Skip to main content

OpenCV native plugin for Unity in IOS

In one of my recent projects, I needed to use OpenCV from within Unity, in IOS. The asset called OpenCVForUnity is overkill because I didn't need the whole OpenCV library, just a few functions. In addition, this asset does not implement the whole OpenCV library so unless you know that what you need is included you may find it lacking when you discover it does not support some functions you need. As my project involves some trial and error and mixing algorithms together I decided to go with a native plugin.

Overview

In IOS, a native library is built as a bundle. We need to put this bundle inside Unity's Plugins/OSX folder to use it. Therefore, we need to create two projects.
  1. An XCode project to build the native plugin.
  2. A Unity project to use the plugin.

Dependencies

Of course, since we need to use OpenCV we will have to install it first. Tutorials on installing OpenCV on IOS are abundant and I will not include them here. Assuming you have installed OpenCV go to the next step.

The Bundle from XCode

First we create a new XCode project.
Select File -> New Project and choose Bundle template.
After setting up the project settings, OpenCV install paths and other parameters, create a new file for the image processing methods. The XCode project that I created can be found here. Inside are some computer vision algorithms that I needed on some of my projects.

The Unity part

Since I needed to use the OpenCV methods in Unity, I implemented it as a native plugin callable from Unity. The Unity project can be found here.

You can clone both repositories and play with the parameters and methods to suit your project. Please let me know in the comments or in the github page if you have any problems.

Comments

  1. wppostscheduleritMarch 2, 2021 at 3:22 AM

    This comment has been removed by a blog administrator.

    ReplyDelete
  2. Alia parkerNovember 14, 2021 at 6:20 AM

    This comment has been removed by a blog administrator.

    ReplyDelete

Post a Comment

Popular posts from this blog

Installing a custom ROM on Android (on the GT-N8013)

It's been a while since my last entry and since it is a new start in 2019, I thought I'd write something about "gone with the old and in with the new". I've had my Samsung Galaxy Note 10.1 (pnotewifi) since 2014, and it's one of the early Galaxy Note tablet series. It has served me well all this years but now it just sits there collecting dust. My old Samsung GT-N8013 I've known a long time about custom Android ROMs like CyanogenMod but has never had the motivation to try them out, until now ! Overview of the process For beginners like me, I didn't have an understanding of the installation process and so it looked complicated and it was one of the reasons I was put off in trying the custom ROM. I just want to say, it's not complicated at all!   Basically you will need to Prepare an SD card and install Android SDK (you need adb ). Install a custom boot loader ( TWRP is the de facto tool at the moment). Use adb to copy custom...
15 comments
Read more

Pitfalls during Training and Object Detection with TensorFlow for Absolute Beginners

This article is based on the great tutorial here on how to train and detect custom objects with Tensorflow. I also referred to the official documentations here and  here  for running Tensorflow model building locally. It was my first custom detection project and I faced some hiccups along the way and this article is to log and share my finding so it can help other beginners like me. In the end, I managed to train a tensorflow model to detect Batsumaru , a character from Sanrio. This is how the detection will look like. The tools Windows 10 Pro 64 Tensorflow originally 1.7.1 and upgraded to 1.12.0. I will share the reason later. Python 3.5.4 LabelImg for image labeling PyCharm IDE Steps and Pitfalls Some of the mistakes I made and other discoveries when following the guide. I will not repeat the steps mentioned in the original guide, but only the parts where I had to deviate from the walkthrough and found out things by myself. The training and...
1 comment
Read more

Unity Best Practices for Beginners

Unity is a fabulous tool for not only games but also interactive entertainment, simulations, etc. And there are many good tutorials on tips and tricks to optimize performance and code readability. I compiled this list as a memo to myself when starting out on Unity, so I can always refer back to the basics and hoping that this can help someone else too. Object pooling. Object pooling is a pretty cool trick and it improves performance because you can reduce the number of Initiate() and Destroy() calls. To illustrate why Destroy can be bad, I attached a screenshot of a project I was building with Unity. I'm not going to go into the details of Object Pooling because there are already many good tutorials out there. One of them being this one.  One thing to always keep in mind is that it is easy to get MissingReferenceException if you accidentally Destroy() the pooled objects. It happened to me once where I attached one script to multiple prefabs which behave the same except that so...
Post a Comment
Read more