/**
* Extract metadata from JP2 image file's XML header
*
* @param string $image_filepath Full path to JP2 image file
*
* @return array A subset of the information stored in the jp2 header
*/
public function extractJP2MetaInfo($image_filepath)
{
include_once HV_ROOT_DIR . '/../src/Image/JPEG2000/JP2ImageXMLBox.php';
try {
$xmlBox = new Image_JPEG2000_JP2ImageXMLBox($image_filepath);
$dimensions = $xmlBox->getImageDimensions();
$refPixel = $xmlBox->getRefPixelCoords();
$imageScale = (double) $xmlBox->getImagePlateScale();
$dsun = (double) $xmlBox->getDSun();
$sunCenterOffsetParams = $xmlBox->getSunCenterOffsetParams();
$layeringOrder = $xmlBox->getLayeringOrder();
// Normalize image scale
$imageScale = $imageScale * ($dsun / HV_CONSTANT_AU);
$meta = array("scale" => $imageScale, "width" => (int) $dimensions[0], "height" => (int) $dimensions[1], "refPixelX" => (double) $refPixel[0], "refPixelY" => (double) $refPixel[1], "sunCenterOffsetParams" => $sunCenterOffsetParams, "layeringOrder" => $layeringOrder);
} catch (Exception $e) {
throw new Exception(sprintf("Unable to process XML Header for %s: %s", $image_filepath, $e->getMessage()), 13);
}
return $meta;
}