each region 142 in fig1 the features that are measured are the following the width of the region width corresponds to the width of a rectangle surrounding the region under consideration 144 in fig1 the width of the rectangle is computed as the difference of the maximum x coordinate minus the minimum x coordinate the area that the region occupies this is the area occupied by a rectangle surrounding the region under consideration 144 in fig1 measured in square pixels the width of the rectangle is computed as the difference of the maximum x coordinate minus the minimum x coordinate and the height of the rectangle is computed as the difference of the maximum y coordinate minus the minimum y coordinate the area equals the product of width by the height of the rectangle the magnitude of the region this is the count of the non white pixels nnw of the connected region and is measured in pixels the plenitude of a region this measure indicates how full the region under consideration is for example a region containing gaps will have less plenitude in relation with a region not having gaps the plenitude of a region is defined as the ratio of the area to the magnitude features defined above the aspect ratio of a rectangle surrounding the region under consideration 143 in fig1 the region under test is surrounded by a rectangle the ratio of this rectangles height to the rectangles width gives the aspect ratio of that region number of scan lines intersection points several u201c virtual u201d lines of 1 pixel thickness are considered that intersect the region at different heights 144 in fig1 the system records the number of pixels that each scan.