Impact of Thatcher effect, Double Illusion and Inversion on face recognition
Nadjet Radji, Dalila Cherifi, Arab Azrar · 2015
Thatcher effect or Thatcher illusion is a phenomenon where it becomes difficult to detect local feature changes in an upside down face, despite identical changes being obvious in an upright face. In the Thatcher illusion, in which the eyes and mouth are inverted relative to the rest of the face, looks grotesque when shown upright but not when inverted. Face double illusion is formed by replicating the eyes and mouth below the originals. Inversion can be obtained by rotating the image vertically (upside down) and horizontally, or flip it right and left. So, in this paper, we evaluate the consequence of Thatcher effect, Double Illusion and Inversion (Upside down, Horizontal, Right and Left) on the performance of face recognition system based on Principal Component Analysis (PCA), Singular Value Decomposition (SVD), Discrete Wavelet Decomposition (DWT), Discrete Cosine Transform (DCT), application of DWT prior SVD (DWT-SVD) and application of DWT prior PCA (DWTPCA). The evaluation is carried on the FEI database using the Recognition Rate (RR) criterion.