Examples with RescaleOp java.awt.image.RescaleOp used on opensource projects

Example 6 with RescaleOp

use of java.awt.image.RescaleOp in project HearthStats.net-Uploader by HearthStats.

the class OcrBase method filter.

/**
     * Filters the image to make it easier to OCR, such as by turning it greyscale and increasing the contrast.
     *
     * @param image A cropped image
     * @param iteration The iteration number, zero-based
     * @return
     * @throws OcrException
     */
protected BufferedImage filter(BufferedImage image, int iteration) throws OcrException {
    int width = image.getWidth();
    int height = image.getHeight();
    int bigWidth = width * 3;
    int bigHeight = height * 3;
    // to gray scale
    BufferedImage grayscale = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_RGB);
    BufferedImageOp grayscaleConv = new ColorConvertOp(image.getColorModel().getColorSpace(), grayscale.getColorModel().getColorSpace(), null);
    grayscaleConv.filter(image, grayscale);
    // blow it up for ocr
    BufferedImage newImage = new BufferedImage(bigWidth, bigHeight, BufferedImage.TYPE_INT_RGB);
    Graphics g = newImage.createGraphics();
    g.drawImage(grayscale, 0, 0, bigWidth, bigHeight, null);
    g.dispose();
    // invert image
    for (int x = 0; x < bigWidth; x++) {
        for (int y = 0; y < bigHeight; y++) {
            int rgba = newImage.getRGB(x, y);
            Color col = new Color(rgba, true);
            col = new Color(255 - col.getRed(), 255 - col.getGreen(), 255 - col.getBlue());
            newImage.setRGB(x, y, col.getRGB());
        }
    }
    // increase contrast
    try {
        RescaleOp rescaleOp = new RescaleOp(1.8f, -30, null);
        // Source and destination are the same.
        rescaleOp.filter(newImage, newImage);
    } catch (Exception e) {
        throw new OcrException("Error rescaling OCR image", e);
    }
    return newImage;
}

Example 7 with RescaleOp

use of java.awt.image.RescaleOp in project spatial-portal by AtlasOfLivingAustralia.

the class PrintMapComposer method drawGoogle.

private List drawGoogle(Graphics2D g, String maptype, boolean drawTiles) {
    List imageUrls = new ArrayList();
    double[] resolutions = { 156543.03390625, 78271.516953125, 39135.7584765625, 19567.87923828125, 9783.939619140625, 4891.9698095703125, 2445.9849047851562, 1222.9924523925781, 611.4962261962891, 305.74811309814453, 152.87405654907226, 76.43702827453613, 38.218514137268066, 19.109257068634033, 9.554628534317017, 4.777314267158508, 2.388657133579254, 1.194328566789627, 0.5971642833948135 };
    //nearest resolution
    int imgSize = 640;
    int gScale = 2;
    double actualWidth = extents[2] - extents[0];
    double actualHeight = extents[3] - extents[1];
    int res = 0;
    while (res < resolutions.length - 1 && resolutions[res + 1] * imgSize > actualWidth && resolutions[res + 1] * imgSize > actualHeight) {
        res++;
    }
    int centerX = (int) ((extents[2] - extents[0]) / 2 + extents[0]);
    int centerY = (int) ((extents[3] - extents[1]) / 2 + extents[1]);
    double latitude = SpatialUtil.convertMetersToLat(centerY);
    double longitude = SpatialUtil.convertMetersToLng(centerX);
    //need to change the size requested so the extents match the output extents.
    int imgWidth = (int) ((extents[2] - extents[0]) / resolutions[res]);
    int imgHeight = (int) ((extents[3] - extents[1]) / resolutions[res]);
    String uri = "http://maps.googleapis.com/maps/api/staticmap?";
    String parameters = "center=" + latitude + "," + longitude + "&zoom=" + res + "&scale=" + gScale + "&size=" + imgWidth + "x" + imgHeight + "&maptype=" + maptype;
    String key = CommonData.getSettings().getProperty("google.maps.apikey", null);
    if (key != null)
        parameters += "&key=" + key;
    RescaleOp op = new RescaleOp(new float[] { 1f, 1f, 1f, 1f }, new float[] { 0f, 0f, 0f, 0f }, null);
    LOGGER.debug("print uri: " + uri + parameters);
    imageUrls.add(uri + parameters);
    if (drawTiles) {
        BufferedImage img = getImage(uri + parameters, true);
        if (img != null) {
            BufferedImage tmp = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
            tmp.getGraphics().drawImage(img, 0, 0, width, height, 0, 0, imgWidth * gScale, imgHeight * gScale, null);
            g.drawImage(tmp, op, 0, 0);
        }
    }
    return imageUrls;
}

Example 8 with RescaleOp

use of java.awt.image.RescaleOp in project spatial-portal by AtlasOfLivingAustralia.

the class PrintMapComposer method drawUri.

private List drawUri(Graphics2D g, String uri, float opacity, boolean imageOnly256, boolean drawTiles) {
    List imageUrls = new ArrayList();
    //tiles
    double minX, maxX, minY, maxY, stepX, stepY;
    minX = extents[0];
    maxX = extents[2];
    minY = extents[1];
    maxY = extents[3];
    int pageWidth = width;
    int pageHeight = height;
    int tileWidth = 1024;
    int tileHeight = 1024;
    if (imageOnly256) {
        tileWidth = 256;
        tileHeight = 256;
    }
    int ix;
    int iy;
    stepX = (maxX - minX) / pageWidth * tileWidth;
    stepY = (maxY - minY) / pageHeight * tileHeight;
    RescaleOp op = new RescaleOp(new float[] { 1f, 1f, 1f, opacity }, new float[] { 0f, 0f, 0f, 0f }, null);
    iy = 0;
    for (double y = maxY; y > minY; y -= stepY, iy++) {
        ix = 0;
        for (double x = minX; x < maxX; x += stepX, ix++) {
            String bbox = "&BBOX=" + x + "," + (y - stepY) + "," + (x + stepX) + "," + y + "&WIDTH=" + tileWidth + "&HEIGHT=" + tileHeight + "&TRANSPARENT=true";
            LOGGER.debug("print uri: " + uri + bbox);
            imageUrls.add(uri + bbox);
            if (drawTiles) {
                BufferedImage img = getImage(uri + bbox, true);
                if (img != null) {
                    int nx = ix * tileWidth;
                    int ny = iy * tileHeight;
                    BufferedImage tmp = new BufferedImage(tileWidth, tileHeight, BufferedImage.TYPE_INT_ARGB);
                    tmp.getGraphics().drawImage(img, 0, 0, null);
                    g.drawImage(tmp, op, nx, ny);
                }
            }
        }
    }
    return imageUrls;
}

Example 9 with RescaleOp

use of java.awt.image.RescaleOp in project spatial-portal by AtlasOfLivingAustralia.

the class PrintMapComposer method drawOSM.

private List drawOSM(Graphics2D g, boolean drawTiles) {
    List imageUrls = new ArrayList();
    double[] resolutions = { 156543.03390625, 78271.516953125, 39135.7584765625, 19567.87923828125, 9783.939619140625, 4891.9698095703125, 2445.9849047851562, 1222.9924523925781, 611.4962261962891, 305.74811309814453, 152.87405654907226, 76.43702827453613, 38.218514137268066, 19.109257068634033, 9.554628534317017, 4.777314267158508, 2.388657133579254, 1.194328566789627, 0.5971642833948135 };
    double[] origin = { -20037508.34, -20037508.34 };
    //nearest resolution
    double actualRes = (extents[2] - extents[0]) / width;
    int res = 0;
    while (res < resolutions.length && resolutions[res] > actualRes) {
        res++;
    }
    if (res > 0) {
        res--;
    }
    int tileWidth = 256;
    int tileHeight = 256;
    int tiles = (int) Math.pow(2, res);
    int sx = (int) Math.floor((extents[0] - origin[0]) / resolutions[res] / tileWidth);
    int sy = tiles - (int) Math.ceil((extents[3] - origin[1]) / resolutions[res] / tileHeight);
    int mx = (int) Math.ceil((extents[2] - origin[0]) / resolutions[res] / tileWidth);
    int my = tiles - (int) Math.floor((extents[1] - origin[1]) / resolutions[res] / tileHeight);
    if (sx < 0) {
        sx = 0;
    }
    if (my < 0) {
        my = 0;
    }
    if (sy >= tiles) {
        sy = tiles - 1;
    }
    int destWidth = width;
    //square tiles
    int srcWidth = (int) (destWidth / (extents[2] - extents[0]) * (tileWidth * resolutions[res]));
    int srcHeight = srcWidth;
    int xOffset = (int) ((sx - ((extents[0] - origin[0]) / resolutions[res] / tileWidth)) * srcWidth);
    int yOffset = (int) ((sy - (((-1 * origin[1]) - extents[3]) / resolutions[res] / tileHeight)) * srcHeight);
    RescaleOp op = new RescaleOp(new float[] { 1f, 1f, 1f, 1f }, new float[] { 0f, 0f, 0f, 0f }, null);
    String uri = "http://tile.openstreetmap.org/";
    for (int iy = my; iy >= sy; iy--) {
        for (int ix = sx; ix <= mx; ix++) {
            String bbox = res + "/" + (ix % tiles) + "/" + iy + ".png";
            LOGGER.trace("print uri: " + uri + bbox);
            imageUrls.add(uri + bbox);
            if (drawTiles) {
                BufferedImage img = getImage(uri + bbox, true);
                if (img != null) {
                    int nx = (ix - sx) * srcWidth + xOffset;
                    int ny = (iy - sy) * srcHeight + yOffset;
                    BufferedImage tmp = new BufferedImage(srcWidth, srcHeight, BufferedImage.TYPE_INT_ARGB);
                    tmp.getGraphics().drawImage(img, 0, 0, srcWidth, srcHeight, 0, 0, tileWidth, tileHeight, null);
                    g.drawImage(tmp, op, nx, ny);
                }
            }
        }
    }
    return imageUrls;
}

Example 10 with RescaleOp

use of java.awt.image.RescaleOp in project poi by apache.

the class BitmapImageRenderer method setAlpha.

@Override
public void setAlpha(double alpha) {
    if (img == null)
        return;
    Dimension dim = getDimension();
    BufferedImage newImg = new BufferedImage((int) dim.getWidth(), (int) dim.getHeight(), BufferedImage.TYPE_INT_ARGB);
    Graphics2D g = newImg.createGraphics();
    RescaleOp op = new RescaleOp(new float[] { 1.0f, 1.0f, 1.0f, (float) alpha }, new float[] { 0, 0, 0, 0 }, null);
    g.drawImage(img, op, 0, 0);
    g.dispose();
    img = newImg;
}