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Frequency modulation and amplitude modulation network control method and device
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A technology of frequency modulation, amplitude modulation and control method, which is applied in the direction of image communication, electrical components, etc., and can solve problems such as the inability to meet output requirements
Active Publication Date: 2011-06-15
NEW FOUNDER HLDG DEV LLC +1
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[0007] 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 needs
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Embodiment 1
[0048] This embodiment provides a control method for FM and AM networks, such as figure 1 As shown, the FM and AM network control method includes:
[0049] 101. Generate a first filter matrix and a second filter matrix;
[0050] 102. Initialize the dyeing matrix, threshold matrix, threshold, black-staining probability matrix, and white-staining probability matrix;
[0051] 103. According to the coloring matrix, the blackening probability matrix, and the first filter matrix, select pixels to be blackened, and blacken the pixels;
[0052] 104. According to the once-updated dyeing matrix, whitening probability matrix, and second filter matrix, select pixels to be whitened, and whiten the pixels;
[0053] 105. Determine whether all the pixels are dyed, if there are still pixels not dyed, repeat steps 103-104, otherwise end.
[0054]In the embodiment of the present invention, the frequency modulation and amplitude modulation network control method first generates the first filte...
Embodiment 2
[0056] Such as figure 2 As shown, the FM and AM network control method includes:
[0057] 201. Generate two filter matrices F black and F white , where both filter matrices are W×H, and the first filter matrix F black is the filter matrix that generates elements according to formula (1):
[0058] F black [ x , y ] = f 1 ( ( x - W 2 ) 2 + ( y - H 2 ) 2 ) - - - ( 1 )
...
Embodiment 3
[0096] 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. Get the final threshold matrix as Figure 11a As shown, the graphical representation method adopted by the threshold value matrix, in the threshold value matrix, where the gray scale is darker, the element value is smaller, and where the gray scale is lighter, the element value is larger.
[0097] Correspondingly, a binary matrix with a gray value of 20 such as Figure 11b As shown, the binary matrix with a gray value of 235 is as Figure 11c shown;
[0098] 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;
[0099] Similarly, t...
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Abstract
The embodiment of the invention discloses a frequency modulation and amplitude modulationnetwork control method and a frequency modulation and amplitude modulationnetwork control device. The frequency modulation and amplitude modulationnetwork control method comprises the following steps of: generating a first filter matrix and a second filter matrix; initializing a dyeing matrix, a threshold matrix, a threshold, a black dyeing probability matrix and a white dyeing probability matrix; selecting pixel points to be dyed black according to the dyeing matrix, the black dyeing probability matrix and the first filter matrix; dyeing the pixel points black; selecting the pixel points to be dyed white according to the dyeing matrix updated once, the white dyeing probability matrix and the second filter matrix; dyeing the pixel points white; judging whether all pixel points are dyed; and if undyed pixel points exist, repeating the step of dyeing the pixel points. The method and the device are suitable to be used for controlling amplitude modulation characteristics of frequency modulation mesh points in printing plate making equipment.
Description
technical field [0001] 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 [0002] The hard copyreproduction of images mainly involves the hanging screen plate making technology of printers and high-end printing plate making equipment, which is also called digital imagehalftone 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 amp...
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