Multi-touch out-focus: A realization of SLR-like narrow DOF in mobile camera

Most of the mobile cameras support digital zoom but not the optical zoom. As a result, capturing images at narrow depth-of-field (DOF) is not possible. SLR cameras can capture such images with the help of optical zoom using multiple lens assembly. In this paper, we propose a technique to create SLR-like narrow DOF images using multiple frames focused at different regions or depths. The proposed method identifies the regions or objects focused in different frames and do necessary blurring or sharpening to virtually reduce the DOF of the image. A wavelet transform based information measure has been used to separate focused and de-focused regions in a single frame and also to identify a frame which is best focused in a specific region. The proposed solution will allow the users to create narrow DOF at single or multiple user specified points in a single image.