Decode an Android test resource image as an OpenCV Mat

loadOpenCvImage.kt

/**
 * Uses OpenCV to decode an image that is an android test resource i.e.
 * a file from `src/androidTest/resources`.
 * Note that the resulting Mat will be empty if there was a problem loading the file.
 */
private fun loadOpenCvImage(testResourceFilename: String): Mat {
    val bytes: ByteArray = javaClass.classLoader!!.getResource(testResourceFilename).readBytes()
    val matOfByte = MatOfByte().apply { fromList(bytes.toList()) }
    return Imgcodecs.imdecode(matOfByte, CV_LOAD_IMAGE_COLOR)
}