Abstract: A method and apparatus for analyzing two-dimensional structures to obtain three-dimensional quantitative information therefrom includes a video camera, a digitizing board for transforming video image output signals from the video camera into digital data, and a computer for analyzing the digitized video image data. Regions of interest or desired objects in the video image corresponding to the video image data are observed by an operator. Thresholding commands are supplied to the computer instructing the computer to manipulate the digitized video image data to enhance or distinguish the regions of interest from other areas in the video image. Once sufficient thresholding is accomplished, the computer executes an algorithm that identifies the regions of interest, draws a solid line around them, and sets all of the video image data defining each region of interest bounded by a solid line to a predetermined threshold value.