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Drawn line erasing method and drawn line erasing device

A line drawing and bitmap technology, applied in the field of image processing, can solve the problems of poor user experience, slow line drawing and erasing speed, etc., to avoid display freezes, improve user experience, and improve the effect of erasing speed.

Inactive Publication Date: 2017-06-30
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present application provides a line drawing and erasing method and device to solve the problems of the existing erasing methods, such as slow line drawing and erasing speed, and poor user experience

Method used

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  • Drawn line erasing method and drawn line erasing device
  • Drawn line erasing method and drawn line erasing device
  • Drawn line erasing method and drawn line erasing device

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Embodiment Construction

[0035] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present application as recited in the appended claims.

[0036] The terminology used in this application is for the purpose of describing particular embodiments only, and is not intended to limit the application. As used in this application and the appended claims, the singular forms "a", "the", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term...

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Abstract

The application provides a drawn line erasing method and a drawn line erasing device. The method comprises the following steps: acquiring an erasing area input to a drawn line bitmap of an electronic whiteboard; and setting the attribute of the pixels in the erasing area as transparent to display a background bitmap under the drawn line area, thus erasing drawn lines. According to the application, interface display of the electronic whiteboard is realized through superposed display of the drawn line bitmap and the background bitmap. For erasing, the attribute of the pixels in the erasing area of the electronic whiteboard is directly set as transparent so that the background bitmap under the drawn line area is displayed. There is no need to calculate an intersection area of the erasing area and the drawn line area and modify the pixels in the intersection area in order to update the display interface. An intersection area calculation process is omitted. The erasing speed of drawn lines is increased. The user experience is enhanced.

Description

technical field [0001] The present application relates to the technical field of image processing, and in particular to a method and device for erasing lines. Background technique [0002] With the continuous digitalization and intelligence of teaching media, interactive electronic whiteboards have gradually replaced traditional teaching media. Usually, in the process of using the electronic whiteboard for teaching, the requirements for the erasing speed of the drawn lines on the electronic whiteboard are getting higher and higher. [0003] In the prior art, the erasing area input by the user is collected, and the intersection area between the erasing area and the drawn line is calculated, and then the color value of each pixel in the intersecting area is modified to update the display interface of the electronic whiteboard. In the case of one drawn line, the intersection area between the drawn line and the erased area needs to be calculated once for each drawn line, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/80
CPCG06T11/80
Inventor 李保成王敏张振宝李春华
Owner HISENSE VISUAL TECH CO LTD
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