1 September 1991 Elimination of systematic error in subpixel accuracy centroid estimation [also Letter 34(11)3347-3348(Nov1995)]
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Optical Engineering, 30(9), (1991). doi:10.1117/12.55947
An analysis of the properties of the centroid method for subpixel accuracy image feature location is presented. This method is free of systematic error if the maximum spatial frequency of the image incident on the image sensor is less than the sensor's sampling frequency. This can be achieved by using a lens aperture setting such that the modulation transfer function cut-off frequency due to diffraction is appropriately small. Both simulation and experimental tests of this prediction are presented for the case of the location of the center lines of the images of projected light stripes in a triangulation-based three-dimensional shape measurement system.
Brian F. Alexander, Kim Chew Ng, "Elimination of systematic error in subpixel accuracy centroid estimation [also Letter 34(11)3347-3348(Nov1995)]," Optical Engineering 30(9), (1 September 1991). http://dx.doi.org/10.1117/12.55947


Error analysis

Modulation transfer functions

Image sensors

Projection systems

Fourier transforms

Charge-coupled devices

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