Java GThresholdImageOps类代码示例

import boofcv.alg.filter.binary.GThresholdImageOps; //导入依赖的package包/类
/**
 * Applies a contour-detection algorithm on the provided image and returns a list of detected contours. First, the image
 * is converted to a BinaryImage using a threshold algorithm (Otsu). Afterwards, blobs in the image are detected using
 * an 8-connect rule.
 *
 * @param image BufferedImage in which contours should be detected.
 * @return List of contours.
 */
public static List<Contour> getContours(BufferedImage image) {
    /* Draw a black frame around to image so as to make sure that all detected contours are internal contours. */
    BufferedImage resized = new BufferedImage(image.getWidth() + 4, image.getHeight() + 4, image.getType());
    Graphics g = resized.getGraphics();
    g.setColor(Color.BLACK);
    g.fillRect(0,0,resized.getWidth(),resized.getHeight());
    g.drawImage(image, 2,2, image.getWidth(), image.getHeight(), null);

    /* Convert to BufferedImage to Gray-scale image and prepare Binary image. */
    GrayF32 input = ConvertBufferedImage.convertFromSingle(resized, null, GrayF32.class);
    GrayU8 binary = new GrayU8(input.width,input.height);
    GrayS32 label = new GrayS32(input.width,input.height);

    /* Select a global threshold using Otsu's method and apply that threshold. */
    double threshold = GThresholdImageOps.computeOtsu(input, 0, 255);
    ThresholdImageOps.threshold(input, binary,(float)threshold,true);

    /* Remove small blobs through erosion and dilation;  The null in the input indicates that it should internally
     * declare the work image it needs this is less efficient, but easier to code. */
    GrayU8 filtered = BinaryImageOps.erode8(binary, 1, null);
    filtered = BinaryImageOps.dilate8(filtered, 1, null);

    /* Detect blobs inside the image using an 8-connect rule. */
    return BinaryImageOps.contour(filtered, ConnectRule.EIGHT, label);
}
 

import boofcv.alg.filter.binary.GThresholdImageOps; //导入依赖的package包/类
/**
 * Processes the image and automatically detects calibration grid.  If successful then
 * true is returned and the found target is contained in the target detector.
 *
 * @param detector Target detection algorithm.
 * @param gray Gray scale image which is being thresholded
 * @return true if a threshold was successfully found and target detected.
 */
public boolean process( DetectSquareCalibrationPoints detector , ImageFloat32 gray ) {

	binary.reshape(gray.width,gray.height);

	double threshold = initialThreshold;
	if( threshold < 0 )
		threshold = UtilCalibrationGrid.selectThreshold(gray,histogram);

	GThresholdImageOps.threshold(gray,binary,threshold,true);

	// see if the target was detected
	if( detector.process(binary) ) {
		refinedThreshold = refineThreshold(detector.getInterestSquares(),gray);
		GThresholdImageOps.threshold(gray,binary,threshold,true);
		if( !detector.process(binary) ) {
			throw new RuntimeException("Crap new threshold doesn't work!");
		}
		return true;
	}

	return false;
}
 

import boofcv.alg.filter.binary.GThresholdImageOps; //导入依赖的package包/类
@Override
public List<LineSegment2D_F32> detect(T input) {

	derivX.reshape(input.width,input.height);
	derivY.reshape(input.width,input.height);
	edgeIntensity.reshape(input.width,input.height);
	detected.reshape(input.width,input.height);

	gradient.process(input,derivX,derivY);
	GGradientToEdgeFeatures.intensityAbs(derivX, derivY, edgeIntensity);
	GThresholdImageOps.threshold(edgeIntensity, detected, edgeThreshold, false);

	detectorGrid.process(derivX,derivY,detected);

	MatrixOfList<LineSegment2D_F32> grid = detectorGrid.getFoundLines();
	if( connect != null ) {
		connect.process(grid);
	}

	List<LineSegment2D_F32> found = grid.createSingleList();
	LineImageOps.mergeSimilar(found, (float) (Math.PI * 0.03), 5f);

	return found;
}
 

import boofcv.alg.filter.binary.GThresholdImageOps; //导入依赖的package包/类
private synchronized void performWork() {
	if( filter == null )
		return;
	GThresholdImageOps.threshold(imageInput, imageBinary, selectThresh.getThreshold(), selectThresh.isDown());
	filter.process(imageBinary,imageOutput);

	SwingUtilities.invokeLater(new Runnable() {
		public void run() {
			if (work == null || work.getWidth() != imageInput.width || work.getHeight() != imageInput.height) {
				work = new BufferedImage(imageInput.width, imageInput.height, BufferedImage.TYPE_INT_BGR);
			}
			VisualizeBinaryData.renderBinary(selectedVisualize, work);
			gui.setBufferedImage(work);
			gui.setPreferredSize(new Dimension(imageInput.width, imageInput.height));
			processedImage = true;
			gui.repaint();
		}
	});
}
 

import boofcv.alg.filter.binary.GThresholdImageOps; //导入依赖的package包/类
private synchronized void performWork() {
	if( filter1 == null || filter2 == null )
		return;
	GThresholdImageOps.threshold(imageInput, imageBinary, selectThresh.getThreshold(), selectThresh.isDown());
	filter1.process(imageBinary,imageOutput1);
	filter2.process(imageOutput1,imageOutput2);
	List<Contour> found = BinaryImageOps.contour(imageOutput2, connectRule, imageLabeled);
	if( colors == null || colors.length <= found.size() )
		colors = BinaryImageOps.selectRandomColors(found.size(),rand);

	SwingUtilities.invokeLater(new Runnable() {
		public void run() {
			if (work == null || work.getWidth() != imageInput.width || work.getHeight() != imageInput.height) {
				work = new BufferedImage(imageInput.width, imageInput.height, BufferedImage.TYPE_INT_BGR);
			}
			renderVisualizeImage();
			gui.setBufferedImage(work);
			gui.setPreferredSize(new Dimension(imageInput.width, imageInput.height));
			processedImage = true;
			gui.repaint();
		}
	});
}
 

import boofcv.alg.filter.binary.GThresholdImageOps; //导入依赖的package包/类
public GrayImageProcessor binarize(int minValue, int maxValue, boolean down) {
    // Select a global threshold using Otsu's method.
    double threshold = GThresholdImageOps.computeOtsu(image, minValue, maxValue);
    // Apply the threshold to create a binary image
    GrayU8 newImage = ThresholdImageOps.threshold(image, null, (int) threshold, down);
    addImageToPanel(newImage, String.format("Binarize (min %d, max %d, down %s)", minValue, maxValue, down));
    return new GrayImageProcessor(newImage);
}
 

import boofcv.alg.filter.binary.GThresholdImageOps; //导入依赖的package包/类
static BufferedImage generateBlackWhiteImage(String path, boolean save) throws IOException {
    BufferedImage in = ImageIO.read(new File(path));

    // convert into a usable format
    GrayF32 input = ConvertBufferedImage.convertFromSingle(in, null, GrayF32.class);
    GrayU8 binary = new GrayU8(input.width, input.height);
    GrayS32 label = new GrayS32(input.width, input.height);

    // Select a global threshold using Otsu's method.
    double threshold = GThresholdImageOps.computeOtsu(input, 0, 255);

    // Apply the threshold to create a binary image
    ThresholdImageOps.threshold(input, binary, (float) threshold, true);

    // remove small blobs through erosion and dilation
    // The null in the input indicates that it should internally declare the work image it needs
    // this is less efficient, but easier to code.
    GrayU8 filtered = BinaryImageOps.erode8(binary, 1, null);
    filtered = BinaryImageOps.dilate8(filtered, 1, null);

    // Detect blobs inside the image using an 8-connect rule
    List<Contour> contours = BinaryImageOps.contour(filtered, ConnectRule.EIGHT, label);

    // display the results
    BufferedImage visualBinary = VisualizeBinaryData.renderBinary(binary, false, null);


    if (save) { // Save the image, if necessary
        File outputfile = new File("saved.png");
        ImageIO.write(visualBinary, "png", outputfile);
    }

    System.out.println("Done with part 1!");

    return visualBinary;

}
 

import boofcv.alg.filter.binary.GThresholdImageOps; //导入依赖的package包/类
@Override
public long iteration() {
	long count = 0;
	for (int i = 0; i < repeats; i++) {
		double threshold = GThresholdImageOps.computeOtsu(image, 0, 256);
		ThresholdImageOps.threshold(image, binary, (float) threshold, true);
		count++;
	}
	return count++;
}
 

import boofcv.alg.filter.binary.GThresholdImageOps; //导入依赖的package包/类
/**
 * Threshold the image and find squares
 */
private boolean detectChessBoard(T gray, double threshold , boolean first ) {

	actualBinaryThreshold = threshold;
	if( actualBinaryThreshold < 0 )
		actualBinaryThreshold = UtilCalibrationGrid.selectThreshold(gray,histogram);

	GThresholdImageOps.threshold(gray, binary, actualBinaryThreshold, true);

	// erode to make the squares separated
	BinaryImageOps.erode8(binary, eroded);

	if (findBound.process(eroded)) {
		if( userBinaryThreshold < 0 ) {
			// second pass to improve threshold
			return detectChessBoardSubImage(gray);
		} else {
			return true;
		}
	} else if( first && userBinaryThreshold < 0 ) {
		// if the target is small and the background dark, the threshold will be too low
		// if the target is small and the background white, it will still estimate a good threshold
		// so try a larger value before giving up
		threshold = (255+threshold)/2;
		return detectChessBoard(gray,threshold,false);
	}

	return false;
}
 

import boofcv.alg.filter.binary.GThresholdImageOps; //导入依赖的package包/类
/**
 * Look for the target only inside a specific region.  The threshold can be more accurate selected this way
 */
private boolean detectChessBoardSubImage( T gray ) {

	// region the target is contained inside of
	ImageRectangle targetBound = findBound.getBoundRect();

	// expand the bound a bit
	int w = targetBound.getWidth();
	int h = targetBound.getHeight();

	ImageRectangle expanded = new ImageRectangle();
	int adj = (int)(w*0.12);
	expanded.x0 = targetBound.x0-adj;
	expanded.x1 = targetBound.x1+adj;
	adj = (int)(h*0.12);
	expanded.y0 = targetBound.y0-adj;
	expanded.y1 = targetBound.y1+adj;

	BoofMiscOps.boundRectangleInside(gray, expanded);

	// create sub-images for processing.  recompute threshold just around the area of interest and
	// only look for the target inside that
	T subGray = (T)gray.subimage(expanded.x0,expanded.y0,expanded.x1,expanded.y1);
	actualBinaryThreshold = UtilCalibrationGrid.selectThreshold(subGray,histogram);

	GImageMiscOps.fill(binary,0);
	ImageUInt8 subBinary = (ImageUInt8)binary.subimage(expanded.x0,expanded.y0,expanded.x1,expanded.y1);
	GThresholdImageOps.threshold(subGray, subBinary, actualBinaryThreshold, true);

	// The new threshold tends to require two erodes
	BinaryImageOps.erode8(binary, eroded);
	BinaryImageOps.erode4(eroded, binary);
	BinaryImageOps.dilate4(binary, eroded);

	if (findBound.process(eroded))
		return true;

	return false;
}
 

import boofcv.alg.filter.binary.GThresholdImageOps; //导入依赖的package包/类
/**
 * Process the gray scale image.  Use a manually selected threshold or
 */
private void detectTarget() {

	if( calibGUI.isManual() ) {
		GThresholdImageOps.threshold(gray,binary,calibGUI.getThresholdLevel(),true);

		foundTarget = alg.process(binary);
	} else {
		foundTarget = auto.process(alg,gray);
		calibGUI.setThreshold((int)auto.getThreshold());
		binary.setTo(auto.getBinary());
	}

}
 

import boofcv.alg.filter.binary.GThresholdImageOps; //导入依赖的package包/类
private void doProcess() {
	if( input == null )
		return;

	final BufferedImage temp;

	if( activeAlg == 0 ) {
		if( previousBlur != barCanny.getBlurRadius() ) {
			previousBlur = barCanny.getBlurRadius();
			canny =  FactoryEdgeDetectors.canny(previousBlur,true, true, imageType, derivType);
		}

		double thresh = barCanny.getThreshold()/100.0;
		canny.process(workImage,(float)thresh*0.1f,(float)thresh,null);
		List<EdgeContour> contours = canny.getContours();

		temp = VisualizeBinaryData.renderContours(contours,null,workImage.width,workImage.height,null);
	} else {
		// create a binary image by thresholding
		GThresholdImageOps.threshold(workImage, binary, barBinary.getThreshold(), barBinary.isDown());

		contour.process(binary,labeled);
		temp = VisualizeBinaryData.renderContours(contour.getContours().toList(),null,0xFF1010,
				workImage.width,workImage.height,null);
	}

	SwingUtilities.invokeLater(new Runnable() {
		public void run() {
			panel.setBufferedImage(temp);
			panel.repaint();
		}});
}
 

import boofcv.alg.filter.binary.GThresholdImageOps; //导入依赖的package包/类
public void process( final BufferedImage input ) {
	setInputImage(input);
	this.input.reshape(input.getWidth(),input.getHeight());
	ConvertBufferedImage.convertFromSingle(input, this.input, ImageUInt8.class);
	this.binary.reshape(input.getWidth(), input.getHeight());
	this.filtered.reshape(input.getWidth(),input.getHeight());
	this.output = new BufferedImage( input.getWidth(), input.getHeight(), BufferedImage.TYPE_INT_RGB);

	// the mean pixel value is often a reasonable threshold when creating a binary image
	double mean = ImageStatistics.mean(this.input);

	// create a binary image by thresholding
	GThresholdImageOps.threshold(this.input, binary, mean, true);

	// reduce noise with some filtering
	BinaryImageOps.erode8(binary, filtered);
	BinaryImageOps.dilate8(filtered, binary);

	// Find the contour around the shapes
	contours = BinaryImageOps.contour(binary,8,null);

	SwingUtilities.invokeLater(new Runnable() {
		public void run() {
			gui.setPreferredSize(new Dimension(input.getWidth(), input.getHeight()));
			processImage = true;
		}});
	doRefreshAll();
}
 

import boofcv.alg.filter.binary.GThresholdImageOps; //导入依赖的package包/类
@Override
protected Bitmap doInBackground(String... params) {

    Bitmap image = BitmapFactory.decodeFile(params[0]);

    Bitmap image2 = Bitmap.createScaledBitmap(image, 500, 500, false);

    // convert into a usable format
    ImageFloat32 input = ConvertBitmap.bitmapToGray(image2,(ImageFloat32)null,null);                    //(image, null, ImageFloat32.class);

    ImageUInt8 binary = new ImageUInt8(input.width,input.height);

    GThresholdImageOps.localSauvola(input, binary, progress, 0.3f, false);
    VisualizeImageData.binaryToBitmap(binary, false, image2, null);

    image = image2;
    return image;
}
 

import boofcv.alg.filter.binary.GThresholdImageOps; //导入依赖的package包/类
/**
 * The main method.
 *
 * @param args the arguments
 */
public static void main( String args[] ) {
	// load and convert the image into a usable format
	BufferedImage image = UtilImageIO.loadImage(UtilIO.pathExample("/home/pete/development/gitrepo/iote2e/iote2e-tests/images/iote2e-test.png"));

	// convert into a usable format
	GrayF32 input = ConvertBufferedImage.convertFromSingle(image, null, GrayF32.class);
	GrayU8 binary = new GrayU8(input.width,input.height);
	GrayS32 label = new GrayS32(input.width,input.height);

	// Select a global threshold using Otsu's method.
	double threshold = GThresholdImageOps.computeOtsu(input, 0, 255);

	// Apply the threshold to create a binary image
	ThresholdImageOps.threshold(input,binary,(float)threshold,true);

	// remove small blobs through erosion and dilation
	// The null in the input indicates that it should internally declare the work image it needs
	// this is less efficient, but easier to code.
	GrayU8 filtered = BinaryImageOps.erode8(binary, 1, null);
	filtered = BinaryImageOps.dilate8(filtered, 1, null);

	// Detect blobs inside the image using an 8-connect rule
	List<Contour> contours = BinaryImageOps.contour(filtered, ConnectRule.EIGHT, label);

	// colors of contours
	int colorExternal = 0xFFFFFF;
	int colorInternal = 0xFF2020;

	// display the results
	BufferedImage visualBinary = VisualizeBinaryData.renderBinary(binary, false, null);
	BufferedImage visualFiltered = VisualizeBinaryData.renderBinary(filtered, false, null);
	BufferedImage visualLabel = VisualizeBinaryData.renderLabeledBG(label, contours.size(), null);
	BufferedImage visualContour = VisualizeBinaryData.renderContours(contours, colorExternal, colorInternal,
			input.width, input.height, null);

	ListDisplayPanel panel = new ListDisplayPanel();
	panel.addImage(visualBinary, "Binary Original");
	panel.addImage(visualFiltered, "Binary Filtered");
	panel.addImage(visualLabel, "Labeled Blobs");
	panel.addImage(visualContour, "Contours");
	ShowImages.showWindow(panel,"Binary Operations",true);
}