Effects of Noises in Images used for Height Map Reconstruction of Cartridge Cases using Photometric Stereo

Date

2009-04-11

Author

Ozturk, A. Oguz
Birgul, Ozlem
Esen, Ersin
Sakarya, Ufuk

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

58
views

0
downloads

Photometric stereo (PS) is commonly used in examination of ballistic marks and this stud), investigated the effects of noises present in images on the reconstructed depth map based on PS and the sensitivity of different error measures to different kinds of noises. The images of 3D synthetic objects with known light conditions and Lambert reflection model were calculated first. Thermal noise, Schottky noise and speckle noise with different amplitudes were added to these images. A common effect seen in images, the vignetting effect, was also modelled. Surface normals were calculated using these noisy images and the height maps were reconstructed. Normalized absolute error and normalized gradient error were calculated for all cases and the results were compared.

URI

https://hdl.handle.net/11511/67683

Collections

Department of Aerospace Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Information Theoretic SAR Boundary Detection with User Interaction Demirkesen, Can; Leloğlu, Uğur Murat (2015-09-24) Detection of region boundaries is a very challenging task especially in the presence of noise or speckle as in synthetic aperture radar images. In this work, we propose a user interaction based boundary detection technique which makes use of B-splines and well-known powerful tools of information theory such as the Kullback-Leibler divergence (KLD) and Bhattacharyya distance. The proposed architecture consists of the following four main steps: (1) The user selects points inside and outside of a region. (2) P...
Effects of modulation type on blind SIMO commmunications systems Karakutuk, Serkan; Tuncer, Temel Engin (2007-06-13) In frame based communication systems, blind identification of frame length and offset from limited number of observations has an important affect on the performance of blind channel identification and equalization algorithms. In [1], for guard interval transmission schemes, a novel blind frame length and offset estimation method is proposed. In this paper, the performance of methods proposed in [1] for fixed frame length transmission are studied.
Reflection Phase Characterization of Curved High Impedance Surfaces Durgun, Ahmet Cemal; Birtcher, Craig R. (Institute of Electrical and Electronics Engineers (IEEE), 2013-12-01) Reflection phase characteristics of cylindrically curved high impedance surfaces (HISs) are examined. Due to the non-periodicity of the problem, full wave solutions can be time consuming. To overcome this problem, an approximate semi-analytical method, which assumes a homogenized model for the curved HIS, is developed. The model parameters can be extracted from the reflection properties of the flat HIS. For the cases where only Floquet currents are excited, the reflection phase diagram of a curved HIS is in...
Delay characteristics comparison of coherently coupled high-Q multi-cavity array and single embedded quantum dot cavity systems Kocaman, Serdar; Sayan, Gönül (2017-01-31) The optical analogue to electromagnetically induced transparency (EIT) is modeled for two separate systems with the same formalism and the spectral characteristics together with the generated group delay are compared. First system is a coherently coupled high-Q multi-cavity array which represents the classical EIT and is limited by the finite broadening of the cavity and the second one is a single embedded quantum dot (QD) cavity system, a cavity-QD EIT, that depends on both QD broadening and cavity propert...
Processing forced vibration test records of structural systems using the analytic signal Çelik, Ozan Cem (SAGE Publications, 2020-09-01) This article presents the use of the analytic signal procedure for processing the large volume of structural vibration data recorded in forced vibration tests. The analytic signal facilitates the computationally laborious task of extracting the steady-state amplitude for each response measure of interest from the recorded accelerations throughout the building at each operated frequency of the forced vibration source. The implementation of the signal processing procedure introduced here is illustrated in der...

Citation Formats

A. O. Ozturk, O. Birgul, E. Esen, and U. Sakarya, “Effects of Noises in Images used for Height Map Reconstruction of Cartridge Cases using Photometric Stereo,” 2009, p. 483, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/67683.