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JavaCV - Why does IplImage.createFrom (image) no longer exist?

I am working with JavaCV at the moment to try simple blob detection. I use maven and got JavaCV 0.11 (more specific org.bytedeco.javacv) from my repositories. Everything compiles without errors and works great, but the method of creating an IplImage from BufferedImage seems to not exist. Eclipse says

The method createFrom(BufferedImage) is undefined for the type opencv_core.IplImage

I don’t know what the problem is because everything works fine except for this method.

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1 answer

Cause...

JavaCV 0.11 introduced the concept of FrameConverter .

The goal is not to create unnecessary communication between the application using JavaCV and another API (FFmpeg, Java 2D ...).

Instead, JavaCV uses Frame instances of the class to store audio samples or video image data. These frames can later be shared between different APIs thanks to FrameConverter s.

Read More: JavaCV Frame Converters

Workaround ...

You can always copy and paste the code of the createFrom method into your own code or reorganize it using FrameConverter s.

Below is the (uncompiled) code of a method taken from the source repository:

 public static IplImage createFrom(BufferedImage image) { return createFrom(image, 1.0); } public static IplImage createFrom(BufferedImage image, double gamma) { return createFrom(image, gamma, false); } public static IplImage createFrom(BufferedImage image, double gamma, boolean flipChannels) { if (image == null) { return null; } SampleModel sm = image.getSampleModel(); int depth = 0, numChannels = sm.getNumBands(); switch (image.getType()) { case BufferedImage.TYPE_INT_RGB: case BufferedImage.TYPE_INT_ARGB: case BufferedImage.TYPE_INT_ARGB_PRE: case BufferedImage.TYPE_INT_BGR: depth = IPL_DEPTH_8U; numChannels = 4; break; } if (depth == 0 || numChannels == 0) { switch (sm.getDataType()) { case DataBuffer.TYPE_BYTE: depth = IPL_DEPTH_8U; break; case DataBuffer.TYPE_USHORT: depth = IPL_DEPTH_16U; break; case DataBuffer.TYPE_SHORT: depth = IPL_DEPTH_16S; break; case DataBuffer.TYPE_INT: depth = IPL_DEPTH_32S; break; case DataBuffer.TYPE_FLOAT: depth = IPL_DEPTH_32F; break; case DataBuffer.TYPE_DOUBLE: depth = IPL_DEPTH_64F; break; default: assert false; } } IplImage i = create(image.getWidth(), image.getHeight(), depth, numChannels); i.copyFrom(image, gamma, flipChannels); return i; }

Link: opencv_core.java

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Source: https://habr.com/ru/post/988195/

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