Local amplification method and device for digital textbook

Abstract

The invention discloses a digital textbook local amplification method and device, and the method comprises the steps: obtaining a digital textbook in a PDF format, selecting a to-be-amplified target region from the digital textbook, determining a region coordinate, converting the region coordinate into a PDF page coordinate when an amplification instruction is received, obtaining a PDF region corresponding to the target region, and carrying out the amplification of the target region. And gradually amplifying the PDF area according to a preset amplification amplitude until the amplified area reaches the maximum length and / or the maximum width which can be accommodated by the screen, stopping the amplification operation, and moving the amplified area to the center of the screen. According to the digital textbook, the PDF is adopted as a carrier, amplification of the target area is achieved through amplification of the PDF area corresponding to the target area, the fonts in the digital textbook in the PDF format are vector fonts, and the actual sizes of the vector fonts can be randomly scaled without deformation and blurring, so that the digital textbook is more convenient to use. Therefore, after the target area is amplified, the content in the amplified area can be ensured to be clear, so that teaching and learning are facilitated.

Description

technical field [0001] The invention relates to the technical field of digital teaching, and more specifically, to a method and device for partially enlarging digital teaching materials. Background technique [0002] Digital teaching materials, that is, digital teaching materials. Different from traditional textbooks, digital textbooks use multimedia technology to digitize traditional paper content and transform them into interactive textbooks suitable for various electronic terminals. [0003] In practical application scenarios, users usually need to partially zoom in on digital textbooks to facilitate teaching and learning. However, most digital textbooks use pictures as carriers. When a part of the picture is enlarged, the enlarged content will become blurred and unclear, which will affect the teaching and learning effects. Contents of the invention [0004] In view of this, the present invention discloses a method and device for partial enlargement of digital teachin...

AI Technical Summary

Problems solved by technology

However, most digital textbooks use pictures as carriers. When a part of the picture is enlarged, the enlarged content will become blurred and unclear, which will affect the teaching and learning effect.

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