By default, 'Sensitivity', which is a number between 0 and 1, is set to 0.85. Step 4: Increase Detection SensitivityĬoming back to the chip image, it is possible that at the default sensitivity level all the circles are lower than the internal threshold, which is why no circles were detected. This is similar to the sensitivity control on the motion detectors used in home security systems. A higher 'Sensitivity' value sets the detection threshold lower and leads to detecting more circles. imfindcircles has a parameter 'Sensitivity' which can be used to control this internal threshold, and consequently, the sensitivity of the algorithm. In simple terms it means that the detector's confidence in a certain (circle) detection has to be greater than a certain level before it is considered a valid detection. This happens frequently because imfindcircles is a circle detector, and similar to most detectors, imfindcircles has an internal detection threshold that determines its sensitivity. Note that the outputs centers and radii are empty, which means that no circles were found.
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