Abstract: there has been great advancement in the image processing industries. The diversity applications and its contribution especially in the medical diagnosis, security systems, fault detection and recognition have motivated the growing of the digital image processing. However the image enhancement is massively and extensively stand as the central processing stage highly demanded. Most images taken by medical instruments and astronomical equipment, satellite images, aerial images and even real life photographs suffer from are of low quality and not easy to analyze, poor contrast and noise. it is necessary to enhance the contrast and remove the noise to increase image quality analyze basing on the demand, therefore image enhancement has taken place to improve the image quality and prepare them for analysis and further processing. In this paper we revealed the Fundamental techniques and schemes for enhancement in imaging in Spatial Domain and analyzed them and suggested the best schemes and overview direction to the future researchers at last. Image enhancement techniques improves the quality (clarity) of images for human viewing, removing blurring and noise, increasing contrast, and revealing details. The enhancement technique differs from one field to another according to its objective. The existing techniques of image enhancement can be classified into two categories: spatial domain and frequency domain enhancement.
Keywords: Spatial domain, Frequency domain, Wavelet, Point operation, Neighborhood operations.
Title: Critical Analysis of Image Enhancement Techniques
Author: Benedictor Alexander Nguchu
International Journal of Electrical and Electronics Research
ISSN 2348-6988 (online)
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