CN113628292B - Method and device for previewing pictures in target terminal - Google Patents
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Abstract
The application aims to provide a method and equipment for previewing pictures in a target terminal, wherein the method and equipment are used for obtaining an image to be processed, compressing the image to be processed to obtain a compressed image; performing color approximation processing on the compressed image to obtain a compressed image after the color approximation processing; and converting the compressed image after the color approximation processing into an object code based on a preset code format, and inputting the object code into the object terminal to finish the preview display of the image to be processed. Thereby directly previewing the picture using the ssh remote terminal.
Description
Technical Field
The present disclosure relates to the field of computers, and in particular, to a method and apparatus for previewing a picture in a target terminal.
Background
In the prior art, the user needs to view the picture in the process of using the ssh remote terminal, the picture cannot be directly previewed in the ssh terminal by downloading the picture to the user through ftp or other third-party tools, system resources are wasted, and the operation efficiency of the user is further reduced.
Disclosure of Invention
An object of the present application is to provide a method and an apparatus for previewing a picture in a target terminal, which solve the problem in the prior art that the preview operation cannot be directly performed on the picture in an ssh terminal.
According to one aspect of the present application, there is provided a method for previewing a picture in a target terminal, the method comprising:
acquiring an image to be processed, and compressing the image to be processed to obtain a compressed image;
performing color approximation processing on the compressed image to obtain a compressed image after the color approximation processing;
and converting the compressed image after the color approximation processing into an object code based on a preset code format, and inputting the object code into the object terminal to finish the preview display of the image to be processed.
Optionally, the target terminal comprises a ssh terminal or a remote device supporting presentation of 256 color images.
Optionally, the performing color approximation processing on the compressed image includes:
acquiring the color of each pixel of the compressed image, judging whether the color of a single pixel has a history approximation result, and if so, performing color approximation processing on the compressed image based on the history approximation result in the target terminal;
if not, performing color approximation processing on the compressed image based on the color parameters set in the target terminal.
Optionally, the performing color approximation processing on the compressed image based on the color parameters set in the target terminal includes:
determining an RGB value corresponding to a color of each pixel in the compressed image;
and performing color approximation processing on the color of each pixel based on the RGB values and the color parameters set in the target terminal.
Optionally, the color parameters set in the target terminal include color parameters corresponding to a plurality of preset colors, and performing color approximation processing on the color of each pixel based on the RGB values and the color parameters set in the target terminal includes:
calculating all differences between RGB values corresponding to the colors of each pixel and color parameters corresponding to all preset colors, and determining the preset color with the smallest difference as an approximate color;
the color of each pixel is updated using the approximate color to complete color approximation processing.
Optionally, the method further includes:
the color of each pixel in the compressed image and the corresponding approximate color pair are stored as historical approximate processing results.
Optionally, the preset code format includes xterm code, and the converting the compressed image after the color approximation processing into the target code based on the preset code format includes:
determining an RGB value of an approximate color for each pixel in the color-approximated compressed image;
the RGB values based on the approximate color of each pixel are converted into xterm codes.
According to another aspect of the present application, there is also provided an apparatus for previewing a picture in a target terminal, the apparatus comprising:
the image compression module is used for acquiring an image to be processed, and carrying out compression processing on the image to be processed to obtain a compressed image;
the data processing module is used for performing color approximation processing on the compressed image based on the color parameters set in the target terminal to obtain a compressed image after the color approximation processing;
and the image preview module is used for converting the compressed image after the color approximation processing into a target code based on a preset code format, and inputting the target code into a target terminal to finish the preview display of the image to be processed.
Optionally, the apparatus further comprises:
and the storage module is used for storing the color of each pixel in the compressed image and the corresponding approximate color pair as a history approximate processing result.
According to yet another aspect of the present application, there is also provided a computer readable medium having stored thereon computer readable instructions executable by a processor to implement a method as claimed in any one of the preceding claims.
According to still another aspect of the present application, there is also provided an apparatus for previewing a picture in a target terminal, wherein the apparatus includes:
one or more processors; and
a memory storing computer readable instructions that, when executed, cause the processor to perform the operations of the method of any of the preceding claims.
Compared with the prior art, the method and the device have the advantages that the image to be processed is obtained, and compressed processing is carried out on the image to be processed, so that a compressed image is obtained; performing color approximation processing on the compressed image to obtain a compressed image after the color approximation processing; and converting the compressed image after the color approximation processing into an object code based on a preset code format, and inputting the object code into the object terminal to finish the preview display of the image to be processed. Thereby directly previewing the picture using the ssh remote terminal.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
fig. 1 is a flow chart of a method for previewing pictures in a target terminal according to an aspect of the present application;
FIG. 2 is a flow chart illustrating a method for previewing pictures in a target terminal according to an alternative embodiment of the present application;
fig. 3 illustrates a schematic frame structure of an apparatus for previewing pictures in a target terminal according to another aspect of the present application.
The same or similar reference numbers in the drawings refer to the same or similar parts.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings.
In one typical configuration of the present application, the terminal, the device of the service network, and the trusted party each include one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer readable media, as defined herein, does not include non-transitory computer readable media (transmission media), such as modulated data signals and carrier waves.
Fig. 1 is a flow chart of a method for previewing pictures in a target terminal according to an aspect of the present application, where the method includes: S100-S300, wherein in S100, an image to be processed is obtained, and compression processing is carried out on the image to be processed to obtain a compressed image; in S200, performing color approximation processing on the compressed image to obtain a compressed image after the color approximation processing; in S300, the compressed image after the color approximation processing is converted into an object code based on a preset code format, and the object code is input to the object terminal, so as to finish the preview display of the image to be processed. Thereby directly previewing the picture using the ssh remote terminal. It should be noted that, the numbers in the above steps do not represent the execution order.
Specifically, in S100, an image to be processed is acquired, and compression processing is performed on the image to be processed, so as to obtain a compressed image. The user can acquire the image to be processed in the upper computer and perform image compression processing, the image compression processing is lossy compression, and the image to be processed is compressed to obtain the thumbnail of the image to be processed, so that the subsequent processing of the image to be processed is completed efficiently, and system resources are saved. It should be noted that the computer language used in the present application may be Python.
In S200, color approximation processing is performed on the compressed image, and a compressed image after the color approximation processing is obtained. Here, the color approximation processing is performed on the color of each pixel in the compressed image, for example, the number of color categories in the host computer is 1600 tens of thousands, while in the ssh remote terminal, for example, xterm, only 256 color categories can be displayed, so that the color approximation processing is required to be performed on the color of each pixel in the compressed image, for example, the approximate color corresponding to the color category in the compressed image in 256 colors is determined by using a weight calculation method, and all the color categories in the ssh remote terminal are traversed to complete the color approximation processing of the pixel color of the single compressed image, so that the preview image can be displayed more accurately in the ssh remote terminal.
In S300, the compressed image after the color approximation processing is converted into an object code based on a preset code format, and the object code is input to the object terminal, so as to finish the preview display of the image to be processed. The preset code format can be a code format which can be directly read by the target terminal, for example, when the target terminal is an ssh terminal, the xterm code is used as the preset code format, and parameter information corresponding to each pixel in the compressed image after the color approximation processing is converted into the target code of the preset code format one by one, so that the target terminal can directly read the target code, the image to be processed after the color approximation processing can be directly displayed after the target terminal directly reads the target code, the remote downloading of the original image is avoided, and the time and the system resource are saved.
In an alternative embodiment of the present application, the target terminal comprises a ssh terminal or a remote device supporting the presentation of 256 color images. The target terminal may here be an xterm terminal or a preview picture in a ssh remote terminal supporting an emulated xterm terminal, for example a securecrt.
In an optional embodiment of the present application, in S200, the color of each pixel of the compressed image is obtained, and whether the color of a single pixel has a history approximation result is determined, if yes, the color approximation process is performed on the compressed image based on the history approximation result in the target terminal; if not, performing color approximation processing on the compressed image based on the color parameters set in the target terminal. The color of each pixel in the compressed image and the corresponding color parameters are obtained, the color parameters are used for carrying out matching processing in the history approximation processing result, whether the color of the single pixel has the history approximation processing result or not is judged, if yes, the approximation color corresponding to the color of the single pixel in the history approximation processing result is directly called to update the color of the single pixel, system resources can be further saved, and the efficiency of the color approximation processing is improved. If not, performing color approximation processing on the compressed image based on the color parameters set in the target terminal, for example, when the color types set in the target terminal are 256, invoking the relevant parameters of the 256 colors, and performing color approximation processing on the compressed image based on the relevant parameters of the 256 colors so as to display the preview image in the ssh remote terminal more accurately.
In an optional embodiment of the present application, in S200, an RGB value corresponding to a color of each pixel in the compressed image is determined; and performing color approximation processing on the color of each pixel based on the RGB values and the color parameters set in the target terminal. Here, an RGB value corresponding to each pixel color in the compressed image is determined, wherein the RGB value is a composite parameter set of values of a red channel (R channel), a green channel (G channel), and a blue channel (B channel), the RGB value corresponding to each pixel color in the compressed image is determined, and then, the RGB value of the color of a single pixel may be compared with corresponding parameters of all colors in a target terminal to determine an approximate color closest to the color of the single pixel, and the color of the single pixel may be updated using the approximate color to complete a color approximation process.
In an optional embodiment of the present application, in S200, the color parameters set in the target terminal include color parameters corresponding to a plurality of preset colors, all differences between RGB values corresponding to the colors of each pixel and the color parameters corresponding to all preset colors are calculated, and the preset color with the smallest difference is determined as an approximate color; the color of each pixel is updated using the approximate color to complete color approximation processing. Here, the color parameters set in the target terminal include color parameters corresponding to a plurality of preset colors, for example, RGB values corresponding to 256 colors, calculating a difference between the RGB value corresponding to the color of the single pixel and the RGB value corresponding to all preset types of colors, and taking the preset type of color with the smallest difference as the approximate color to update the color of the single pixel.
In an alternative embodiment of the present application, the color of each pixel in the compressed image and the corresponding approximation color pair are stored as historical approximation processing results. Here, the numerical value of the color of each pixel in the compressed image and the corresponding approximate color related parameter are stored in pairs as the history approximation result, and can be stored in a cache, so that the history approximation result is quickly matched and called to complete the color approximation process.
In an optional embodiment of the present application, in S300, the preset code format includes xterm code, and an RGB value of an approximate color of each pixel in the compressed image after the color approximation process is determined; the RGB values based on the approximate color of each pixel are converted into xterm codes. Here, a preset code format, such as xterm code, is determined based on a code format that can be directly read by the target terminal, and RGB values of each pixel approximation color in the compressed image after all color approximation processing are converted into xterm code one by one, for example, RGB values (255, 0) are converted into \e [38;5, a step of; 9/u 2593m. And after the ssh terminal is used for acquiring codes from the upper computer, the codes are directly read and displayed as red square shadows.
Fig. 2 is a flow chart of a method for previewing pictures in a target terminal according to an alternative embodiment of the present application, where an application environment of the embodiment is to use an ssh terminal to preview pictures in a host computer. Firstly, an upper computer is used for obtaining an image to be processed, and the image to be processed is subjected to image compression processing, for example, a square is used for replacing pixel points. The pixel point is a single pixel, which is the smallest color unit on the computer, and each pixel has only one color. For example, a picture is 400 x 600 in size, and then it consists of 400 x 600 pixels. Each pixel is replaced by a square shadow. Under unicode encoding, there are special characters, such as a square shadow, whose unicode encoding is_2593. The square is text, but can be used as a pixel point, using square shading instead of pixels.
Then, all pixels are traversed one by one, color approximation processing is performed on the colors of all pixels according to the RGB value of each pixel, and 1600 tens of thousands of colors are approximated to 256 colors in the xterm terminal. The bit depth of each pixel of a normal picture, i.e. the color class is 256 x 256, about 1600 tens of thousands. The xterm terminal can support 256 colors, although the number of the xterm terminals is huge, because the resolution of human eyes is limited, if the actual pixel colors are converted into the most approximate xterm colors, the human eyes are combined with the actual application, so that a user can resolve the compressed image after the color approximation processing. Here, in the process of performing the color approximation process, RGB values of 256 colors provided by xterm are acquired. Calculating three-channel difference sum of the RGB value of the color of the single pixel and the RGB value of each color of 256 colors as a total difference value in the color approximation calculation, taking the total difference value as a weight, and taking the color corresponding to the minimum weight as an approximation color. If the actual color is (93,136,255), the (95,135,255) in xterm can be taken as the approximate color, the weight is minimum, and the weight calculation process is (|93-95|+|136-135|+|255-255|) =3. For colors with uncomputed weights, all 256 colors are traversed, and the approximate colors with the smallest weights are found and then stored in a cache as a history approximate processing result in pairs. The approximate color is obtained directly from the buffer for the color that has been calculated. In the color matching of the toB side, the color is usually single and is easy to distinguish after approximation.
And finally, converting each approximate color into xterm codes, and outputting the xterm codes to the ssh terminal, so that the preview pictures can be directly read and displayed. Therefore, the ssh remote terminal is directly used for previewing the picture, and editing operation can be carried out on the picture.
Embodiments of the present application also provide a computer readable medium having stored thereon computer readable instructions executable by a processor to implement a method of previewing pictures in a target terminal as described above.
Corresponding to the above-described method, the present application further provides a terminal, which includes modules or units capable of performing the steps of the method described in fig. 1 or fig. 2 or the respective embodiments, where the modules or units may be implemented by hardware, software or a combination of hardware and software, and the present application is not limited thereto. For example, in an embodiment of the present application, there is also provided an apparatus for previewing a picture in a target terminal, where the apparatus includes:
one or more processors; and
a memory storing computer readable instructions that, when executed, cause the processor to perform the operations of one of the aforementioned methods of previewing pictures in a target terminal.
For example, computer-readable instructions, when executed, cause the one or more processors to:
acquiring an image to be processed, and compressing the image to be processed to obtain a compressed image; performing color approximation processing on the compressed image to obtain a compressed image after the color approximation processing; and converting the compressed image after the color approximation processing into an object code based on a preset code format, and inputting the object code into the object terminal to finish the preview display of the image to be processed.
Fig. 3 shows a schematic diagram of a device framework for previewing pictures in a target terminal according to another aspect of the present application, where the device includes: the image compression module 100 is configured to obtain an image to be processed, and compress the image to be processed to obtain a compressed image; the data processing module 200 is configured to perform color approximation processing on the compressed image based on color parameters set in the target terminal, so as to obtain a compressed image after the color approximation processing; the image preview module 300 is configured to convert the compressed image after the color approximation processing into a target code based on a preset code format, and input the target code into a target terminal to complete the preview display of the image to be processed. Thereby directly previewing the picture using the ssh remote terminal.
It should be noted that, the contents executed by the image compression module 100, the data processing module 200, and the image preview module 300 are the same as or corresponding to the contents in the steps S100, S200, and S300, and are not described herein for brevity.
In an alternative embodiment of the present application, the apparatus further includes a storage module 400 for storing the color of each pixel in the compressed image and the corresponding approximation color pair as a historical approximation processing result. Here, the storage module 400 stores the value of the color of each pixel in the compressed image and the corresponding approximate color related parameter in pairs as the history approximation result, and may be stored in the cache of the storage module 400, so as to quickly match and call the history approximation result to complete the color approximation process.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
It should be noted that the present application may be implemented in software and/or a combination of software and hardware, for example, using Application Specific Integrated Circuits (ASIC), a general purpose computer or any other similar hardware device. In one embodiment, the software programs of the present application may be executed by a processor to implement the steps or functions as described above. Likewise, the software programs of the present application (including associated data structures) may be stored on a computer readable recording medium, such as RAM memory, magnetic or optical drive or diskette and the like. In addition, some steps or functions of the present application may be implemented in hardware, for example, as circuitry that cooperates with the processor to perform various steps or functions.
Furthermore, portions of the present application may be implemented as a computer program product, such as computer program instructions, which when executed by a computer, may invoke or provide methods and/or techniques in accordance with the present application by way of operation of the computer. Program instructions for invoking the methods of the present application may be stored in fixed or removable recording media and/or transmitted via a data stream in a broadcast or other signal bearing medium and/or stored within a working memory of a computer device operating according to the program instructions. An embodiment according to the present application comprises an apparatus comprising a memory for storing computer program instructions and a processor for executing the program instructions, wherein the computer program instructions, when executed by the processor, trigger the apparatus to operate a method and/or a solution according to the embodiments of the present application as described above.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is evident that the word "comprising" does not exclude other elements or steps, and that the singular does not exclude a plurality. A plurality of units or means recited in the apparatus claims can also be implemented by means of one unit or means in software or hardware. The terms first, second, etc. are used to denote a name, but not any particular order.
Claims (9)
1. A method of previewing a picture in a target terminal, wherein the method comprises:
acquiring an image to be processed, and compressing the image to be processed to obtain a compressed image;
performing color approximation processing on the compressed image to obtain a compressed image after the color approximation processing;
converting the compressed image after the color approximation processing into an object code based on a preset code format, inputting the object code into a target terminal, and completing preview display of the image to be processed, wherein the preset code format comprises xterm codes, and the target terminal comprises an ssh terminal or remote equipment supporting display of 256-color images;
the method for converting the compressed image after the color approximation processing into an object code based on a preset code format comprises the following steps:
determining an RGB value of an approximate color for each pixel in the color-approximated compressed image;
the RGB values based on the approximate color of each pixel are converted into xterm codes.
2. The method of claim 1, wherein said color approximation processing of said compressed image comprises:
acquiring the color of each pixel of the compressed image, judging whether the color of a single pixel has a history approximation result, and if so, performing color approximation processing on the compressed image based on the history approximation result in the target terminal;
if not, performing color approximation processing on the compressed image based on the color parameters set in the target terminal.
3. The method of claim 2, wherein the performing color approximation processing on the compressed image based on the color parameters set in the target terminal comprises:
determining an RGB value corresponding to a color of each pixel in the compressed image;
and performing color approximation processing on the color of each pixel based on the RGB values and the color parameters set in the target terminal.
4. The method of claim 3, wherein the color parameters set in the target terminal include color parameters corresponding to a plurality of preset colors, and the performing color approximation processing on the color of each pixel based on the RGB values and the color parameters set in the target terminal includes:
calculating all differences between RGB values corresponding to the colors of each pixel and color parameters corresponding to all preset colors, and determining the preset color with the smallest difference as an approximate color;
the color of each pixel is updated using the approximate color to complete color approximation processing.
5. The method of claim 4, wherein the method further comprises:
the color of each pixel in the compressed image and the corresponding approximate color pair are stored as historical approximate processing results.
6. An apparatus for previewing a picture in a target terminal, wherein the apparatus comprises:
the image compression module is used for acquiring an image to be processed, and carrying out compression processing on the image to be processed to obtain a compressed image;
the data processing module is used for performing color approximation processing on the compressed image based on color parameters set in a target terminal to obtain a compressed image after the color approximation processing, wherein the target terminal comprises a ssh terminal or remote equipment supporting display of 256-color images;
the image preview module is used for converting the compressed image after the color approximation processing into a target code based on a preset code format, and inputting the target code into a target terminal to finish the preview display of the image to be processed, wherein the preset code format comprises xterm codes;
wherein, the image preview module is used for:
determining an RGB value of an approximate color for each pixel in the color-approximated compressed image;
the RGB values based on the approximate color of each pixel are converted into xterm codes.
7. The apparatus of claim 6, wherein the apparatus further comprises:
and the storage module is used for storing the color of each pixel in the compressed image and the corresponding approximate color pair as a history approximate processing result.
8. A computer readable medium having stored thereon computer readable instructions executable by a processor to implement the method of any of claims 1 to 5.
9. An apparatus for previewing a picture in a target terminal, wherein the apparatus comprises:
one or more processors; and
a memory storing computer readable instructions that, when executed, cause the processor to perform the operations of the method of any one of claims 1 to 5.
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