Digital Image Processing (using Java)

public abstract void computeMapping(int low, int high);public BufferedImage filter(BufferedImage src, BufferedImage dest) {checkImage(src);if (dest == null)dest = createCompatibleDestImage(src, null);LookupOp operation = new LookupOp(new ByteLookupTable(0, table), null);operation.filter(src, dest);return dest;}}(p.117)LISTING 6.4 A subclass of GreyMapOp that applies a linear grey level mappingfunction to an image.public class LinearOp extends GreyMapOp {public LinearOp() {}computeMapping();public LinearOp(int low, int high) {}computeMapping(low, high);public void computeMapping(int low, int high) {if (low < 0 || high > 255 || low >= high)throw new java.awt.image.ImagingOpException("invalid mapping limits");float scaling = 255.0f / (high - low);for (int i = 0; i < 256; ++i)setTableEntry(i, Math.round(scaling*(i - low)));}}- 24 -