CN111145104B - Method and terminal for restoring picture brightness and contrast - Google Patents
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- CN111145104B CN111145104B CN201911214027.XA CN201911214027A CN111145104B CN 111145104 B CN111145104 B CN 111145104B CN 201911214027 A CN201911214027 A CN 201911214027A CN 111145104 B CN111145104 B CN 111145104B
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Abstract
The invention discloses a method and a terminal for restoring picture brightness and contrast, which read an XML file under a PPTX file; traversing the XML file, and determining the picture processed by the album; acquiring the brightness, contrast and picture resources of the processed picture according to the picture processed by the photo album; and restoring the brightness and the contrast of the picture resource by using an image processing algorithm corresponding to the brightness and the contrast, and analyzing the brightness and the contrast data of the picture in the PPTX file to ensure that the picture resource can also simulate PowerPoint without album processing of the PowerPoint, thereby realizing the accurate restoration of the setting effect of the brightness and the contrast of the picture.
Description
Technical Field
The invention relates to the field of image processing, in particular to a method and a terminal for restoring picture brightness and contrast.
Background
At present, in order to achieve the effect of copying brightness and contrast of an original picture to a PowerPoint, the original picture in a PPTX file is extracted, the PPTX file is opened in compressed software, a folder named "PPT" appears on a software interface, the folder contains a file named "media", all unprocessed original pictures in the PPT are stored under the file, the original pictures are imported into the PowerPoint, and corresponding brightness and contrast are selected for processing.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method and the terminal for restoring the brightness and the contrast of the picture can effectively analyze the brightness and the contrast of the picture in the PPTX file and restore the setting effect of the brightness and the contrast of the original picture.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method for restoring brightness and contrast of a picture comprises the following steps:
s1, reading an XML file under a PPTX file;
s2, traversing the XML file, and determining the picture processed by the album;
s3, acquiring the brightness, contrast and picture resources of the processed picture according to the picture processed by the photo album;
and S4, restoring the brightness and the contrast of the picture resource by using an image processing algorithm corresponding to the brightness and the contrast.
In order to solve the technical problem, the invention adopts another technical scheme as follows:
a terminal for restoring brightness and contrast of a picture, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
s1, reading an XML file under a PPTX file;
s2, traversing the XML file, and determining the picture processed by the album;
s3, acquiring the brightness, the contrast and the picture resource of the processed picture according to the picture processed by the album;
and S4, restoring the brightness and the contrast of the picture resource by using an image processing algorithm corresponding to the brightness and the contrast.
The invention has the beneficial effects that: traversing an XML file read under the PPTX file, determining a picture processed by an album, obtaining the brightness, contrast and picture resource of the picture processed, and processing the picture resource by using a corresponding image processing algorithm to finish the effect restoration of the picture resource. Reading an XML file in a PPTX file, realizing accurate acquisition of attributes of each element in PPT, traversing the XML file, determining a picture processed by an album, effectively analyzing corresponding brightness and contrast data according to the picture, acquiring picture resources, and processing the picture resources by using a corresponding picture processing algorithm according to the brightness and contrast obtained by analysis, so that the picture resources are not processed by the album of PowerPoint and the PowerPoint can be simulated by analyzing the picture effect, thereby achieving the purpose of accurately restoring the setting effect of the brightness and the contrast of the picture.
Drawings
FIG. 1 is a flowchart illustrating steps of a method for restoring brightness and contrast of a picture according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a terminal for restoring brightness and contrast of a picture according to an embodiment of the present invention;
description of reference numerals:
1. a terminal for restoring the brightness and contrast of a picture; 2. a memory; 3. a processor.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, a method for restoring brightness and contrast of a picture includes the steps of:
s1, reading an XML file under a PPTX file;
s2, traversing the XML file, and determining the picture processed by the album;
s3, acquiring the brightness, contrast and picture resources of the processed picture according to the picture processed by the photo album;
and S4, restoring the brightness and the contrast of the picture resource by using an image processing algorithm corresponding to the brightness and the contrast.
As can be seen from the above description, the beneficial effects of the present invention are: traversing an XML file read under the PPTX file, determining a picture processed by an album, obtaining the brightness, contrast and picture resource of the picture processed, and processing the picture resource by using a corresponding image processing algorithm to finish the effect restoration of the picture resource. Reading an XML file in a PPTX file, realizing accurate acquisition of attributes of each element in PPT, traversing the XML file, determining a picture processed by an album, effectively analyzing corresponding brightness and contrast data according to the picture, acquiring picture resources, and processing the picture resources by using a corresponding picture processing algorithm according to the brightness and contrast obtained by analysis, so that the picture resources are not processed by the album of PowerPoint and the PowerPoint can be simulated by analyzing the picture effect, thereby achieving the purpose of accurately restoring the setting effect of the brightness and the contrast of the picture.
Further, the step S2 includes:
acquiring all PPT page numbers in the XML file, traversing picture nodes in the PPT page numbers, judging whether a node related to album processing exists under the picture nodes, if so, executing the step S3, and if not, not processing.
According to the description, the setting of the brightness and the contrast of the picture is a photo album processing mode in PowerPoint, whether the picture is processed by the photo album is judged firstly, the efficiency of effective information retrieval of the picture can be improved, and time consumption and resource waste caused by analyzing the picture which is not processed by the photo album are avoided.
Further, the step S3 includes:
s31, traversing child nodes under the picture nodes, and storing the picture brightness and contrast numerical values and the unique identifications of the pictures in an array in a JSON data format in a one-to-one correspondence manner;
s32, traversing all the unique identifiers stored in the array, and respectively executing the following steps for each unique identifier:
s321, matching a relative path of the corresponding picture resource in the page resource association file according to the unique identifier, and acquiring the picture resource by using the relative path;
s322, binding the acquired picture resources with the corresponding picture brightness and contrast values, and storing the picture resources in a project directory in a file form.
According to the description, the JSON array is used for storing the picture brightness and contrast numerical values and the unique identification of the picture, data transmission is facilitated, redundant characters are reduced, the corresponding relation between data can be visually displayed through the special key value of the JSON array and the data structure, the relative path of the picture resource is obtained according to the unique identification of the picture, the unique identification of the picture is the unique ID for identifying the picture, the reliability of the result can be ensured through the picture resource obtained based on the unique identification, the picture resource and the corresponding picture brightness and contrast are bound, when the picture resource is processed subsequently, the brightness and the contrast can be directly obtained according to the binding relation, and the picture effect reduction efficiency is improved.
Further, the step S4 includes:
traversing all the picture resources stored in the project directory, and respectively executing the following steps on each picture resource:
reading picture brightness and contrast numerical values corresponding to the transmitted picture resources according to the data format parameters of the picture resources, and restoring the picture brightness and contrast of the picture resources by using an image processing algorithm corresponding to the picture brightness and contrast numerical values.
As can be seen from the above description, due to the binding relationship between the picture resource and the corresponding picture brightness and contrast, when the data format parameter of the picture resource is read, the acquisition of the brightness and contrast can be directly realized, and the picture resource is processed by using the image processing algorithm corresponding to the brightness and contrast, so that the picture resource is not processed by the PowerPoint album, and the effect restoration of the picture brightness and contrast can also be realized.
Further, the performing, in the step S4, the image brightness and contrast restoration on the image resource by using the image processing algorithm corresponding to the image brightness and contrast value includes:
traversing all pixels of the picture resource, and respectively executing for each pixel:
and obtaining the color value of the pixel, and reassigning the color value of the pixel according to the color value of the pixel and the picture brightness and contrast numerical value corresponding to the picture resource.
As can be seen from the above description, the pixels are basic units that form the picture, and all the pixels of the picture resource are traversed, and the color values of the pixels are reassigned one by one according to the brightness and contrast values corresponding to the picture resource, which is helpful for performing more accurate effect restoration on the picture.
Referring to fig. 2, a terminal for restoring brightness and contrast of a picture includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program:
s1, reading an XML file under a PPTX file;
s2, traversing the XML file, and determining the picture processed by the album;
s3, acquiring the brightness, contrast and picture resources of the processed picture according to the picture processed by the photo album;
and S4, restoring the brightness and the contrast of the picture resource by using an image processing algorithm corresponding to the brightness and the contrast.
As can be seen from the above description, the beneficial effects of the present invention are: traversing an XML file read under the PPTX file, determining a picture processed by an album, obtaining the brightness, contrast and picture resource of the picture processed, and processing the picture resource by using a corresponding image processing algorithm to finish the effect restoration of the picture resource. Reading an XML file in a PPTX file, realizing accurate acquisition of each element attribute in PPT, traversing the XML file, determining a picture processed by an album, effectively analyzing corresponding brightness and contrast data according to the picture, acquiring picture resources, and processing the picture resources according to the brightness and contrast obtained by analysis by using a corresponding picture processing algorithm, so that the picture resources are not processed by the album of PowerPoint and can also simulate PowerPoint by analyzing the picture effect, thereby achieving the purpose of accurately restoring the setting effect of the brightness and contrast of the picture.
Further, the step S2 includes:
acquiring all PPT page numbers in the XML file, traversing picture nodes in the PPT page numbers, judging whether the picture nodes have nodes related to album processing, if yes, executing the step S3, and if not, not processing.
According to the description, the setting of the brightness and the contrast of the picture is a photo album processing mode in PowerPoint, whether the picture is processed by the photo album is judged firstly, the efficiency of effective information retrieval of the picture can be improved, and time consumption and resource waste caused by analyzing the picture which is not processed by the photo album are avoided.
Further, the step S3 includes:
s31, traversing child nodes under the picture nodes, and storing the picture brightness and contrast numerical values and the unique identifications of the pictures in an array in a JSON data format in a one-to-one correspondence manner;
s32, traversing all the unique identifiers stored in the array, and respectively executing the following steps to each unique identifier:
s321, matching a relative path of the corresponding picture resource in the page resource association file according to the unique identifier, and acquiring the picture resource by using the relative path;
s322, binding the acquired picture resources and the corresponding picture brightness and contrast values thereof, and storing the picture resources in a project directory in a file form.
According to the description, the JSON array is used for storing the picture brightness and contrast numerical values and the unique identification of the picture, data transmission is facilitated, redundant characters are reduced, the corresponding relation between data can be visually displayed through the special key value of the JSON array and the data structure, the relative path of the picture resource is obtained according to the unique identification of the picture, the unique identification of the picture is the unique ID for identifying the picture, the reliability of the result can be ensured through the picture resource obtained based on the unique identification, the picture resource and the corresponding picture brightness and contrast are bound, when the picture resource is processed subsequently, the brightness and the contrast can be directly obtained according to the binding relation, and the picture effect reduction efficiency is improved.
Further, the step S4 includes:
traversing all the picture resources stored in the project directory, and respectively executing the following steps on each picture resource:
reading picture brightness and contrast numerical values corresponding to the transferred picture resources according to the data format parameters of the picture resources, and restoring the picture brightness and contrast of the picture resources by using an image processing algorithm corresponding to the picture brightness and contrast numerical values.
As can be seen from the above description, due to the binding relationship between the picture resource and the corresponding picture brightness and contrast, when the data format parameter of the picture resource is read, the acquisition of the brightness and contrast can be directly realized, and the picture resource is processed by using the image processing algorithm corresponding to the brightness and contrast, so that the picture resource is not processed by the PowerPoint album, and the effect restoration of the picture brightness and contrast can also be realized.
Further, the performing, in the step S4, the image brightness and contrast restoration on the image resource by using the image processing algorithm corresponding to the image brightness and contrast value includes:
traversing all pixels of the picture resource, and respectively executing for each pixel:
and obtaining the color value of the pixel, and reassigning the color value of the pixel according to the color value of the pixel and the picture brightness and contrast numerical value corresponding to the picture resource.
As can be seen from the above description, the pixels are basic units that form the picture, and all the pixels of the picture resource are traversed, and the color values of the pixels are reassigned one by one according to the brightness and contrast values corresponding to the picture resource, which is helpful for performing more accurate effect restoration on the picture.
Example one
Referring to fig. 1, a method for restoring brightness and contrast of an image includes the following steps:
s1, reading an XML file under a PPTX file;
decompressing the designated file content in the PPTX compression format file by using a zlib function library, and reading an XML file in the designated file content by using an RAPIDxml analysis library;
s2, traversing the XML file, and determining the picture processed by the album;
specifically, the step S2 includes:
acquiring all PPT page numbers in the XML file, traversing picture nodes in the PPT page numbers, judging whether the picture nodes have nodes related to album processing, if yes, executing the step S3, and if not, not processing.
Acquiring all contents in a slides directory under a PPT directory in a PPTX file decompression directory, wherein the contents are XML files representing all page contents of PPT, slide #. XML is the specific contents of PPT pages, slide #. XML is a page resource associated file of PPT pages, picture nodes p: pic under all slide #. XML files are traversed, and when the attribute value of isophoto in p: nvPicPr under the node is 1, the picture corresponding to the picture node is processed by an album;
s3, acquiring the brightness, the contrast and the picture resource of the processed picture according to the picture processed by the album;
specifically, the step S3 includes:
s31, traversing child nodes under the picture nodes, and storing the picture brightness and contrast numerical values and the unique identifications of the pictures in an array in a JSON data format in a one-to-one correspondence manner;
traversing a p: blipFill node under the picture node, wherein an a: lum node is certainly existed in an a: blip sub-node under the node, a bright attribute value in the a: lum node represents the brightness value of the picture, a contrast attribute value represents the contrast value of the picture, wherein the contrast value and the brightness value are converted into a thousandth ratio by dividing by 1000, an r: embed value in the a: blip node is obtained, and the r: embed value represents the unique identifier of the picture, and the contrast value, the brightness value and the corresponding unique identifier obtained by analysis are correspondingly stored in an array in a JSON data format one by one;
s32, traversing all the unique identifiers stored in the array, and respectively executing the following steps for each unique identifier:
s321, matching a relative path of the corresponding picture resource in the page resource association file according to the unique identifier, and acquiring the picture resource by using the relative path;
matching a Target attribute representing a picture resource relative path under a Relationship node corresponding to the embed value in a page resource associated file slide #. Xml.rels corresponding to the page number of the embed value according to the r, and acquiring the picture resource by using the relative path;
s322, binding the acquired picture resources with the corresponding picture brightness and contrast values, and storing the picture resources in a project directory in a file form.
The method comprises the steps that the corresponding relation between the picture resource and the corresponding brightness and contrast is obtained according to the corresponding relation between the unique identification of the picture and the corresponding brightness and contrast of the picture and the corresponding relation between the unique identification of the picture and the picture resource, the picture resource and the corresponding brightness and contrast are bound according to the corresponding relation, and the obtained picture resource is stored in a project directory in a file form;
and S4, restoring the brightness and the contrast of the picture resource by using an image processing algorithm corresponding to the brightness and the contrast.
Specifically, the step S4 includes:
traversing all the picture resources stored in the project directory, and respectively executing the following steps on each picture resource:
reading picture brightness and contrast numerical values corresponding to the transmitted picture resources according to the data format parameters of the picture resources, and restoring the picture brightness and contrast of the picture resources by using an image processing algorithm corresponding to the picture brightness and contrast numerical values.
Specifically, traversing the picture resource, reading the data format parameter of the transmitted picture resource, obtaining the brightness and contrast values according to the binding relationship between the picture resource and the brightness and contrast thereof, and performing effect restoration on the picture resource by using an image processing algorithm corresponding to the brightness and contrast values;
traversing all pixels of the picture resource, and respectively executing for each pixel:
and obtaining the color value of the pixel, and reassigning the color value of the pixel according to the color value of the pixel and the picture brightness and contrast numerical value corresponding to the picture resource.
Specifically, traversing all pixels of the picture resource, obtaining a color value of each pixel, assigning the read contrast value and the read brightness value corresponding to the picture resource to a contrast and a luminance respectively, and processing the color value of the pixel according to the size of the contrast under the following three conditions:
when contract =1, if value >127.5, value =255, otherwise value =0;
when constast > =1, alpha = 1-constast, alpha = 1/alpha-1, value = value + (value-127.5 f + luminance 127.5 f) × alpha + luminance 255, where alpha is a transparency value of a pixel, taken together with a color value of the pixel, and f denotes a floating point number;
when constast <1, value = value + (value-127.5 f + luminance 127.5 f). Constast + luminance 255, f denotes a floating point number;
the value obtained by the solving is the color value of the pixel after being restored, wherein the value needs to be limited within the range of [0,255 ].
Example two
Referring to fig. 2, a terminal 1 for restoring picture brightness and contrast includes a memory 2, a processor 3, and a computer program stored in the memory 2 and executable on the processor 3, where the processor 3 implements the steps in the first embodiment when executing the computer program.
In summary, the present invention provides a method and a terminal for restoring brightness and contrast of a picture, wherein a pplx file is decompressed and read by zlib and RAPIDxml tools, and readability of an XML file is utilized to enable a user to visually acquire attributes and characteristics of each element in the PPTX file, traverse all picture nodes under the XML file representing contents of a PPT page, determine whether the picture is processed by an album, and then acquire brightness and contrast corresponding to the picture and a unique identifier of the picture, thereby improving efficiency of retrieving effective information of the picture, avoiding time and resource waste caused by analyzing the picture which is not processed by the album, storing the acquired unique identifier of the picture and brightness and contrast corresponding to the unique identifier of the picture in a data format of JSON, facilitating data transmission, the key value pair structure form can more intuitively show the corresponding relation between data, the unique identification of the picture is used for matching the corresponding picture resource, the reliability of the result is ensured, the picture resource and the corresponding picture brightness and contrast are bound, the brightness and contrast can be directly obtained according to the binding relation when the brightness and contrast effect of the picture resource is reduced, the efficiency of picture effect reduction is improved, the picture resource is traversed, the picture resource is processed according to the brightness and contrast value corresponding to the picture resource by using a corresponding image processing algorithm, so that the picture in the PPTX file can be accurately reduced by effectively analyzing the processed brightness and contrast of the picture without the help of PowerPoint album processing.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (4)
1. A method for restoring brightness and contrast of a picture, comprising the steps of:
s1, reading an XML file under a PPTX file;
s2, traversing the XML file, and determining the picture processed by the album;
s3, acquiring the brightness, contrast and picture resources of the processed picture according to the picture processed by the album:
s31, traversing child nodes under the picture nodes, and storing the picture brightness and contrast numerical values and the unique identifications of the pictures in an array in a JSON data format in a one-to-one correspondence manner;
s32, traversing all the unique identifiers stored in the array, and respectively executing the following steps for each unique identifier:
s321, matching a relative path of the corresponding picture resource in the page resource association file according to the unique identifier, and acquiring the picture resource by using the relative path;
s322, binding the acquired picture resources with the corresponding picture brightness and contrast values, and storing the picture resources in a project directory in a file form;
s4, restoring the brightness and the contrast of the picture resource by using an image processing algorithm corresponding to the brightness and the contrast;
the step S4 includes:
traversing all the picture resources stored in the project directory, and respectively executing the following steps on each picture resource:
reading picture brightness and contrast numerical values corresponding to the transferred picture resources according to the data format parameters of the picture resources, and restoring the picture brightness and contrast of the picture resources by using an image processing algorithm corresponding to the picture brightness and contrast numerical values;
the using of the image processing algorithm corresponding to the picture brightness and contrast values to perform picture brightness and contrast restoration on the picture resources comprises:
traversing all pixels of the picture resource, and respectively executing for each pixel: and obtaining the color value of the pixel, and reassigning the color value of the pixel according to the color value of the pixel and the picture brightness and contrast numerical value corresponding to the picture resource.
2. The method of claim 1, wherein the step S2 comprises:
acquiring all PPT page numbers in the XML file, traversing picture nodes in the PPT page numbers, judging whether a node related to album processing exists under the picture nodes, if so, executing the step S3, and if not, not processing.
3. A terminal for restoring brightness and contrast of a picture, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program:
s1, reading an XML file under a PPTX file;
s2, traversing the XML file, and determining the picture processed by the album;
s3, acquiring the brightness, contrast and picture resources of the processed picture according to the picture processed by the album:
s31, traversing child nodes under the picture nodes, and storing the picture brightness and contrast numerical values and the unique identifications of the pictures in an array in a JSON data format in a one-to-one correspondence manner;
s32, traversing all the unique identifiers stored in the array, and respectively executing the following steps to each unique identifier:
s321, matching a relative path of the corresponding picture resource in the page resource association file according to the unique identifier, and acquiring the picture resource by using the relative path;
s322, binding the acquired picture resources with the corresponding picture brightness and contrast values, and storing the picture resources in a project directory in a file form;
s4, restoring the brightness and the contrast of the picture resource by using an image processing algorithm corresponding to the brightness and the contrast;
the step S4 includes:
traversing all the picture resources stored in the project directory, and respectively executing the following steps on each picture resource:
reading picture brightness and contrast numerical values corresponding to the transferred picture resources according to the data format parameters of the picture resources, and restoring the picture brightness and contrast of the picture resources by using an image processing algorithm corresponding to the picture brightness and contrast numerical values;
the using of the image processing algorithm corresponding to the picture brightness and contrast values to perform picture brightness and contrast restoration on the picture resources comprises:
traversing all pixels of the picture resource, and respectively executing for each pixel: and obtaining the color value of the pixel, and reassigning the color value of the pixel according to the color value of the pixel and the picture brightness and contrast numerical value corresponding to the picture resource.
4. A terminal for restoring brightness and contrast of a picture according to claim 3, wherein said step S2 comprises:
acquiring all PPT page numbers in the XML file, traversing picture nodes in the PPT page numbers, judging whether a node related to album processing exists under the picture nodes, if so, executing the step S3, and if not, not processing.
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