With increasing use of two-dimensional echocardiograms (2DE) for diagnosis [1, 2], efforts to computerize the process of quantification of cardiac parameters have increased. Visual processing of echocardiograms is time and labor intensive, and usually provides qualitative results with subjective variations [3]. In contrast, computer assisted methods are efficient and provide quantitative reproducible results. On the basis of the extent of computer usage, the 2DE processing methods are classified into three categories, namely, manual [9-30], interactive [32-49], and automatic methods [51-82]. This work is a structured survey of the published research on these three categories.

We propose scale independent geometric models to recognize and correct freehand geometric line sketches. The models are defined as compositions of a set of primitives that account for freehand drawing approximations. The recognized sketches are corrected to their precise geometric shapes.

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