CN103903285B - Thumbnail extraction method of PNG image and BMP image - Google Patents
Thumbnail extraction method of PNG image and BMP image Download PDFInfo
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- CN103903285B CN103903285B CN201210572320.5A CN201210572320A CN103903285B CN 103903285 B CN103903285 B CN 103903285B CN 201210572320 A CN201210572320 A CN 201210572320A CN 103903285 B CN103903285 B CN 103903285B
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Abstract
A thumbnail extraction method of a PNG image and a BMP image is disclosed. The application discloses a thumbnail extraction method of a PNG image, comprising the following steps: as for a non-interlaced PNG image, a buffer with the space occupied by two lines of pixels so as to store pixel values of the current line and the last line before decoding; the PGN image is gradually decoded line by line from the first line, and a rebuilt decoded pixel value in each line undergoes downsampling to obtain a pixel value of a corresponding line of a target thumbnail; during decoding line by line, after decoding of the current line except the first line, the pixel value of the last line before decoding is moved out of the buffer, the pixel value of the next line before decoding is written into the buffer, and the next line is used as the current line for decoding. With the application of the extraction method, memory costs of a system can be saved.
Description
Technical field
The application is related to image processing techniquess, more particularly to a kind of thumbnail extracting method of BMP images.
Background technology
Personal computer can access be stored on itself hard disk, other external equipments, network multimedia file (depending on
Frequently, music, picture etc.), and provided the user the thumbnail preview function for browsing these document profiles.In DTV, handss
Machine etc. also possesses same preview function based on the display device of embedded system.Wherein, preview picture can be carried to user
For intuitively image content general picture, with very high practical value.
Because image file is less, storage medium can store substantial amounts of image file.This requires that display device can be with
Original image is quickly processed to generate thumbnail information, and quickly shows thumbnail.
Obtain currently for the thumbnail of image file, existing method has hardware implementation mode, also there is software realization mode.
Wherein, when being realized using hardware, though its speed is fast, its autgmentability, fault-tolerance and multiple format poor compatibility.Using software side
When formula extracts thumbnail, different thumbnail extracting modes can be taken according to different image source formats.
Specifically, for PNG（Portable network figure form）The thumbnail of form, existing method is mainly to artwork
As directly being decoded, then again original image zoomed in and out to obtain thumbnail information.For BMP (Bitmap bitmaps) form
Thumbnail, existing method mainly directly decodes to original image, then again original image is zoomed in and out to be contracted
Sketch map information.
For the thumbnail extraction of the PNG format that above-mentioned software mode is carried out, directly original image is decoded more then is scaled.
For larger-size image, full images decoding can take more Installed System Memory.For example for 1 1920x1080 color space
For the PNG images of RGBA, its full figure decoding, storing decoding image will consume the Installed System Memory of 8M, be unfavorable for that multiple image is carried
Take thumbnail.
For the thumbnail extraction of the BMP forms that above-mentioned software mode is carried out, directly original image is decoded more then is scaled.
Because the image of BMP forms is often than larger (the BMP images such as 24bit are most commonly seen), decoding can take more internal memory and consumption
Take the long period, it is difficult to meet real-time display requirements.For example：One resolution for 1920x1080 24bitBMP images, full figure
As decoding is scaled again it is necessary to consume the Installed System Memory of 6M, and each pixel reads and stores one time and takes very much, it is impossible to full
The requirement shown when full, is also unfavorable for extracting thumbnail to multiple image.
The content of the invention
This application provides a kind of thumbnail extracting method of PNG images and a kind of thumbnail extracting method of BMP images,
Installed System Memory consumption can be greatlyd save, the extraction rate of thumbnail is improved.
A kind of thumbnail extracting method of PNG images, including：
For the PNG images of non-interwoven, open up the buffering of space size shared by 2 row pixels, for store current line and
The decoding preceding pixel value of its lastrow；
The PNG images are started from the first row to carry out rebuilding pixel value after decoding process, and the decoding to every row line by line
Carry out the corresponding row pixel value that down-sampling obtains target thumbnail；Wherein, it is described carry out decoding process line by line when, to except first
After the completion of current line decoding outside row, the decoding preceding pixel value of the lastrow is removed into the buffering, then by next line
Decoding preceding pixel value writes the buffering, and is decoded next line as current line.
It is preferred that the method is further included：After the reconstruction pixel value to current line carries out down-sampling, the method enters one
Step includes：According to the |input paramete of image display, determine whether decoded reconstruction pixel value needs to carry out colour mixture process,
If it is required, then carrying out being input into display device after colour mixture process to the pixel value after current line down-sampling；Otherwise, directly will be current
Pixel value input display device after row down-sampling.
It is preferred that when it is R, G, B, A four-way pixel value that display device requires the data form of input, it is determined that need not
Carry out colour mixture process.
It is preferred that when it is R, G, B triple channel pixel value that display device requires the data form of input, it is determined that needing to carry out
Colour mixture process；
The colour mixture is processed as：According to R, G, B, A calculated for pixel values of each pixel rebuildWherein, BG is background color, black background BG=0, white background BG=1, and R ', G ', B ' are colour mixture
Pixel value afterwards, for carrying out the down-sampling process.
It is preferred that when display device require input data form be Y, Cb, Cr triple channel pixel value when, it is determined that need into
The process of row colour mixture；
The colour mixture is processed as：According to R, G, B, A calculated for pixel values of each pixel rebuildAnd according to R ', G ', B ' calculating
Wherein, BG is background color, black background BG=0, white background BG=1, and Y, Cb, Cr are the pixel value after colour mixture, be used for into
The row down-sampling is processed.
It is preferred that the calculatingFor：Calculate
It is preferred that described according to R ', G ', B ' calculating
For：In advance correspondence R ', G ', all values of B ', calculate corresponding Y, Cb, Cr, and by result of calculation and corresponding R ', G ', B '
Value correspondence is preserved, and is being calculatedWhen, select with it is current
Y, Cb, Cr that R ', G ', B ' values correspondence are preserved is used as result of calculation.
It is preferred that the method is further included：For the PNG images for interweaving, decode closest with target thumbnail dimensions
Piece image, and decoded pixel value is carried out into down-sampling, obtain target thumbnail.
A kind of thumbnail extracting method of BMP images, including：For the BMP images of non-RLE compressed formats, correspondence target
Any pixel of thumbnail, calculates the byte location of the corresponding BMP view data；
Color table index is read on the byte location for calculating and is determined according to the color table index corresponding
Pixel value, or the RGB data on the byte location is directly read, any pixel is corresponding described in write target thumbnail
On position.
It is preferred that the byte location for calculating the corresponding BMP view data includes：
byte=Tstart+linesize×((i-1)×HBMP)/HTHU+((j-1)×WBMP)×pixelsize/(WTHU×8)
Wherein, TstartFor the data start in the BMP images essential information, linesize is the BMP images
The byte number of the often row pixel in master data, pixelsize is the bit of each pixel in the BMP images master data
Number.
As seen from the above technical solution, in the application, for the PNG images of non-interwoven, space shared by 2 row pixels is opened up
The buffering of size, for storing the decoding preceding pixel value of current line and its lastrow；PNG images are started to enter line by line from the first row
Row decoding process, and carry out the corresponding row pixel value that down-sampling obtains target thumbnail to rebuilding pixel value after the decoding of every row.
When decoding process is carried out line by line, after the completion of decoding to the current line in addition to the first row, by the decoding preceding pixel value of lastrow
Buffering is removed, then by the decoding preceding pixel value write buffering of next line, and decoded next line as current line.So,
In whole decoding process, it is only necessary to store the decoding preceding pixel value of 2 row images, Installed System Memory when greatling save decoding disappears
Consumption.
Description of the drawings
Fig. 1 is the thumbnail extracting method schematic flow sheet of PNG images in the embodiment of the present application；
Fig. 2 is the thumbnail extracting method schematic diagram of BMP images in the application.
Specific embodiment
In order that the purpose of the application, technological means and advantage become more apparent, the application is done below in conjunction with accompanying drawing
Further describe.
Fig. 1 is the thumbnail extracting method schematic flow sheet of PNG images in the embodiment of the present application.As shown in figure 1, the method
Including：
Step 101, judges whether present image is the image of PNG format, if it is, step 102 is continued executing with, if
It is not to exit；
Step 102, parses the header of PNG images, obtains the essential information of the image.
Wherein, the essential information of acquisition includes：The wide W of original imageORGWith high HORG, locating depth, coloured typies and weave type
Deng.
Step 103, it is determined that file weave type, if the PNG images for interweaving, execution step 104, if non-interwoven
PNG images, execution step 105-106.
Step 104, for intertexture PNG image, a width immediate with target thumbnail dimensions in decoding PNG image files
Image, and down-sampling is carried out to the image obtain target thumbnail.
The process of this step is identical with existing mode.It is assumed that IBASEWith target thumbnail dimensions in expression PNG image files
The pixel value of immediate piece image, the high size of target thumbnail width that down-sampling is obtained is respectively WRELAnd HREL, then target
The pixel value I of thumbnail each pixelREL(i, j)=IBASE(HIndex [i], WIndex [j]), wherein, HIndex [] and
WIndex [] is respectively line index array and column index array, and HIndex [] shows IRELLine index to IBASELine index
Mapping relations, WIndex [] shows IRELColumn index to IBASEColumn index mapping relations, these mapping relations are advance
It is calculated according to the size and PNG picture sizes of target thumbnail, specifically can realize according to existing mode, here just not
Repeat again.
Step 105 opens up the buffering of 2 row pixel requisite space sizes for the PNG images of non-interwoven, is designated as prediction slow
Punching, wherein the neighbouring two rows pixel value for storing is designated as respectively line0, line1.
Step 106, starts to carry out rebuilding picture after decoding process, and the decoding to every row line by line to PNG images from the first row
Plain value carries out the corresponding row pixel value that down-sampling obtains target thumbnail.
When decoding process is carried out line by line, can carry out in the following manner：
A, by the decoding preceding pixel of front 2 row write prediction buffering, carry out decoding process to the 1st row, and using the 2nd row as working as
Move ahead；
B, current line is decoded, obtain decoded reconstruction pixel；
C, the decoding preceding pixel value of the lastrow of current line is removed prediction buffering；
D, by the decoding preceding pixel value of the next line of current line write prediction buffering, and return next line as current line
Step B, the decoding until completing entire image.
In the process above, the lastrow of current line is removed into prediction buffering, and during by next line write prediction buffering, it is excellent
Selection of land, can move to lastrow removal prediction slow after lastrow removes prediction buffering by the decoding preceding pixel value of current line
On position before punching, then by the position before the decoding preceding pixel write current line movement of next line.So, prediction is removed every time
The data of buffering are all the data in same position.Here, the reason for preserving two row pixels in prediction buffering allows for solution
The decoding preceding pixel value of lastrow is likely to require during code current line as prediction benchmark.
After step B is often completed when the decoding process of previous row, can carry out to rebuilding pixel value after the current line decoding
Down-sampling obtains the corresponding row pixel value of target thumbnail.That is, down-sampling process can be with step C, D even next time
The execution of step B is synchronously carried out, so as to improve thumbnail acquisition speed.
Wherein, the operation for carrying out down-sampling is identical with the down-sampling in abovementioned steps 104.It is assumed that IBASERepresent current line solution
Pixel value after code reconstruction, the high size of target thumbnail width that down-sampling is obtained is respectively WRELAnd HREL, then target thumbnail is every
The pixel value I of individual pixelREL(i, j)=IBASE(HIndex [i], WIndex [j]), wherein, HIndex [] and WIndex [] is respectively
For line index array and column index array, HIndex [] shows IRELLine index to IBASELine index mapping relations,
WIndex [] shows IRELColumn index to IBASEColumn index mapping relations, these mapping relations are previously according to target
The size and PNG picture sizes of thumbnail is calculated, specifically can realize according to existing mode, just repeats no more here.
When the reconstruction pixel to current line carries out down-sampling process, only by pixel value copy corresponding with target thumbnail
To in target thumbnail, rest of pixels value is not processed.After the pixel value decoding of all rows is completed and realizes that down-sampling is processed,
Stop circulation step B-D.
So far, the thumbnail extracting method of the jpeg image in the application terminates.
Furthermore, it is contemplated that the different requirements of the |input paramete of different display devices, may also need to rebuilding simultaneously down-sampling
Pixel value afterwards carries out colour mixture process（Will transparent chrominance channel be mixed in RGB triple channel）, otherwise image is it is possible that aliasing
Effect.
Based on this, it is preferable that can be after each execution of step B, further execution step E：Shown according to image and set
Standby |input paramete, determines whether decoded RGBA data need colour mixture to process, and processes if necessary to colour mixture, after down-sampling
Pixel value perform corresponding colour mixture and process, and the pixel value input display device after colour mixture is processed；Otherwise, directly adopt by under
Pixel value input display device after sample.
Specifically, the following two kinds tool for judging whether to that colour mixture is processed and corresponding colour mixture is processed is given in the application
Body mode：
1）If what display device required input is the pixel value of R, G, B, A four-way, it is determined that need not carry out colour mixture
Process, directly decoded R, G, B, A are input into into display device；
2）If what display device required input is R, G, B triple channel pixel value, it is determined that need to carry out colour mixture process, have
Body colour mixture is processed as：Colour mixture process is carried out to R, G, B value of each pixel value, the pixel value after colour mixture be respectively R ', G ',
B′：
Colour mixture formula：
Because above formula has division, it is preferable that further can be optimized with displacement：
R′=[(R×A)>>8]+(255-A)×BG
G′=[(G×A)>>8]+(255-A)×BG
B′=[(B×A)>>8]+(255-A)×BG
（Wherein BG be background color, black background BG=0, white background BG=1）
Jing tests find：Division, the thumbnail extraction time after optimization is replaced to contract than thumbnail extraction time with displacement
It is short by 10%～20%, and each pixel precision loss is less than 1, this is significant for rapid extraction PNG image thumbnails have
Effect；
3）If display device require input for Y, Cb, Cr triple channel pixel value, first according to above-mentioned（1）In colour mixture
Formula carries out colour mixture to each pixel and processes to obtain R ', G ', B ', and by the R ' for obtaining, G ', B ' be converted to according to the following formula Y,
Cb, Cr value, using Y, Cb, the Cr as the pixel value input display device after colour mixture.
Meanwhile, above formula is due to there is floating number multiplication, and the span of R ', G ', B ' is 0 to 255, so further to carry
Computationally efficient, it is preferable that can in advance correspond to all values of R ', G ', B ', calculates corresponding Y, Cb, Cr, and will calculate knot
Fruit and the corresponding preservation of corresponding R ', G ', B ' values, for example, stored using form, when colour mixture process is actually carried out, can be direct
According to current R ', G ', B ' values, corresponding Y, Cb, Cr value of determination of tabling look-up, thumbnail extraction rate can Jing after test optimization
Improve 50%.
From implementing for above-mentioned the application, in the application, using decoding line by line decoding PNG images are greatly reduced
During memory cost, internal memory usage amount can be substantially reduced；Jing is tested, for the non-interwoven PNG image of 1 1080p, this
The internal memory usage amount of application method is the 2 ‰ of full figure decoding；For the intertexture PNG image of 1 1080i, the application method internal memory
Usage amount is the 50% of existing method, and the decoding time used shorten to less than the 60% of full figure decoding.The present invention is by decoding and rebuilding
Process is combined with thumbnail pixel extraction process, further reduces computational complexity and time loss.
Fig. 2 is the thumbnail extracting method schematic diagram of BMP images in the application.As shown in Fig. 2 the method includes：
Step 201, judges whether present image is the image of BMP forms, if it is, step 202 is continued executing with, if
It is not to exit；
Step 202, parses the header of BMP images, obtains the essential information of the image.
The essential information of BMP images includes：Image width WBMP, high HBMP, compression type, each pixel bit number
Pixelsize, often row pixel byte number linesize, color table, data start Tstart。
Step 203, if the BMP images are RLE compressed formats, execution step 206 is decoded to image；Otherwise hold
Row step 204；
Step 204, calculates the mapping relations that thumbnail indexes BMP data.
It is assumed that a width of W of target thumbnailTHU, a height of HTHU, here for line index is i (i=1 ..., HTHU), column index is
J (j=1 .., WTHU) breviary index of the picture, its corresponding BMP data byte position so calculates：
byte=Tstart+linesize×((i-1)×HBMP)/HTHU+((j-1)×WBMP)×pixelsize/(WTHU×8)
So only need to calculate following two：
Hi=linesize×((i-1)×HBMP)/HTHU
Wj=((j-1)×WBMP)×pixelsize/(WTHU×8)
The mapping relations are represented by：
byte=Tsart+Hi+Wj
Step 205, for thumbnail I, for its some pixel Ii,j, first by byte=Tstart+Hi+WjObtain its correspondence
Data start byte, read corresponding color table index in the position, then corresponding pixel value is found in color table,
Or directly read in the respective pixel location of RGB data (24bit, 32bit BMP images) write target thumbnail.
Step 206, for the BMP images of RLE compressed formats, first decodes, then according to pantograph ratio to whole image
Example carries out down-sampling, and obtains final thumbnail.
Wherein, the process of down-sampling is identical with the down-sampling in aforementioned PNG image procossings, just repeats no more here.
In the BMP image thumbnails extracting method of above-mentioned the application, for common BMP format-patterns can be substantially reduced
Internal memory usage amount, and with processing speed faster；Jing is tested：For the BMP images of a 1080p, extracting resolution is
The thumbnail of 160x120, the present processes internal memory usage amount is only the 1% of full figure decoding；The decoding time used shorten to entirely
Less than the 10% of diagram code.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvements done etc. should be included within the scope of protection of the invention.
Claims (7)
1. a kind of thumbnail extracting method of PNG images, it is characterised in that include：
For the PNG images of non-interwoven, the buffering of space size shared by 2 row pixels is opened up, for storing current line and thereon
The decoding preceding pixel value of a line；
The PNG images are started from the first row to carry out decoding process line by line, and is carried out to rebuilding pixel value after the decoding of every row
Down-sampling obtains the corresponding row pixel value of target thumbnail；Wherein, it is described carry out decoding process line by line when, to except the first row it
After the completion of outer current line decoding, the decoding preceding pixel value of the lastrow is removed into the buffering, then by the decoding of next line
Preceding pixel value writes the buffering, and is decoded next line as current line；
Wherein, after the reconstruction pixel value to current line carries out down-sampling, the method is further included：According to image display
|input paramete, determine it is decoded reconstruction pixel value whether need to carry out colour mixture process, if it is desired, then to adopting under current line
Pixel value after sample carries out being input into display device after colour mixture process；Otherwise, directly by the pixel value input after current line down-sampling
Display device.
2. method according to claim 1, it is characterised in that when display device require the data form of input be R, G, B,
During A four-way pixel values, it is determined that colour mixture process need not be carried out.
3. method according to claim 1, it is characterised in that when display device requires that the data form of input is R, G, B
During triple channel pixel value, it is determined that needing to carry out colour mixture process；
The colour mixture is processed as：According to R, G, B, A calculated for pixel values of each pixel rebuild
Wherein, BG is background color, black background BG=0, white background BG=1, and R', G', B' are the pixel value after colour mixture, be used for into
The row down-sampling is processed.
4. method according to claim 1, it is characterised in that when display device require the data form of input be Y, Cb,
During Cr triple channel pixel values, it is determined that needing to carry out colour mixture process；
The colour mixture is processed as：According to R, G, B, A calculated for pixel values of each pixel rebuild
And calculated according to R', G', B'Wherein, BG is the back of the body
Scape color, black background BG=0, white background BG=1, Y, Cb, Cr are the pixel value after colour mixture, for carrying out the down-sampling
Process.
5. the method according to claim 3 or 4, it is characterised in that the calculating's
Mode is：Calculate
6. method according to claim 4, it is characterised in that described to be calculated according to R', G', B'For：All values of advance correspondence R', G', B',
Corresponding Y, Cb, Cr are calculated, and by result of calculation preservation corresponding with corresponding R', G', B' value, is being calculatedWhen, select protect corresponding with current R', G', B' value
Y, Cb, the Cr for depositing is used as result of calculation.
7. method according to claim 1, it is characterised in that the method is further included：For the PNG images for interweaving,
Decoding and the immediate piece image of target thumbnail dimensions, and decoded pixel value is carried out into down-sampling, obtain target contracting
Sketch map.
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| CN101520887A (en) * | 2009-03-30 | 2009-09-02 | 北京中星微电子有限公司 | Image zooming method, device and chip |
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| CN1652155A (en) * | 2005-03-28 | 2005-08-10 | 北京中星微电子有限公司 | Method and apparatus for changing digital image size |
| CN100589123C (en) * | 2007-04-23 | 2010-02-10 | 北京中星微电子有限公司 | Device for zooming still image and method thereof |
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