CN100372355C - Image processing device,image processing method,image creating device,computer software and record medium - Google Patents
Image processing device,image processing method,image creating device,computer software and record medium Download PDFInfo
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Abstract
A halftone output gradation processing section (29) of an image creator (13) has a control part that conducts a halftone processing of input image data by subjecting it to an error diffusion processing, selects input image data on at most one, namely, one or no input image data from the input image data on at least seven colors, namely, primary colors of cyan, magenta, and yellow used as visible colors for creating an image on a recording medium, secondary colors of red, green, and blue that are the complementary colors of the visible colors, and black, and subjects the input image data on the other colors to a different error diffusion processing.
Description
Technical field
Computer software that the present invention relates to a kind of image processing apparatus that in photocopier, printer etc., utilizes the colorant reproduced image of at least seven kinds of colors, image processing system, image processing method, constitutes by image processing program and the recording medium that has write down image processing program, described seven kinds of colors comprise: primary colours green grass or young crops, magenta, Huang; The secondary colour red, green, blue; And black.
Background technology
Correspond respectively in the jet recording device that sprays based on the record image data signal at the ink that has blue or green, pinkish red, yellow these primary colours and black, there is following problem: in the time of 1. will showing the red, green, blue of secondary colour, be difficult to adjust with primary colours, 2. the colour mixture of the boundary between the different colours between the secondary colour is serious, can't obtain the image of high-quality.Therefore have following ink-jet recording apparatus as the device that remedies this problem: have with blue or green, pinkish red, yellow, black, red, green, reach the ink of seven kinds of colors of indigo plant corresponding to the recording head that sprays respectively based on the record image data signal (with reference to patent documentation 1).
According to patent documentation 1 disclosed technology, complicated color treatments need not be carried out and just the modulation of ink itself can be carried out, these secondary colours of red, green, blue utilize red, green, blue ink separately to carry out record respectively, therefore the ink input amount can be reduced, and the generation of permeating between the border of debatable especially different colours in the secondary colour can be suppressed at.
Patent documentation 1: the spy opens flat 8-244254 communique
Summary of the invention
The input image data of colour is implemented halftone process (for example many-valued error diffusion is handled), when on recording materials such as paper, forming image, form average word point, the image of exportable like this colorrendering quality, visual characteristic excellence in overlapping suppressing word point as far as possible as far as possible.
But in patent documentation 1, though disclose according to blue or green, pinkish red, yellow concentration signal and deceived the situation that generation (black generation) is handled and the secondary colour generation is handled, but after be used for spray ink data the generation method, be the method step of many-valuedization processing, produce the too much overlapping pixel of the ink of multiple color, and the very few pixel of quantity of ink in contrast, colorrendering quality is not good.
The object of the present invention is to provide a kind of exportable green grass or young crops, magenta, Huang, black, red, green, and the ink of blue seven kinds of colors can be too much not overlapping, image processing apparatus, image processing system, image processing method, the image processing program of the image of colorrendering quality and visual characteristic excellence, write down the recording medium of image processing program.
Image device among the present invention has by input image data is implemented error diffusion handles the tone rendering handling part that carries out halftone process, wherein, has control part in the tone rendering handling part, this control part is following to be controlled: from the color of carrying out the visual colorant that image forms at recording materials be primary colours, with the secondary colour of the color complementary color counter-rotating of visual colorant, and the input image data of these at least seven kinds of colors of black, select the input image data of maximum a kind of colors, the input image data of other colors is implemented different error diffusion handle.
According to image processing apparatus of the present invention, can generate the output image data that prevents that word point is overlapping.
Image processing apparatus of the present invention has control part, and it selects the input image data with maximum concentration value from the input image data of above-mentioned seven kinds of colors.
According to image processing apparatus of the present invention, in each pixel, the word point of the color that concentration is the highest in exportable seven kinds of colors can limit error accumulation minimum.
Image processing apparatus of the present invention has by input image data is implemented error diffusion handles the tone rendering handling part that carries out halftone process.This tone rendering handling part, to the color of on recording materials, carrying out the visual colorant that image forms be primary colours, with the secondary colour of the color complementary color counter-rotating of visual colorant, and the input image data of these at least seven kinds of colors of black carry out error diffusion when handling, employed threshold value was set to more than peaked 1/2 or 1/2 of the desirable concentration value of input image data during error diffusion was handled.
According to image processing apparatus of the present invention, in the view data of seven kinds of colors of each pixel, the color of output word point mostly is a kind of color most, in other words be a kind of color or below a kind of color, therefore pass through setting threshold, can omit the processing that has peaked color in seven kinds of colors of comparison, output is handled by error diffusion and the color of the view data of output word point, controlledly is made as a kind of color or below a kind of color.
Image processing apparatus of the present invention has by input image data being implemented many-valued error diffusion handles the tone rendering handling part that carries out halftone process, wherein, the tone rendering handling part has control part, this control part is following to be controlled: to the color of carrying out the visual colorant that image forms on recording materials is primary colours, secondary colour with the counter-rotating of the color complementary color of visual colorant, and the input image data of these at least seven kinds of colors of black, in handling, many-valued error diffusion quantizes, the total value of the input image data of at least seven kinds of colors of basis is selected the input image data of maximum a kind of colors from this quantized value, and forcibly selected input image data is operated the diffusion quantization error with a grade.
According to image processing apparatus of the present invention, because following control: the total value of the input image data of at least seven kinds of colors of basis is selected the input image data of maximum a kind of colors in the quantum value that quantizes from many-valued error diffusion is handled, forcibly selected input image data is operated with a grade, the diffusion quantization error therefore exportablely prevented that multiword point from spraying, overlapping view data.And the also exportable view data that prevents very few word point ejection.
Image processing apparatus of the present invention is characterised in that, following control in control part: when the total value of the input image data of at least seven kinds of colors during greater than the value on the grade of total quantization value, select the color of quantization error maximum, forcibly quantized value is improved a grade; When the total value of the input image data of at least seven kinds of colors during less than the value under the grade of total quantization value, select quantization error minimum, the i.e. negative big color of absolute value, a grade forcibly descends quantized value.
According to image processing apparatus of the present invention, when the total value of the input image data of at least seven kinds of colors during, select the color of quantization error maximum greater than the value on the grade of total quantization value, forcibly quantized value is improved a grade; When the total value of the input image data of at least seven kinds of colors during less than the value under the grade of total quantization value, the big color of absolute value of select the quantization error minimum, promptly bearing, a grade forcibly descends quantized value, owing to carried out such control, can the ejection that prevents too much word point, overlapping in, to the comparatively suitable view data of input data output.And, can be when preventing very few word point ejection, to the comparatively suitable view data of input data output.
Image processing system of the present invention has above-mentioned image processing apparatus.
According to the present invention, a kind of image processing system can be provided, owing to can prevent too much word point ejection, overlapping, and the ejection of very few word point, the therefore image of exportable good quality.
Image processing method of the present invention, have by input image data is implemented error diffusion and handle the tone rendering treatment step that carries out halftone process, it is characterized in that: in this tone rendering treatment step, from the color of carrying out the visual colorant that image forms at recording materials be primary colours, with the secondary colour of the color complementary color counter-rotating of visual colorant, and the input image data of these at least seven kinds of colors of black, select the input image data of maximum a kind of colors, the input image data of other colors is implemented different error diffusion handle.
According to image processing apparatus of the present invention, can generate the output image data that prevents that word point is overlapping.
Image processing method of the present invention, have by input image data is implemented error diffusion and handle the tone rendering treatment step that carries out halftone process, it is characterized in that: in this tone rendering treatment step, be primary colours to the color of on recording materials, carrying out the visual colorant that image forms, secondary colour with the counter-rotating of the color complementary color of visual colorant, and the input image data of these at least seven kinds of colors of black carries out error diffusion when handling, and employed threshold value was set to more than peaked 1/2 or 1/2 of the desirable concentration value of input image data during error diffusion was handled.
According to image processing method of the present invention, in the view data of seven kinds of colors of each pixel, because the color of output word point mostly is a kind of color most, therefore pass through setting threshold, can omit the processing that has peaked color in seven kinds of colors of comparison, output is handled by error diffusion and the color of the view data of output word point, controlledly is made as a kind of color or below a kind of color.
Image processing method of the present invention has by input image data being implemented many-valued error diffusion handles the tone rendering treatment step that carries out halftone process.And, it is characterized by: in this tone rendering treatment step, following control: to the color of on recording materials, carrying out the visual colorant that image forms be primary colours, with the secondary colour of the color complementary color counter-rotating of visual colorant, and the input image data of these at least seven kinds of colors of black, in handling, many-valued error diffusion quantizes, the total value of the input image data of at least seven kinds of colors of basis is selected the input image data of maximum a kind of colors from quantized value, and forcibly selected input image data is operated the diffusion quantization error with a grade.
Computer software of the present invention is made of the program that is used to make computer carry out above-mentioned image processing method.
According to the present invention, blue or green when utilizing, pinkish red, yellow these primary colours, these secondary colours of red, green, blue, and the view data of these at least seven kinds of colors of black carry out image when forming, be the too much word point ejection that prevents each color, overlapping, and very few word point ejection, in above-mentioned view data, select maximum a kind of colors, and forcibly quantized value is operated with a grade, as output image data, this image processing method can be got execution by aforementioned calculation is machine-readable.So, can make above-mentioned image processing method be method commonly used.
And, blue or green when utilizing, pinkish red, yellow these primary colours, these secondary colours of red, green, blue, and the view data of these at least seven kinds of colors of black carry out image when forming, for the word point that prevents each color overlapping, in above-mentioned view data, select maximum a kind of colors, in other words select a kind of color or below a kind of color as output image data, this image processing method or select maximum a kind of colors and forcibly quantized value is operated image processing method as view data with a grade from view data can be got execution by aforementioned calculation is machine-readable.So, can make above-mentioned image processing method be method commonly used.
Recording medium of the present invention is stored above-mentioned image processing method, so that computer is carried out.
According to said structure, the program of image processing method can be offered computer like a cork.
Description of drawings
Fig. 1 is the block diagram of the structure of the image processing apparatus that is used to illustrate on the image processing system and had.
Fig. 2 is the structure key diagram of ink-jet recording apparatus.
Fig. 3 is the perspective view of printhead.
Fig. 4 is the key diagram that halftoning output tone is handled.
Fig. 5 is the structure key diagram of halftoning output tone handling part.
Fig. 6 is that halftoning generates the flow chart of handling.
Fig. 7 is the block diagram of error diffusion handling part.
Fig. 8 is the block diagram of the structure of the printer driver that is used to illustrate that computer has.
Fig. 9 is the structure key diagram of halftoning output tone handling part.
Figure 10 is that halftoning generates the flow chart of handling.
Figure 11 is the block diagram of error diffusion handling part.
Embodiment
(embodiment 1)
Fig. 1 is the block diagram of the structure of the image processing apparatus 13 that had in the image processing system 11 of expression digital copier or ink jet type photocopier (compounding machine that also has copy function, facsimile function, printing function).
23 pairs in input tint correction portion has carried out the reflectivity signals enforcement input tint correction processing that shadow correction is handled.It is reflectivity signals to be converted to image processing apparatus 13 easy to handle Signal Processing such as concentration signal that the input tint correction is handled.Input tint correction handling part 23 also can further be implemented color balance to reflectivity signals and handle.
(R: red, G: green, B: concentration signal indigo plant) is converted to CMY (C: green grass or young crops to color correction unit 24 with RGB, M: magenta, Y: concentration signal Huang), and, the concentration signal of CMY is implemented color correction process in order verily to realize the color reproduction in the image output device 15.Color correction process particularly, is that to eliminate the look of spectral characteristic of toner based on the CMY that contains unwanted absorption composition respectively, ink from the concentration signal of CMY turbid.
Image field separating treatment portion 25 carries out regional separating treatment according to the concentration signal from the CMY of color correction unit 24 output.Separating resulting (regional identification signal) in the image field separating treatment portion 25 is provided to black undercolour removal portion 26, the spatial filtering handling part 28 of generating, and also is provided to halftoning output tone handling part 29 sometimes.
The black undercolour removal portion 26 that generates, according to the color signal of formation from the CMY of the concentration signal of color correction unit 24 outputs, the black generation that generates the color signal of black (K) is handled.And the black color signal that generates undercolour removal 26 couples of CMY of portion is implemented undercolour removal and is handled.Undercolour removal is handled, and is to deduct to deceive from the color signal of CMY to generate the color signal of handling the black that is generated and the processing that obtains the color signal of new CMY.The result who carries out these processing is, it is view data that the concentration signal of CMY is converted into the picture signal that the color signal by CMYK constitutes.
Secondary colour generates handling part 27, the color signal of two kinds of colors from three kinds of colors of the black CMY that generates 26 outputs of undercolour removal portion is carried out secondary colour generate and handle.Secondary colour generates to be handled, and generates secondary colour by two kinds of color signals in three kinds of colors of CMY, these two kinds of colors is deducted the color signal of secondary colour.The secondary colour that generates (color of visual colorant is carried out color after the complementary color counter-rotating) is if blue or green and pinkish red combination then be blue, if blue or green and yellow combination then be green, if combination pinkish red and Huang then is red.Specifically tell about following.
Spatial filtering handling part 28 generates the CMYKRGB view data that handling part 27 obtained and implements to have utilized the spatial filter of digital filter to handle the black undercolour removal portion 26, secondary colour of generating.Therefore thus the spatial frequency characteristic of image is proofreaied and correct, can prevent to produce fuzzy or graininess deterioration in the image of image output device 14 outputs.
Halftoning output tone handling part (tone rendering handling part) 29 is implemented tint correction processing and halftoning generation processing to the CMYK view data after the spatial filter processing.Halftoning generate to be handled, thereby is can be the processing that a plurality of pixels are reproduced tones with image segmentation, can use two-value, many-valued high-frequency vibration method, error-diffusion method etc.And halftoning output tone handling part 29, also can carry out the characteristic value that concentration value with view data is converted to image output device 14 is the processing of dot area percentage.
Fig. 2 is the integrally-built perspective oblique view of expression as the inkjet recording device (photocopier, printer, compounding machine) of an example of image output device.
This ink jet type record (image output) device 14 roughly is made of printhead (ink gun) 141, balladeur train 142, transfer roller 143, leading axle 144, holding unit 145, motor 146, rotating band 147 and maintenance unit 148.Balladeur train 142 carries printhead (ink gun) 141, and can relatively move on the main scanning direction of arrow X1 and X2 direction with respect to recording materials P.And, recording materials P, never illustrated paper feed part begins to be transmitted on the sub scanning direction of arrow Y, carries out image by the printhead 141 that moves simultaneously on arrow X1 and X2 direction and forms.The recording materials that paper feed part had are sent page by page by not shown feeding-in roll, and are provided to printhead 141 parts by the transfer roller 143 as the recording materials delivery unit.Record end recording materials P be discharged to row paper portion (not shown).
Above-mentioned printhead (ink gun) 141 is supported on the leading axle 144 and holding unit 145 that extends along above-mentioned main scanning direction slidably, is determined with respect to the position of recording materials.And the rotating band 147 that is driven by the motor 146 as driver element is set up to parallel with leading axle 144, and printhead (ink gun) 141 driven by rotating band 147 and be shifted.In addition, maintenance unit 148 is parts of implementing the maintenances such as cleaning of printhead (ink gun) 141.
And, as shown in Figure 3, the print cartridge 151 that has the general ink of multiple color in the printhead (ink gun) 141, described multiple color for example is seven kinds of colors that are made of C (green grass or young crops), M (magenta), Y (Huang), K (deceiving), R (red), G (green), B (indigo plant).These inks are ejected on the recording medium by nozzle 16 corresponding to view data.
And in the image processing apparatus and image processing method that present embodiment relates to, its structure is: will represent that the two-value data whether halftoning output (reproductions) tone handling part 29 sprays the word point of ink exports by the error diffusion processing.
Describe handle the halftoning output tone processing of carrying out by black generation processing in the present embodiment and undercolour removal with reference to Fig. 4.Fig. 4 is the schematic diagram that basis is deceived the processing example that generates processing and undercolour removal processing carrying out secondary colour generation processing.
The black undercolour removal portion 26 that generates implements black the generation from the color signal of the CMY of the concentration signal of look correction unit 24 outputs and handles and undercolour removal is handled according to constituting.
The related black generation of present embodiment is handled, and directly as the color signal of black, CMY deducts the color signal of black respectively with the minimum value of the color signal (Fig. 4 (a)) of CMY.So, the concentration signal of at least a color becomes 0 in three kinds of colors of CMY.For example, if blue or green color signal is 200, pinkish red color signal is 150, the yellow color signal is 60, then shown in Fig. 4 (b), minimum value 60 is the color signal of black, the color signal of CMY deducts 60 respectively, and blue or green color signal becomes 140, pinkish red color signal becomes 90, yellow signal becomes 0 (Fig. 4 (c)).
Secondary colour generates handling part 27, handles carrying out the secondary colour generation by the color signal that in three kinds of colors of CMY of deceiving 26 outputs of generation undercolour removal portion is not 0.Secondary colour that present embodiment relates to generate handle with color signal in three kinds of colors of CMY be not the minimum value of color signal of two kinds of colors of 0 as the color signal of secondary colour, these two kinds of colors deduct the color signal of secondary colour.So, at least a color becomes 0 in these two kinds of colors.Shown in Fig. 4 (d), blue or green color signal is 140, pinkish red color signal is 90, and minimum value 90 becomes blue signal, and blue or green, pinkish red color signal deducts 90 respectively, and blue or green color signal becomes 50, pinkish red color signal becomes 0 (Fig. 4 e)).
Generating the processing that undercolour removal portion 26, secondary colour generate handling part 27 by black, is not that 0 color signal mostly is a kind of color, a kind of color in the secondary colour and black these the three kinds of colors in three kinds of colors of primary colours most.To the view data of the seven kinds of colors of CMYKRGB after these processing, in spatial filtering handling part 28, carry out spatial filtering and handle.
Further in halftoning output tone handling part 29, carry out tint correction processing and halftoning respectively and generate processing.
Halftoning output tone handling part 29 generates handling part 42 by tint correction handling part 41 and halftoning and constitutes (with reference to Fig. 5).
The processing of tint correction handling part 41 is to be the processing of dot area percentage to each pixel with the output characteristic corresponding characteristics value that the view data of C, M, Y, K is converted to image output device 14.
At this, halftoning is generated handling part 42 be specifically described (error diffusion handling part 43 is with reference to the block diagram of Fig. 7).
Halftoning generates handling part 42 and is made of error diffusion handling part 43 and Cmax judging part 44.Be input to the pixel of the input image data of error diffusion handling part 43, by adder 431 add be stored in error storage part 437 in the relative propagated error of above-mentioned pixel, and it is outputed to quantification treatment portion 432.In quantification treatment portion 432, judge signal according to the concentration of Cmax judging part 44, select to be stored in the quantization threshold in the quantization threshold storage part 433, compare with the pixel that has added propagated error, and carry out binaryzation, try to achieve error with quantized value.And, in diffusion coefficient configuration part 435, select diffusion coefficient from diffusion coefficient storage part 436, go out propagated error according to this diffusion coefficient and above-mentioned Error Calculation.And, this propagated error is stored in the error storage part 437.
In Cmax judging part 44, judge the highest data of concentration in the CMYKRGB view data, for the highest color of concentration, carry out the signal (concentration judgement signal) of binaryzation by common threshold value with propagated error to quantification treatment portion 432 outputs of this color.For other colors, the quantization threshold that output will be stored in the quantization threshold storage part 433 of error diffusion handling part 43 is made as 255 signal (concentration judgement signal).Perhaps 432 outputs of vectorization handling part unconditionally are set at quantized value 0 signal (concentration judgement signal).The threshold value 255 here is the maximum of concentration when image is represented with 256 tones.
Fig. 6 represents that the halftoning that the halftoning of the halftoning output tone handling part 29 that present embodiment relates to generates in the handling part 42 generates the flow process of handling.At this, image output device generates to handle as halftoning and uses the two-value error-diffusion method as whether spraying the word point, promptly forming the device of image with two-value.
At step ST10, in each color component of C, M, Y, K, the cumulative errors that are diffused into processed pixels are added in the view data of input.And, try to achieve the peaked color component in the input image data of addition in step ST11.Threshold value with the color component beyond the maximum in step ST12 is made as 255, each color component and threshold value (255) is compared, and carry out binaryzation, diffusion binarization error (step ST13).
And, also can not search the view data maximum, the maximum of concentration (with the 256 tone presentation videos time)/2=127.5 by 255, making versicolor threshold value is that binaryzation is carried out to shades of colour respectively in 127 (positions after the fractions omitted point).This is because because the total concentration value of three kinds of colors is 255 to the maximum, therefore can not have more than two kinds in three kinds of colors is more than 128 or 128.At this moment, do not need Cmax judging part among Fig. 5, Fig. 7.
By above processing, can not spray the word point of a plurality of colors to a pixel, can suppress the deterioration of colorrendering quality, also can obtain the visual effect preferable image.
In the present invention, also can make the program that to carry out this image processing method, and said procedure is stored in the recording mediums such as hard disk, floppy disk, CD-ROM.According to said structure, can like a cork aforementioned recording medium be provided to image processing system, computer etc., thereby make this image processing system, computer carry out this image processing method.
This program for example also can be used as software application in computer, and also can be with the printer driver setting of having made up said procedure on computers.
Fig. 8 is the block diagram of the structure of the printer driver that has of computer.Computer 50 comprises printer driver 51, communication port driver 56, communication port 57.Printer driver 51 is made of color correction unit 52, tone rendering handling part 53, output converter section 54, printer language Translation Service 55.And computer 50 via communication port drivers 56 such as RS232C, LAN, communication port 57, is connected with ink-jet printer (image output device) 14.
In computer 50,, be sent in the color correction unit 52 in the printer driver 51 by carrying out the view data that various application programs generate.In color correction unit 52, to the identical processing of color correction unit that view data is implemented and above-mentioned color image processing apparatus is had.Further in color correction unit 52, also carry out black generation undercolour removal portion in the color image processing apparatus and secondary colour and generate processing in the handling part.View data by color correction unit 52 outputs then is sent to tone rendering handling part 53, implements tint correction processing, halftoning generation processing.The view data of having carried out handling in tone rendering handling part 53 is sent to output converter section 54.In output converter section 54, according to the arrangement of the head (ink guns such as C, M, Y, K) of printer 14, the conversion output image data and sends it to printer language Translation Service 55, is converted to printer language.View data from 55 outputs of printer language Translation Service is input to printer 14 via communication port driver 56, communication port 57.In printer 14, the view data of input is outputed on the recording materials such as paper.
Program that the present invention relates to and recording medium as mentioned above, can be used as printer driver and append and be set on existing computer and the printer etc.So, can implement image processing method of the present invention like a cork.
(embodiment 2)
Image processing apparatus that present embodiment relates to and image processing method be characterised in that on the halftoning output tone handling part, and its multi-value data of spray volume that will represent the word point of ink is exported by many-valued error diffusion processing.
Tint correction in the present embodiment is handled, and is to be the processing of dot area percentage for each pixel with the output characteristic corresponding characteristics value that the view data of C, M, Y, K is converted to image output device 14.
Halftoning output tone handling part generates handling part 420 by tint correction handling part 410 and halftoning and constitutes (with reference to Fig. 9).
Halftoning generates handling part 420 and is made of error diffusion handling part 430 and quantification total value scope determination portion 440.
Structure according to block diagram illustrations error diffusion handling part 430 shown in Figure 11.
Error diffusion handling part 430, the pixel of input image data to input adds and the relative propagated error of above-mentioned pixel that is stored in error storage part 570 by adder 510, and outputs to quantification treatment portion 520.In quantification treatment portion 520, select to be stored in the ternary quantization threshold (discussing after a while) of quantization threshold storage part 530, compare with the view data of the pixel that has added propagated error, and carry out four values, try to achieve error with quantized value.
In quantized value correction unit (control part) 540, try to achieve the total value of the dateout of the total value of quantized value of each color component or expression word point spray volume, determine that with the total value scope signal compares.The total value scope is determined signal, from quantification total value scope determination portion 440 outputs of the scope of the total value of following definite dateout.
Quantized value correction unit (control part), in the total value of the dateout of the total value of the quantized value of each color component or expression word point spray volume, when being higher than the total value scope and determining the value of the scope shown in the signal, forcibly make the quantized value of color component of the negative absolute value maximum of the quantization error grade that descends, try to achieve quantization error again.
Quantize correction unit (control part) 540, in the total value of the dateout of the total value of the quantized value of each color component or expression word point spray volume, when being lower than the total value scope and determining the value of the scope shown in the signal, forcibly make grade of quantized value decline of the color component of quantization error maximum, try to achieve quantization error again.
And, the total value of the dateout of the total value of the quantized value of each color component or expression word point spray volume, when determining that with the total value scope scope shown in the signal is consistent, do not carry out the correction of quantized value.This is handled after a while and specifically discusses.
And, in diffusion coefficient configuration part 550, from diffusion coefficient storage part 560, select diffusion coefficient, go out propagated error according to this diffusion coefficient and above-mentioned Error Calculation, this propagated error is stored in the error storage part 570.
Quantize total value scope determination portion 440, for preventing with respect to the concentration shown in the input image data, too much word point ejection and overlapping or very few word point ejection, try to achieve the total value of CMYKRGB view data, according to this total value, determine each color component quantized value total value or represent the scope of total value of the dateout of total word point spray volume.In the present embodiment, image output device can be with the word point spray volume of four grades control from nozzle shown in Figure 3 161.That is, be set to, generate to handle as halftoning and use four value error-diffusion methods with many-valued formation image.The quantized value relative with the view data 0,1,2,3 of the spray volume of expression word point is respectively 0,85,170,255.
The signal that is expressed as follows the information of controlling is determined signal output as the total value scope: if the total value of CMYKRGB view data is below 85 or 85, then the total value of the quantized value of each color component is 0 or 85, and the total value of promptly representing the view data of word point spray volume is 0 or 1; If the total value of CMYKRGB view data is 86～170, then the total value of the quantized value of each color component is 85 or 170, and the total value of promptly representing the view data of word point spray volume is 1 or 2; If the total value of CMYKRGB view data is more than 171 or 171, then the total value of the quantized value of each color component is 170 or 255, and the total value of promptly representing the view data of word point spray volume is 2 or 3.
Then, the halftoning that present embodiment is related to reference to the flow chart of Figure 10 generates the flow process of handling and describes.
In being input to each color component of error diffusion handling part 430,, add the propagated error (step ST1) that is stored in the error storage part 570 with adder 510 for each processed pixels.Try to achieve the total value of the input image data of the color component that has added cumulative errors, determine the scope (step ST2) of quantized value (from the output word point amount of nozzle) summation amount.
In step ST3, selection is stored in the ternary quantization threshold (discussing after a while) in the quantization threshold storage part 530, the view data and the quantization threshold that have added the pixel of propagated error are compared, try to achieve quantized value, and try to achieve the error of view data and quantized value.At step ST4, try to achieve the total value of the quantized value (output word point amount) of each color component.
In step ST5, judge whether the total value of quantized value (output word point amount) determines signal greater than the total value scope.If the total value of the dateout of the total value of the quantized value of each color component or expression word point spray volume, determine the value of the scope shown in the signal greater than the total value scope, then advance to step ST7, the grade that forcibly quantized value of the color component of the negative absolute value maximum of quantization error descended is tried to achieve quantization error again.
The total value of the dateout of the total value of the quantized value of each color component or expression word point spray volume, when being not more than the total value scope and determining the value of the scope shown in the signal, advance to step ST6, judge whether the total value of quantized value (output word point amount) determines signal less than the total value scope.If the total value of the dateout of the total value of the quantized value of each color component or expression word point spray volume, determine the value of the scope shown in the signal less than the total value scope, then advance to step ST8, forcibly the quantized value with the color component of the maximum of quantization error improves a grade, tries to achieve quantization error again.If the total value of the dateout of the total value of the quantized value of each color component or expression word point spray volume, be not less than the value that the total value scope is determined the scope shown in the signal, then advance to step ST9, for each color component, store this propagated error into error storage part 570.
At this, be made as 42,127,212 and carry out quantification treatment with being stored in quantization threshold in the quantization threshold storage part 530, determine that according to the total value scope signal carries out the quantized value timing afterwards, as described below.
Added in the view data of pixel of propagated error, if blue or green color signal is 50, pinkish red color signal is 0, the yellow color signal is 0, red color signal is 0, green color signal is 0, blue color signal is 90, the color signal of black is 60, then the total value of CMYKRGB view data is 200, because it surpasses 171, therefore the total value of the quantized value of each color component is 170 or 255, the total value of promptly representing the view data of word point spray volume is 2 or 3, and the total value scope that quantizes total value scope determination portion 440 these information of output expression is determined signal.After implementing quantification treatment, blue or green quantized value is that 85 (word point spray volumes 1), pinkish red quantized value are that 0 (word point spray volume 0), yellow quantized value are that the quantized value of 0 (word point spray volume 0), redness is that the quantized value of 0 (word point spray volume 0), green is that the quantized value of 0 (word point spray volume 0), blueness is that the quantized value of 85 (word point spray volumes 1), black is 85 (word point spray volumes 1).The total value of the quantized value of each color component is 255 (total value of the dateout of expression word point spray volume is 3), enter into the total value scope that quantizes total value scope determination portion 440 and determine the total value scope shown in the signal, therefore in this case, any one color component is not all carried out the correction of quantized value, directly spread quantization error.
Added in the view data of pixel of propagated error, if blue or green color signal is 135, pinkish red color signal is 0, the yellow color signal is 0, red color signal is 0, green color signal is 0, blue color signal is 45, the color signal of black is 60, then the total value of CMYKRGB view data is 240, because it surpasses 171, therefore the total value of the quantized value of each color component is 170 or 255, the total value of promptly representing the view data of word point spray volume is 2 or 3, and the total value scope that quantizes total value scope determination portion 440 these information of output expression is determined signal.After implementing quantification treatment, blue or green quantized value is that 170 (word point spray volumes 2), pinkish red quantized value are that 0 (word point spray volume 0), yellow quantized value are that the quantized value of 0 (word point spray volume 0), redness is that the quantized value of 0 (word point spray volume 0), green is that the quantized value of 0 (word point spray volume 0), blueness is that the quantized value of 85 (word point spray volumes 1), black is 85 (word point spray volumes 1).The total value of the quantized value of each color component is 340 (total value of the dateout of expression word point spray volume is 4), its with determine that as the total value scope of quantum summation value scope determination portion 440 2 or 3 of the total value scope shown in the signal is compared and exceed too much.In this case, to each color component search quantization error negative absolute value maximum be any color.Since blue or green quantization error for-35, pinkish red quantization error is 0, yellow quantization error is 0, red quantization error is 0, green quantization error is 0, blue quantization error for-40, black quantization error is-25, the negative absolute value maximum of therefore blue quantization error, a quantized value grade of decline (word point spray volume deducts 1) of indigo plant is made as 0 (word point spray volume 0), and blue quantizing error becomes 45.Afterwards to each color component diffusion quantization error.
Added in the view data of pixel of propagated error, if blue or green color signal is 0, pinkish red color signal is 30, the yellow color signal is 5, red color signal is 25, green color signal is 0, blue color signal is 0, the color signal of black is 40, then the total value of CMYKRGB view data is 100, be in 86～170 scope, therefore the total value of the quantized value of each color component is 85 or 170, the total value of promptly representing the view data of word point spray volume is 1 or 2, and the total value scope that quantizes total value scope determination portion 440 these information of output expression is determined signal.After implementing quantification treatment, blue or green quantized value is that 0 (word point spray volume 0), pinkish red quantized value are that 0 (word point spray volume 0), yellow quantized value are that the quantized value of 0 (word point spray volume 0), redness is that the quantized value of 0 (word point spray volume 0), green is that the quantized value of 0 (word point spray volume 0), blueness is that the quantized value of 0 (word point spray volume 0), black is 0 (word point spray volume 0).The total value of the quantized value of each color component is 0 (total value of the dateout of expression word point spray volume is 0), and it compares low too many with determine 1 or 2 of the total value scope shown in the signal as the total value scope of quantum summation value scope determination portion 440.What in this case, each color component is searched the quantization error maximum is any color.Because blue or green quantization error is 0, pinkish red quantization error is 30, yellow quantization error is 5, red quantization error is 25, green quantization error is 0, blue quantization error is 0, black quantization error is 40, therefore black quantization error maximum, black quantized value is improved a grade (word point spray volume increases by 1) be made as 85 (word point spray volumes 1), black quantizing error becomes-45.Afterwards to each color component diffusion quantization error.
By above processing, can not produce too much word point ejection and overlapping on the same position, also can prevent very few word point ejection, can suppress the deterioration of colorrendering quality, can obtain the sense of vision preferable image.
In the present invention, also can make the program that to carry out this image processing method, said procedure be stored on the recording mediums such as hard disk, FD, CD-ROM.According to said structure, aforementioned recording medium can be offered image processing system, computer etc. like a cork, make this image processing system, computer carry out this image processing method.
This program for example can be used as software application in computer, and also can be with the printer driver setting that added said procedure on computers.
The printer driver that computer had is as described in the embodiment 1.
Program involved in the present invention and recording medium as mentioned above, can be used as printer driver and append and be set on existing computer and the printer etc.So, can implement image processing method of the present invention like a cork.
And, in the present embodiment, enumerated digital color copier and printer, but also other have the digit apparatus of printing function, copy function and facsimile function as image output device as image output device.
[utilizing on the industry possibility]
According to the present invention, for each pixel, can form green grass or young crops, magenta, Huang, black, red, green, The ink of blue seven kinds of colors can be not overlapping, the image of colorrendering quality, visual effect excellence.
And, according to the present invention, can prevent that too much word point is overlapping, reach opposite word point shortcoming, Thereby can suppress image deterioration.
Claims (4)
1. an image processing apparatus has by input image data is implemented error diffusion and handles the tone rendering handling part that carries out halftone process, it is characterized in that:
Above-mentioned tone rendering handling part has: quantization threshold storage part, storage quantization threshold;
The error storage part, the storage propagated error;
Adder, with the pixel of above-mentioned input image data be stored in above-mentioned error storage part in the relative propagated error addition of above-mentioned pixel;
Control part, this control part is following to be controlled: from the color of carrying out the visual colorant that image forms at recording materials be primary colours, with the secondary colour of the color complementary color counter-rotating of visual colorant, and the input image data of these seven kinds of colors of black, select a kind of input image data of color, the input image data of other colors is implemented different with it error diffusion handle;
The above-mentioned quantization threshold in the above-mentioned quantization threshold storage part according to the signal of above-mentioned control part, is selected to be stored in by quantification treatment portion, compares with the pixel of exporting from above-mentioned adder that has added propagated error, and carries out binaryzation, tries to achieve the error with quantized value; And
Diffusion coefficient is selected from the diffusion coefficient storage part in the diffusion coefficient configuration part, goes out propagated error according to this diffusion coefficient and above-mentioned Error Calculation, and this propagated error is stored in the above-mentioned error storage part.
2. image processing apparatus according to claim 1 is characterized in that: above-mentioned control part, from the input image data of above-mentioned seven kinds of colors, select input image data with maximum concentration value.
3. an image processing system has claim 1 or 2 described image processing apparatus.
4. an image processing method has by input image data is implemented error diffusion and handles the tone rendering treatment step that carries out halftone process, it is characterized in that, may further comprise the steps:
In each color component, the accumulated error that is diffused into processed pixels respectively is added in the view data of above-mentioned input;
From the color of carrying out the visual colorant that image forms at recording materials be primary colours, with the secondary colour of the color complementary color counter-rotating of visual colorant, and the input image data of these seven kinds of colors of black, select a kind of input image data of color, the input image data of other colors is implemented different with it error diffusion handle;
Forcibly the threshold value with the color component beyond above-mentioned a kind of color component is made as 255;
Each color component and threshold value are compared, and carry out binaryzation, the diffusion binarization error.
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| JP2003129376A JP4642326B2 (en) | 2003-05-07 | 2003-05-07 | Image processing apparatus, image processing method, image forming apparatus, computer software, and recording medium |
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| CN101518156B (en) * | 2006-09-27 | 2016-04-20 | 皇家飞利浦电子股份有限公司 | Color selection input device and method |
| JP4840614B2 (en) * | 2008-09-26 | 2011-12-21 | 富士ゼロックス株式会社 | Image processing apparatus and image processing program |
| PL3465628T3 (en) * | 2016-05-24 | 2020-12-14 | E Ink Corporation | Method for rendering color images |
| JP7277231B2 (en) * | 2019-04-15 | 2023-05-18 | キヤノン株式会社 | Image processing device, image processing method and program |
| CN111212212A (en) * | 2020-03-16 | 2020-05-29 | Oppo广东移动通信有限公司 | Camera assembly, mobile terminal and control method |
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| US5402245A (en) * | 1994-01-27 | 1995-03-28 | Hewlett-Packard Company | Bi-level digital color printer system exhibiting improved undercolor removal and error diffusion procedures |
| JPH08244254A (en) * | 1995-03-14 | 1996-09-24 | Canon Inc | Color ink jet recorder |
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| US5949965A (en) * | 1997-06-23 | 1999-09-07 | Hewlett-Packard Company | Correlating cyan and magenta planes for error diffusion halftoning |
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| JP2000287089A (en) * | 1999-03-30 | 2000-10-13 | Matsushita Electric Ind Co Ltd | Image binarizing method |
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| US5402245A (en) * | 1994-01-27 | 1995-03-28 | Hewlett-Packard Company | Bi-level digital color printer system exhibiting improved undercolor removal and error diffusion procedures |
| JPH08244254A (en) * | 1995-03-14 | 1996-09-24 | Canon Inc | Color ink jet recorder |
| JPH1044473A (en) * | 1996-08-05 | 1998-02-17 | Seiko Epson Corp | Ink-jet recording device |
| US5949965A (en) * | 1997-06-23 | 1999-09-07 | Hewlett-Packard Company | Correlating cyan and magenta planes for error diffusion halftoning |
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| JP4642326B2 (en) | 2011-03-02 |
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