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FireSight interprets a declarative specification of an image processing pipeline that generates a data model of the recognized features for use by other applications. The pipeline declaration and data model both use the JSON data format. Examples shown below all use the firesight command line application.

Pipeline Stages

Each stage in a pipeline performs a specific operation on the current pipeline image. Pipeline stages can be named. If the "name" field is omitted, stages are named in sequence: s1, s2, etc. Stage operation is defined by the "op" field:

• op absdiff Compare pixel intensities of two images
• op backgroundSubtractor Also will run if passed the pipeline name bgsub
• op blur
• op calcHist Add histogram to pipeline model
• op calcOffset Calculate offset between two images
• op Canny Finds edges in an image using the Canny86 algorithm.
• op Circle Draws a circle
• op crop Crops pipeline image to rectangle
• op cvtColor Change image color model
• op dft Discrete Fourier Transform
• op dftSpectrum Analyze DFT
• op dilate Morphological operation. The background (bright) dilates around the black regions of the letter.
• op drawKeypoints Visualize key feature points in pipeline model
• op drawRects Visualize rectangles in pipeline model
• op erode Morphological operation. Bright areas of the image (usually the background) get thinner, whereas the dark zones (the “writing”) gets bigger.
• op FireSight FireSight configuration
• op HoleRecognizer
• op HoughCircles Circle detector based on Hough transform
• op imread Read image (multiple formats)
• op imwrite Write image (multiple formats)
• op matchGrid Match line intersection points of simple grid
• op matchTemplate Match all instances of given template image
• op meanStdDev Find mean and standard deviation of intensities
• op minAreaRect Find minimum area rectangle enclosing pixels within intensity range
• op MSER Blob detection
• op morph Morphological operations
• op normalize Adjust intensity
• op Points2Resolution_RANSAC
• op PSNR Compare two images for similarity using peak signal to noise ratio
• op putText Annotate image
• op QRDecode Decode QR
• op rectangle
• op resize
• op Sharpness Compute 'sharpness' of an image
• op SimpleBlobDetector
• op stageImage Replace current pipeline image with previous stage image
• op threshold Manipulate pixel intensity ranges
• op transparent Make image transparent by adding an alpha channel
• op undistort Apply camera calibration to undistort image
• op warpAffine Scale, translate and/or rotate image
• op warpRing Create rotation-invariant matching templates
• op warpPerspective Calculates a perspective transform from four pairs of the corresponding points.

See Also

• Pipeline Parameters Create customizable pipelines
• Building Firesight Play with or extend FireSight