Face Recognition Based on Statistical Texture Features

Facial recognition has attracted the attention of researchers and has been one of the most prominent topics in the fields of image processing and pattern recognition since 1990. This resulted in a very large number of recognition methods and techniques with the aim of increasing the accuracy and robustness of existing systems. Many techniques have been developed to address the challenges and reliable recognition systems have been reached but require considerable processing time, suffer from high memory consumption and are relatively complex. The focus of this paper is on extracting subset of descriptors (less correlated and less calculations) from the co-occurrence matrix with the goal of enhancing the performance of Haralick’s descriptors. Improvements are achieved by adding the image pre-processing and selecting the proper method according to the database problem and by extracting features from image local regions

PENGENALAN CITRA WAJAH DENGAN VARIASI ILUMINASI MENGGUNAKAN PRA-PEMROSESAN TAN AND TRIGGS DAN METODE KLASIFIKASI ROBUST REGRESSION

Abstrak. Pengenalan citra wajah dengan variasi iluminasi dianggap sebagai salah satu masalah penting di bidang pengenalan wajah karena variasi yang disebabkan oleh pencahyaan lebih signifikan dari pada ciri fisik wajah individu sendiri. Salah satu pendekatan untuk memecahkan masalah ini  adalah dengan metode klasifikasi Robust Regression. Dalam penelitian ini metode Robust Regression dengan menggunakan teknik pra pemrosesan Tan and Triggs (TT)  dapat menghasilkan kinerja yang cukup handal. Pengujian dilakukan dengan menggunakan 2 basisdata standar yaitu CMU-PIE dan Yale Face B. Berdasarkan uji coba yang dilakukan, penggunaan pra pemrosesan TT pada robust regression menghasilkan tingakat akurasi yang lebih unggul daripada penggunaan pra pemrosesan Histogram Equalization (HE). Pada CMU PIE Face Database pencahayaan frontal dengan pra proses  HE akurasi sebesar 97,30% sedangkan dengan TT akurasi sebesar 97,82%. Pada kondisi pencahayaan ekstrim akurasi yang diperoleh HE sebesar 99,66% sedangkan TT sebesar 100%. Selain itu, dari hasil uji coba database lain yaitu dengan Yale Face Database B 50x50 akurasi menggunakan HE sebesar 84,7 % sedangkan dengan TT sebesar 93,95%.   Kata Kunci: Pengenalan Wajah, Normalisasi Iluminasi, Robust Regression, Tan and Triggs

Enhanced face detection framework based on skin color and false alarm rejection

Fast and precise face detection is a challenging task in computer vision. Human face detection plays an essential role in the first stage of face processing applications such as recognition tracking, and image database management. In the applications, face objects often come from an inconsequential part of images that contain variations namely different illumination, pose, and occlusion. These variations can decrease face detection rate noticeably. Besides that, detection time is an important factor, especially in real time systems. Most existing face detection approaches are not accurate as they have not been able to resolve unstructured images due to large appearance variations and can only detect human face under one particular variation. Existing frameworks of face detection need enhancement to detect human face under the stated variations to improve detection rate and reduce detection time. In this study, an enhanced face detection framework was proposed to improve detection rate based on skin color and provide a validity process. A preliminary segmentation of input images based on skin color can significantly reduce search space and accelerate the procedure of human face detection. The main detection process is based on Haar-like features and Adaboost algorithm. A validity process is introduced to reject non-face objects, which may be selected during a face detection process. The validity process is based on a two-stage Extended Local Binary Patterns. Experimental results on CMU-MIT and Caltech 10000 datasets over a wide range of facial variations in different colors, positions, scales, and lighting conditions indicated a successful face detection rate. As a conclusion, the proposed enhanced face detection framework in color images with the presence of varying lighting conditions and under different poses has resulted in high detection rate and reducing overall detection time