A method is proposed for accessing the inside of outlined contours so as to evaluate density features of the contoured regions while measuring their perimeter and area. Such features are among the most commonly used in biomedical image processing, but for large images their correct evaluation is not straightforward unless to have an adequate amount of main memory available. This is especially true when the components of an image are outlined by methods which do not give rise to simple contours. Compared with other methods, the one we propose requires a much smaller amount of main memory, while remaining enough fast for many purposes.
Luigi P. Cordella,
"A Method For Evaluating Features Of Outlined Components Of An Image", Proc. SPIE 0375, Medical Imaging and Image Interpretation, (1 November 1982); doi: 10.1117/12.934640; https://doi.org/10.1117/12.934640