Optimal number of pixels in reconstructed images in electrical tomography

The number of pixels in reconstructed images plays an important part in electrical tomography applications. But so far there is none efficient method to determine the optimal number of pixels in reconstructed images in electrical tomography. In this paper we propose a general index based on maximizing grey differences between investigated objectives and background. The proposed index has a robust maximum without any additional condition and can be encountered in all imaging applications. Experimental results demonstrate that the proposed index is suitable for comprehensive determination of number of pixels and the imaging results are consistent with visual perception.