chain code dental x-ray moore songket BPNN CBIR CT-scan Fundus Image Gaussian Filter Histogram Equalization Microaneursym Multiple Morphology Gradient binary cropping depth image dilation erosion extraction feature featured region gradient histogram image color segmentation incision brain injury kinect level of severity low back pain mathematical morphology morphology multiple morphological gradient (mMG) neuron otsu precision value proximal caries recall value straight leg raise volume area