1, 2, rough draft!

Feb 10, 2020#Android #Android Studio #OpenCV20

AI Translation

This post is translated from Chinese into English through AI.View Original

AI-generated summary

The person has been working on an OpenCV app for Android that uses visible light for positioning. While testing contour recognition, they accidentally used a 2D image from their phone as a sample and found that the lines were very clear. This gave them the idea to create an app that can convert images into line drawings. They copied their existing project, made some modifications, and added features such as long-press to save images. After testing and debugging, they successfully created a stable version and uploaded it to their code repository. They also shared some key parts of the code, including saving images, refreshing the media library, and generating random file names. The app runs smoothly on certain Android smartphones, but compatibility with tablets is unknown.

Recently, I have been working on an Android app using OpenCV for visible light positioning. While identifying contours, I accidentally used a QR code image from my phone as a sample for testing and found that the lines were very clear, just like the image below:
Conversion result
Isn't this a line draft? Maybe I can create an app that can convert images into line drafts with just one click. It might come in handy in the future and would be convenient for drawing enthusiasts as well.

So, I made a copy of my project for visible light positioning, changed the package name, logo, and background image, and then redesigned the UI. I also added a feature to save the image by long-pressing it. After various tests and debugging, I successfully created a stable version in just two days. Finally, I released the app and the project on my Gitee repository.

Key parts of the code:#

Save image:#

Refresh media gallery:#

Generate directory and random file name:#

Preview:

Welcome screen

Main screen

Conversion and save

Since I only used the ARM architecture of the OpenCV library, it runs smoothly on both Redmi Note 1 and Xiaomi 6X. Therefore, I believe it supports almost all Android smartphones, but compatibility with Android tablets is still unknown.