CN106204672A - Texture compression document generating method - Google Patents
Texture compression document generating method Download PDFInfo
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- CN106204672A CN106204672A CN201610628324.9A CN201610628324A CN106204672A CN 106204672 A CN106204672 A CN 106204672A CN 201610628324 A CN201610628324 A CN 201610628324A CN 106204672 A CN106204672 A CN 106204672A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T9/00—Image coding
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Abstract
The disclosure discloses the method and device of a kind of texture compression file generated, and the method includes: obtain view data to be compressed；Target resolution according to input and described view data to be compressed, generate the header file with mark action；Extract in described view data to be compressed the colored pixels of image and separate with the transparent channel of image and by both；According to described target resolution, described transparent channel is adjusted；Transparent channel after adjusting and described colored pixels are carried out texture compression；Transparent channel after compression, the colored pixels after compression are encapsulated with described header file.The present invention improves the compression ratio of texture, greatly reduces the occupancy of internal memory, and the present invention can popularization and application on the equipment of all support OPENGL ES 2.0, the suitability is high.
Description
Technical field
The disclosure is used for image real time transfer, a kind of texture compression file generated side for image real time transfer
Method.
Background technology
Along with the progress of science and technology, mobile phone is while becoming one of requisite the articles for daily use of people, and it is possessed
Function gets more and more, and such as, plays game etc. on mobile phone.
Want to realize playing the similar functions such as game on mobile phone, then the graphic hardwares such as GPU, i.e. video card are then to support game
The requisite hardware device etc. in function.Texture in image can be processed by GPU.Texture is to calculate because image is drawn
One-dimensional, the two-dimentional or multidimensional data item array used when the color of the produced fragment of rasterisation in face or outward appearance.Texture is permissible
It is view data (photograph or computer generate), color or transparency data, roughness/smoothness data, reflectance number
According to etc..The figure providing true to nature typically requires a lot of high-quality detail textures.There is provided such texture may increase the weight of can use
Internal memory and the burden of bandwidth.GPU can allow texture to keep compressive state in hardware device, on required sample in real time
1 decompresses thus reduces complete image, and required internal memory and amount of bandwidth can be greatly decreased.
Color that texture includes or transparency data, be colored pixels and transparent channel.Under many application scenarios, example
Such as game, 3D model etc., on the basis of carrying out texture compression to colored pixels, it would be preferable to support the compression of transparent channel can enter one
Step improves compression ratio, the internal memory needed for minimizing and amount of bandwidth.
But, due to reasons such as standards, it is little that the compress technique of existing support transparent channel texture compression can be only applied to one
In part mobile device.At present, most of mobile devices only support OpenGL ES 2.0.OpenGL ES 2.0 is
A kind of industrywide standard application programming interface (API) that Khronos group formulated in March, 2007, can be greatly improved
The 3D figure rendering speed of different consumer-elcetronics devices, achieves comprehensive programmable 3D figure in embedded system.
The compress technique of existing support transparent channel compression, such as PVRTC texture compression is not incorporated into OPENGL ES
Within the standard of 2.0.In other words, PVRTC technology can be only applied in sub-fraction mobile device, such as IMAGINE
On the GPU chip that TECHNOLOGIES company authorizes.The most a texture compression techniques supporting transparent channel can not
It is widely used in the mobile devices such as mobile phone, therefore, it is achieved in the standard of OpenGL ES 2.0, supports the texture of transparent channel
Compression becomes as extremely urgent problem.
Summary of the invention
Defect in view of above-mentioned existence, it is necessary to provide a kind of texture compression document generating method, it is achieved that at OpenGL
In the standard of ES 2.0, support the texture compression of transparent channel.The disclosure provides a kind of texture compression document generating method, described
Method includes:
Obtaining view data to be compressed, described view data to be compressed includes image itself and the data letter associated with image
Breath；
Target resolution according to input and described view data to be compressed, by described target resolution and described to be compressed
In view data, any one or more data merge, and generate the header file with mark action；
Extract the transparent channel of image in described view data to be compressed, by the color picture of image in described view data to be compressed
Element separates with the transparent channel of image；
According to described target resolution, described transparent channel is carried out resolution adjustment, by continuous for the resolution of described transparent channel
Turn down, until being equal to described target resolution；
Transparent channel after adjusting and described colored pixels are carried out texture compression, and the technology that described texture compression uses includes
ETC texture compression；
Transparent channel after compression, the colored pixels after compression are encapsulated with described header file.
It addition, there is a need to provide a kind of texture compression file creating apparatus, this device includes:
First acquiring unit, is used for obtaining view data to be compressed, described view data to be compressed include image itself and with
The data message of image association；
Header file generation module, for the target resolution according to input and described view data to be compressed, by described target
In resolution and described view data to be compressed, any one or more data merge, and generate the head with mark action
File；
Separative element, for extracting the transparent channel of image in described view data to be compressed, by described view data to be compressed
In colored pixels separate with the transparent channel of image；
Resolution adjustment module, for carrying out resolution adjustment according to described target resolution to described transparent channel, by described
The resolution of transparent channel is constantly turned down, until being equal to described target resolution；
Compression unit, for the transparent channel after adjusting and described colored pixels are carried out texture compression, described texture compression makes
Technology include ETC texture compression；
Encapsulation unit, for encapsulating the transparent channel after compression, the colored pixels after compression with described header file.
Embodiment of the disclosure that the technical scheme of offer can include following beneficial effect:
The present invention is by obtaining view data to be compressed；Target resolution according to input and view data to be compressed, generate
There is the header file of mark action；Extract the transparent channel of image in view data to be compressed, by image in image to be compressed
Colored pixels separates with the transparent channel of image, it is simple to follow-up to color with the process of images transparent passage；According to described target
Resolution carries out resolution adjustment to described transparent channel；Transparent channel after adjusting and described colored pixels are carried out texture pressure
Contracting；Transparent channel after compression, the colored pixels after compression are encapsulated with described header file, to support OpenGL ES's 2.0
Based on standard, achieving the support to transparent channel texture compression on this basis, the method can be widely applied for mostly
In number mobile device, substantially increase popularization.
It should be appreciated that it is only exemplary that above general description and details hereinafter describe, can not be limited this
Open.
Accompanying drawing explanation
Accompanying drawing herein is merged in description and constitutes the part of this specification, it is shown that meet the enforcement of the present invention
Example, and in description together for explaining the principle of the present invention.
Fig. 1 is the method flow diagram of method for compressing image in an embodiment；
Fig. 2 is with according to the target resolution inputted and described view data to be compressed, the method generating header file step in Fig. 1
Flow chart；
Fig. 3 is the method flow diagram that described transparent channel is adjusted in Fig. 1 step according to described target resolution；
Fig. 4 is the schematic diagram that transparent channel subtracts resolution algorithm；
Fig. 5 is the device schematic diagram of image compressing device in an embodiment；
Fig. 6 is the device schematic diagram of header file generation module in Fig. 4；
Fig. 7 is the device schematic diagram of Fig. 4 intermediate-resolution adjusting module.
Detailed description of the invention
Here in detail exemplary embodiment will be performed explanation, its example represents in the accompanying drawings.Explained below relates to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represents same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the present invention.On the contrary, they are only with the most appended
The example of the apparatus and method that some aspects that described in detail in claims, the present invention are consistent.
In one embodiment, refer to Fig. 1, concrete, the method and device of this texture compression file generated, including:
Step 110, obtains view data to be compressed.
View data to be compressed includes that image and the picture format mark of image binding, image copyright, image are made
Person, image resolution ratio, the height of image and the width etc. of image.The mode obtaining view data to be compressed can be by inspection
Survey user and choose image behavior to be compressed, and then obtain the view data to be compressed associating storage with image to be compressed.
Step 120, according to target resolution and the view data to be compressed of input, generates the head literary composition with mark action
Part.
Target resolution is the required resolution of user's input.
Arbitrary data information in target resolution and view data to be compressed is merged, generates and there is mark action
Header file, by header file memory buffer region corresponding for header file write.
Step 130, extracts the transparent channel of image in view data to be compressed, by the face of image in view data to be compressed
The transparent channel of color pixel and image separates.
In the application scenarios such as great majority such as mobile phone games, the resolution requirement to transparent channel is not the highest, so,
The resolution of transparent channel can be carried out the adjustment such as reduction, and block-printing series of books reduces memory usage and saves memory space.Say at this
The transparent channel of image individually extracts, and separates with the colored pixels in image, in order to transparent logical in subsequent step
Road resolution channels is adjusted.
It addition, most compress techniques supporting OpenGL ES 2.0 standards directly image is carried out texture compression may
Causing the loss of transparent channel, this step also protects transparent channel simultaneously and is not lost.
Step 140, is adjusted transparent channel according to target resolution.
It has been observed that the transparent channel in image to be compressed has adjustable space, differentiate according to the target of user's input
Transparent channel is adjusted by rate, until the resolution of transparent channel is equal to target resolution.
Step 150, carries out texture compression to the transparent channel after colored pixels and adjustment.
It should be noted that texture compression described here must be to support the texture of OpenGL ES 2.0 standard
Compress technique, the ETC1 technology such as researched and developed by Ericsson.
It addition, preset depositing of correspondence for the transparent channel after colored pixels after carrying out texture compression, compression
Colored pixels relief area and transparent channel relief area.Colored pixels relief area colored pixels after depositing compression, transparent logical
The relief area, road transparent channel after depositing compression.Colored pixels relief area and transparent channel relief area are closely coupled.
Step 160, encapsulates the transparent channel after compression, the colored pixels after compression with header file.
Transparent channel after compression is extracted in relief area, the colored pixels after compression and header file, according to header file
Headed by, transparent channel is that the order at end is packaged packing, generates format file.
By above-mentioned steps, on the basis of supporting OpenGL ES 2.0, it is achieved that transparent channel texture compression is propped up
Hold, colored pixels is separated with transparent channel meanwhile, transparent channel resolution is adjusted accordingly, decrease accounting for of internal memory
By rate, the format file ultimately generated contrasts the RGBA format file of 32 and compares, and compression ratio improves 25%, and can popularize
It is applied on the equipment of all support OPENGL ES 2.0, there is high broad applicability.
Further, referring to Fig. 2, step 120 also includes:
Step 121, obtains the target resolution of input.
Concrete, preset multiple resolution options, such as, 1:1,1:4,1:16 etc..By detection user, resolution is selected
Choose behavior thus obtain the target resolution of input.It addition, the mode obtaining target resolution can also is that preset one
Individual input frame, by the detection information that inputs in frame of user thus obtain target resolution or other modes.
Step 123, reads width information and the length information of image in view data to be compressed, is believed by the width of image
The target resolution of breath, length information and input merges, and generates the header file with mark action.
Further, referring to Fig. 3, Fig. 4, step 140 includes:
Step 141, by the width of transparent channel and the high half all reducing to original numerical value, generates new transparent channel, newly-generated
The resolution of transparent channel is 1/4th before adjusting.
In image, transparent channel (ALPHA) is the array of pixels of 8 (BITS).0 represents all-transparent, and 255 have represented
The opaquest, middle different size of numerical value represents different translucent pixels.The present invention supports 1:1,1:4,1:16 or 1:64
Transparent channel (ALPHA) resolution.The wide and high of transparent channel all can be reduced 1/2.
The width of the 1:1 resolution, i.e. transparent channel of doing is equal to former width, high in former height；1:4 resolution, the most thoroughly
Bright passage wide equal to former width/2, high in former height/2；1:16 resolution, i.e. transparent channel wide equal to former width/4,
High in former height/4；1:64 resolution, i.e. transparent channel wide equal to former width/8, high in former height/8.
Step 143, according to target resolution, differentiates newly-generated transparent channel, if newly-generated transparent channel is differentiated
Rate is equal to target resolution, carries out subsequent step；If repeating above-mentioned coordinating step, until generate is transparent
Channel resolution is equal to target resolution.
Such as, the target resolution of user's input is 1:64, is 1:1, now differentiates before transparent channel resolution adjustment
Go out transparent channel resolution and target resolution, the wide of transparent channel and height are respectively reduced 1/2, generate new transparent logical
Road, its resolution is 1/4th before adjusting, and the resolution now determining newly-generated transparent channel is still differentiated with target
Rate, carries out the adjustment of step 141 on the basis of with above-mentioned transparent channel resolution 1:4, the step for can circulate always
To the resolution that transparent channel resolution is down to the needs that user is inputted.
Further, the texture compression techniques that step 150 uses includes that Ericsson compresses.
It should be noted that this technical method can also be applied in some versatilities not as the texture compression of ETC, do not limit
What ETC. such as PVRTC2, PVRTC4, JPEG.Additionally, in one embodiment, the dress of a kind of compression of images is also provided for
Putting, refer to Fig. 5, device includes the first acquiring unit 210, header file generation module 220, separative element 230, resolution adjustment
Module 240, compression unit 250 and encapsulation unit 260, wherein,
First acquiring unit 210, is used for obtaining view data to be compressed；
Header file generation module 220, for the target resolution according to input and view data to be compressed, generates and has mark
The header file of effect；
Separative element 230, for extracting the transparent channel of image in view data to be compressed, and will scheme in view data to be compressed
The colored pixels of picture separates with the transparent channel of image；
Resolution adjustment module 240, for being adjusted transparent channel according to target resolution；
Compression unit 250, for carrying out texture compression to the transparent channel after colored pixels and adjustment；
Encapsulation unit 260, for encapsulating the transparent channel after compression, the colored pixels after compression with header file.
In one embodiment, refer to Fig. 6, header file generation module 220 includes:
Second acquisition unit 221, for obtaining the target resolution of input；
Combining unit 223, for reading width information and the length information of image in view data to be compressed, by the width of image
The target resolution of information, length information and input merges, and generates header file.
In one embodiment, refer to Fig. 7, resolution adjustment module 240 includes:
Resolution adjustment unit 241, for by the width of transparent channel and the high half all reducing to original numerical value, generates new transparent
Passage, the resolution of newly-generated transparent channel is 1/4th before adjusting；
Judgement unit 243, for according to target resolution, differentiates newly-generated transparent channel, if newly-generated is transparent
Channel resolution is equal to target resolution, carries out subsequent step；If repeating above-mentioned coordinating step, until raw
The transparent channel resolution become is equal to target resolution.
It should be appreciated that the invention is not limited in precision architecture described above and illustrated in the accompanying drawings, and
And various modifications and changes can performed without departing from the scope.The scope of the present invention is only limited by appended claim.
Claims (8)
1. a texture compression document generating method, it is characterised in that including:
Obtain view data to be compressed；
Target resolution according to input and described view data to be compressed, generate the header file with mark action；
Extract the transparent channel of image in described view data to be compressed, by the color picture of image in described view data to be compressed
Element separates with the transparent channel of image；
According to described target resolution, described transparent channel is carried out resolution adjustment；
Transparent channel after adjusting and described colored pixels are carried out texture compression；
Transparent channel after compression, the colored pixels after compression are encapsulated with described header file.
Method for compressing image the most according to claim 1, it is characterised in that described according to input target resolution and
Described view data to be compressed, the step generating the header file with mark action includes:
Obtain the target resolution of input；
Read width information and the length information of image of image in described view data to be compressed, the width of described image is believed
The target resolution of breath, length information and described input merges, and generates the header file with mark action.
Method for compressing image the most according to claim 1, it is characterised in that described according to described target resolution to described
The step that transparent channel is adjusted includes:
By the width of described transparent channel and the high half all reducing to original numerical value, generate new transparent channel, described newly-generated
The resolution of transparent channel is 1/4th before adjusting；
According to described target resolution, described newly-generated transparent channel is differentiated, if described newly-generated transparent channel
Resolution is equal to described target resolution, carries out subsequent step；If repeating above-mentioned coordinating step, until raw
The transparent channel resolution become is equal to target resolution.
Method the most according to claim 1, it is characterised in that described to the transparent channel after adjusting and described colored pixels
Carry out in the step of texture compression, carry out the method that described texture compression used and include ericsson texture compression.
5. a texture compression file creating apparatus, it is characterised in that including:
First acquiring unit, is used for obtaining view data to be compressed；
Header file generation module, for the target resolution according to input and described view data to be compressed, generates and has mark
The header file of knowledge effect；
Separative element, for extracting the transparent channel of image in described view data to be compressed, by described view data to be compressed
In colored pixels separate with the transparent channel of image；
Resolution adjustment module, for carrying out resolution adjustment according to described target resolution to described transparent channel；
Compression unit, for carrying out texture compression to the transparent channel after adjusting and described colored pixels；
Encapsulation unit, for encapsulating the transparent channel after compression, the colored pixels after compression with described header file.
Image compressing device the most according to claim 5, it is characterised in that described header file generation module includes:
Second acquisition unit, for obtaining the target resolution of input；
Combining unit, for reading width information and the length information of image of image in described view data to be compressed, by institute
The target resolution stating the width information of image, length information and described input merges, and generates the head literary composition with mark action
Part.
Image compressing device the most according to claim 5, it is characterised in that described resolution adjustment module includes:
Resolution adjustment unit, for by the width of described transparent channel and the high half all reducing to original numerical value, generates new saturating
Bright passage, the resolution of described newly-generated transparent channel is 1/4th before adjusting；
Judgement unit, for according to described target resolution, differentiates described newly-generated transparent channel, if described new life
The transparent channel resolution become is equal to described target resolution, carries out subsequent step；If repeating above-mentioned resolution adjustment
Step, until the transparent channel resolution generated is equal to target resolution.
Image compressing device the most according to claim 5, it is characterised in that the compress technique bag that described compression unit uses
Include Ericsson's compression.
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| CN107507125A (en) * | 2017-08-31 | 2017-12-22 | 郑州云海信息技术有限公司 | Alpha passage palettes generation method, system and host side in a kind of WebP compression of images |
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| CN108460822A (en) * | 2017-02-15 | 2018-08-28 | 上海银河数娱网络科技有限公司 | Texture Processing Methods and device |
| CN110189384A (en) * | 2018-02-22 | 2019-08-30 | 深圳市萌蛋互动网络有限公司 | Method for compressing image, device, computer equipment and storage medium based on Unity3D |
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| CN110189384A (en) * | 2018-02-22 | 2019-08-30 | 深圳市萌蛋互动网络有限公司 | Method for compressing image, device, computer equipment and storage medium based on Unity3D |
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