CN110198446A - Image processing method and image processing apparatus - Google Patents
Image processing method and image processing apparatus Download PDFInfo
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- CN110198446A CN110198446A CN201910648996.XA CN201910648996A CN110198446A CN 110198446 A CN110198446 A CN 110198446A CN 201910648996 A CN201910648996 A CN 201910648996A CN 110198446 A CN110198446 A CN 110198446A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
Abstract
The present invention provides a kind of image processing method, comprising: obtains an image block, which has multiple pixels, and each pixel has multiple bits；Determine each pixel in identical bit position with one or more target bit position of identical value；And one or more target bit position and its corresponding bit value are stored as redundant data.
Description
Technical field
The present invention relates to a kind of image processing method and image processing apparatus, especially with regard to removal spatially superfluous
The image processing techniques of remainder evidence (Spatial Redundancy).
Background technique
In the field of image procossing, so-called redundant data spatially is referred among same image (Frame),
Usually there is very strong relevance between adjacent pixel (Pixel).On the other hand, due to the original data volume of image or video
It is often excessively huge, in order to facilitate the storage and transmission of data, it is therefore necessary to compress original data, fixed
Under compression ratio, the content of same image is expressed using less data.Based on above-mentioned two o'clock, in existing image procossing
In, usually first by same image segmentation be multiple block of pixels (Block).Wherein each block of pixels is by multiple
The small area region that adjacent pixel is constituted, such as 8x2 (16 pixels).Then, then as unit of block of pixels, to segmentation
Multiple block of pixels afterwards sequentially carry out image procossing.
After acquirement block of pixels, so that it may obtain brightness (grayscale value) representated by each pixel inside block of pixels
Or color.By taking the image of 24 bit colors as an example, each pixel can use the data of 3 group of 8 bit, describe respectively red
The ingredient of color, green, blue three kinds of colors.Therefore, each color is all the numerical value between 0~255.Have every
After the bit Data of one pixel, so that it may carry out traditional image pressure using the bit Data in a block of pixels
Contracting, and then data volume needed for one block of pixels of reduction.
However, due to the characteristic of redundant data spatially, in the block of pixels of each small area, between each pixel
Numerical value be fairly close.In other words, if 0~255 numerical value is expressed as 2 carry of 8 bits, block of pixels
Between 16 pixels, only there is significant difference in the numerical value of low level member, and the numerical value of high bit is then substantially uniform, such as in height
Some bit of bit possible all 1 or all 0.Therefore, in subsequent image compression process, the data of Gao Weiyuan
It can be continually repeated coding, limited the space encoder of low level metadata, quantifying the data of low level member
(Quantization) lose during, not only cause the waste of coded data, more reduce the quality of compression of images.
Therefore, the present invention provides a kind of image processing method and image processing apparatus, to solve present in the prior art
The problem of.
Summary of the invention
One of them purpose of the present invention is to provide a kind of image processing method and image processing apparatus, using few
For the number of cells of amount to store and indicate redundant data, using reduces the required number of cells encoded of each pixel, then will be superfluous
Outer bit Data carries out traditional compression of images to remainder accordingly.
For purposes of the present invention, the present invention provides a kind of image processing method, comprising: obtains an image block, the figure
Picture block has multiple pixels, and each pixel has multiple bits；Determine each pixel in identical bit position
Upper one or more target bit position with identical value；And by one or more target bit position and its corresponding bit
Value is stored as redundant data.
In certain embodiments, which includes a mask field to store one or more target bit position
It sets and one removes value field to store value corresponding to one or more target bit position.In certain embodiments, should
Image processing method further includes: an image being divided into multiple blocks, and obtains the image block from the multiple block.?
In some embodiments, which is further included: by one or more target of the pixel each in the image block
Bit Data other than bit position is compressed.In certain embodiments, which further includes: will be compressed
The bit Data unzips it；And using the bit Data after the redundant data and decompression, to restore the image
Block.
The present invention also provides a kind of image processing apparatus, including a compression module, to execute following functions: obtaining an image
Block, the image block have multiple pixels, and each pixel has multiple bits；Determine each pixel identical
With one or more target bit position of identical value in bit position；And by one or more target bit position and its right
The bit value answered is stored as redundant data.
In certain embodiments, which includes a mask field to store one or more target bit position
It sets and one removes value field to store value corresponding to one or more target bit position.In certain embodiments, should
One image is more divided into multiple blocks by compression module, and the image block is obtained from the multiple block.In certain implementations
In example, the compression module is more by the bit other than one or more target bit position of the pixel each in the image block
Data are compressed.In certain embodiments, which further includes a decompression module, to execute following functions:
The compressed bit Data of the compression module is unziped it；And using the compression module storage redundant data and
Bit Data after decompression, to restore the image block.
It by the present invention, can both retain the redundant data of high bit, while more spaces can also be saved and go to encode
The data of low level member.Therefore, while improving compression quality, the compression ratio of compression of images can also be effectively improved.
Above-mentioned and other purposes and advantage of the invention, the detailed description described below in reference and claims
It afterwards, will be more obvious and easy to understand.
Detailed description of the invention
Figure 1A indicates the architecture diagram of the electronic system of the image processing apparatus 1 comprising certain embodiment of the invention.
Figure 1B indicates two images 101,102 of the original video 10 in Figure 1A in different time points.
Fig. 1 C indicates the wherein image 101 for being directed to Figure 1B, the image 101 that size is 1920x1080 is cut into more
A size is fixed as the schematic diagram of the image block 101a of 8x2.
Fig. 2 is the schematic diagram 200 that redundant data is determined for the image block of 8x2.
Fig. 3 is the schematic diagram 300 for retaining the bit Data other than redundant data for the image block of Fig. 2.
Specific embodiment
In order to make above-mentioned and other purposes of the invention, features and advantages more clear and easy to understand, preferable implementation is especially enumerated
Example, and cooperate attached drawing, it is described in detail as follows.
Figure 1A shows an electronic system, the image processing apparatus including the embodiment of the present invention.In Figure 1A, image procossing dress
It sets 1 and includes a processor (non-icon), to run image processing method of the invention after processor execution program.In addition to this,
The image processing apparatus 1 can further include compression module and decompression module, function be respectively to data carry out compression and
Decompression.The compression module and the decompression module can be made of hardware circuit, or execute corresponding pressure by the processor
Contracting decompresses program and realizes its function.Image processing apparatus 1 is connect through circuit with display buffer 11, and shows driving 12
Wherein one end is connect through circuit with decompression module 1, and the other end then penetrates circuit and connect with display 13.It introduces individually below
The function of each hardware.
Display buffer 11 can obtain original video 10 in an image (Frame) 101 at some time point, and will figure
It keeps in display buffer 11 as 101.As shown in Figure 1B, Figure 1B indicates original video 10 in Figure 1A in different time points
Two images 101,102.It is to be explained using the image of 24 bit colors as example in the present embodiment, therefore display buffer
11 to store number of cells required for a pixel be 24.It is noted that the present embodiment is not limited to 24
The image of first color can also apply the image in other bit colors in the range of hardware circuit may be implemented.
The image 101 being temporarily stored in display buffer 11 will be subsequent with benefit by circuit transmission to image processing apparatus 1
Image processing flow.During the processing of image processing apparatus 1, display buffer 11 can also obtain original image 101 in advance
Video 10 another time point an image 102 and synchronize and be stored in display buffer 11.To image 101 in image procossing
After the process flow of device 1, then image 102 is transferred to image processing apparatus 1, uses 100 whole sections of original video of completion
The image procossing of time.
Then, the image 101 that image processing apparatus 1 comes for the transmission of display buffer 11, according to pre-determined algorithm general
Image 101 is cut into multiple images block 101a.Fig. 1 C indicates the wherein image 101 for being directed to Figure 1B, is by size
The image 101 of 1920x1080 is cut into the schematic diagram that multiple sizes are fixed as the image block 101a of 8x2.Then, image procossing
Device 1 is again as unit of image block, and each pixel is in red, green, the picture of blue three kinds of ingredients in acquirement image block
Element value.
In next explanation, image block size is set as the rectangle of 8x2, therefore an image district by the present embodiment
In block, always meet together comprising 16 pixels.However, the size of image block is not limited in the setting of 8x2 herein, it can basis
Actual application, size and shape to image block carry out any change.In addition, being taken in addition to above-mentioned based on rgb color space
Except the pixel value of red out, green, blue three kinds of ingredients, other color spaces can also be based on, such as: YUV color is empty
Between in brightness (grayscale value), coloration and concentration, and using brightness, coloration and concentration to carry out at subsequent image
Reason.
Image processing apparatus 1 can pass through a processor (non-icon) execute program after to run image processing method of the invention
Method.Firstly, image processing apparatus 1 obtain in image block 101a 16 pixels red, green, the respective pixel value of blue it
Afterwards, each pixel value is expressed as to 2 carry values of 8 bits.In table 1 below, it is illustrated in some block of pixels of image 101
In 101a, 16 pixels (Pixel-01~Pixel-16) respective pixel in red, green, blue three kinds of color components
Value.
Table 1
Then, attached drawing 2 is please referred to arrange in pairs or groups following explanation.Fig. 2 is the signal that redundant data is determined for the image block of 8x2
Figure 200.Fig. 2 only captures the red pixel value of 16 pixels (Pixel-01~Pixel-16) in table 1, and with 2 carry tables
Show.Each pixel value indicates that (high bit to low level member) is respectively designated as the 7th bit, the 6th from left to right with 8 bits
Member, the 5th bit ..., the 1st bit, the 0th bit.The redundant data determination flow of red pixel value is only illustrated in Fig. 2, and it is same
The green of one image block, the representation method of blue pixel value and determination flow are also same.
Then, the pixel value of 2 carries is expressed as 16, image processing apparatus 1 determines 16 positions of every a line line by line
Member value whether identical (all 0 or all 1).If 16 bit values of some bit position are identical, should
Bit position is denoted as " target bit position " defined in the present invention.This process will continue all to complete to be determined as to every a line
Only.It is that 16 bits are determined since the 7th bit with the sequence of (high bit to low level member) from left to right in example below,
Then determine again the 6th bit, the 5th bit ..., until the 0th bit, but when practice, the direction that determines line by line is simultaneously not only limited
In this.
Such as: image processing apparatus 1 determines the 7th bit first, since the value of 16 bits of the 7th bit is 0, implies that
There are redundant datas 0 for 7th bit, and therefore, the 7th bit can be denoted as one " target bit position " by image processing apparatus 1
201, and the judgement result of the 7th bit is denoted as " 0 ".After 7th bit determines, a line is moved from the 7th bit toward the right,
And then image processing apparatus 1 determines whether the value of 16 bits of the 6th bit is identical.And the value of the 6th bit determines knot
Fruit is 1, and implying that the 6th bit, there are redundant datas 1, therefore, image processing apparatus 1 equally by the 6th bit be denoted as another "
Target bit position " 201, and the judgement result of the 6th bit is denoted as " 1 ".
Then, image processing apparatus 1 determines the value of 16 positions of the 5th bit.However 16 bits in the 5th bit
Value is not identical, implies that the 5th bit and there is no redundant datas, therefore image processing apparatus 1 can't be by the 5th bit
It is denoted as target bit position, and the judgement result of the 5th bit is denoted as " x ", then a line of turning right determines the 4th bit ... according to this
Analogize.
As shown in Fig. 2, determining that result is " 01x10xx0 " all 8 bit positions determine totally after.It is total to have 5
A bit position is denoted as target bit position 201, be respectively as follows: the 7th bit, the 6th bit, the 4th bit, the 3rd bit and
0th bit.And the corresponding bit value of above-mentioned 5 target bit positions 201, then it is respectively as follows: 0,1,1,0,0.
It is to be illustrated for the determination flow of red pixel value in same image block above, when red pixel value determines
After, image processing apparatus 1 can sequentially determine green pixel values and blue pixel value, according to identical with red pixel value
Process is determined.However, above-mentioned red → green → blue sequence is only for convenience of description, the embodiment of the present invention and not only
It is limited to this, other than red → green → blue sequence, can also be determined according to arbitrary sequence or three kinds of face
Color is determined simultaneously.
Whereby, according to image processing method provided by the invention, the superfluous of three kinds of colors has been determined to the same image block
Remainder is after, the available respective judgement result of three kinds of colors as shown in Table 2.
Table 2
After obtaining the judgement result such as table 2, image processing apparatus 1 by above-mentioned judgement result using mask field and
Value field is removed to store redundant data.Wherein, mask field is defined as one or more target bit with identical value
Position.If finding one or more target bit position with identical value, which is denoted as 1, remaining
Position be then denoted as 0.
And remove value field and be then defined as bit value corresponding to each target bit position in mask field, it anticipates
That is: bit value corresponding to 1 target position is denoted as in mask field.That is, removing position required for value field
The number of " 1 " is denoted as in first number, as mask field.
For example, for table 2 and compare the illustration of above-mentioned Fig. 2, the judgement result for having been achieved with red pixel value be "
01x1 0xx0 ", therefore being used to be stored as the mask field of redundant data is then " 11011001 ", represents the 7th, 6,4,3,0 position
There are redundant datas for the value of first position, and are used to that be stored as the removing value field of redundant data be then " 01100 ", represent the 7th, 6,
4, the value of 3,0 bit positions is respectively corresponded to 0,1,1,0,0.Due to remove value field sequentially mark the sequence of bit position with
Mask field is identical, as long as obtaining each value for removing value field, image processing apparatus 1 can be found in mask field
Corresponding position.
And so on, it is used to store up since the result of judgement is " 0x11 0xxx " for the green pixel values of table 2
The mask field for saving as redundant data is " 1,011 1000 ", and be then for being stored as the removing value field of redundant data "
0110」。
And so on, it is used to store up since the result of judgement is " 0001xxxx " for the blue pixel value of table 2
The mask field for saving as redundant data is " 1,111 0000 ", and be then for being stored as the removing value field of redundant data "
0001」。
In addition, according to the characteristic of redundant data spatially noted earlier, it has also been discovered that with the redundant digit in space
According to target bit position, most of left one side of something for all concentrating on determining result implies that the position of high bit.Therefore in certain realities
It applies in example, in the case that redundant data all concentrates on high 4 bit, also it is contemplated that only redundant data is stored to high 4 bit, without right
Low 4 bit stores redundant data.In this case, redundant data can also include " mode " (Mode) field, to mark
Show and redundant data whether only is stored to high 4 bit.Wherein, " mode " is 0 to indicate only to store redundant data, and " mould to high 4 bit
Formula " is that 1 expression all stores redundant data to 8 bits.
In addition, in certain embodiments, redundant data can also include " enabling flag " (Enable Flag) field,
Image processing method of the invention whether is enabled to indicate.It is judged as that there are less targets in the image block
When bit position, compression ratio may not be can be improved by implementing image processing method of the invention, in this case, " can will be enabled
Flag " field is set as 0 expression and does not enable；It is judged as that there are more target positions in the image block conversely speaking,
When first position, then " can enabling flag ", field is set as 1 expression enabling image processing method disclosed by the invention." enabling flag "
Setting value can sets itself before performing image processing, or determine have in an image block using a critical value
Whether the target bit position of identical value is more than or equal to the critical value, and decides whether " enabling flag " being set as 1.
In summary illustrate, table 3 below can be indicated according to the judgement of table 2 as a result, redundant data is stored it
One of representation method afterwards.Due to each pixel in an image block, all there is red, green, three kinds of blue
The pixel value of color, therefore each color requires one group of mask field of collocation and removes value field.
Table 3
After the redundant data of each image block 101a is stored as the representation such as table 3 by image processing apparatus 1,
The bit Data other than redundant data can be subjected to traditional compression of images.Attached drawing 3 is please referred to arrange in pairs or groups following theory
Bright, Fig. 3 is the image block for 8x2, after carrying out image processing method as shown in Figure 2, is retained other than redundant data
The schematic diagram 300 of bit Data.In Fig. 3, the bit value in the 7th, 6,4,3,0 bit position is had been cleared by originally,
Only with below Fig. 3 mask field and clearance value field indicate the corresponding redundant data of above-mentioned 5 target bit positions.Cause
This, image processing apparatus 1 only needs to be compressed and compiled for the bit Data in the remaining 5th, 2,1 bit position
Code does not need additionally to be compressed and encoded for the 7th, 6,4,3, the 0 corresponding redundant data of bit position originally.
As shown in figure 3, the bit Data that the 5th, 2,1 bit position amounts to 16x3=48 bit is retained, into
The subsequent compression of row, coding, therefore do not need the bit Data that original 8 bit positions are amounted to 16x8=128 bit
It all compressed, encoded.
In addition, as shown in figure 3, the 7th, 6,4,3,0 bit position amounts to the redundant data of 16x5=80 originally, it is only necessary to
Using the mask field below Fig. 3, removing value field, amounting to 13 positions can complete representation.Therefore, transmission is provided by the present invention
Image processing method, number of cells needed for capable of substantially saving compression, coding, so improve compression ratio.
And in the example of table 1, the data volume for the image block that a size is 8x2 is 16x (8+8+8)=384
Member.Wherein, due to red, green, blue pixel value have respectively 5,4,4 bits be it is completely duplicate, redundant data accounts for
There is 16x (5+4+4)=208 bit, implies that the data other than redundant data occupy 176 bits.Due to the redundancy of 208 bits of script
Data can use the mode of table 3 such as and present, therefore compression module only needs the data to remaining 176 bit to be compressed and compiled
Code, and then the data volume of coding is saved, improve compression quality.In addition, only used 39 bits, energy in table 3
Therefore the compression ratio of image also greatly improved in the size of data for occupying 208 bits in performance initial data.
After the main image processing method of complete image processing apparatus 1 described above, Figure 1A is returned to, is worked as then for Figure 1A
The decompression module of the processor of middle image processing apparatus 1, and display driving 12, display 13 are illustrated.
Decompression module is the algorithm described based on compression module in the present embodiment, is based on its reversed process, will compress
Redundant data and compressed bit Data stored by module, by original image restoration.Firstly, compression module will be superfluous
Remainder is accordingly and compressed bit Data is transmitted to compression module.Compression module receives redundant data and compressed bit number
According to rear, first compressed bit Data is unziped it.Due to the decompression algorithm of decompression module and the pressure of compression module
After compression algorithm is symmetric design, therefore bit Data is decompressed by decompression module, can in certain permissible range,
It is reduced into approximate with initial data and possesses the data of initial data feature.
After decompression module obtains the bit Data after decompression, further according to the redundant data received, redundancy is utilized
The information such as enabling flag, mode, mask field and removing value field inside data, by the position in each target bit position
Corresponding position in member value 8 bits of filling.As shown in figure 3, decompression module can in mask field 0 position
It sets, the bit position that the bit Data after judging decompression should be inserted.In this example, i.e., the the 5th, 2,1 bit position.With
Afterwards, further according to inside redundant data enabling flag, mode, mask field and remove the information such as value field, will be by redundant digit
According to being backfilling into the corresponding position of 8 bits.In this example, the value that the 7th bit of mask field corresponds to is 0, as long as therefore
7th bit is all inserted 0, the initial data of the 7th bit can be restored, and so on.After redundant data and decompression
Bit Data merge after, initial image block can be restored.
It is noted that redundant data is all that will not lose in the treatment process of compression module and decompression module
Really.Only the step of compressed bits data a little distortion for will cause bit Data.Therefore, the present invention can ensure a high position
In the case that member is lossless coding, and maintain certain compression quality.
After each image block is restored by decompression module, display driving 12 is sequentially transmitted to through circuit.Display
Driving 12 mainly controls the displays of each pixel, and according to the image data received, by image data according to presetting
Ratio, brightness ... waits and is shown in display 13.Therefore, compression module and decompression module carry out in the middle according to the present embodiment
Video after image procossing, so that it may be showed through display 13.
It is noted that above-described embodiment is only the principle of the present invention and its effect to be illustrated, and be not intended to limit
The scope of the present invention processed.Those of ordinary skill in the art, can be to reality without prejudice under technical principle and spirit of the invention
Example is applied to modify and change.Therefore, the scope of the present invention, should be subject to the description of following claims.
[symbol description]
1~image processing apparatus
10~original video
11~display buffer
12~display driving
13~display
101,102~image
101a~image block
200~image block
201~target bit position
300~image block
Claims (10)
1. a kind of image processing method, comprising:
An image block is obtained, which has multiple pixels, and each pixel has multiple bits；
Determine each pixel in identical bit position with one or more target bit position of identical value；And
One or more target bit position and its corresponding bit value are stored as redundant data.
2. image processing method as described in claim 1, wherein
The redundant data includes that a mask field is used to store one or more target bit position and a removing value field
To store value corresponding to one or more target bit position.
3. image processing method as described in claim 1, further includes:
One image is divided into multiple blocks, and obtains the image block from the multiple block.
4. image processing method as described in claim 1, further includes:
Bit Data other than one or more target bit position of the pixel each in the image block is compressed.
5. image processing method as claimed in claim 4, further includes:
The compressed bit Data is unziped it；And
Using the bit Data after the redundant data and decompression, to restore the image block.
6. a kind of image processing apparatus, including a compression module, to execute following functions:
An image block is obtained, which has multiple pixels, and each pixel has multiple bits；
Determine each pixel in identical bit position with one or more target bit position of identical value；And
One or more target bit position and its corresponding bit value are stored as redundant data.
7. image processing apparatus as claimed in claim 6, wherein
The redundant data includes that a mask field is used to store one or more target bit position and a removing value field
To store value corresponding to one or more target bit position.
8. image processing apparatus as claimed in claim 6, wherein an image is more divided into multiple blocks by the compression module,
And the image block is obtained from the multiple block.
9. image processing apparatus as claimed in claim 6, wherein the compression module is more by the picture each in the image block
Bit Data other than one or more target bit position of element is compressed.
10. image processing apparatus as claimed in claim 9 further includes a decompression module, to execute following functions:
The compressed bit Data of the compression module is unziped it；And
Using the bit Data after the redundant data and decompression of compression module storage, to restore the image block.
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