needs to be generated according to a current target document image, when the reference correction image is generated, the maximum side length needs to be determined from the side lengths in the two width directions of the target document image as width information, and the maximum side length needs to be determined from the side lengths in the two height directions of the target document image as height information. And forming a rectangle according to the determined width information and the determined height information, namely, referring to the corrected image as the maximum rectangular image corresponding to the target document image. After the reference corrected image is generated, the reference corrected image is ground-filled according to the determined subject color of the target document image. And then performing matrix transformation on the target document image to generate an intermediate image, wherein the matrix transformation processing is to perform stretching processing on the target document image, and the generation process of the intermediate image is not described in detail herein.
After the intermediate image is generated, a document correction image is generated from the intermediate image and the reference correction image after the ground color filling. The method specifically comprises the following steps: and determining corresponding contour information in the reference corrected image after the ground color filling according to the contour information of the intermediate image, matting out a contour region corresponding to the contour information in the reference corrected image after the ground color filling according to the determined contour information, supplementing the intermediate image into the corresponding contour region, and outputting a document corrected image.
In the second method for determining the unfilled corner region, the corresponding method for outputting the document correction image is as follows: generating a reference correction image according to the intermediate image, wherein the reference correction image is a maximum rectangular image corresponding to the target document image; determining the non-overlapped part of the reference correction image and the intermediate image as a unfilled corner transformation image corresponding to the unfilled corner region; adopting a theme color to fill the color of the unfilled corner transformation image; and synthesizing the unfilled corner conversion image and the intermediate image, and outputting a document correction image.
The target document image may be first subjected to matrix transformation, and an intermediate image may be generated after the matrix transformation. The process of matrix transformation is a process of stretching the target document image. After the intermediate image is generated, a reference corrected image is generated from the intermediate image. The process of generating the reference corrected image according to the intermediate image is a process of performing region supplement on the intermediate image to obtain a reference corrected image (a complete rectangular image), wherein the reference corrected image is a rectangular image determined according to two maximum side lengths of the target document image. After the reference correction image is obtained, the reference correction image is compared with the intermediate image, the non-overlapping part of the reference correction image and the intermediate image is determined, and the non-overlapping part is determined to be a unfilled corner conversion image corresponding to the unfilled corner region. After determining the unfilled corner transformed image, color filling is performed on the unfilled corner transformed image according to the theme color of the target document image. And after the unfilled corner conversion image is subjected to color filling, synthesizing the unfilled corner conversion image subjected to color filling and the intermediate image, and outputting a document correction image.
It should be noted that, for the boundary portion between the unfilled corner region and the non-unfilled corner region, the color can be adjusted by a gradual change method, so as to improve the effect of filling the boundary between the color and the original image, and make the color more natural.
In summary, the embodiment of the present invention can achieve obtaining of the document correction image with consistent color tone, ensure the nature and uniformity of the display effect of the document correction image, and solve the problems in the prior art that when the unfilled corner region of the document image is filled with pure color, the color difference is obvious, the display effect is obtrusive, and the use of the user is affected.
According to the embodiment of the invention, the target document image to be corrected is obtained, the theme color of the target document image is determined when the target document image has the unfilled corner, the unfilled corner area of the target document image is subjected to color filling according to the theme color, the document correction image is output, the document correction image with consistent color tone can be obtained, the nature and uniformity of the display effect of the document correction image are ensured, and the use effect of the document correction image can be further ensured.
An embodiment of the present invention further provides a mobile terminal, as shown in fig. 4, including:
a first obtaining module 401, configured to obtain a target document image to be corrected;
a first determining module 402, configured to determine a theme color of the target document image when the target document image has a missing corner;
and the processing module 403 is configured to perform color filling on the unfilled corner region of the target document image by using the theme color, and output a document correction image.
Wherein, mobile terminal still includes:
a second obtaining module 404, configured to obtain a preset-size image including a target document image after the first obtaining module 401 obtains the target document image to be corrected;
an establishing module 405, configured to establish an image coordinate area according to an image with a preset size;
a third obtaining module 406, configured to obtain vertex coordinates corresponding to the target document image;
and the second determining module 407 is configured to determine the unfilled corner state of the target document image according to the position relationship between the vertex coordinates and the image coordinate area.
Wherein, mobile terminal still includes:
the generating module 408 is configured to perform matrix transformation on the target document image to generate an intermediate image after the first obtaining module 401 obtains the target document image to be corrected;
and a third determining module 409, configured to determine that a missing corner exists in the target document image when the matching degree between the intermediate image and the preset standard quadrangle is greater than a preset threshold.
Wherein the first determining module 402 is configured to:
determining the color of a target coordinate point in a first area adjacent to the unfilled corner area in the target document image as a theme color;
or determining the color corresponding to the weighted average value of the RGB values of at least two coordinate point color modes in a second area adjacent to the unfilled corner area in the target document image as the theme color;
or, the background color of a third area adjacent to the unfilled corner area in the target document image is determined as the theme color.
Wherein the first determining module 402 comprises:
the receiving sub-module 4021 is used for receiving a first input of a user on the target document image;
the first determining sub-module 4022 is configured to determine a color corresponding to the first input as a theme color.
Wherein the first determining module 402 further comprises:
the first display sub-module 4023 is configured to display a prompt message for prompting the user to select a target area before the receiving sub-module 4021 receives a first input of the user on the target document image;
the receiving sub-module 4021 is further configured to:
receiving touch input of a user at a target position of a target document image;
determining a preset range area including a target position as a target area;
the first determination sub-module 4022 is further configured to:
and determining the first color with the largest occupied area in the target area as the theme color.
Wherein the first determining module 402 further comprises:
the second display sub-module 4024 is configured to display the color chart information before the receiving sub-module 4021 receives the first input of the user on the target document image;
the receiving sub-module 4021 is further configured to:
receiving touch input of a user on the color card information;
the first determination sub-module 4022 is further configured to:
and determining a second color corresponding to the touch input as a theme color.
Wherein, the processing module 403 includes:
the first generation submodule 4031 is used for generating a corresponding reference correction image according to the target document image, wherein the reference correction image is a maximum rectangular image corresponding to the target document image;
a first fill sub-module 4032 for performing ground color filling on the reference corrected image with the subject color;
the second generation submodule 4033 is used for performing matrix transformation on the target document image to generate an intermediate image;
the first processing sub-module 4034 is configured to perform image synthesis on the intermediate image and the reference corrected image, and output a document corrected image.
Wherein, the processing module 403 includes:
a third generation submodule 4035, configured to generate a reference corrected image according to the intermediate image, where the reference corrected image is a maximum rectangular image corresponding to the target document image;
a second determining submodule 4036, configured to determine a non-overlapping portion of the reference corrected image and the intermediate image as a missing corner transform image corresponding to the missing corner region;
a second filling sub-module 4037, configured to perform color filling on the unfilled corner transformed image by using a theme color;
and the second processing submodule 4038 is used for performing image synthesis on the unfilled corner transformation image and the intermediate image and outputting a document correction image.
The mobile terminal according to the embodiment of the present invention can implement each process implemented by the mobile terminal in the method embodiment of fig. 1, and is not described herein again to avoid repetition.
Therefore, by acquiring the target document image to be corrected, determining the theme color of the target document image when the target document image has a defect angle, performing color filling on the defect angle area of the target document image according to the theme color, outputting the document correction image, acquiring the document correction image with consistent color tone, ensuring the nature and uniformity of the display effect of the document correction image, and further ensuring the use effect of the document correction image.
Fig. 5 is a schematic diagram of a hardware structure of a mobile terminal for implementing various embodiments of the present invention, where the mobile terminal 500 includes, but is not limited to: a radio frequency unit 501, a network module 502, an audio output unit 503, an input unit 504, a sensor 505, a display unit 506, a user input unit 507, an interface unit 508, a memory 509, a processor 510, and a power supply 511. Those skilled in the art will appreciate that the mobile terminal architecture shown in fig. 5 is not intended to be limiting of mobile terminals, and that a mobile terminal may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the mobile terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.
Optionally, after acquiring the target document image to be corrected, the processor 510 is further configured to perform the following steps: acquiring a preset size image containing a target document image; establishing an image coordinate area according to the image with the preset size; acquiring vertex coordinates corresponding to a target document image; and determining the unfilled corner state of the target document image according to the position relation between the vertex coordinates and the image coordinate area.
Optionally, after acquiring the target document image to be corrected, the processor 510 is further configured to perform the following steps: performing matrix transformation on the target document image to generate an intermediate image; and under the condition that the matching degree of the intermediate image and the preset standard quadrangle is greater than a preset threshold value, determining that the target document image has a unfilled corner.
Optionally, when determining the theme color of the target document image, the processor 510 is further configured to perform the following steps: determining the color of a target coordinate point in a first area adjacent to the unfilled corner area in the target document image as a theme color; or determining the color corresponding to the weighted average value of the RGB values of at least two coordinate point color modes in a second area adjacent to the unfilled corner area in the target document image as the theme color; or, the background color of a third area adjacent to the unfilled corner area in the target document image is determined as the theme color.
Optionally, when determining the theme color of the target document image, the processor 510 is further configured to perform the following steps: receiving a first input of a user on a target document image; and determining the color corresponding to the first input as the theme color.
Optionally, before receiving the first input of the user on the target document image, the processor 510 is further configured to perform the following steps: displaying prompt information, wherein the prompt information is used for prompting a user to select a target area; receiving a first input by the user on the target document image, processor 510 is further configured to: receiving touch input of a user at a target position of a target document image; determining a preset range area including a target position as a target area; when the color corresponding to the first input is determined as the theme color, the processor 510 is further configured to perform the following steps: and determining the first color with the largest occupied area in the target area as the theme color.
Optionally, before receiving the first input of the user on the target document image, the processor 510 is further configured to perform the following steps: displaying the color card information; receiving a first input by the user on the target document image, processor 510 is further configured to: receiving touch input of a user on the color card information; when the color corresponding to the first input is determined as the theme color, the processor 510 is further configured to perform the following steps: and determining a second color corresponding to the touch input as a theme color.
Optionally, the processor 510 is further configured to perform the following steps when the color of the theme is adopted to fill the unfilled corner region of the target document image with color and the document correction image is output: generating a corresponding reference correction image according to the target document image, wherein the reference correction image is a maximum rectangular image corresponding to the target document image; filling background color into the reference corrected image by adopting the theme color; performing matrix transformation on the target document image to generate an intermediate image; and synthesizing the intermediate image and the reference correction image to output a document correction image.
Optionally, the processor 510 is further configured to perform the following steps when the color of the theme is adopted to fill the unfilled corner region of the target document image with color and the document correction image is output: generating a reference correction image according to the intermediate image, wherein the reference correction image is a maximum rectangular image corresponding to the target document image; determining the non-overlapped part of the reference correction image and the intermediate image as a unfilled corner transformation image corresponding to the unfilled corner region; adopting a theme color to fill the color of the unfilled corner transformation image; and synthesizing the unfilled corner conversion image and the intermediate image, and outputting a document correction image.
Therefore, by acquiring the target document image to be corrected, determining the theme color of the target document image when the target document image has a defect angle, performing color filling on the defect angle area of the target document image according to the theme color, outputting the document correction image, acquiring the document correction image with consistent color tone, ensuring the nature and uniformity of the display effect of the document correction image, and further ensuring the use effect of the document correction image.
It should be understood that, in the embodiment of the present invention, the radio frequency unit 501 may be used for receiving and sending signals during a message sending and receiving process or a call process, and specifically, receives downlink data from a base station and then processes the received downlink data to the processor 510; in addition, the uplink data is transmitted to the base station. In general, radio frequency unit 501 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 501 can also communicate with a network and other devices through a wireless communication system.
The mobile terminal provides the user with wireless broadband internet access through the network module 502, such as helping the user send and receive e-mails, browse webpages, access streaming media, and the like.
The audio output unit 503 may convert audio data received by the radio frequency unit 501 or the network module 502 or stored in the memory 509 into an audio signal and output as sound. Also, the audio output unit 503 may also provide audio output related to a specific function performed by the mobile terminal 500 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 503 includes a speaker, a buzzer, a receiver, and the like.
The input unit 504 is used to receive an audio or video signal. The input Unit 504 may include a Graphics Processing Unit (GPU) 5041 and a microphone 5042, and the Graphics processor 5041 processes image data of a still picture or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 506. The image frames processed by the graphic processor 5041 may be stored in the memory 509 (or other storage medium) or transmitted via the radio frequency unit 501 or the network module 502. The microphone 5042 may receive sounds and may be capable of processing such sounds into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 501 in case of the phone call mode.
The mobile terminal 500 also includes at least one sensor 505, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that adjusts the brightness of the display panel 5061 according to the brightness of ambient light, and a proximity sensor that turns off the display panel 5061 and/or a backlight when the mobile terminal 500 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the posture of the mobile terminal (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), and vibration identification related functions (such as pedometer, tapping); the sensors 505 may also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., which are not described in detail herein.
The display unit 506 is used to display information input by the user or information provided to the user. The Display unit 506 may include a Display panel 5061, and the Display panel 5061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.
The user input unit 507 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the mobile terminal. Specifically, the user input unit 507 includes a touch panel 5071 and other input devices 5072. Touch panel 5071, also referred to as a touch screen, may collect touch operations by a user on or near it (e.g., operations by a user on or near touch panel 5071 using a finger, stylus, or any suitable object or attachment). The touch panel 5071 may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 510, and receives and executes commands sent by the processor 510. In addition, the touch panel 5071 may be implemented in various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 5071, the user input unit 507 may include other input devices 5072. In particular, other input devices 5072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein.
Further, the touch panel 5071 may be overlaid on the display panel 5061, and when the touch panel 5071 detects a touch operation thereon or nearby, the touch operation is transmitted to the processor 510 to determine the type of the touch event, and then the processor 510 provides a corresponding visual output on the display panel 5061 according to the type of the touch event. Although in fig. 5, the touch panel 5071 and the display panel 5061 are two independent components to implement the input and output functions of the mobile terminal, in some embodiments, the touch panel 5071 and the display panel 5061 may be integrated to implement the input and output functions of the mobile terminal, and is not limited herein.
The interface unit 508 is an interface through which an external device is connected to the mobile terminal 500. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 508 may be used to receive input (e.g., data information, power, etc.) from external devices and transmit the received input to one or more elements within the mobile terminal 500 or may be used to transmit data between the mobile terminal 500 and external devices.
The memory 509 may be used to store software programs as well as various data. The memory 509 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 509 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device.
The processor 510 is a control center of the mobile terminal, connects various parts of the entire mobile terminal using various interfaces and lines, and performs various functions of the mobile terminal and processes data by operating or executing software programs and/or modules stored in the memory 509 and calling data stored in the memory 509, thereby performing overall monitoring of the mobile terminal. Processor 510 may include one or more processing units; preferably, the processor 510 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into processor 510.
The mobile terminal 500 may further include a power supply 511 (e.g., a battery) for supplying power to various components, and preferably, the power supply 511 may be logically connected to the processor 510 via a power management system, so that functions of managing charging, discharging, and power consumption are performed via the power management system.
In addition, the mobile terminal 500 includes some functional modules that are not shown, and thus, are not described in detail herein.
Preferably, an embodiment of the present invention further provides a mobile terminal, which includes a processor 510, a memory 509, and a computer program that is stored in the memory 509 and can be run on the processor 510, and when the computer program is executed by the processor 510, the computer program implements each process of the above-mentioned document image correction method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not described here again.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the above-mentioned document image correction method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (16)
1. A document image correction method, comprising:
acquiring a target document image to be corrected;
under the condition that the target document image has a default, determining the theme color of the target document image;
adopting the theme color to fill the color of the unfilled corner area of the target document image and outputting a document correction image; according to different modes of judging the unfilled corner area, correspondingly comprising different modes of outputting a document correction image;
the determining the theme color of the target document image comprises:
receiving a first input of a user on the target document image;
and determining the color corresponding to the first input as the theme color.
2. The document image correction method according to claim 1, wherein after the target document image to be corrected is acquired, the method further comprises:
acquiring a preset size image containing the target document image;
establishing an image coordinate area according to the image with the preset size;
acquiring vertex coordinates corresponding to the target document image;
and determining the unfilled corner state of the target document image according to the position relation between the vertex coordinates and the image coordinate area.
3. The document image correction method according to claim 1, wherein after the target document image to be corrected is acquired, the method further comprises:
performing matrix transformation on the target document image to generate an intermediate image;
and determining that the target document image has a unfilled corner under the condition that the matching degree of the intermediate image and a preset standard quadrangle is greater than a preset threshold value.
4. The document image correction method according to claim 1, wherein, before the receiving of the first input by the user on the target document image, further comprising:
displaying prompt information, wherein the prompt information is used for prompting a user to select a target area;
the receiving a first input of a user on the target document image comprises:
receiving touch input of a user at a target position of the target document image;
determining a preset range area including the target position as a target area;
the determining the color corresponding to the first input as the theme color comprises:
and determining the first color with the largest occupied area in the target area as the theme color.
5. The document image correction method according to claim 1, wherein, before the receiving of the first input by the user on the target document image, further comprising:
displaying the color card information;
the receiving a first input of a user on the target document image comprises:
receiving touch input of a user on the color card information;
the determining the color corresponding to the first input as the theme color comprises:
and determining a second color corresponding to the touch input as a theme color.
6. The document image correction method according to claim 2, wherein the color filling of the unfilled corner region of the target document image with the theme color to output a document correction image comprises:
generating a corresponding reference correction image according to the target document image, wherein the reference correction image is a maximum rectangular image corresponding to the target document image;
filling ground colors in the reference corrected image by adopting the theme colors;
performing matrix transformation on the target document image to generate an intermediate image;
and synthesizing the intermediate image and the reference correction image to output a document correction image.
7. The document image correction method according to claim 3, wherein the color filling of the unfilled corner region of the target document image with the theme color to output a document correction image comprises:
generating a reference correction image according to the intermediate image, wherein the reference correction image is a maximum rectangular image corresponding to the target document image;
determining the non-overlapped part of the reference correction image and the intermediate image as a unfilled corner transformation image corresponding to the unfilled corner region;
adopting the theme color to fill the color of the unfilled corner transformation image;
and synthesizing the unfilled corner transformation image and the intermediate image to output a document correction image.
8. A mobile terminal, comprising:
the first acquisition module is used for acquiring a target document image to be corrected;
the first determination module is used for determining the theme color of the target document image under the condition that the target document image has a missing corner;
the processing module is used for filling the color of the unfilled corner area of the target document image by adopting the theme color and outputting a document correction image; according to different modes of judging the unfilled corner area, correspondingly comprising different modes of outputting a document correction image;
the first determining module includes:
the receiving submodule is used for receiving a first input of a user on the target document image;
and the first determining submodule is used for determining the color corresponding to the first input as the theme color.
9. The mobile terminal of claim 8, wherein the mobile terminal further comprises:
the second acquisition module is used for acquiring a preset size image containing a target document image after the first acquisition module acquires the target document image to be corrected;
the establishing module is used for establishing an image coordinate area according to the image with the preset size;
the third acquisition module is used for acquiring the vertex coordinates corresponding to the target document image;
and the second determining module is used for determining the unfilled corner state of the target document image according to the position relation between the vertex coordinate and the image coordinate area.
10. The mobile terminal of claim 8, wherein the mobile terminal further comprises:
the generating module is used for performing matrix transformation on the target document image to generate an intermediate image after the first acquiring module acquires the target document image to be corrected;
and the third determining module is used for determining that the target document image has a unfilled corner under the condition that the matching degree of the intermediate image and a preset standard quadrangle is greater than a preset threshold value.
11. The mobile terminal of claim 8, wherein the first determining module further comprises:
the first display sub-module is used for displaying prompt information before the receiving sub-module receives first input of a user on the target document image, and the prompt information is used for prompting the user to select a target area;
the receiving submodule is further configured to:
receiving touch input of a user at a target position of the target document image;
determining a preset range area including the target position as a target area;
the first determination submodule is further configured to:
and determining the first color with the largest occupied area in the target area as the theme color.
12. The mobile terminal of claim 8, wherein the first determining module further comprises:
the second display sub-module is used for displaying the color card information before the receiving sub-module receives the first input of the user on the target document image;
the receiving submodule is further configured to:
receiving touch input of a user on the color card information;
the first determination submodule is further configured to:
and determining a second color corresponding to the touch input as a theme color.
13. The mobile terminal of claim 9, wherein the processing module comprises:
the first generation submodule is used for generating a corresponding reference correction image according to the target document image, wherein the reference correction image is a maximum rectangular image corresponding to the target document image;
a first filling sub-module, configured to perform ground color filling on the reference corrected image by using the theme color;
the second generation submodule is used for performing matrix transformation on the target document image to generate an intermediate image;
and the first processing submodule is used for carrying out image synthesis on the intermediate image and the reference corrected image and outputting a document corrected image.
14. The mobile terminal of claim 10, wherein the processing module comprises:
a third generation submodule, configured to generate a reference corrected image according to the intermediate image, where the reference corrected image is a largest rectangular image corresponding to the target document image;
the second determining submodule is used for determining the non-overlapped part of the reference correction image and the intermediate image as a unfilled corner conversion image corresponding to the unfilled corner region;
the second filling sub-module is used for filling the color of the unfilled corner transformation image by adopting the theme color;
and the second processing submodule is used for carrying out image synthesis on the unfilled corner conversion image and the intermediate image and outputting a document correction image.
15. A mobile terminal, characterized in that it comprises a processor, a memory and a computer program stored on said memory and executable on said processor, said computer program, when executed by said processor, implementing the steps of the document image correction method according to any one of claims 1 to 7.
16. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the document image correction method according to any one of claims 1 to 7.
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