Generation method and apparatus for threshold matrix
A threshold matrix, matrix technology, applied in the direction of image communication, electrical components, etc., can solve problems such as restricted use
Inactive Publication Date: 2009-08-12
PEKING UNIV FOUNDER GRP CO LTD +1
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Problems solved by technology
[0008] All in all, although the frequency modulation hanging network plate-making technology based on the error diffusion technology is better than the amplitude modulation hanging network plate-making technology in terms of image reproduction details, but because of the above-mentioned shortcomings of the frequency modulation hanging network plate-making technology, its use is limited, and it needs to be further improved and perfected
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[0071] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0072] The embodiment of the present invention provides a method for generating a threshold matrix, such as figure 2 As shown, the flow chart of the steps of the method is as follows:
[0073] Step 201, in the current color plane, select an undyed element for coloring according to the coloring probability of each element, and record the coloring order of the element;
[0074] Step 202, according to the position parameter of the element: use the element value of the first filter matrix to determine the polymerization degree of the dyed element in each color plane, update the coloring probability of the undyed element in the current color plane; The element value of the second filter matrix of tone frequency modulation dot overlap rate updates the dyeing probability of undyed elements of other color planes;
[0075] Step 203, according to the above st...
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The invention discloses a method for generating threshold matrixes, which comprises the following steps: in the current color surface, selecting an undyed element to perform dyeing according to the dyeing probability of each element, and recording the dyeing order of the element; according to the position parameter of the element, updating the dyeing probability of the undyed element in the current color surface by using the element value of a first filter matrix determining the polymerization degree of dyed elements in each color surface; updating the dyeing probability of the undyed elements of other color surfaces by using the element value of a second filter matrix determining the halftone frequency modulation mesh point coincidence rate of a plurality of color surfaces; traversing all the color surfaces in turn according to the steps until a new dyed element is added on all the color surfaces; and circularly traversing all the color surfaces according to the step of increasing the new dyed element on all the color surfaces until all the elements of all the color surfaces are dyed, and generating the threshold matrix of each color surface according to the dyeing order and the position parameters of all the elements of each color surface. The invention also discloses a device for generating the threshold matrixes.
Description
technical field [0001] The invention relates to the technical field of image hard copy reproduction, in particular to a method and device for generating a threshold matrix. Background technique [0002] 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, namely AM hanging net plate-making technology and FM hanging net plate-making technology. Amplitude modulation hanging screen plate-making technology is also known as the 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 a cluster of dyeing points. Areas, these stained areas are called dots. In the amplitude modulation hanging screen pla...
Claims
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IPC IPC(8): H04N1/405
Inventor 马世雄李海峰王立东
Owner PEKING UNIV FOUNDER GRP CO LTD