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We present a method for locating circles in images based on the moment values of specially-constructed functions. Our approach differs from Hough-transform-type approaches in requiring no large accumulator array, searching operation, nor preliminary edge-detection step. It differs from previous work on curve location by moments by the existence of an explicit formula for the circle parameters and...
Curve parametrization is the task of determining the parameters of a general curve equation describing a structure in an image (or a surface in a higher-dimensional dataset). A common example is the widespread use of the Hough transform to determine parameters of straight lines in an image. Moment-based methods offer an attractive alternative to Hough-type methods for this task, especially as the...
We present a method of locating edges in JPEG-coded images which operates in frequency space on the DCT coefficients. Applied to the quantized DCT coefficients of a block containing a straight edge, the method yields an equation for the edge in a fraction of the operations needed to dequantize and transform the coefficents to pixel values. As a sample application of this method, we present a technique...
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