USRE42473E1 - Rendering images utilizing adaptive error diffusion - Google Patents
Rendering images utilizing adaptive error diffusion Download PDFInfo
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- USRE42473E1 USRE42473E1 US11/847,894 US84789407A USRE42473E US RE42473 E1 USRE42473 E1 US RE42473E1 US 84789407 A US84789407 A US 84789407A US RE42473 E USRE42473 E US RE42473E
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
- H04N1/4051—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a dispersed dots halftone pattern, the dots having substantially the same size
- H04N1/4052—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a dispersed dots halftone pattern, the dots having substantially the same size by error diffusion, i.e. transferring the binarising error to neighbouring dot decisions
- H04N1/4053—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a dispersed dots halftone pattern, the dots having substantially the same size by error diffusion, i.e. transferring the binarising error to neighbouring dot decisions with threshold modulated relative to input image data or vice versa
Definitions
- the present invention relates to the rendering of digital image data, and in particular, to the binary or multilevel representation of images for printing or display purposes
- ⁇ images constitute an effective means of communicating information
- displaying images should be as convenient as displaying text.
- many display devices such as laser and ink jet printers, print only in a binary fashion.
- some image format standards only allow binary images.
- WAP1.1 Wireless Application Protocol
- WBMP Wireless Application Protocol
- BMP bitmap
- a WBMP image should not be larger than 150 ⁇ 150 pixels.
- Some WAP devices have screens that are very limited in terms of the number of pixels. For example, one WAP device has a screen that is 96 pixels wide by 65 pixels high. In order to render a digitized continuous tone input image using a binary output device, the image has to be converted to a binary image.
- the input digitized continuous tone image is compared, on a pixel by pixel basis, to a threshold taken from a threshold array.
- Many ordered dither digital halftoning methods suffer from low frequency artifacts. Because the human vision system has greater sensitivity at low frequencies (less than 12 cycles/degree), such low frequency artifacts are very noticeable.
- the most frequently used “blue noise method” is the error diffusion method.
- an input digital image I n (the digitized continuous tone input image) is introduced into the system on a pixel by pixel basis, where n represents the input image pixel number.
- Each input pixel has its corresponding error value E n ⁇ 1 , where E n ⁇ 1 is the error value of the previous pixel (n ⁇ 1), added to the input value I n at a summing node, resulting in modified image data.
- the modified image data, the sum of the input value and the error value of the previous pixel (I n +E n ⁇ 1 ), is passed to a threshold comparator.
- the modified image data is compared to the constant threshold value T.
- Eschbach disclosed selectively modifying the threshold level on a pixel by pixel basis in order to increase or decrease the edge enhancement of the output digital image.
- the improvements disclosed by Eschbach do not allow the control of the edge enhancement by controlling the high frequency portion of the error. Also, the improvements disclosed by Eschbach do not introduce parameters that can be selected to produce the image of the highest perceptual quality at a specific output device.
- one aspect of this invention includes an adaptive halftoning method where the difference between a digital image and a filtered digital image is introduced into the system on a pixel by pixel basis; each input difference pixel having a corresponding error value, generated from the previous pixels, added to the input value at a summing node, resulting in modified image difference data; the modified image difference data being passed to a threshold comparator where the modified image difference data is compared to a threshold value, the threshold value varying according to the properties of the digital image, to determine the appropriate output level; the output level is subtracted from the modified image difference value to produce the input to an error filter; the output of the error filter is multiplied by a adaptation coefficient, where the adaptation coefficient varies according to the properties of the digital image, to generate the error level for the subsequent input pixel; and, the cyclical processing of pixels is continued until the end of the input data is reached.
- a histogram modification is performed on the image, and the difference between the histogram modified digital image and the filtered digital image is introduced into the system on a pixel by pixel basis.
- the histogram modification is performed on the difference between the digital image and the filtered digital image and the histogram modified difference is introduced into the system on a pixel by pixel basis.
- the selectively changing of the adaptation coefficient comprises dividing the difference between the value at the pixel and the filtered value at the pixel by the filtered value at the pixel, multiplying the absolute value of the result of the division by a first parameter, and adding a second parameter to the result of the multiplication, thereby obtaining the coefficient.
- the threshold calculation comprises multiplying the filtered value at the pixel by a third parameter.
- the filter is a filter of finite extent
- the extent of the filter the first, second parameters and third parameters are selected to produce the image of the highest perceptual quality at a specific output device.
- the methods, systems and computer readable code of this invention can be used to generate halftone images in order to obtain images of the highest perceptual quality when rendered on displays and printers.
- the methods, systems and computer readable code of this invention can also be used to for the design of computer generated holograms and for the encoding of the continuous tone input data.
- FIG. 1a depicts a block diagram of selected components of an embodiment of a system, of this invention for generating a halftone image from a digitized continuous tone input image, where the histogram modification block is included after the summing node;
- FIG. 1b depicts a block diagram of selected components of an embodiment of a system of this invention for generating a halftone image from a digitized continuous tone input image, where the histogram modification block is included before the summing node;
- FIG. 1c depicts a block diagram of selected components of an embodiment of a system of this invention for generating a halftone image from a digitized continuous tone input image, where the adaptation coefficient multiplies the input to the error filter block;
- FIG. 2 depicts a block diagram of selected components of another embodiment of the system of this invention for generating a halftone image from a digitized continuous tone input image
- FIG. 2a depicts a block diagram of selected components of another embodiment of the system of this invention for generating a halftone image from a digitized continuous tone input image, where the adaptation coefficient multiplies the input to the error filter block.
- FIG. 1a A block diagram of selected components of an embodiment of a system of this invention for generating a halftone image from a digitized continuous tone input image (also referred to as a digital image) is shown in FIG. 1a .
- image input block 10 introduces an input digital image I n into the system on a pixel by pixel basis, where n represents the input image pixel number.
- the input image is also provided to the filtering block 20 .
- the output of filtering block 20 has the form Av n 32 h( . . . ,I k , . . . , I. n , . . . ) (1) where h is a functional form spanning a number of pixels.
- the input digital image 10 can be a two dimensional array of pixel values and that the array can be represented as a linear array by using such approaches as raster representations or serpentine representation.
- the filter 20 will also be a two dimensional array of filter coefficients and can also be represented as a linear array.
- the functional forms will be shown in the one dimensional form for ease of interpretation.
- the calculations can be started N pixels from the boundary in equation (2). In that case the calculated and halftone image are smaller than the input image. In another case, the image is continued at the boundaries, the continuation pixels having the same value as the boundary pixel. It should be apparent that other methods of taking into account the effect of the boundaries can be used.
- the output of the filtering block 20 is subtracted from the input digital image I. n at node 25 , resulting in a difference value, D n .
- D n is the input to a summing node 70 .
- a corresponding error value E n ⁇ 1 is added to the input value D n resulting in a modified image datum.
- the modified image data, D n +E n ⁇ 1 is compared to the output of the threshold calculation block 30 in the threshold comparison block 40 to produce the halftoning output, O n .
- the output level O n is subtracted from the modified image value to produce the input to an error filter block 50 .
- the error filter block 50 allocates its input, D n +E n ⁇ 1 ⁇ O n , to subsequent pixels based upon an appropriate weighting scheme.
- the weighted contributions of the error filter block 50 input are stored and all the contributions to the next input pixel are summed to produce the output of the error filter block 50 , the error value.
- the output of the error filter block 50 is multiplied by the adaptation coefficient in block 60 to generate the error level E. n for the subsequent input pixel.
- the cyclical processing of pixels is continued until the end of the input data is reached.
- the input image is also provided to the threshold calculation block 30 .
- the output of the threshold calculation block 30 has the form t( . . . , I k , . . . , I. n , . . . ) (3) where t is a functional form spanning a number of pixels.
- t is a functional form spanning a number of pixels.
- the form in equation (3) allows the varying of the threshold according to properties of the digital image.
- the output of the threshold calculation block is a linear combination of terms, each term comprising the product of an input image pixel value multiplied by a coefficient. It should be apparent that this embodiment can also be expressed as a function times a parameter.
- the output of the threshold calculation block 30 is the threshold.
- the first pixel value to be processed, I O produces a difference value D O from summing node 25 and produces a value of D O out of summing node 70 (since E ⁇ 1 is equal to 0 ).
- D O is then compared to the threshold producing an output of O O .
- O O is subtracted from D O to produce the input to the error filter 50 .
- the error filter 50 allocates its input, D O ⁇ O O , to subsequent pixels based upon an appropriate weighting scheme which determines how much the current input contributes to each subsequent pixel.
- Various weighting techniques may be used (see, for example, “Digital Halftoning” by Robert Ulichney, MIT Press, Cambridge, Mass. and London, England, 1990, pp.
- the output of error filter 50 is multiplied by a adaptation coefficient 60 .
- the adaptation coefficient 60 is the output of the coefficient calculation block 80 .
- the output of the coefficient calculation block 80 has the form C 1 +C 2 abs ⁇ f( . . . ,I k , . . . , I. n , . . . ,)/g( . . . ,I k , . . . , I. n , . . . ) ⁇ (5)
- f and g are functional forms spanning a number of pixels.
- Equation (5) allows the selective changing, of the coefficient according to the local properties of the digital image.
- C 1 and C 2 and the parameter in the threshold expression can be selected to produce the image of highest perceptual quality at a specific output device.
- the output of the coefficient calculation block 80 has the form C 1 +C 2 ⁇ abs((I. n ⁇ ( ⁇ n ⁇ N n+N I j ⁇ /(2N+1)))/( ⁇ n ⁇ N n+N I j ⁇ /(2N+1)))) ⁇ (6)
- the input of error filter block 50 is multiplied by weighting coefficients and stored. All the contributions from the stored weighted values to the next pixel are summed to produce the out put of the error filter block 50 .
- the output of the error filter block 50 is multiplied by the adaptation coefficient 60 .
- the delay block 65 stores the result of the product of the adaptation coefficient 60 and the output of the error filter block 50 .
- the input to the error filter is distributed according to the filter weights to the next pixel in the processing line and to neighboring pixels in the following line.
- the output of delay block 65 is E n ⁇ 1 and is delayed by one pixel. (When the first pixel is processed, the output of the delay, E O , is added to the subsequent difference, D 1 .)
- the sequence order of error filter block 50 and the adaptation coefficient block 60 can be interchanged with similar results.
- the delay block 65 stores the output of the error filter block.
- I 1 When the next pixel, I 1 , is introduced into the system from the image input block 10 , it produces a difference value D 1 from summing node 25 and produce a value of (D 1 +E O ) out of summing node 70 .
- the above steps repeat for each subsequent pixel in the digital image thereby producing a halftone image, the sequence O O , O 1 , . . . , O n .
- the modification of the threshold level and the adaptation coefficient allows control of the amount of edge enhancement and provides the opportunity to reduce artifacts.
- D n is the input to the histogram modification block 75 and the output of the histogram modification block 75 is the input to the summing node 70 .
- D n is replaced by the output of the histogram modification block 75 .
- histogram modification operates on the entire difference image.
- histogram equalization For a discussion of histogram equalization, a form of histogram modification, see, for example, Digital Image Processing, by R. C. Gonzalez and P. Wintz, Addison-Wesley Publishing Co., 1977, ISBN 0-201-02596-3, pp. 119-126.)
- D n is the difference between the output of the histogram modification block 75 ( FIG. 1b ) and the filtered image. The above description follows if I n is replaced by the output of the histogram modification block.
- the method described above produces improvements of the error diffusion method by utilizing the difference between the digital image and the filtered digital image as input into the system instead of the digital image, by multiplying the .the output of the error filter by the adaptation coefficient, where the adaptation coefficient varies according to the properties of the digital image, and by using a threshold value that varies according to the properties of the digital image to determine the appropriate output level.
- the output of the filtering block 20 , Av n is given by Equation (2).
- the output of the coefficient calculation block 80 depends on the output of the filtering block 20 , Av n , and the difference D n and is given by C 1 +C 2 ⁇ abs((D n ⁇ Av n )/Av n ) ⁇ (8)
- Equation (2) Equation (8) is the same as Equation (6).
- Histogram equalization is included after the summing node 25 .
- the processing of the input image pixels 10 occurs as described in the preceding section.
- N in Equation (2) (the extent of the filter), C O , C 1 , and C 2 (first, second parameters and third parameters) can be selected to produce the image of highest perceptual quality at a specific output device.
- C O the extent of the filter
- C 1 the extent of the filter
- the sequence order of error filter block 50 and the adaptation coefficient block 60 are interchanged.
- the delay block 65 stores the output of the error filter block.
- the embodiments described herein can also be expanded to include composite images, such as color images, where each color component might be treated individually by the algorithm.
- the value of N in Equation (2) (the extent of the filter), C O , C 1 , and C 2 (first, second parameters and third parameters) can be selected to control the color difference at a color transition while minimizing any effects on the brightness at that location.
- Other possible applications of these embodiments include the design of computer generated holograms and the encoding of the continuous tone input data.
- the embodiments described herein are most easily understood for binary output devices, the embodiments described herein can also be expanded to include rendering an output image when the number of gray levels in the image exceeds that of obtainable in the rendering device. It should be apparent how to expand the embodiments described herein to M-ary displays or M-ary rendering devices (see, for example, “Digital Halftoning” by Robert Ulichney, MIT Press, Cambridge, Mass., and London, England, 1990, p. 341).
- the filter 20 can be selected to impart the desired functional behavior of the difference.
- the filter 20 can, for example, be a DC preserving filter.
- the threshold 40 and the adaptation coefficient 60 can also be selected to impart the desired characteristics of the image.
- Equations (4) and (5) are exemplary forms of functional expressions with parameters that can be adjusted.
- Functional expressions for the threshold and the adaptation coefficient where the expressions include parameters that can be adjusted, will satisfy the object of this invention.
- the techniques described above may be implemented, for example, in hardware, software, firmware, or any combination thereof.
- the techniques described above may be implemented in one or more computer programs executing on a programmable computer including a processor, a storage medium readable by the processor (including, for example, volatile and non-volatile memory and/or storage elements), at least one input device, and at least one output device.
- Program code may be applied to data entered using the input device to perform the functions described and to generate output information.
- the output information may be applied to one or more output devices.
- Each computer program within the scope of the claims below may be implemented in any programming language, such as assembly language, machine language, a high-level procedural programming language, or an object-oriented programming language.
- the programming language may be a compiled or interpreted programming language.
- Each computer program may be implemented in a computer program product tangibly embodied in a machine-readable storage device for execution by a computer processor. Method steps of the invention may be performed by a computer processor executing a program tangibly embodied on a computer-readable medium to perform functions of the invention by operating on input and generating output.
- the generation of the halftone image can occur at a location remote from the rendering printer or display.
- the operations performed in software utilize instructions (“code”) that are stored in computer-readable media and store results and intermediate steps in computer-readable media.
- Computer-readable media include, for example, a floppy disk, a flexible disk, hard disk, magnetic tape, or any other magnetic medium, a CDROM, any other optical medium, punch cards, paper tape, any other physical medium with patterns of holes, a RAM, a PROM, and EPROM, a FLASH-EPROM, any other memory chip or cartridge, a carrier wave as described hereinafter, or any other medium from which a computer can read.
- Electrical, electromagnetic or optical signals that carry digital data streams representing various types of information are exemplary forms of carrier waves transporting the information.
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Abstract
Description
Avn32 h( . . . ,Ik, . . . , I.n, . . . ) (1)
where h is a functional form spanning a number of pixels. It should be apparent that the input
Avn={Σn−N n+NIj}/(2N+1) (2)
If the
t( . . . , Ik, . . . , I.n, . . . ) (3)
where t is a functional form spanning a number of pixels. The form in equation (3) allows the varying of the threshold according to properties of the digital image.
t( . . . ,Ik, . . . , I.n, . . . )=C0{Σn−N n+NIj}/(2N+1) (4)
In another embodiment, the output of the threshold calculation block is a linear combination of terms, each term comprising the product of an input image pixel value multiplied by a coefficient. It should be apparent that this embodiment can also be expressed as a function times a parameter.
The output of the
C1+C2abs{f( . . . ,Ik, . . . , I.n, . . . ,)/g( . . . ,Ik, . . . , I.n, . . . )} (5)
where f and g are functional forms spanning a number of pixels. The form of Equation (5) allows the selective changing, of the coefficient according to the local properties of the digital image. C1 and C2 and the parameter in the threshold expression can be selected to produce the image of highest perceptual quality at a specific output device.
C1+C2{abs((I.n−({Σn−N n+NIj}/(2N+1)))/({Σn−N n+NIj}/(2N+1))))} (6)
t( . . . ,Ik, . . . , I.n, . . . )=COAvn (7)
which is the same function as in Equation 4 when the output of the
C1+C2{abs((Dn−Avn)/Avn)} (8)
When the output of the
N=7,
CO=−20,
C1=0.05, and
C2=1.
In another embodiment, shown in
Claims (35)
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DE60235460D1 (en) | 2010-04-08 |
US20020181023A1 (en) | 2002-12-05 |
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JP2008206182A (en) | 2008-09-04 |
WO2002098126A1 (en) | 2002-12-05 |
JP2004529438A (en) | 2004-09-24 |
EP1393544A1 (en) | 2004-03-03 |
EP1393544B1 (en) | 2010-02-24 |
US6937365B2 (en) | 2005-08-30 |
JP4152313B2 (en) | 2008-09-17 |
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