Chessboard Tile Size If no level is already present then a chessboard segmentation is undertaken to generate a set of large objects which are iterated through during the segmentation process. Minimum Threshold The minimum grey-level value that will be considered for splitting Maximum Threshold The maximum grey-level value that will be considered for splitting. Step Size The sizes of the steps the algorithm will use to move from the minimum threshold to the maximum threshold. Large values will make the algorithm quicker to calculate but smaller values will tend to produce better results. Stepping Type Either: Add– Calculate each step by adding the value in the scan step field. Multiply– Calculate each step by multiplying by the value in the scan step field. Image Layer The image layer where on which the algorithm will be applied. Class for Bright Objects The class the brighter objects (above the threshold) will be given. Class for Dark Objects The class the darker objects (below the threshold) will be given. Contrast Mode The method the algorithm uses to calculate contrast between bright and dark objects. The algorithm uses the mean of possible bright borderpixels and the mean of possible dark border pixels to calculate either the edge ratio or edge difference which can be used to define the contrast between two objects. Alternatively, the object mean (of all pixels) within the bright and dark pixels can be used. Execute Splitting If yes objects will be split while if no only the threshold value will be calculated. Best Threshold A variable (see units 8) to store the threshold that maximises the contrast. Best Contrast A variable to store the best contrast calculated. Minimum Rel. Area Dark The minimum (relative) area identified as dark objects for the segmentation to be performed. Range 0-1. Minimum Rel. Area Bright The minimum (relative) area identified as bright objects for the segmentation to be performed. Range 0-1. Minimum Contrast The minimum contrast threshold for the segmentation to occur. Minimum Object Size The minimum object size for the segmentation to take place.
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