Comparison of Correlation Techniques
نویسندگان
چکیده
This paper presents a theoretical and experimental comparison of different forms of SSD and normalised cross-correlation of image neighborhoods. Signal detection theory is used as a framework for analysis of correlation techniques. A sum of squared difference (SSD) of two image neighborhoods is shown to provide an optimal matching measure for tracking and registration in the case fo additive Gaussian noise. Correlation of the image, its gradient magnitude or its Laplacian are discussed. The relations between SSD and Cross Correlation are demonstrated, and different normalisation techniques are described. An experimental comparison is made of SSD, Normalized Cross Correlation, and Zero-Mean normalised cross correlation, in the presence of changes in light level, additive Gaussian noise, and salt-andpepper noise.
منابع مشابه
Comparison Between Different Methods of Feature Extraction in BCI Systems Based on SSVEP
There are different feature extraction methods in brain-computer interfaces (BCI) based on Steady-State Visually Evoked Potentials (SSVEP) systems. This paper presents a comparison of five methods for stimulation frequency detection in SSVEP-based BCI systems. The techniques are based on Power Spectrum Density Analysis (PSDA), Fast Fourier Transform (FFT), Hilbert- Huang Transform (H...
متن کاملEvaluation and Comparison of Qualitative Properties of Lavash Bread Types During Storage by Different Techniques
Background and Objective: The quality of flat breads depends in part on the textural and structural properties of breads during storage. These properties are largely affected by flour quality. This research aimed at evaluating textural and structural properties of Lavash bread types during storage by different techniques, comparing these methods and determination of correlation between their re...
متن کاملQuantification and comparison of bone-specific alkaline phosphatase with two methods in normal and paget’s specimens
Background: Bone-specific alkaline phosphatase (BAP) is synthesized by the osteoblasts and is presumed to be involved in the calcification of bone matrix, though its precise role in the formation process is unknown. The aim of the present study was to measure the BAP activity in Paget's and normal specimens by two different techniques. Methods: Total ALP (TAP) as well as BAP activity-measuring ...
متن کاملRole of social comparison orientation and tendencies in Iranian EFL learners academic achievement
Social Comparison is important as it can be either encouraging or discouraging for the person who makes it. Although studies concerning social comparison in the classroom context abound, few deal with the relationship between the role of social comparison orientation and tendencies in academic achievement in a competition based educational context. Adopting a non- experimental ex-post facto des...
متن کامل