in the last few years , face expression measurement has been receiving significant attention mainly due to advancements in areas such as face detection , face tracking and face recognition . for face recognition systems , detecting the locations in two - dimension images where faces are present is a first step to be performed before face expressions can be measured . however , face detection from a 2d image is a challenging task because of variability in imaging conditions , image orientation , pose , presence / absence of facial artefacts facial expression and occlusion . existing efforts to address the shortcomings of existing face recognition systems deal with technologies for creation of three - dimensional models of a human subject &# 39 ; s face based on a digital photograph of the human subject . however , such technologies are computationally intensive nature and susceptible to errors and hence might not be suitable for deployment . an embodiment of the invention describes a method for identifying face expressions of image objects .