الفهرس 
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Abstract
Recent developments in materials science have produced a wide variety of advanced composites and engineered materials. As materials become more sophisticated, the processes used to produce these materials these materials become more complicated and less forgiving than conventional methods of processing. so, tight control of the processing parameters is typically required. Nowadays more reliable and more accurate techniques are available that could fulfill the roll of a verification system much better.
Today a ceramic may be defined as a product manufacturing by the heat treatment of a material, which is inorganic and non-metallic. Ceramic tile is one of the most important and ancient mateials to cover floors and walls. The worldwide production and consumption of ceramic tiles has increased.The tiles are sorted to eliminate defective tiles and separate the higher quality tiles from those of lower quality as well as to divide them into homogeneous groups according to work size and shade. Non-destructive testing becomes more and more important with respect to quality management systems and material modeling. There are at least two reasons why non-destructive testing is getting more and more attention. One driving force comes from industry which is interested in quality management systems, the other driving force comes from research where tools are needed which allow to look into a material rather onto a surface only.
It will be useful tool for quality management and will enhance the application of ceramic tiles manufacturing. it is needed for characterizing and sorting raw materials, for controlling the manufacturing process, and for determining the quality of semi-finished or final products. The improvement of product`s quality based on objective and quantitative tolerances loads to an increase in customer satisfaction and confidence.
Defects detection is still based on the judgment of human operators while most of the other manufacturing activities are automated. However, checking surface defects on line is a difficult task because of environment and process characteristics. Tiles are moved from the oven to sorting locations, at speeds ranging from 40 to 50 pieces per minute depending on size, and operators have a very limited time to make decisions. people can work effectively for short periods and many different operators are involved in checking the same batch of tiles. Continuity over time is not guaranteed and may result in overall poor quality, which may cause customers to complain or even to reject the batch.
Quality control in ceramic the manufacturing is hard, albor intensive and it is performed in a harsh industrial environment with noise, extreme temperature and humidity. It can be divided into color analysis, dimension verification, and surface defect detection which is the main purpose of our research.