CN102098416A - Frequency modulation and amplitude modulation network control method and device - Google Patents

Abstract

The embodiment of the present invention discloses a method and device for controlling an FM and AM network. The method for controlling an FM and AM network includes: generating a first filter matrix and a second filter matrix; Probability matrix and whitening probability matrix; according to the dyeing matrix, blackening probability matrix and the first filter matrix, select the pixels to be blackened, and blacken the pixels; according to the once-updated dyeing matrix , the whitening probability matrix and the second filter matrix, select the pixels to be whitened, and dye the pixels white; judge whether all the pixels are dyed, if there are still pixels that have not been dyed, then repeat the above pairing The steps of pixel coloring. The invention is suitable for controlling the amplitude modulation characteristics of frequency modulation dots in printing plate making equipment.

Description

FM and AM network control method and device

technical field

The invention relates to the technical field of hanging net plate making, in particular to a control method and device for a frequency modulation and amplitude modulation net.

Background technique

The hard copy reproduction of images mainly involves the hanging screen plate-making technology of printers and high-end printing plate-making equipment, which is also called digital image halftone technology. Hanging net plate-making technology can be divided into two categories: AM hanging net plate-making technology and frequency modulation hanging net plate-making technology. Amplitude modulation hanging screen plate-making technology is also known as gathering point orderly dithering technology, which is characterized in that the dyeing points of the generated halftone image are gathered together in pairs adjacent to each other in geometric positions, forming clusters of clusters of dyeing areas. These stained areas are called dots. In the amplitude modulation hanging screen plate making technology, the grayscale reproduction of the original image is controlled by controlling the dot area, and the controlled dots are called amplitude modulation dots.

Different from the AM hanging screen plate-making technology, in the process of generating halftone images with the FM hanging screen plate-making technology, try to avoid the accumulation of dyeing points in geometric positions. The FM hanging screen plate-making technology realizes the grayscale reproduction of the original image by controlling the number of dyeing points per unit area. The dyeing points in the halftone image generated by the frequency modulation hanging net plate-making technology are distributed in a non-aggregated form. The average distance between the corresponding dyeing points is different for different original gray levels. From the perspective of digital image processing, The frequency of the images is varied. The dyeing points generated by the frequency modulation hanging net plate making technology are called frequency modulation network points.

For AM dots, if the accuracy of the output physical equipment, ink adhesion, and the adsorption of the printing carrier are not up to the requirements, the image reproduction effect of the FM dots will be far behind the AM dots; and the FM dots are limited by the dot size. , it is easy to lose points in the highlight area, and it is easy to paste in the dark area, and the layer loss is serious.

FM and AM hybrid screening technology adds AM characteristics to the traditional FM dots, so that the dot size of FM dots also changes with the change of layers, ensuring that the FM dots also have enough ink to transfer to the substrate. There are many ways to realize FM and AM mixed screening. Currently, the commonly used FM and AM screening technology adopts a symmetrical design scheme for high light and dark tone, that is, the amplitude modulation characteristics of the high light area and dark tone area (dot size, and the change rule of dot size) )exactly the same.

In the process of realizing the present invention, the inventor finds that there are at least the following problems in the prior art:

For the vast majority of output devices, the severity of the blur in the dark area is different from that of the missing dots in the highlight area. With a symmetrical design scheme for highlight and dark areas, the amplitude modulation characteristics of the highlight area and the dark area are exactly the same, which cannot meet the requirements. actual output requirements.

Contents of the invention

Embodiments of the present invention provide a method and device for controlling an FM network, which can differentiate the AM characteristics of FM network points in highlight areas and dark areas, and meet actual output requirements.

The technical scheme that the embodiment of the present invention adopts is:

A method for controlling an FM and AM network, comprising:

generating a first filter matrix and a second filter matrix;

Initialize the dyeing matrix, threshold matrix, threshold, blackening probability matrix and whitening probability matrix;

According to the coloring matrix, the blackening probability matrix and the first filter matrix, select pixels to be blackened, and blacken the pixels;

According to the once-updated dyeing matrix, whitening probability matrix, and second filter matrix, select pixels to be dyed white, and dye the pixels white;

It is judged whether all the pixels are dyed, and if there are still pixels not dyed, repeat the above steps of dyeing the pixels.

A frequency modulation amplitude modulation network control device, comprising:

A generating module, configured to generate a first filter matrix and a second filter matrix;

The initialization module is used to initialize the dyeing matrix, the threshold matrix, the blackening probability matrix and the whitening probability matrix;

A blackening module, configured to select pixels to be blackened according to the coloring matrix, the blackening probability matrix and the first filter matrix, and to blacken the pixels;

A whitening module, configured to select pixels to be whitened according to the once-updated dyeing matrix, whitening probability matrix, and second filter matrix, and to whiten the pixels;

The judging module is used for judging whether all the pixels are dyed.

In the embodiment of the present invention, the method and device for controlling the frequency modulation and amplitude modulation network firstly generate the first filter matrix and the second filter matrix, and initialize the dyeing matrix, threshold value matrix, threshold value, black dyeing probability matrix and white dyeing probability matrix, according to the dyeing Matrix, blacking probability matrix and first filter matrix, select the pixels to be blackened, and blacken the pixels, according to the once-updated dyeing matrix, whitening probability matrix and the second filter matrix, Select the pixels to be dyed white, dye the pixels white, and repeat the above dyeing process until all the pixels are dyed. Compared with the prior art, the present invention adopts a double-filter mechanism, divides the threshold matrix into two sections before and after, and uses different filters respectively, so that the amplitude modulation characteristics of the FM dots in the highlight part and the dark part are different, so that Can meet the needs of different output devices.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the flowchart of the method for controlling the FM and AM network provided by Embodiment 1 of the present invention;

Fig. 2 is the flowchart of the method for controlling the FM and AM network provided by the second embodiment of the present invention;

FIG. 3a is a schematic diagram of a filter matrix F _hlack provided in Embodiment 2 of the present invention;

FIG. 3b is a schematic diagram of a filter matrix F _white provided by Embodiment 2 of the present invention;

FIG. 4 is a schematic diagram of an initialized dyeing matrix B provided in Embodiment 2 of the present invention;

FIG. 5 is a schematic diagram of an initialization threshold matrix T provided by Embodiment 2 of the present invention;

FIG. 6a is a schematic diagram of an initialization blackening probability matrix M _black provided by Embodiment 2 of the present invention;

Fig. 6b is a schematic diagram of the initialized whitening probability matrix M _white provided by Embodiment 2 of the present invention;

FIG. 7a is a schematic diagram of an updated dyeing matrix B provided in Embodiment 2 of the present invention;

FIG. 7b is a schematic diagram of an updated threshold matrix T provided by Embodiment 2 of the present invention;

FIG. 7c is a schematic diagram of an updated blackening probability matrix M _black provided by Embodiment 2 of the present invention;

Fig. 8a is a schematic diagram of an updated dyeing matrix B provided in Embodiment 2 of the present invention;

FIG. 8b is a schematic diagram of an updated threshold matrix T provided in Embodiment 2 of the present invention;

Fig. 8c is a schematic diagram of the re-updated whitening probability matrix M _white provided by Embodiment 2 of the present invention;

FIG. 9 is a schematic diagram of the superimposition of the dyeing probability matrix and the filter matrix provided by Embodiment 2 of the present invention;

FIG. 10 is a schematic diagram of the final threshold matrix T provided by Embodiment 2 of the present invention;

FIG. 11a is a schematic diagram of the final threshold matrix T provided by Embodiment 3 of the present invention;

Fig. 11b is a schematic diagram of a binary matrix with a gray value of 20 provided by Embodiment 3 of the present invention;

Fig. 11c is a schematic diagram of a binary matrix with a gray value of 235 provided by Embodiment 3 of the present invention;

Fig. 12 is a schematic structural diagram of an FM and AM network control device provided in Embodiment 4 of the present invention;

Fig. 13 is a schematic structural diagram of an FM and AM network control device provided in Embodiment 5 of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In order to make the advantages of the technical solution of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

Embodiment one

This embodiment provides a method for controlling an FM and AM network. As shown in FIG. 1 , the method for controlling an FM and AM network includes:

101. Generate a first filter matrix and a second filter matrix;

102. Initialize the dyeing matrix, threshold matrix, threshold, black-staining probability matrix, and white-staining probability matrix;

103. According to the coloring matrix, the blackening probability matrix, and the first filter matrix, select pixels to be blackened, and blacken the pixels;

104. According to the once-updated dyeing matrix, whitening probability matrix, and second filter matrix, select pixels to be whitened, and whiten the pixels;

105. Determine whether all the pixels are dyed, if there are still pixels not dyed, repeat steps 103-104, otherwise end.

In the embodiment of the present invention, the frequency modulation and amplitude modulation network control method first generates the first filter matrix and the second filter matrix, and initializes the dyeing matrix, the threshold value matrix, the threshold value, the black dyeing probability matrix and the white dyeing probability matrix, according to the dyeing matrix, blackening probability matrix and the first filter matrix, select the pixels to be blackened, and blacken the pixels, and select the pixel points to be blackened according to the once-updated dyeing matrix, whitening probability matrix and the second filter matrix. To dye the pixels white, dye the pixels white, and repeat the above dyeing process until all the pixels are dyed. Compared with the prior art, the present invention adopts a double-filter mechanism, divides the threshold matrix into two sections before and after, and uses different filters respectively, so that the amplitude modulation characteristics of the FM dots in the highlight part and the dark part are different, so that Can meet the needs of different output devices.

Embodiment two

As shown in Figure 2, the control method of the FM and AM network includes:

201. Generate two filter matrices F _black and F _white , wherein both filter matrices are W×H, and the first filter matrix F _black is a filter matrix generating elements according to formula (1):

${\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; black</span>}}<span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; y</span>}<span\; class="notranslate">\; ]</span><span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\sqrt{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; W</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; the\; y</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

The second filter matrix F _white is a filter matrix generating elements according to formula (2):

${\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; white</span>}}<span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; y</span>}<span\; class="notranslate">\; ]</span><span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\sqrt{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; W</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; the\; y</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Among them, W is the threshold matrix width, H is the threshold matrix height, x ∈ [1, W], y ∈ [1, H];

In the present embodiment, the threshold matrix width W=9, the threshold matrix height H=9, the filter function _f1 is as shown in formula (3), and the filter function _f2 is as shown in formula (4):

${\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\left\{\begin{array}{c}\mathrm{<span\; class="notranslate">\; 0.1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; 1.2</span>}\\ \mathrm{<span\; class="notranslate">\; 0.2,1.2</span>}<span\; class="notranslate">\; <</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; 1.5</span>}\\ \frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="t"\; filenames="H2009102424303E00092.png"\; state="\{\{state\}\}">t</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; ></span>\mathrm{<span\; class="notranslate">\; 1.5</span>}\end{array}\right.<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\left\{\begin{array}{c}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 0.01</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; 1.5</span>}\\ \frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="t"\; filenames="H2009102424303E00092.png"\; state="\{\{state\}\}">t</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; ></span>\mathrm{<span\; class="notranslate">\; 1.5</span>}\end{array}\right.<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

Therefore, the generated first filter matrix F _black is shown in Fig. 3a, and the generated second filter matrix F _white is shown in Fig. 3b.

202. Initialize the dyeing matrix B, specifically: B[x, y]=0, set all pixels to an undyed state; where, B[x, y]=0 means that the pixel [x, y] is not dyed, B[x, y]=-1 represents that the pixel [x, y] is dyed black, and B[x, y]=1 represents that the pixel [x, y] is dyed white;

Initialize the threshold matrix T, specifically: T[x, y]=0, set all elements in the threshold matrix to 0;

Among them, x∈[1, W], y∈[1, H], and they are all integers;

Initialize the threshold Threshold, specifically: Threshold=1;

Therefore, the initialized dyeing matrix B is shown in FIG. 4 , and the initialized threshold matrix T is shown in FIG. 5 .

203. Initialize the blackening probability matrix M _black , specifically: M _black [x, y] = 0.0; wherein, M _black [x, y] is the probability of pixel [x, y] being blackened, and M _black [x, y]=0.0 means that the probability of all pixels being blackened is the same;

Initialize the whitening probability matrix M _white , specifically: M _white [x, y] = 0.0; where, M _white [x, y] is the probability that the pixel [x, y] is dyed white, and M _white [x, y] ＝0.0 means that the probability of all pixels being dyed white is the same;

Among them, x∈[1, W], y∈[1, H], and they are all integers;

Therefore, the initialized black-dyeing probability matrix M _black is shown in FIG. 6 a , and the initialized white-dyeing probability matrix M _white is shown in FIG. 6 b .

204. Find the minimum value and its corresponding pixel coordinates [M_black, n_black] in the blackening probability matrix M _black , and the processing method is as follows:

Find the pixel coordinates [m_black, n_black] so that B[m_black, n_black]=0, and M _black [m_black, n_black]=min{M _black }, then [m_black, n_black] is the next pixel to be blackened ;

Since the initialized M _black [x, y] = 0.0, that is, the probability of all pixels being blackened is the same, therefore, the pixel coordinates [m_black, n_black] = [5, 4] are randomly selected in the first cycle , then the pixel point [5, 4] is the next point to be blackened.

205. Blacken the pixels whose coordinates are [m_black, n_black]=[5, 4], the specific implementation method is: make B[m_black, n_black]=-1, because [m_black, n_black]=[5, 4] , therefore, B[5,4]=-1, thus, the updated dyeing matrix B is shown in Figure 7a;

Assign a value to the threshold matrix T, specifically: T[m_black, n_black]=Threshold, that is, assign the element whose coordinates are [m_black, n_black] to Threshold in the threshold matrix T, because [m_black, n_black]=[5,4 ], and Threshold=1, therefore, T[5,4]=Threshold=1, thus, the updated threshold matrix T is as shown in Figure 7b;

Assign a value to the blackening probability matrix M _black , specifically: M _black [m_black, n_black] = ∞, so that the pixel point [m_black, n_black] will not be selected in the subsequent cycle, because [m_black, n_black] = [ 5, 4], therefore, M _black [5, 4] = ∞.

的元素对应，对于更新后的M_black来说，矩阵中的元素[x′，y′]具如下对应关系： $x^{\&prime;}=(m\_\mathrm{black}+x-\frac{W}{2})\mathrm{mod}W,$ $y^{\&prime;}=(n\_\mathrm{black}+y-\frac{H}{2})\mathrm{mod}H;$ 206. As shown in Figure 9, superimpose M _black and F _black , and translate F _black so that the coordinates of the element in M _black with [m_black, n_black] and the coordinates in F _black are

Corresponding to the elements of , for the updated M _black , the elements [x′, y′] in the matrix have the following correspondence: $x^{\&prime;}=(m\_\mathrm{black}+x-\frac{W}{2})\mathrm{mod}W,$ ${\mathrm{the\; y}}^{\&prime;}=(\mathrm{no}\_\mathrm{black}+\mathrm{the\; y}-\frac{h}{2})\mathrm{mod}h;$

After wrapping according to the method shown in Figure 8, the matrix elements corresponding to M _black and F _black are added, the specific method is: M _black [x′, y′]=M _black [x′, y′]+F _black [ x, y], thus, in the first cycle, when the pixel point [5, 4] is blackened, the updated blackening probability matrix M _black is obtained as shown in Fig. 7c.

207. Find the minimum value and its corresponding pixel coordinates [m_white, n_white] in the whitening probability matrix M _white , and the processing method is as follows:

Find the pixel coordinates [m_white, n_white], so that B[m_white, n_white] = 0, and M _white [m_white, n_white] = min{M _white }, then [m_white, n_white] is the next pixel to be dyed white ;

Since the initialized M _white [x, y] = 0.0, that is, the probability of all pixels being dyed white is the same, therefore, the pixel coordinates [m_white, n_white] = [4, 6] are randomly selected in the first cycle , then the pixel point [4, 6] is the next point to be dyed white.

208. Color the pixels with pixel coordinates [m_white, n_white]=[4,6] white, the specific implementation method is: make B[m_white, n_white]=1, because [m_white, n_white]=[4,6], Therefore, B[4,6]=1, and thus, the updated dyeing matrix B is shown in Figure 8a;

Assign a value to the threshold matrix T, specifically: T[m_white, n_white]=W*H-Threshold+1, that is, assign the element whose coordinates are [m_white, n_white] in the threshold matrix T to W*H-Threshold+1 , since [m_white, n_white]=[4,6], and W=9, H=9, Threshold=1, therefore, T[4,6]=W*H-Threshold+1=81, thus, update again The final threshold matrix T is shown in Figure 8b;

Assign a value to the whitening probability matrix M _white , specifically: M _white [m_white, n_white] = ∞, so that the pixel point [m_white, n_white] will not be selected in the subsequent cycle, because [m_white, n_white] = [ 4, 6], therefore, M _white [4, 6] = ∞.

的元素对应，对于更新后的M_white来说，矩阵中的元素[x′，y′]具有如下对应关系： $x^{\&prime;}=(m\_\mathrm{white}+x-\frac{W}{2})\mathrm{mod}W,$ $y^{\&prime;}=(n\_\mathrm{white}+y-\frac{H}{2})\mathrm{mod}H;$ 209. As shown in Figure 9, superimpose M _white and F _white , and translate F _white , so that the coordinates of the element in M _white with [m_white, n_white] and the coordinates in F _white are

Corresponding to the elements of , for the updated M _white , the elements [x′, y′] in the matrix have the following correspondence: $x^{\&prime;}=(m\_\mathrm{white}+x-\frac{W}{2})\mathrm{mod}W,$ ${\mathrm{the\; y}}^{\&prime;}=(\mathrm{no}\_\mathrm{white}+\mathrm{the\; y}-\frac{h}{2})\mathrm{mod}h;$

After wrapping according to the method shown in Figure 8, the matrix elements corresponding to M _white and F _white are added, and the specific method is: M _white [x′, y′]=M _white [x′, y′]+F _white [ x, y], thus, in the first cycle, when the pixel point [4, 6] is dyed white, the updated whitening probability matrix M _white is obtained as shown in FIG. 8c.

210. The threshold value Threshold is automatically increased by 1, specifically: Threshold=Threshold+1, so after the first cycle ends, Threshold=2.

211. Judging whether there are still elements in the dyeing matrix B that are 0, if there are still elements in the dyeing matrix B that are 0, it indicates that there are still pixels that have not been dyed; if there are no elements in the dyeing matrix B that are 0 , all pixels are colored;

When there are still elements in the coloring matrix B that are 0, repeat steps 204-210 until all pixels are dyed white or black, that is: for all x∈[1, W], y∈ [1, H], when B[x, y]=-1 or B[x, y]=1, the loop ends, and the final threshold matrix T is obtained as shown in FIG. 10 .

In the embodiment of the present invention, the frequency modulation and amplitude modulation network control method first generates the first filter matrix and the second filter matrix, and initializes the dyeing matrix, the threshold value matrix, the threshold value, the black dyeing probability matrix and the white dyeing probability matrix, according to the dyeing matrix, blackening probability matrix and the first filter matrix, select the pixels to be blackened, and blacken the pixels, and select the pixel points to be blackened according to the once-updated dyeing matrix, whitening probability matrix and the second filter matrix. To dye the pixels white, dye the pixels white, and repeat the above dyeing process until all the pixels are dyed. Compared with the prior art, the present invention adopts a double-filter mechanism, divides the threshold matrix into two sections before and after, and uses different filters respectively, so that the amplitude modulation characteristics of the FM dots in the highlight part and the dark part are different, so that Can meet the needs of different output devices.

Embodiment Three

This embodiment provides a control method for an FM and AM network. For the implementation process of the FM and AM network control method, reference may be made to Embodiment 2; the difference from Embodiment 2 is that in this embodiment, the threshold matrix width W=64, Threshold matrix height H=64. The final threshold matrix is obtained as shown in Figure 11a. The graphical representation method adopted by the threshold matrix, in the threshold matrix, the darker the grayscale, the smaller the element value, and the lighter the grayscale, the element The larger the value.

Correspondingly, a binary matrix with a grayscale value of 20 is shown in Figure 11b, and a binary matrix with a grayscale value of 235 is shown in Figure 11c;

Wherein, the method for obtaining the binary matrix whose gray value is 20 is: for each element in the threshold matrix, if the element is greater than 20, then output 255, otherwise output 0;

Similarly, the method for obtaining the binary matrix with a grayscale value of 235 is: for each element in the threshold value matrix, if the element is greater than 235, then output 255; otherwise, output 0.

It can be seen from Fig. 11a, Fig. 11b and Fig. 11c that the size of AM dots in the highlight area and the dark tone area are obviously different, which can meet the actual output requirements.

Embodiment Four

This embodiment provides a control device for an FM and AM network. As shown in FIG. 12 , the control device for an FM and AM network includes:

A generating module 121, configured to generate a first filter matrix and a second filter matrix;

The initialization module 122 is used to initialize the dyeing matrix, the threshold value matrix, the black dyeing probability matrix and the white dyeing probability matrix;

A blackening module 123, configured to select pixels to be blackened according to the coloring matrix, the blackening probability matrix and the first filter matrix, and to blacken the pixels;

The whitening module 124 is configured to select pixels to be whitened according to the once-updated dyeing matrix, the whitening probability matrix, and the second filter matrix, and to whiten the pixels;

Judging module 125, for judging whether all pixels are dyed;

Specifically, the judging module 125 judges whether there are elements in the dyeing matrix that are 0, and if there are elements that are 0 in the dyeing matrix, it indicates that there are still pixels that have not been dyed; if there are no elements in the dyeing matrix that are If the element is 0, then all the pixels are dyed; when there are elements in the dyeing matrix B that are 0, the blackening module 123 selects the pixel to be blackened, and the pixel is dyed black, and The whitening module 124 selects the pixels to be whitened, and whitens the pixels.

In the embodiment of the present invention, the frequency modulation and amplitude modulation network control device first generates the first filter matrix and the second filter matrix, and initializes the dyeing matrix, the threshold value matrix, the threshold value, the black dyeing probability matrix and the white dyeing probability matrix, according to the dyeing matrix, blackening probability matrix and the first filter matrix, select the pixels to be blackened, and blacken the pixels, and select the pixel points to be blackened according to the once-updated dyeing matrix, whitening probability matrix and the second filter matrix. To dye the pixels white, dye the pixels white, and repeat the above dyeing process until all the pixels are dyed. Compared with the prior art, the present invention adopts a double-filter mechanism, divides the threshold matrix into two sections before and after, and uses different filters respectively, so that the amplitude modulation characteristics of the FM dots in the highlight part and the dark part are different, so that Can meet the needs of different output devices.

Embodiment five

As shown in Figure 13, the FM and AM network control device includes:

A generating module 131, configured to generate a first filter matrix and a second filter matrix;

The initialization module 132 is used to initialize the dyeing matrix, the threshold value matrix, the black dyeing probability matrix and the white dyeing probability matrix;

A blackening module 133, configured to select pixels to be blackened according to the coloring matrix, the blackening probability matrix and the first filter matrix, and to blacken the pixels;

A whitening module 134, configured to select pixels to be whitened according to the once-updated dyeing matrix, whitening probability matrix, and second filter matrix, and to whiten the pixels;

Judging module 135, for judging whether all pixels are dyed;

Specifically, the judging module 135 judges whether there are elements in the dyeing matrix that are 0, and if there are elements in the dyeing matrix that are 0, it indicates that there are still pixels that have not been dyed; if there is no element in the dyeing matrix If the element is 0, then all the pixels are dyed; when there are elements in the dyeing matrix B that are 0, the blackening module 133 selects the pixel to be blackened, and the pixel is dyed black, and The whitening module 134 selects pixels to be whitened, and whitens the pixels.

Wherein, the initialization module 132 includes:

The first initialization unit 1321 is configured to set all the elements in the dyeing matrix B to 0, wherein the element in the dyeing matrix B being 0 indicates that the pixel is in an undyed state;

The second initialization unit 1322 is configured to set all elements in the threshold matrix T to 0;

The third initialization unit 1323 is configured to set the threshold Threshold to 1;

The fourth initialization unit 1324 is configured to set all elements in the blackening probability matrix M _black to 0.0;

The fifth initialization unit 1325 is configured to set all elements in the whitening probability matrix M _white to 0.0.

Wherein, the blackening module 133 includes:

The first selection unit 1331 is configured to select an undyed pixel with the smallest blackening probability according to the dyeing matrix B and the blackening probability matrix M _black ;

A blackening unit 1332, configured to blacken the pixels, and obtain the once-updated dyeing matrix B and threshold matrix T;

The first acquiring unit 1333 is configured to acquire a blackening probability matrix M _black after one update according to the blackening probability matrix M _black and the first filter matrix F _black .

Wherein, the whitening module 134 includes:

The second selection unit 1341 is configured to select an undyed pixel with the smallest whitening probability according to the once-updated dyeing matrix B and the whitening probability matrix M _white ;

a whitening unit 1342, configured to whiten the pixels, and obtain the updated dyeing matrix B and threshold matrix T;

The second acquiring unit 1343 is configured to acquire a re-updated whitening probability matrix M _{white according to the whitening probability matrix M white} and the second filter matrix F _{white ;}

A threshold self-incrementing unit 1344, configured to self-increment the threshold Threshold by 1.

In the embodiment of the present invention, the frequency modulation and amplitude modulation network control device first generates the first filter matrix and the second filter matrix, and initializes the dyeing matrix, the threshold value matrix, the threshold value, the black dyeing probability matrix and the white dyeing probability matrix, according to the dyeing matrix, blackening probability matrix and the first filter matrix, select the pixels to be blackened, and blacken the pixels, according to the once-updated dyeing matrix, whitening probability matrix and the second filter matrix, select the pixels to be blackened To dye the pixels white, dye the pixels white, and repeat the above dyeing process until all the pixels are dyed. Compared with the prior art, the present invention adopts a dual-filter mechanism, divides the threshold matrix into two sections before and after, and uses different filters respectively, so that the amplitude modulation characteristics of the FM dots in the highlight part and the dark part are different, so that Can meet the needs of different output devices.

The FM and AM network control device provided in the embodiment of the present invention can realize the method embodiment provided above. The method and device for controlling the FM and AM network provided by the embodiments of the present invention can be applied to printers and high-end printing plate-making equipment, but is not limited thereto.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in a computer-readable storage medium. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM), etc.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. A frequency modulation amplitude modulation network control method, is characterized in that, comprises: generating a first filter matrix and a second filter matrix; Initialize the dyeing matrix, threshold matrix, threshold, blackening probability matrix and whitening probability matrix; According to the dyeing matrix, the blackening probability matrix and the first filter matrix, select the pixels to be blackened, and dye the pixels black; According to the once-updated dyeing matrix, whitening probability matrix, and second filter matrix, select pixels to be dyed white, and dye the pixels white; It is judged whether all the pixels are dyed, and if there are still pixels not dyed, repeat the above steps of dyeing the pixels. 2. the frequency modulation amplitude modulation network control method according to claim 1, is characterized in that, described first filter matrix F _black is the filter matrix that generates element by following formula: ${\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; black</span>}}<span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; y</span>}<span\; class="notranslate">\; ]</span><span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\sqrt{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; W</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; the\; y</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span>$ The second filter matrix F _white is a filter matrix generating elements according to the following formula: ${\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; white</span>}}<span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; y</span>}<span\; class="notranslate">\; ]</span><span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\sqrt{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; W</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; the\; y</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span>$ in, $f_1\left(t\right)=\left\{\begin{array}{c}{d}_{11},t\&le;p_{11}\\ d_{12},p_{11}<t\&le;p_{12}\\ ...\\ \frac{1}{t^2},t>p_{1\mathrm{no}}\end{array}\right.,$ $f_2\left(t\right)=\left\{\begin{array}{c}{d}_{\mathrm{twenty\; one}},t\&le;p_{\mathrm{twenty\; one}}\\ d_{\mathrm{twenty\; two}},p_{\mathrm{twenty\; one}}<t\&le;p_{\mathrm{twenty\; two}}\\ ...\\ \frac{1}{t^2},t>p_{2\mathrm{no}}\end{array}\right.;$ x∈[1, W], y∈[1, H]; W is the threshold matrix width, H is the threshold matrix height; d ₁₁ , d ₁₂ ..., p ₁₁ , p ₁₂ ..., p _1n and d ₂₁ , d ₂₂ ..., p ₂₁ , p ₂₂ ..., p _2n are variable coefficients. 3. the frequency modulation and amplitude modulation network control method according to claim 2, is characterized in that, described initialization dyeing matrix, threshold value matrix, dyeing black probability matrix and dyeing white probability matrix comprise: All the elements in the dyeing matrix B are set to 0, wherein the elements in the dyeing matrix B are 0 to indicate that the pixel is in an undyed state; Set all elements in the threshold matrix T to 0; Set the threshold Threshold to 1; Set all elements in the blackening probability matrix M _black to 0.0; Set all elements in the whitening probability matrix M _white to 0.0. 4. The FM and AM network control method according to claim 3, characterized in that, according to the dyeing matrix, the blackening probability matrix and the first filter matrix, select the pixel to be dyed black, and the pixel Dot black includes: According to the dyeing matrix B and the blackening probability matrix M _black , select undyed pixels with the smallest blackening probability; Dye the pixels black, and obtain the dyeing matrix B and the threshold matrix T after an update; According to the blackening probability matrix M _black and the first filter matrix F _black , the blackening probability matrix M _black after one update is obtained. 5. The FM and AM network control method according to claim 4, characterized in that, according to the dyeing matrix, the whitening probability matrix and the second filter matrix after an update, the pixels to be dyed white are selected , coloring the pixels white includes: According to the once-updated dyeing matrix B and the whitening probability matrix M _white , select undyed pixels with the smallest whitening probability; Dye the pixels white, and obtain the re-updated dyeing matrix B and threshold value matrix T; According to the whitening probability matrix M _white and the second filter matrix F _white , obtain the whitening probability matrix M _white after re-updating; The threshold Threshold is incremented by 1. 6. the frequency modulation amplitude modulation network control method according to claim 5, is characterized in that, whether described judgment all pixels are all dyed comprises: Judging whether there are elements that are 0 in the dyeing matrix B; If there are elements in the dyeing matrix B that are 0, there are still pixels that have not been dyed; If no element in the dyeing matrix B is 0, all pixels are dyed. 7. A frequency modulation and amplitude modulation network control device, characterized in that it comprises: A generating module, configured to generate a first filter matrix and a second filter matrix; The initialization module is used to initialize the dyeing matrix, the threshold matrix, the blackening probability matrix and the whitening probability matrix; A blackening module, configured to select pixels to be blackened according to the coloring matrix, the blackening probability matrix and the first filter matrix, and to blacken the pixels; A whitening module, configured to select pixels to be whitened according to the once-updated dyeing matrix, whitening probability matrix, and second filter matrix, and to whiten the pixels; The judging module is used for judging whether all the pixels are colored. 8. The FM and AM network control device according to claim 7, wherein the initialization module comprises: The first initialization unit is configured to set all the elements in the dyeing matrix B to 0, wherein the element in the dyeing matrix B being 0 indicates that the pixel is in an undyed state; The second initialization unit is used to set all elements in the threshold matrix T to 0; The third initialization unit is used to set the threshold Threshold to 1; The fourth initialization unit is used to set all elements in the blackening probability matrix M _black to 0.0; The fifth initialization unit is configured to set all elements in the whitening probability matrix M _white to 0.0. 9. The FM and AM network control device according to claim 8, wherein the blackening module comprises: The first selection unit is used to select undyed pixels with the smallest blackening probability according to the dyeing matrix B and the blackening probability matrix M _balck ; a blackening unit, configured to blacken the pixels, and obtain the once-updated dyeing matrix B and threshold matrix T; The first acquiring unit is configured to acquire a blackening probability matrix M _{black after one update according to the blackening probability matrix M black and} the first filter matrix F _black . 10. The FM and AM network control device according to claim 9, wherein the white dyeing module comprises: The second selection unit is configured to select an undyed pixel with the smallest whitening probability according to the once-updated dyeing matrix B and the whitening probability matrix M _white ; a whitening unit, configured to whiten the pixels, and obtain a reupdated dyeing matrix B and a threshold matrix T; The second acquisition unit is configured to acquire the updated whitening probability matrix M _white according to the whitening probability matrix M _white and the second filter matrix F _white ; A threshold self-incrementing unit, configured to self-increment the threshold Threshold by 1.

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