Example Fit Ellipse - Revision history

Peter at 21:02, 17 January 2022

2022-01-17T21:02:01Z

← Older revision		Revision as of 21:02, 17 January 2022
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	Example Code:		Example Code:
	* [https://github.com/lessthanoptimal/BoofCV/blob/v0.38/examples/src/main/java/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]		* [https://github.com/lessthanoptimal/BoofCV/blob/v0.40/examples/src/main/java/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]

	Concepts:		Concepts:
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	public static void main( String[] args ) {		public static void main( String[] args ) {
	// load and convert the image into a usable format		// load and convert the image into a usable format
	BufferedImage image = UtilImageIO.~~loadImage~~(UtilIO.pathExample("particles01.jpg"));		BufferedImage image = UtilImageIO.loadImageNotNull(UtilIO.pathExample("particles01.jpg"));
	GrayF32 input = ConvertBufferedImage.convertFromSingle(image, null, GrayF32.class);		GrayF32 input = ConvertBufferedImage.convertFromSingle(image, null, GrayF32.class);

	GrayU8 binary = new GrayU8(input.width,input.height);		GrayU8 binary = new GrayU8(input.width, input.height);

	// the mean pixel value is often a reasonable threshold when creating a binary image		// the mean pixel value is often a reasonable threshold when creating a binary image
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	// create a binary image by thresholding		// create a binary image by thresholding
	ThresholdImageOps.threshold(input, binary, (float) mean, true);		ThresholdImageOps.threshold(input, binary, (float)mean, true);

	// reduce noise with some filtering		// reduce noise with some filtering
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	g2.setColor(Color.RED);		g2.setColor(Color.RED);

	for( Contour c : contours ) {		for (Contour c : contours) {
	FitData<EllipseRotated_F64> ellipse = ShapeFittingOps.fitEllipse_I32(c.external,0,false,null);		FitData<EllipseRotated_F64> ellipse = ShapeFittingOps.fitEllipse_I32(c.external, 0, false, null);
	VisualizeShapes.drawEllipse(ellipse.shape, g2);		VisualizeShapes.drawEllipse(ellipse.shape, g2);
	}		}

	// ShowImages.showWindow(VisualizeBinaryData.renderBinary(filtered, false, null),"Binary",true);		// ShowImages.showWindow(VisualizeBinaryData.renderBinary(filtered, false, null),"Binary",true);
	ShowImages.showWindow(image,"Ellipses",true);		ShowImages.showWindow(image, "Ellipses", true);
	}		}
	}		}
	</syntaxhighlight>		</syntaxhighlight>

Peter at 17:46, 12 July 2021

2021-07-12T17:46:38Z

← Older revision		Revision as of 17:46, 12 July 2021
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	Example Code:		Example Code:
	* [https://github.com/lessthanoptimal/BoofCV/blob/v0.37/examples/src/main/java/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]		* [https://github.com/lessthanoptimal/BoofCV/blob/v0.38/examples/src/main/java/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]

	Concepts:		Concepts:

Peter at 20:07, 21 December 2020

2020-12-21T20:07:41Z

← Older revision		Revision as of 20:07, 21 December 2020
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	Example Code:		Example Code:
	* [https://github.com/lessthanoptimal/BoofCV/blob/v0.31/examples/src/main/java/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]		* [https://github.com/lessthanoptimal/BoofCV/blob/v0.37/examples/src/main/java/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]

	Concepts:		Concepts:
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	*/		*/
	public class ExampleFitEllipse {		public class ExampleFitEllipse {
			public static void main( String[] args ) {
	public static void main( String ~~args~~[] ) {
	// load and convert the image into a usable format		// load and convert the image into a usable format
	BufferedImage image = UtilImageIO.loadImage(UtilIO.pathExample("particles01.jpg"));		BufferedImage image = UtilImageIO.loadImage(UtilIO.pathExample("particles01.jpg"));

Peter at 02:53, 17 October 2018

2018-10-17T02:53:17Z

← Older revision		Revision as of 02:53, 17 October 2018
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	Example Code:		Example Code:
	* [https://github.com/lessthanoptimal/BoofCV/blob/v0.30/examples/src/main/java/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]		* [https://github.com/lessthanoptimal/BoofCV/blob/v0.31/examples/src/main/java/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]

	Concepts:		Concepts:
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	filtered = BinaryImageOps.dilate8(filtered, 1, null);		filtered = BinaryImageOps.dilate8(filtered, 1, null);

	// Find ~~the contour~~ around ~~the shapes~~		// Find only external contours around each shape. Much faster than if internal + labeled images are considered.
	List<Contour> contours = BinaryImageOps.~~contour~~(filtered, ConnectRule.EIGHT~~,null~~);		List<Contour> contours = BinaryImageOps.contourExternal(filtered, ConnectRule.EIGHT);

	// Fit an ellipse to each external contour and draw the results		// Fit an ellipse to each external contour and draw the results
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	}		}
	}		}

	</syntaxhighlight>		</syntaxhighlight>

Peter at 04:07, 22 May 2018

2018-05-22T04:07:40Z

← Older revision		Revision as of 04:07, 22 May 2018
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	Example Code:		Example Code:
	* [https://github.com/lessthanoptimal/BoofCV/blob/v0.23/examples/src/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]		* [https://github.com/lessthanoptimal/BoofCV/blob/v0.30/examples/src/main/java/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]

	Concepts:		Concepts:
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	}		}
	}		}

	</syntaxhighlight>		</syntaxhighlight>

Peter at 04:10, 8 December 2016

2016-12-08T04:10:30Z

← Older revision		Revision as of 04:10, 8 December 2016
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	* Best fit shape		* Best fit shape

	Relevant ~~Applets~~:		Relevant Examples:
	* [[~~Applet Contour~~\| ~~Contour Detector~~]]		* [[Example_Binary_Image\| Binary Image Processing]]
	* [[~~Applet Shape Fitting~~\| ~~Shape~~ Fitting]]		* [[Example_Fit_Polygon\| Polygon Fitting]]

	= Example Code =		= Example Code =

Peter at 05:21, 28 March 2016

2016-03-28T05:21:24Z

← Older revision		Revision as of 05:21, 28 March 2016
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	Example Code:		Example Code:
	* [https://github.com/lessthanoptimal/BoofCV/blob/v0.20/examples/src/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]		* [https://github.com/lessthanoptimal/BoofCV/blob/v0.23/examples/src/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]

	Concepts:		Concepts:
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	// load and convert the image into a usable format		// load and convert the image into a usable format
	BufferedImage image = UtilImageIO.loadImage(UtilIO.pathExample("particles01.jpg"));		BufferedImage image = UtilImageIO.loadImage(UtilIO.pathExample("particles01.jpg"));
	~~ImageFloat32~~ input = ConvertBufferedImage.convertFromSingle(image, null, ~~ImageFloat32~~.class);		GrayF32 input = ConvertBufferedImage.convertFromSingle(image, null, GrayF32.class);

	~~ImageUInt8~~ binary = new ~~ImageUInt8~~(input.width,input.height);		GrayU8 binary = new GrayU8(input.width,input.height);

	// the mean pixel value is often a reasonable threshold when creating a binary image		// the mean pixel value is often a reasonable threshold when creating a binary image
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	// reduce noise with some filtering		// reduce noise with some filtering
	~~ImageUInt8~~ filtered = BinaryImageOps.erode8(binary, 1, null);		GrayU8 filtered = BinaryImageOps.erode8(binary, 1, null);
	filtered = BinaryImageOps.dilate8(filtered, 1, null);		filtered = BinaryImageOps.dilate8(filtered, 1, null);

Peter at 16:44, 9 November 2015

2015-11-09T16:44:38Z

← Older revision		Revision as of 16:44, 9 November 2015
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	Example Code:		Example Code:
	* [https://github.com/lessthanoptimal/BoofCV/blob/v0.19/examples/src/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]		* [https://github.com/lessthanoptimal/BoofCV/blob/v0.20/examples/src/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]

	Concepts:		Concepts:
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	public static void main( String args[] ) {		public static void main( String args[] ) {
	// load and convert the image into a usable format		// load and convert the image into a usable format
	BufferedImage image = UtilImageIO.loadImage("~~../data/applet/~~particles01.jpg");		BufferedImage image = UtilImageIO.loadImage(UtilIO.pathExample("particles01.jpg"));
	ImageFloat32 input = ConvertBufferedImage.convertFromSingle(image, null, ImageFloat32.class);		ImageFloat32 input = ConvertBufferedImage.convertFromSingle(image, null, ImageFloat32.class);

Peter at 12:50, 16 September 2015

2015-09-16T12:50:20Z

← Older revision		Revision as of 12:50, 16 September 2015
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	Example Code:		Example Code:
	* [https://github.com/lessthanoptimal/BoofCV/blob/v0.17/examples/src/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]		* [https://github.com/lessthanoptimal/BoofCV/blob/v0.19/examples/src/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]

	Concepts:		Concepts:
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	}		}

	// ShowImages.showWindow(VisualizeBinaryData.renderBinary(filtered,null),"Binary");		// ShowImages.showWindow(VisualizeBinaryData.renderBinary(filtered, false, null),"Binary",true);
	ShowImages.showWindow(image,"Ellipses");		ShowImages.showWindow(image,"Ellipses",true);
	}		}
	}		}
	</syntaxhighlight>		</syntaxhighlight>

Peter at 18:08, 19 June 2014

2014-06-19T18:08:10Z

← Older revision		Revision as of 18:08, 19 June 2014
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	Example Code:		Example Code:
	* [https://github.com/lessthanoptimal/BoofCV/blob/v0.16/examples/src/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]		* [https://github.com/lessthanoptimal/BoofCV/blob/v0.17/examples/src/boofcv/examples/features/ExampleFitEllipse.java ExampleFitEllipse.java]

	Concepts:		Concepts:
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	// reduce noise with some filtering		// reduce noise with some filtering
	ImageUInt8 filtered = BinaryImageOps.erode8(binary,null);		ImageUInt8 filtered = BinaryImageOps.erode8(binary, 1, null);
	filtered = BinaryImageOps.dilate8(filtered, null);		filtered = BinaryImageOps.dilate8(filtered, 1, null);

	// Find the contour around the shapes		// Find the contour around the shapes
	List<Contour> contours = BinaryImageOps.contour(filtered,8,null);		List<Contour> contours = BinaryImageOps.contour(filtered, ConnectRule.EIGHT,null);

	// Fit an ellipse to each external contour and draw the results		// Fit an ellipse to each external contour and draw the results