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Method, device and equipment for generating saw-free signature picture

A technology of pictures and signature pens, which is applied in the computer field, can solve the problems of fuzzy signature pictures and obvious jaggedness, etc., and achieve the effect of convenient application, simple calculation, and enhanced application range

Pending Publication Date: 2020-06-02
FUJIAN CENTM INFORMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It is commonly used in the industry to generate static pictures in JPG, PNG and other formats based on the signature data based on the interpolation method (inserting dots or rectangles with different thicknesses between the points of the signature track data), and the pictures are synthesized into PDF, but it can be obvious when zooming in on the PDF. See the problem that the signature picture is blurred and jagged

Method used

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  • Method, device and equipment for generating saw-free signature picture
  • Method, device and equipment for generating saw-free signature picture
  • Method, device and equipment for generating saw-free signature picture

Examples

Experimental program
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Embodiment 1

[0036] This embodiment provides a method, such as figure 1 Shown, comprise; First aspect, the present invention provides a kind of method, comprising:

[0037] Step 1. Collect the position and pressure value of each point of the signature pen from pressing to lifting;

[0038] Step 2. Only keep the point with the highest pressure value for the repeated points, and then calculate each point based on its forward direction to calculate the vertical line segment of the point. The line segment is centered on this point. value to get the length; the points at both ends of the vertical line segment are track points;

[0039] Step 3. Based on the forward direction on the trajectory point, extend a line segment with a set length, and the two endpoints of the line segment are control points;

[0040] Step 4. Use the calculated control points as the control points of the cubic Bezier curve, connect the trajectory points to form a closed curve, and fill it.

[0041] Step 5. Record the ...

Embodiment 2

[0044] In this embodiment, a device is provided, such as figure 2 shown, including:

[0045] The collection module collects the position and pressure value of each point of the signature pen from pressing to lifting;

[0046] The trajectory point module only needs to keep the point with the largest pressure value for the repeated points, and then calculates each point based on its forward direction to calculate the vertical line segment of the point. The line segment is centered on this point. The length of the vertical line segment is based on the set rules. The length is obtained from the pressure value; the points at both ends of the vertical line segment are the track points;

[0047] The control point module extends a line segment of a set length based on the forward direction on the trajectory point, and the two endpoints of the line segment are control points;

[0048] The filling module uses the calculated control points as the control points of the cubic Bezier cur...

Embodiment 3

[0053] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and operable on the processor. When the processor executes the computer program, any implementation manner in Embodiment 1 can be implemented.

[0054]Since the electronic device introduced in this embodiment is the device used to implement the method in Embodiment 1 of this application, based on the method described in Embodiment 1 of this application, those skilled in the art can understand the electronic device of this embodiment. Specific implementation methods and various variations thereof, so how the electronic device implements the method in the embodiment of the present application will not be described in detail here. As long as a person skilled in the art implements the equipment used by the method in the embodiment of the present application, it all belongs to the protection scope of the present application.

[0055] The present inventi...

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Abstract

The invention provides a method, a device and equipment for generating a saw-free signature picture. The method comprises the following steps: step 1, collecting a position and a pressure value of each point between pressing and lifting of a sign pen; step 2, calculating a vertical line segment of each point on the strokes based on the advancing direction, taking the point as the center of the line segment, and obtaining the length of the vertical line segment through a pressure value according to a set rule; points at two ends of the vertical line segment are track points; 3, extending a linesegment with a set length on the track point based on the advancing direction, and taking two end points of the line segment as control points; and step 4, taking the calculated control points as control points of a cubic Bezier curve, connecting the track points to form a closed curve, filling the closed curve, and performing edge tracing generation and edge smoothing to achieve a good anti-aliasing characteristic and a good display effect.

Description

technical field [0001] The invention relates to the field of computer technology, in particular to a method, device and equipment for generating a sawless signature picture. Background technique [0002] Electronic signature is an important technology in the paperless industry, and its core is to replace traditional paper signature with on-screen signature. [0003] The main device for signing on the screen consists of an electromagnetic pen and an electromagnetic screen. This device can collect the position of the electromagnetic pen when it draws a line on the screen and the pressure value of the pen on the screen in real time. Recording these data can be used as proof that the user has signed. However, these data do not have visibility, especially on electronic certificates (such as PDF certificates) that need to display the effect of user signatures to simulate the situation of paper signatures. [0004] It is commonly used in the industry to generate static pictures i...

Claims

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Application Information

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IPC IPC(8): G06T11/20
CPCG06T11/203
Inventor 李亚青段琼张登峰
Owner FUJIAN CENTM INFORMATION
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