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Model Based calibration

Information contained in the "file.ffgnn" files supplements the basic wire frame model "file.poly" by specifying the half-conics, lines and boundaries visible from specific directions. This set of features is referred to as a cliche. Both files must be loaded via the Smm Matcher Tool.

The standard camera calibration data structure contains transformation parameters which specify the location of the optical centre of the camera in the co-ordinate system of the calibration reference. When applied to object model the transformation therefore corresponds to that which will project the model into the image. Model based calibration can be initialised in one of two ways. Firstly the wire-frame object can be manipulated in the Model Tv associated with the wire-frame model matcher until the view approximates the orientation of the object in the left image. Secondly, an estimate of the transformation is available following a successful model matching with the Model Tool.

The resulting transformations for both cameras can be visualised by setting the Model Parameters, Project option to "all/print" and using the "model proj" function. This will project all features in the absence of specified view cliches. Use of the "cliche" option will project the features from the closest available cliche to the direction to the transformation. Points passing hypothesis tests are coloured green, those failing are blue.



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next up previous contents
Next: Model Parameters Up: Calib Tool Previous: Calibrating Arbitrary Stereo Images   Contents
root 2017-09-26