code: public void process() {
          width = sourceImage.getWidth();
          height = sourceImage.getHeight();
          picsize = width * height;
          initArrays();
          readLuminance();
          if (contrastNormalized)
              normalizeContrast();
          computeGradients(gaussianKernelRadius, gaussianKernelWidth);
          int low = Math.round(lowThreshold * MAGNITUDE_SCALE);
          int high = Math.round(highThreshold * MAGNITUDE_SCALE);
          performHysteresis(low, high);
          thresholdEdges();
          writeEdges();
      }
docs: methods