International Journal of Engineering and Technology

Phase unwrapping (PU) is the process of recovering the absolute phase ? from the wrapped phase ? and it is key problem in interferometry SAR processing (In-SAR) and Sonar (In-SAS), MRI (medical imaging) & signal processing applications, etc. In all these applications the observation mechanism is an absolute phase (2p-periodic function of the true phase). PEARLS is an algorithm which attain absolute phase using two steps: the first step is to de-noise the wrapped phase by using the LPA-ICI algorithm and the next to unwrap phase by using global phase unwrapping algorithm. PEARLS algorithm is able to reconstruct any noisy phase with high resolution. However, computation speed and memory consumption often times limits the effective use of PEARLS especially for large images. To overcome this drawback we have proposed two faster algorithms. The first one is I-PEARLS, which reduce the complexity of the PEARLS algorithm to attain speed and the other is the G-PEARLS which uses the cache efficient techniques while unwrapping the phase. Proposed algorithms are described in detail and tested on simulated and real images (interferometry SAR data). Results show that the proposed algorithm works faster and suggested alternative to the PEARLS algorithm.