identity of interest 4 sketch to photo Cascaded feature extraction 2 Difference of Gaussian 2 Feature extraction 2 Image matching 2 RECOGNITION 2 deep learning 2 image matching 2 local feature extraction 2 oriented gradient histogram 2 static and dynamic 2 Automatic identification 1 Automation 1 Chinese universities 1 Criminal investigation 1 Deep learning 1 Difference of gaussian 1 Dogs 1 Extraction 1 Face 1 Gaussian distribution 1 Graphic methods 1 Histograms 1 IMAGE 1 Identity of Interest 1 Image processing 1 Lighting 1 Local feature extraction 1 Mouth 1