public void AplyWhiteBalance(string imagePath, string outImagePath)
{
using (Dataset image = Gdal.Open(imagePath, Access.GA_ReadOnly)) {
Band redBand = GdalUtilities.GetBand(image, ColorInterp.GCI_RedBand);
Band greenBand = GdalUtilities.GetBand(image, ColorInterp.GCI_GreenBand);
Band blueBand = GdalUtilities.GetBand(image, ColorInterp.GCI_BlueBand);
if (redBand == null || greenBand == null || blueBand == null)
{
throw new NullReferenceException("One or more bands are not available.");
}
int width = redBand.XSize;
int height = redBand.YSize;
using (Dataset outImage = Gdal.GetDriverByName("GTiff").Create(outImagePath, width, height, 3, DataType.GDT_Byte, null)) {
double[] geoTransformerData = new double[6];
image.GetGeoTransform(geoTransformerData);
outImage.SetGeoTransform(geoTransformerData);
outImage.SetProjection(image.GetProjection());
Band outRedBand = GdalUtilities.GetBand(outImage, ColorInterp.GCI_RedBand);
Band outGreenBand = GdalUtilities.GetBand(outImage, ColorInterp.GCI_GreenBand);
Band outBlueBand = GdalUtilities.GetBand(outImage, ColorInterp.GCI_BlueBand);
int[] red = new int[width * height];
int[] green = new int[width * height];
int[] blue = new int[width * height];
redBand.ReadRaster(0, 0, width, height, red, width, height, 0, 0);
greenBand.ReadRaster(0, 0, width, height, green, width, height, 0, 0);
blueBand.ReadRaster(0, 0, width, height, blue, width, height, 0, 0);
int[] outRed = WhiteBalanceBand(red);
int[] outGreen = WhiteBalanceBand(green);
int[] outBlue = WhiteBalanceBand(blue);
outRedBand.WriteRaster(0, 0, width, height, outRed, width, height, 0, 0);
outGreenBand.WriteRaster(0, 0, width, height, outGreen, width, height, 0, 0);
outBlueBand.WriteRaster(0, 0, width, height, outBlue, width, height, 0, 0);
outImage.FlushCache();
}
}
}
private List <double[]> readImageCoordinatesBoundsInLonLat(Dataset imageDataset)
{
var band = imageDataset.GetRasterBand(1);
if (band == null)
{
return(null);
}
var width = band.XSize;
var height = band.YSize;
double[] geoTransformerData = new double[6];
imageDataset.GetGeoTransform(geoTransformerData);
SpatialReference currentReference = new SpatialReference(imageDataset.GetProjectionRef());
SpatialReference newReference = GdalUtilities.getWgs84Reference();
CoordinateTransformation ct = new CoordinateTransformation(currentReference, newReference);
double[] northWestPoint = new double[2] {
geoTransformerData[0], geoTransformerData[3]
};
ct.TransformPoint(northWestPoint);
double[] southEastPoint = new double[2] {
geoTransformerData[0] + geoTransformerData[1] * width,
geoTransformerData[3] + geoTransformerData[5] * height
};
ct.TransformPoint(southEastPoint);
return(new List <double[]> {
northWestPoint, southEastPoint
});
}
