Java Code Examples for javax.imageio.stream.FileImageOutputStream#writeByte()

private void writeUInt16ParamChoiceToFile(File file, int selector, int value) throws IOException
{
    final FileImageOutputStream stream = new FileImageOutputStream(file);

    switch (selector)
    {
    case 1:
        stream.writeByte(value);
        break;

    case 2:
    case 3:
    case 4:
        stream.writeShort(value);
        break;

    case 5:
    case 6:
        break;

    default:
        stream.writeInt(value);
    }

    stream.close();
}
 

private void writeUInt32ParamChoiceToFile(File file, long selector, int value) throws IOException
{
    final FileImageOutputStream stream = new FileImageOutputStream(file);

    if (selector == 1)
    {
        stream.writeByte(value);
    }
    else if (selector == 2 || selector == 3 || selector == 4)
    {
        stream.writeShort(value);
    }
    else if (selector != 5 && selector != 6)
    {
        stream.writeInt(value);
    }

    stream.close();
}
 

private void writeUInt64ParamChoiceToFile(File file, BigInteger selector, int value) throws IOException
{
    final FileImageOutputStream stream = new FileImageOutputStream(file);

    if (selector.compareTo(new BigInteger("1")) == 0)
        stream.writeByte(value);
    else if (selector.compareTo(new BigInteger("2")) == 0 || selector.compareTo(new BigInteger("3")) == 0 ||
             selector.compareTo(new BigInteger("4")) == 0)
        stream.writeShort(value);
    else if (selector.compareTo(new BigInteger("5")) == 0 || selector.compareTo(new BigInteger("6")) == 0)
        ;
    else
        stream.writeInt(value);

    stream.close();
}
 

private void writeDefaultEmptyChoiceToFile(File file, byte tag, short value) throws IOException
{
    final FileImageOutputStream stream = new FileImageOutputStream(file);

    switch (tag)
    {
    case 1:
        stream.writeByte(value);
        break;

    case 2:
        stream.writeShort(value);
        break;

    default:
        break;
    }

    stream.close();
}
 

private void writeFullEnumParamChoiceToFile(File file, Selector selector, int value) throws IOException
{
    final FileImageOutputStream stream = new FileImageOutputStream(file);

    if (selector == Selector.BLACK)
        stream.writeByte(value);
    else if (selector == Selector.GREY)
        stream.writeShort(value);
    else if (selector == Selector.WHITE)
        stream.writeInt(value);
    else
        fail("Invalid selector: " + selector);

    stream.close();
}
 

private void writeBoolParamChoiceToFile(File file, boolean selector, int value) throws IOException
{
    final FileImageOutputStream stream = new FileImageOutputStream(file);

    if (selector)
        stream.writeByte(value);
    else
        stream.writeShort(value);

    stream.close();
}
 

private void writeEnumParamChoiceToFile(File file, Selector selector, int value) throws IOException
{
    final FileImageOutputStream stream = new FileImageOutputStream(file);

    if (selector == Selector.BLACK)
        stream.writeByte(value);
    else if (selector == Selector.GREY)
        stream.writeShort(value);
    else if (selector == Selector.WHITE)
        stream.writeInt(value);
    else
        fail("Invalid selector: " + selector);

    stream.close();
}
 

private void writeFullBitmaskParamChoiceToFile(File file, Selector selector, int value) throws IOException
{
    final FileImageOutputStream stream = new FileImageOutputStream(file);

    if (selector == Selector.Values.BLACK)
        stream.writeByte(value);
    else if (selector == Selector.Values.WHITE)
        stream.writeByte(value);
    else if (selector == Selector.Values.BLACK_AND_WHITE)
        stream.writeShort(value);
    else
        fail("Invalid selector: " + selector);

    stream.close();
}
 

private void writeBitmaskParamChoiceToFile(File file, Selector selector, int value) throws IOException
{
    final FileImageOutputStream stream = new FileImageOutputStream(file);

    if (selector == Selector.Values.BLACK)
        stream.writeByte(value);
    else if (selector == Selector.Values.WHITE)
        stream.writeByte(value);
    else if (selector == Selector.Values.BLACK_AND_WHITE)
        stream.writeShort(value);
    else
        fail("Invalid selector: " + selector);

    stream.close();
}
 

/**
 * Runs this program with the given parameters.
 */
private static void run(String inputPath, String outputPath)
        throws IOException {

    // Read the product (note that only 'nodes' are read, not the entire data!)
    Product product = ProductIO.readProduct(inputPath);
    // Get the scene width
    int w = product.getSceneRasterWidth();
    // Get the scene height
    int h = product.getSceneRasterHeight();

    // Get the "low" band
    Band lowBand = product.getBand("radiance_6");
    if (lowBand == null) {
        throw new IOException("low-band 'radiance_6' not found");
    }

    // Get the "high" band
    Band hiBand = product.getBand("radiance_10");
    if (hiBand == null) {
        throw new IOException("hi-band 'radiance_10' not found");
    }

    // Print out, what we are going to do...
    System.out.println("writing NDVI raw image file "
                       + outputPath
                       + " containing " + w + " x " + h
                       + " pixels of type byte (value range 0-255)...");

    // Create an output stream for the NDVI raw data
    FileImageOutputStream outputStream = new FileImageOutputStream(new File(outputPath));

    // Create a buffer for reading a single scan line of the low-band
    float[] lowBandPixels = new float[w];
    // Create a buffer for reading a single scan line of the hi-band
    float[] hiBandPixels = new float[w];

    // Hi/Low-band sum and difference of the NDVI quotient
    float sum, dif;
    // NDVI value
    float ndvi;
    // NDVI value in the range 0 to 255
    int ndviByte;

    // For all scan lines in the product...
    for (int y = 0; y < h; y++) {
        // Read low-band pixels for line y
        lowBand.readPixels(0, y, w, 1, lowBandPixels, new PrintWriterProgressMonitor(System.out));
        // Read hi-band pixels for line y
        hiBand.readPixels(0, y, w, 1, hiBandPixels, new PrintWriterProgressMonitor(System.out));

        // Compute NDVI for all x
        for (int x = 0; x < w; x++) {
            dif = lowBandPixels[x] - hiBandPixels[x];
            sum = lowBandPixels[x] + hiBandPixels[x];

            if (sum != 0.0F) {
                ndvi = dif / sum;
            } else {
                ndvi = 0.0F;
            }

            if (ndvi < 0.0F) {
                ndvi = 0.0F;
            } else if (ndvi > 1.0F) {
                ndvi = 1.0F;
            }

            // Convert NDVI to integer in the range 0 to 255
            ndviByte = (int) (255 * ndvi);

            // write NDVI byte to raw image file
            outputStream.writeByte(ndviByte);
        }
    }

    // close raw image file
    outputStream.close();

    // Done!
    System.out.println("OK");
}