CN105491398B - Image processing method, picture processing unit and picture processing platform - Google Patents
Image processing method, picture processing unit and picture processing platform Download PDFInfo
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Abstract
The present invention provides a kind of image processing method, obtain the attribute information of original image, original image is JPG picture, when the area of original image is not less than area threshold, it is converted into PNG and compresses, original image is also compressed, then the volume deviation of the two width pictures compared, when deviation is small and the color value of original image is greater than threshold value, select the compressed picture of former original image, otherwise the compressed picture of PNG format is selected, picture processing is carried out according to the attribute information of picture in the program, according to picture area, picture volume, the multifrequency natures such as color value are targetedly handled, reduce the volume of picture, it ensure that the quality of picture simultaneously, it is particularly suitable for the upload of picture, it shares during waiting, suitable picture format is provided for user, avoid as picture format it is inappropriate caused by picture The problems such as volume is excessive, bandwidth waste, poor image quality.
Description
Technical field
The present invention relates to picture process field, specifically a kind of image processing method and picture processing unit and figure
Piece processing platform.
Background technique
With the development of the network information technology and electronic information technology and universal, electricity is commonly used in people in daily life
Sub-pictures, such as mobile phone, digital camera all have the function of taking pictures, and the shared of many image informations becomes simple and convenient.In mesh
In preceding many network platforms, all have the function of that picture is shared, such as upload head portrait, photograph album.User is using a figure
When piece, it is often desired to which picture quality is good, small in size.But for a kind of picture of fixed format, in general picture
Quality and volume be it is directly proportional, to obtain higher picture quality, which is necessarily required to meet certain size, therefore needs
A tradeoff is done between picture image quality and volume size.
Such as in the network platform, when user selects uploading pictures, user pulls or clicks the figure for uploading a PNG32 format
Piece, system carry out lossy compression according to the actual conditions of picture, and image size needed for making it meet the platform completes compression
After return to new picture to user, downloading may be selected in user.Further, it is also possible to pair before and after being compressed to the picture of user's offer
Than if user uploads the picture of jpeg format, carrying out a degree of lossy compression according to the quality of picture and size, keeping it full
The requirement of pedal system platform, the new picture obtained after then compressing original image return to user, and show new picture and original
The comparison of figure, user can choose downloading.In these schemes, picture upload format, be all by the format of original image Lai
It determines, when the format of original image is not supported in the system platform, then can not upload.
To solve the above-mentioned problems, a kind of side of uploading pictures is disclosed in Chinese patent literature CN101808182A
Transmission terminal and system in method, picture, the method for the uploading pictures include obtaining the picture letter for needing to be uploaded to picture sharing Web sites
Breath judges the requirement to uploading pictures for needing the picture uploaded whether to meet picture sharing Web sites according to the information, is judged as
When being, picture is uploaded to picture sharing Web sites, when being judged as NO, is carried out picture accordingly according to the requirement of picture sharing Web sites
Conversion, then the picture after being converted is uploaded to picture sharing Web sites.In the program, user passes through blit in terminal such as PC machine
When piece to picture sharing Web sites, the format for the uploading pictures that picture sharing Web sites are not supported can be converted into picture automatically and is total to by terminal
It is uploaded to picture sharing Web sites again after enjoying the format of website support, picture thus may be implemented and upload automatically.But due to mesh
The format for the uploading pictures that preceding picture sharing Web sites are supported is more and more diversified, and different its features of picture format is again different, should
Scheme can not select optimal picture format in numerous picture formats, can not also optimize for different format pictures
Processing.
Summary of the invention
For this purpose, technical problem to be solved by the present invention lies in can only carry out turning for format when the upload of picture in the prior art
Change the compression with data, processing can not be targetedly optimized for the picture of different-format, to propose a kind of picture
Processing method and the picture processing unit for using this method, and a kind of picture processing using the picture processing unit is provided simultaneously
Platform.
A kind of image processing method is provided in order to solve the above technical problems, of the invention, including
The attribute information of original image is obtained, the original image is JPG format picture, the attribute information packet of the picture
Include picture area and picture color value；
Judge whether the area of original image is less than area threshold, when be not less than area threshold when, then by original image into
Row compression obtains the first format picture, and converts original image to after PNG format and compressed to obtain the second format picture, counts
The volume deviation of the first format picture and the second format picture is calculated, if the volume deviation is less than deviation threshold and original image
Color value is greater than color threshold, selects the first format picture, otherwise selects the body in the first format picture and the second format picture
The small picture of product.
The present invention also provides a kind of picture processing units, comprising: extraction module: obtaining the attribute information of original image, institute
Stating original image is JPG format picture, and the attribute information of the picture includes picture area and picture color value；
Judgment module: judging whether the area of original image is less than area threshold, if not, original image is compressed
The first format picture is obtained, and converts original image to after PNG format and is compressed to obtain the second format picture, calculates first
The volume deviation of format picture and the second format picture, if the volume deviation is less than the color value of deviation threshold and original image
Greater than color threshold, the first format picture is selected, is otherwise selected small in size in the first format picture and the second format picture
Picture.
In addition, the present invention also provides a kind of picture processing platform, including picture processing unit and storage equipment, the picture
Processing unit is for handling picture, the server treated for storing picture processing unit picture.
The above technical solution of the present invention has the following advantages over the prior art,
(1) present invention provides a kind of image processing method, obtains the attribute information of original image, and original image is JPG figure
Piece is converted into PNG and compresses, original image is also compressed, then when the area of original image is not less than area threshold
The volume deviation of the two width pictures compared when deviation is small and the color value of original image is greater than threshold value, selects former original graph
Otherwise the compressed picture of piece selects the compressed picture of PNG format, carry out picture according to the attribute information of picture in the program
Processing, is targetedly handled according to multifrequency natures such as picture area, picture volume, color values, reduces the volume of picture,
Ensure that the quality of picture simultaneously, be particularly suitable for picture upload, it is shared etc. during, provide the suitable of optimization for user
Picture format, avoid as picture format it is inappropriate caused by picture volume is excessive, bandwidth waste, poor image quality the problems such as.
(2) the present invention also provides a kind of picture processing units, including extraction module and judgment module, and JPG figure may be implemented
The processing of piece, the original image provided for user optimize processing, obtain in conjunction with the contents attribute and format characteristic of picture
Preferred format and the form of expression are obtained, the expression way of picture is optimized.
(3) the present invention also provides a kind of picture processing platforms using above-mentioned picture processing unit, including picture processing dress
Equipment is set and is stored, after picture to be treated is carried out above-mentioned processing via picture processing unit, is stored in storage equipment,
It is effectively utilized the attribute of picture itself, improves the shared quality and uploading speed of picture.
Detailed description of the invention
In order to make the content of the present invention more clearly understood, it below according to specific embodiments of the present invention and combines
Attached drawing, the present invention is described in further detail, wherein
Fig. 1 is the hardware environment schematic diagram that image processing method is run in embodiment of the present invention；
Fig. 2 is another hardware environment schematic diagram that image processing method is run in embodiment of the present invention；
Fig. 3 is another hardware environment schematic diagram that image processing method is run in embodiment of the present invention
Fig. 4 is the flow chart of the image processing method of the embodiment of the present invention 1；
Fig. 5 is the flow chart of the image processing method of the embodiment of the present invention 2；
Fig. 6 is the flow chart of the image processing method of the embodiment of the present invention 3；
Fig. 7 is the flow chart of the image processing method of the embodiment of the present invention 4；
Fig. 8 is the structure chart of the picture processing unit of the embodiment of the present invention 6；
Fig. 9 is the structure chart of the picture processing unit of the embodiment of the present invention 7.
Specific embodiment
In a particular embodiment, the plurality of picture processing method under present inventive concept is provided.Design structure of the invention
Think to be handled according to the attribute information of picture picture, using the format information combination transparent characteristic of picture, picture area,
The multifrequency natures such as picture volume, color value are targetedly handled, and while reducing picture volume, guarantee the matter of picture
Amount.Since different image content is different, than if any picture color it is abundant, some picture colors are single, and some pictures contain
Transparent part etc., different pictures have different characteristics, and also different the characteristics of various picture formats, some picture format colors
Coloured silk is abundant, and some picture format data volumes are small, and the present invention is exactly that these characteristics are utilized, by the actual attribute of picture and various figures
The characteristic of piece format combines, and is handled, thus guarantee picture effect while reducing picture volume to the greatest extent, it is especially suitable
In picture upload, it is shared etc. during, provide suitable picture for user, avoid as picture format it is inappropriate caused by figure
The problems such as piece volume is excessive, bandwidth waste, poor picture quality.
In this embodiment, the method application environment of picture processing can be that computer, mobile phone etc. can be to figures
In the terminal device that piece is handled, as shown in Figure 1 and Figure 2, in such devices, user can select picture and carry out at picture
Reason, picture stores in such devices after processing.The application environment of the image processing method may be website or some applications
The server of program, as user can pass through the client of mobile phone or computer Website login or these application programs, user
After selected picture, the picture upload onto the server in handled, as shown in figure 3, being handled simultaneously by server the picture completion
Storage.
Embodiment 1:
A kind of JPG image processing method is provided in the present embodiment, the equipment for executing this method is computer, in the computer
It is inside provided with and performs the following operations corresponding program instruction, the process which carries out picture processing is as shown in Figure 4.
User provides the original image of a JPG format.Jpeg format picture, also referred to as JPG format picture, are most common
A kind of picture format, stop after file entitled " .GIF " or " .jpeg ", is organized to set up by a software development federation, is one
Kind lossy compression format, JPEG compression technology is highly advanced, it removes the image data of redundancy with lossy compression mode, is obtaining
The lively image of very abundant can be showed while high compression ratio, preferable image can be obtained with least disk space
Quality.
The picture treatment process of the JPG format provided in the present embodiment for user is as follows, as shown in Figure 4:
Firstly, computer obtains the attribute information of original image, the attribute information of the picture includes picture area and figure
Piece color value.Picture area refers to the length and wide product of picture.Picture color value refers to all pixels point for including in picture
In possessed all colours quantity.General each pixel is indicated by one group of numerical value, is traversed in the picture
All pixels point, this group of numerical value is identical, then it represents that identical color is classified as a kind of color；If it is different, then table
Show different colors, color value increases one kind, has thus obtained all color values of the picture.
Then, computer judges whether the area of original image is less than area threshold, and area threshold is in the present embodiment
100*100 pixel is then compressed original image to obtain JPG format picture 1, and will be former when being greater than the area threshold
Beginning picture is compressed to obtain PNG format image 2 after being converted into PNG format, then calculates the volume and PNG of JPG format picture 1
The volume of format picture 2.The volume of picture refers to the size of the occupied memory space of picture, if the size of picture is 1k, 1M
Deng, picture volume size by its area, pixel number etc. many factors are comprehensive determines.Obtain the body of JPG format picture 1
After long-pending and PNG format image 2 volume, then the difference of the two volumes is calculated, as volume deviation, volume deviation is actually
With regard to the difference of the volume of two width pictures.If the volume deviation is less than 40K and the color value of original image is greater than 30000 kinds,
It selects JPG format picture 1 as treated picture, otherwise selects small in size in JPG format picture 1 and PNG format image 2
Picture as treated picture.
Original image is such as compressed to obtain JPG format picture 1, original image is converted by the compression in the above process
To be compressed to obtain PNG format image 2 after PNG format, compression therein is all lossy compression.Lossy compression is according to human eye
Characteristic (time lag etc.), reduce semaphore, signal itself has certain loss, that is, image quality has loss.This
Compression ratio selection 75% in embodiment, in other modes, also can choose 70%-80%.
In above process, it after having obtained JPG format picture 1 and PNG format image 2, is shown due to JPG format
Picture, color is relatively abundanter, if be greater than 30000 kinds in the more such as the present embodiment of color value, can pay the utmost attention to JPG format
Graphic form, but the volume of picture cannot be allowed too big again, therefore in the case that two obtained width picture volumes are not much different
It can preferentially select the picture 1 of JPG format as treated picture.When color value is few, then do not need preferentially to select
The picture of JPG format, but consider to select picture small in size, to reduce the occupied space of picture.When volume difference compares
When big, and consider small in size preferential, therefore is all select picture small in size as treated to scheme in the case of these
Piece.
In other alternative embodiments, the area threshold can choose 500-22500 pixel, color threshold
Value can choose the different color value of 20000-35000 kind, and volume deviation can choose within the scope of 20-50K.
Picture of the computer by above-mentioned processing mode, then after can be processed.The present invention is by the actual attribute of picture
It is combined with the characteristic of JPG picture format, optimizes processing, thus the expression original image information that obtaining can be optimal
Picture format and manifestation mode improve the expression effect of picture, be particularly suitable for picture upload, it is shared etc. during, be
User provides the suitable picture format of optimization, avoid as picture format it is inappropriate caused by picture volume is excessive, bandwidth is unrestrained
Take, poor image quality the problems such as.
Embodiment 2:
Another JPG image processing method is provided in the present embodiment, this method can be executed by mobile phone terminal, be used
Family stores the original image that a format is JPG format in mobile phone, has in the mobile phone and executes following treatment process
Instruction, so that following process flow is completed, as shown in figure 5, the attribute includes figure firstly, mobile phone reads original JPG picture attribute
The pictures build-in attributes such as format information, area, color value, former compression ratio, the volume of piece, then mobile phone judges the face of original image
Product, if it is less than 150*150 pixel, is then converted to PNG8 format for original image by program, as treated picture.
If the area of original image is not less than above-mentioned threshold value 150*150 pixel, mobile phone if, passes through program for original graph
Piece carries out lossy compression and obtains JPG picture 1, and converts PNG24 format for original image and (can also turn in other embodiments
It is changed to PNG32 format) lossy compression is carried out afterwards obtains PNG picture 2, then calculate the inclined of the volume of JPG picture 1 and PNG picture 2
Difference.If the color value of original image is greater than 20000 kinds and the volume deviation of compressed JPG picture 1 and PNG picture 2 is less than
50K then selects JPG picture 1 for the picture after optimization；If the color value of original image is less than or equal to 20000 kinds, or compression
When the volume deviation of JPG picture 1 and PNG picture 2 afterwards is more than or equal to 50K, then select picture small in size as treated
Picture.
A compression such as 70% or 80% can be preset during above-mentioned lossy compression, in mobile phone, according to
The compression ratio carries out lossy compression.In other implementations, a suitable pressure can also be obtained according to current situation
Contracting ratio needs to obtain at this time the former compression ratio of original image first, if the original compression ratio is greater than 75%, using 75% described in
Compression ratio when lossy compression；If the former compression ratio of original image is less than 75%, using the former compression ratio of original image as institute
Compression ratio when stating lossy compression is compressed.
After completion of the above process, as final picture, can also lead to above by the picture after handset processes
It crosses mobile phone to be further processed, such as obtaining that treated, picture is compared with original image, if treated
Picture format is identical as original image format, then direct output treated picture, is stored in the storage card of mobile phone；Such as not phase
Together, then original image is subjected to compression acquisition and the consistent compressed picture of original image format, after the compressed picture and processing
Picture export simultaneously, be stored in the storage card of mobile phone.More selections can be thus provided for user, meet user's
Diversity requirement.
In other preferred implementations, mobile phone can also be original image after having carried out above-mentioned processing to picture
The picture for exporting a WEBP format, is stored in mobile phone card.Due to the picture of the WEBP picture format, some places are obtained
It uses, it is spare to export such width figure herein, also provides more convenience for user.It, can be with during picture output
A plurality of types of pictures are exported as needed for user, user can according to need to select, using more convenient.
Embodiment 3:
A kind of processing method of PNG picture is provided in the present embodiment, the equipment for executing this method is server, in server
In be stored with the instruction code for executing following processes, user provides user in website and selects picture by mobile phone Website login
Interface, when user, which selectes PNG picture, to be uploaded, server obtains the information of the picture, and the picture is handled as follows, stream
Journey figure is as shown in Figure 6:
Firstly, server determines the attribute information for the PNG picture that user selectes, the attribute information include transparent characteristic,
Area, color value.
PNG format image, i.e., portable network graphic (PNG, Portable Network Graphics), is a kind of figure
As file format.PNG is capable of providing the lossless compression image file of length ratio GIF small 30%.PNG format has 8,24,32
The three kinds of forms in position, wherein 8 PNG support two different transparent forms (index is transparent and alpha is transparent), 24 PNG are not propped up
Hold transparent, 32 PNG increase 8 transparent channels on the basis of 24, therefore can show 256 grades of transparencies.PNG8 and
The subsequent number of PNG24 is then the color value for representing this PNG format and at most can indexing and store." 8 " represent 28 powers
Namely 256 colors, and 24 24 powers for representing 2 probably have ten thousand color more than 1600.
The area and color value of picture were introduced in the above-described embodiments, and details are not described herein.The transparent characteristic of picture is
Refer to and whether there is transparent pixel in picture, if there are transparent pixels in picture, then it is assumed that the picture is translucent
Picture, if transparent pixel is not present in the picture, that is, all pixels are all opaque, then it is assumed that the figure
Piece is not translucent picture.Whether pixel is transparent to be indicated by alpha channel (Alpha Channel).
Since the pictorial information for including in PNG picture is more, in order to reduce the volume of picture, server is first to original
PNG picture carries out lossless compression, and getting rid of does not influence the information that picture shows quality.Lossless compression is to close video signal
And arrange, signal itself does not lose.Picture after original image is carried out without compressing, as subsequent processing.
Then, server further judges the transparent characteristic of original image, when transparent pixels point is not present, judges picture
Area or picture color value, if picture area is less than 100*100 pixel or picture color value is less than 30000 kinds different
When color, then PNG8 format picture is converted by the PNG picture after above-mentioned lossless compression；Otherwise, that is, the area of picture not
Less than the color value of 100*100 pixel and picture not less than in the case where 30000 kinds, by the PNG picture after lossless compression into
Row compression obtains a width picture, and the PNG picture after the lossless compression is converted to compressed to obtain again after JPG format it is another
Secondary picture, the then volume of more compressed two width picture select picture small in size after compression as treated picture,
By treated, picture is stored in the server, is provided for user and the functions such as is checked, downloads.
In other alternative embodiments, the threshold value of above-mentioned area is also an option that 500-22500 pixel, such as
150*150 pixel；Above-mentioned color threshold can choose the different color value of 20000-35000 kind, and such as 20000 kinds, 25000 kinds
Or 35000 kinds.
In image processing method provided in this embodiment, the original PNG picture that user selectes is carried out by server
Processing carries out picture processing according to the attribute information of picture in the program, according to the transparent characteristic of picture, color value and area into
Row judgement, realizes and preferably shows original image information with lesser picture volume, improve the property of picture quality and volume
Valence ratio, be particularly suitable for picture upload, it is shared etc. during, provide the suitable picture of optimization for user, avoid due to scheming
The problems such as picture volume caused by piece format is inappropriate is excessive, bandwidth waste.
Embodiment 4:
Another PNG image processing method is provided in the present embodiment, original image format is PNG, processing stream herein
Journey is as shown in Figure 2.The equipment for realizing this method is tablet computer, and user is selected in present in the computer using tablet computer
Picture is stored with the program instruction performed the following operations in the tablet computer, completes to select user by running the instruction
The process that is handled of picture, flow chart is as shown in Figure 7.
After user selectes picture, firstly, tablet computer executes the instruction of PNG picture processing, the figure after obtaining lossless compression
The attribute of piece, the former compression ratio of area, color value, transparent characteristic and picture including picture.The compression ratio of picture refers to logical
The compression ratio of digital imagery size and original image after crossing encoder compresses as Digital size.Then, nothing is carried out to original PNG picture
Damage compression, the picture after obtaining lossless compression.
Then, program therein is called by tablet computer, judges such as to deposit in original image with the presence or absence of transparent pixel
In transparent pixel, then the original image is translucent picture, and if there is no transparent pixel, then the picture is not
Translucent picture.In the process, if there are transparent pixels in original image, the picture after lossless compression is carried out
Lossy compression that compression ratio is 75% is simultaneously converted into the picture with transparent PNG8 format, and 75% compression ratio herein is excellent
The compression ratio of choosing, compression proximate to it such as 70-80% also may be implemented.
When being judged as NO, that is to say, that transparent pixel is not present in original image, then further judges original image
Area or color value, if area is less than 150*150 pixel or picture color value less than 35000 kinds, after lossless compression
Picture be converted into PNG8 format；Otherwise the picture after lossless compression is converted into JPG format, and by the JPG format after conversion
Original PNG format image after picture and lossless compression carries out lossy compression respectively, and compression ratio can be set to 70%, so
After compare compressed picture volume, select the picture of format small in size as treated picture, be stored in tablet computer
In.
After completion of the above process, it can will be deposited above by tablet computer treated picture as final picture
Storage, can also be further processed by tablet computer, and such as obtaining that treated, picture compares with original image
Compared with if treated, picture format is identical as original image format, directly output treated picture, is stored in plate electricity
In the hard disk of brain；If not identical, then original image is subjected to compression acquisition and the consistent compressed picture of original image format, by this
Picture exports compressed picture simultaneously and is stored in tablet computer and selects for user with treated.It can thus be mentioned for user
For more selecting, meet the diversity requirement of user.
In other preferred implementations, tablet computer can also be original after having carried out above-mentioned processing to picture
Picture exports the picture of a WEBP format, and is stored in the hard disk of tablet computer.Due to the picture of the WEBP picture format,
Popularization and use has been obtained, it is spare to export such width figure herein, also provides more convenience for user.It is defeated in picture
During out, it can according to need and export a plurality of types of pictures for user, user can according to need to select, using more
It is convenient.
Embodiment 5:
The processing method of the picture for JPG format is given in above-described embodiment 1 and 2, specifically:
The attribute information of original image is obtained, the original image is JPG format picture, the attribute information packet of the picture
Include picture area and picture color value；Judge whether the area of original image is less than area threshold, when being not less than area threshold,
Then original image is compressed to obtain the first format picture, and converts original image to after PNG format and is compressed to obtain
Second format picture calculates the volume deviation of the first format picture and the second format picture, if the volume deviation is less than deviation
The color value of threshold value and original image is greater than color threshold, selects the first format picture, otherwise selects the first format picture and the
Picture small in size in two format pictures.
The processing method for PNG format image is given in above-described embodiment 3 and 4, method particularly includes:
Firstly, determine the attribute information of original image, wherein the original image is PNG format image, the attribute letter
Breath includes transparent characteristic, area, color value；Then, lossless compression is carried out to original image and obtains intermediate picture；Next, it is determined that
The transparent characteristic of the original image judges the area or color value of original image, if former when transparent pixels point is not present
Beginning picture area is less than area threshold or original image color value is less than color threshold, then converts PNG8 for the intermediate picture
Format picture；Otherwise the intermediate picture is compressed, and is pressed again after the intermediate picture is converted to JPG format
Contracting, the volume of more compressed two width picture, picture small in size after selection compression.
A kind of image processing method is provided in the present embodiment, in conjunction with above two picture processing mode, can be selected automatically
It takes format and is converted, select suitable compression algorithm, the picture that obtains that treated.The hardware environment for realizing this method is clothes
The computer of business device, the server and user connect, and the interface of user's uploading pictures is provided on the computer of user, and server is logical
The picture of interface captures user selection is crossed, and carries out picture processing.For the picture that user uploads, server can be according to picture
Format and other property parameters determine that the picture is to select PNG or JPG format, determine compressed picture body further according to algorithm
Long-pending compression ratio.Process is as follows:
Step 1: user uploads a picture (PNG or JPG format) by the upload interface in computer, and server obtains should
The transparent characteristic of picture, picture format, picture color value, picture area, picture volume, the category of picture original compression ratio etc. picture
Property parameter, then carry out step 2 operation.The meaning of these property parameters by the agency of mistake in the above-described embodiments, herein not
It repeats again.
Step 2: server judges the format of picture, if picture format is PNG, carries out first to original PNG picture lossless
Then compression judges original PNG picture with the presence or absence of transparent pixel (whether being with translucent picture), if so, holding
Row step 3 executes step 4 if not being.If picture is not PNG format and is JPG format, 6 are thened follow the steps.
Step 3: lossy compression is carried out to original PNG picture and is converted into the picture with alpha transparent png8 format simultaneously,
It is preferred value through a large amount of pictures test 75% so selecting 75% compression ratio when lossy compression since original image is PNG.
Step 4: picture is to judge the area of original image, such as original graph at this time there is no the PNG picture of transparent pixels point
The area of piece is less than 100*100 pixel or picture color value is less than 30000 kinds, then by the picture after lossless compression in step 2
Switch to the picture of PNG8 format.If it is not, executing step 5.
Step 5: the PNG picture after lossless compression in step 2 being converted into JPG format, then by the picture of the JPG format
Lossy compression is carried out, and the PNG picture after lossless compression is also subjected to lossy compression, compression ratio is all 75%, then compares compression
Picture volume afterwards exports picture small in size as treated picture, and is stored in the hard disk of server.
Step 6: picture is JPG format, obtains the former compression ratio of picture first, if compression ratio is greater than 75%, after specifying
The compression ratio of continuous lossy compression is 75%, if specifying the compression ratio of subsequent lossy compression is picture original compression ratio less than 75%.If
Picture area is less than 100*100, converts picture into the picture of PNG8 format.If it is not, executing step 7.
Step 7: picture being converted into PNG format, can according to need herein and be converted into PNG24 or PNG32, the present embodiment
In be converted to PNG32 format, by original JPG picture progress lossy compression obtain JPG picture 1, which is carried out
Lossy compression obtains PNG picture 2, the compression ratio that compression ratio is obtained according to step 6.If original image color value is greater than 30000 simultaneously
And the volume deviation of JPG picture 1 and PNG picture 2 is when being less than 50k, then using JPG picture 1 as the picture after preferred；Otherwise,
If picture color value less than 30000 or when the volume deviation of JPG picture 1 and PNG picture 2 is greater than or equal to 50k, compares two kinds
The picture volume of format selects the picture of format small in size as treated picture, is stored in the hard disk of server.This
Difference of the volume deviation of two width pictures in embodiment actually with regard to the volume of two width pictures.
Step 8: executed above step, server obtain one it is consistent with original image format or converted picture format
Picture, if obtaining the picture different from original image format, continue to original image carry out a lossy compression after obtain with
The identical compressed picture of original image format, while exporting the compressed picture and converted format treated picture, it deposits
Storage is in the hard disk of server, if obtaining the identical picture of picture format, directly exports, is stored in the hard disk of server.This
When can also will converted the picture after format analysis processing and carry out once format conversion, be converted to the format of original image, then one
And it is output in the hard disk of server.The picture type of output can select according to the needs of users, and execute step 9.
Step 9: the picture for exporting a WEBP format for original image is spare (chrome support), is stored in the hard disk of server
In.
Step 10: server can also by all picture presentations exported after above-mentioned processing in the computer interface of user,
It selects, while can also recommend for user one such or several for user.
Image processing method in the present embodiment can be used for server and handle picture, support user customized
Compression ratio and batch processing.Suitable picture format can be selected for user automatically, avoid making since picture format is inappropriate
At picture volume it is excessive, the problems such as bandwidth waste.
In addition, for the original image of the formats such as picture such as bmp, gif of extended formatting, it can also be in present inventive concept
Under enlightenment, according to the own characteristic of these picture formats and the characteristics of other property parameters of the picture, format conversion and pressure are carried out
Contracting optimization, the picture optimized.
For example, being not processed if original image is dynamic gif picture, if original image is static gif, turn
It is changed to the picture of jpg format, then reduced volume, because jpg is better than gif in image quality, but volume is not necessarily, finally chooses
The picture of picture small in size as output.
Embodiment 6:
A kind of picture processing unit is provided in the present embodiment, is handled for the picture to PNG format, structural block diagram is such as
Shown in Fig. 8, including
Property extracting module: determining the attribute information of original image, wherein the original image is PNG format image, institute
Stating attribute information includes transparent characteristic, area, color value；
Lossless compression modules: lossless compression is carried out to original image and obtains intermediate picture；
Judge conversion module: judging the transparent characteristic of the original image, when transparent pixels point is not present, judges original
The area or color value of picture, if original image area is less than area threshold or original image color value is less than color threshold,
Then PNG8 format picture is converted by the intermediate picture；Otherwise the intermediate picture is compressed, and by the middle graph
Piece is compressed again after being converted to JPG format, the volume of more compressed two width picture, figure small in size after selection compression
Piece.
Preferably, judge that conversion module is also used to judge when there are transparent pixels point, then to intermediate picture compression and turn
Turn to the picture with transparent PNG8 format.
It is further preferred that judging that the compression in conversion module is lossy compression.
The compression ratio of lossy compression described in the present embodiment is 75%, and the area threshold is 10000 pixels, the face
Chromatic threshold value is 30000 kinds of different colours.In other implementations, the compression ratio of the lossy compression is 70%-80%, institute
Stating area threshold is 500 pixels to 22500 pixels, and the color threshold is 20000 to 35000 kinds of different colours.
The optimization processing to PNG format image may be implemented in picture processing unit in the present embodiment, provides for user
Original image optimize processing in conjunction with the contents attribute and format characteristic of picture, obtain preferred format and performance shape
Formula optimizes the expression way of picture.
Embodiment 7:
Another picture processing unit is provided in the present embodiment, is handled for the picture to JPG format, structural frames
Figure is as shown in figure 9, include
Extraction module: obtaining the attribute information of original image, and the original image is JPG format picture, the picture
Attribute information includes picture area and picture color value；
Judgment module: judging whether the area of original image is less than area threshold, if not, original image is compressed
The first format picture is obtained, and converts original image to after PNG format and is compressed to obtain the second format picture, calculates first
The volume deviation of format picture and the second format picture, if the volume deviation is less than the color value of deviation threshold and original image
Greater than color threshold, the first format picture is selected, is otherwise selected small in size in the first format picture and the second format picture
Picture.
Preferably, the judgment module is also used to judge whether the area of original image is less than area threshold, if so, then will
Original image is converted to PNG8 format picture.
In addition, the boil down in the judgment module is lossy compression.
In other implementations, the attribute information further includes the former compression ratio of original image, the judgment module
Further include obtaining compression ratio submodule: the compression ratio of the lossy compression is obtained, if the former compression ratio of original image is greater than
75%, then using 75% as the lossy compression compression ratio；If the former compression ratio of original image is less than 75%, with original
Compression ratio when the former compression ratio of picture is the lossy compression.
In the present embodiment, first format picture is JPG format picture, and second format picture is PNG format figure
Piece.The area threshold is 10000 pixels, and the color threshold is 30000 kinds of different colours, and the volume deviation threshold value is
50k.In other embodiments,.The area threshold is 500 pixels to 22500 pixels, and the color threshold is
20K to 50k may be selected in 20000-35000 kind different colours, the volume deviation threshold value.
The optimization processing to JPG format picture may be implemented in picture processing unit in the present embodiment, provides for user
Original image optimize processing in conjunction with the contents attribute and format characteristic of picture, obtain preferred format and performance shape
Formula optimizes the expression way of picture.
Embodiment 8:
A kind of picture processing platform is provided in the present embodiment, while including the picture processing unit in above-described embodiment 6 and 7
With storage equipment, for the picture processing unit for handling picture, the storage equipment is right for the picture that stores that treated
The picture is handled, and can be used in the services such as the picture upload in website, shared, storage.It is flat in the processing of other pictures
In platform, any picture processing unit in above-described embodiment 6 or 7 can also be only included.
The picture processing platform is a kind of intelligent image platform, also referred to as intelligence figure platform.User is using a picture
When, it is often desired to picture quality is good, small in size, this needs does a tradeoff between picture image quality and volume.Intelligence figure platform
The picture compression demand of PNG, JPEG, GIF multiple format is blended together, the operability and selectivity of user are more convenient.
Meanwhile intelligence figure platform is embodied in intelligence.User is often not clear a picture when selecting picture format
PNG format or jpeg format should be used, is using PNG32 or PNG8 or alpha+PNG8, so intelligence figure platform
In picture processing unit help the suitable and optimal picture format of user's automatic conversion, as recommending format to be pushed to use
Family.Since the picture of WEBP format now starts gradually popular, intelligence figure platform also will be the figure of user's conversion portion WEBP format
The picture volume of piece, WEBP format can be smaller relative to JPEG, and image quality is more preferable.
The technology used mainly includes the library HTML5 File API, ImageMagick, the library PNGCRUSH, the library PNGQUANT,
And the picture optimized treatment method in above-described embodiment.Wherein, HTML5 File API: provide user pull uploading pictures with
Click the foreground interface of uploading pictures.ImageMagick provides picture switching foundation, provides picture compression, picture WEBPization etc.
Image converting method.PNGCRUSH realizes PNG lossless compression algorithm library.PNGQUANT realizes PNG Lossy Compression Algorithm library.
In the processing routine of picture processing unit, the image processing method in above-mentioned other embodiments is utilized, according to
The format and attribute of current image are handled, such as, original image JPEG, first acquisition original image attribute, further according to original image attribute, needle
Whether picture, which properly switchs to the picture of PNG or PNG8, is judged to the parameter (color value number, area value, transparency etc.) of picture, most
The volume of comparison front and back picture afterwards, preferentially adopts.It has all been discussed in detail in the specific embodiment of method in front, it is no longer superfluous
It states.
Concrete operations are as follows:
(1) enter the page, (picture format can be for user's click one picture of upload or one picture of pulling upload
PNG,JPEG,GIF)
(2) picture processing platform is that user selects suitable compression quality and recommends suitable picture format automatically.
(3) user can compare the image quality of new picture and original image on the page, provide panorama sketch comparison and thumbnail comparison.
(4) if the image quality volume of dissatisfied picture, user may be selected other compression ratios and re-compress picture.
(5) user can download the new picture after conversion.
(6) batch uploading pictures, batch download pictures are supported.
Picture processing platform in the present embodiment, will need to upload or shared picture by being carried out after above-mentioned processing on
It passes, improves the quality of picture.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Claims (19)
1. a kind of image processing method, which is characterized in that including
The attribute information of original image is obtained, the original image is JPG format picture, and the attribute information of the picture includes figure
Piece area and picture color value, the picture color value refer to the quantity of possessed color in the pixel for including in picture；
Judge whether the area of original image is less than area threshold, when being not less than area threshold, then presses original image
Contracting obtains the first format picture, and converts original image to after PNG format and is compressed to obtain the second format picture, calculates the
The volume deviation of one format picture and the second format picture, if the volume deviation is less than volume deviation threshold value and original image
Color value is greater than color threshold, selects the first format picture, otherwise selects the body in the first format picture and the second format picture
The small picture of product, wherein first format picture is JPG format picture, second format picture is PNG format image.
2. the method according to claim 1, wherein judge whether the area of original image is less than area threshold,
If so, original image is then converted to PNG8 format picture.
3. method according to claim 1 or 2, which is characterized in that described to be compressed original image to obtain the first lattice
Formula picture, and convert original image to and compressed to obtain in the processing of the second format picture after format to be selected, the compression
For lossy compression.
4. according to the method described in claim 3, it is characterized in that, the attribute information further includes the former compression of original image
Than.
5. according to the method described in claim 4, it is characterized in that, further including having described in acquisition before the lossy compression
The process of the compression ratio of compression is damaged, if the former compression ratio of original image is greater than 75%, using 75% as the lossy compression
Compression ratio；If the former compression ratio of original image is less than 75%, with the former compression ratio of original image for the lossy compression
When compression ratio.
6. method according to claim 1 or 2, which is characterized in that the area threshold is 500 to 22500 pixels, institute
Stating color threshold is 20000-35000 kind different colours.
7. method according to claim 1 or 2, which is characterized in that the area threshold is 10000 pixels, the face
Chromatic threshold value is 30000 kinds of different colours.
8. method according to claim 1 or 2, which is characterized in that the volume deviation threshold value is 20K to 50k.
9. method according to claim 1 or 2, which is characterized in that the volume deviation threshold value is 50k.
10. a kind of picture processing unit, including
Extraction module: obtaining the attribute information of original image, and the original image is JPG format picture, the attribute of the picture
Information includes picture area and picture color value, and the picture color value refers to possessed face in the pixel for including in picture
The quantity of color；
Judgment module: judging whether the area of original image is less than area threshold, if not, original image is compressed to obtain
First format picture, and convert original image to after PNG format and compressed to obtain the second format picture, calculate the first format
The volume deviation of picture and the second format picture, if the volume deviation is less than the color value of volume deviation threshold value and original image
Greater than color threshold, the first format picture is selected, is otherwise selected small in size in the first format picture and the second format picture
Picture, wherein first format picture is JPG format picture, second format picture is PNG format image.
11. device according to claim 10, which is characterized in that the judgment module is also used to judge the face of original image
Whether product is less than area threshold, if so, original image is then converted to PNG8 format picture.
12. device described in 0 or 11 according to claim 1, which is characterized in that the boil down in the judgment module is
Lossy compression.
13. device according to claim 12, which is characterized in that the attribute information further includes the former compression of original image
Than.
14. device according to claim 13, which is characterized in that the judgment module further includes obtaining compression ratio submodule
Block: obtaining the compression ratio of the lossy compression, if the former compression ratio of original image is greater than 75%, has described in using 75%
Damage the compression ratio of compression；If the former compression ratio of original image less than 75%, has with the former compression ratio of original image to be described
Compression ratio when damage compression.
15. device described in 0 or 11 according to claim 1, which is characterized in that the area threshold is 500 pixels to 22500
Pixel, the color threshold are 20000-35000 kind different colours.
16. device described in 0 or 11 according to claim 1, which is characterized in that the area threshold is 10000 pixels, described
Color threshold is 30000 kinds of different colours.
17. device described in 0 or 11 according to claim 1, which is characterized in that the volume deviation threshold value is 20K to 50k.
18. device described in 0 or 11 according to claim 1, which is characterized in that the volume deviation threshold value is 50k.
19. a kind of picture processing platform using any one of claim 10-18 described device, which is characterized in that including
Picture processing unit and storage equipment, the picture processing unit is for handling picture, and the storage equipment is for depositing
Store up the picture processing unit treated picture.
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| CN108111858B (en) * | 2016-11-24 | 2020-06-05 | 腾讯科技（深圳）有限公司 | Picture compression method and device |
| CN107105341B (en) * | 2017-03-30 | 2020-02-21 | 联想(北京)有限公司 | Video file processing method and system |
| CN106998487A (en) * | 2017-04-27 | 2017-08-01 | 努比亚技术有限公司 | image processing method, device and mobile terminal |
| CN108920548A (en) * | 2018-06-14 | 2018-11-30 | 上海爱优威软件开发有限公司 | The multi-format storage method and system of photo |
| CN109271540B (en) * | 2018-09-26 | 2021-05-25 | 浙江万朋教育科技股份有限公司 | Implementation method for combining picture lossy compression and recording transparency information |
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