drydart/flutter_opencv

OpenCV bindings plugin for Flutter apps [work in progress]

flutter_opencv's Issues

Create HDR image from multiple variation of an image

@artob
Is your feature request related to a problem? Please describe.
I'd like to create an HDR image from multiple images with different exposure values.

Describe the solution you'd like
I've done it with Objective-C in Native iOS previously.
It would be great if we could do this out of the box with this flutter library as well.
For example, it could be something like this:

List<Image> images = [image1, image2, image3] //At least 3 versions of the same image each one with different exposure values.
List<double> times =  [0.25, 2.5, 5.0] // List of different exposure values of images above.
Image hdrImage = processHDR(images, times);

Kind regards,
Nima

Need short information how to add custom functions

I understand that there are too many OpenCV functions to implement them by one person. Let's do it together. Could you please explain how to add a new OpenCV function to the plugin?

Is this enough to add another

case "getVersionString":
        result.success(org.opencv.core.Core.getVersionString());
        break;

and implement the corresponding Flutter code like this?

Future<String> get versionString async {
  return await _channel.invokeMethod('getVersionString') as String;
}

Anything else? How do we actually load the image and pass the data in parameters so that OpenCV can understand it?

I hope everybody will be able to implement the functions they need and submit PR for you to review and merge.

I'm particularly interested in

• Canny
• Hough Lines

Upgrade org.bytedeco.javacpp-presets:opencv version

The current development contains org.bytedeco.javacpp-presets:opencv:3.4.3-1.4.3: it's old.

We are at the start of the development, can we upgrade to org.bytedeco.javacpp-presets:opencv:4.0.1-1.4.4?

An alternative is to mantain the org.bytedeco.javacpp-presets:opencv:3.4.3-1.4.3 as current version.

Maybe can be useful upgrade now the version to not break compatibility later.

IOs compability

Very cool project. I'd like to use this in an project which I'm working in currently, but it requieres IOs Support.

So you have plans to support that too? What needs to be done for that? Could I help somewhere?

I'm not really fluent in Swift or C++ but that shouldn't stop me from helping!

Um simple example for to load a image...

Hello! I wonder if it's possible to add a simple example of how to load some image using the plugin? I think it will be very useful for novice users to begin from that point. Thanks and regards.