Grayscale printing method of thermal printer

A thermal printer and grayscale technology, applied in the temperature recording method, etc., can solve problems such as inaccurate empirical formulas, unsatisfactory grayscale printing effects, etc., and achieve the effect of fine details

Pending Publication Date: 2022-04-05

上海商米科技集团股份有限公司

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AI-Extracted Technical Summary

Problems solved by technology

However, since the heating time of the heating point is not in an ideal linear relationship with the generated temperature, the empirical formula used to calculate the heating time is not accurate when a point is heated multiple times; moreover, the chemical heat layer of thermal paper appears The color density and t...

Abstract

The invention relates to a gray printing method of a thermal printer, which comprises the following steps of: dividing the gray value m of each pixel of a point row by 23, then decomposing according to a binary mode, and heating a certain point for at most 3 times. The grayscale image obtained by adopting the grayscale printing method disclosed by the invention is finer in details and closer to the effect of an original image.

Application Domain

Thermography

Technology Topic

PhysicsEngineering +3

Image

Examples

Experimental program(1)

Example Embodiment

[0038] Example 1

[0039] The number of fever required for the gradation value of 0 to 255 in the prior art and the proportional coefficient of each time the heat transfer time are shown in Table 1 below:

[0040] Table 1

[0041]

[0042]

[0043]

[0044]

[0045]

[0046]

[0047]

[0048] In the present invention, the number of heat generated and the proportional coefficient of the heat generation time required by the gradation value 0 to 31, as shown in Table 2 below:

[0049] Table 2

[0050]

[0051]In the process of printing the grayscale pattern, a gray scale is assumed Figure one There are 8 pixels, and their grayscale values are shown in Table 3.

[0052] table 3

[0053] Pixel sequence number 0 1 2 3 4 5 6 7 grayscale value 45 166 95 107 159 0 73 255

[0054] According to the following steps, this line is 5-order grayscale printing:

[0055] Remove the grayscale value of each pixel of a line in 2 3 , Then decompose according to the binary method shown in Table 4:

[0056] Table 4

[0057] Pixel sequence number grayscale value Gray value removed by 8 X 4

[0058] X 4 The point (pixel in Table 2 is 1, 4, 7) is generated, and the heat generation time is T / 31 * 16.

[0059] X 3 The point of 1 is 1 (pixels in Table 2), and pixels of 2, 3, 6, 7) are generated, and the heat generation time is T / 31 * 8.

[0060] The same point is the same as the grayscale value, respectively, separately:

[0061] (1) The point (serial number 6) having a low grayscale value is 1 (serial number 6), and the heat generation time is T / 31 * 1;

[0062] (2) Treatment of a point (sequence number 2, 4) having a low grayscale value of 3 bits (sequence number 2, 4), the heat generation time is T / 31 * 3;

[0063] (3) Treatment of a point (serial number 1) having a low grayscale value of 3 (serial number 1), the heat generation time is T / 31 * 4;

[0064] (4) The point (sequence 0, 3) having a low grayscale value is 5 (serial number 0, 3), and the heat generation time is T / 31 * 5;

[0065] (5) A point (serial number 7) having a low grayscale value is 7 (serial number 7), and the heat generation time is T / 31 * 7.

[0066] The heat transfer time of each point is as follows:

[0067] table 5

[0068]

[0069]

[0070] Where t is a normal printing of a black fever.

[0071] Picture printing effect obtained using the prior art method and the image printing effect obtained using the method of the present invention, respectively figure 1 , figure 2 Indicated.

[0072] Use the prior art 8th-order grayscale printing method. In the present embodiment, the number of fever times of each point is not more than 3 times, and the gradation information can be more accurately reduced.

PUM

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