Some Techniques for Image Enhancement, Edge Detection and Smoothing

Abstract

Any image processing technique, such as enhancement, edge detection, smoothing etc. should incorporate the respense function of human visual system. A transfer function has been developed here using the property that the brightness perceived by human visual system follows a logarithmic response to light intensity incident on eye. For edge detection, a space-variant thresholding function has been found using the same property. Also, a weighted neighbourhood averaging technique has been developed to remove noise, where weighting co-efficient is obtained considering the homogeneity of neighbouring area.

Indexing Terms:

• Digital Image Processing
• Human Visual System
• Enhancement
• Edge Detection
• Noise Smoothing