All Outputs (91)

Gender recognition from facial images: Two or three dimensions? (2016)
Journal Article
Zhang, W., Smith, M. L., Smith, L. N., & Farooq, A. (2016). Gender recognition from facial images: Two or three dimensions?. Journal of the Optical Society of America A, 33(3), 333-344. https://doi.org/10.1364/JOSAA.33.000333

© 2016 Optical Society of America. This paper seeks to compare encoded features from both two-dimensional (2D) and three-dimensional (3D) face images in order to achieve automatic gender recognition with high accuracy and robustness. The Fisher vecto... Read More about Gender recognition from facial images: Two or three dimensions?.

Ptu-024 - photometric stereo reconstruction for surface analysis of mucosal tissue (2015)
Journal Article
Poullis, A., Groves, C., Slabaugh, G., Emrith, K., & Smith, M. (2015). Ptu-024 - photometric stereo reconstruction for surface analysis of mucosal tissue. BMJ, 64(1), 68-69

This paper provides a novel approach for real-time detection of polyps. Using a photometric stereo sensor for endoscopy imaging in a porcine model, the 3D surface geometry of a porcine gut is recovered. Shape features are extracted from the 3D surfac... Read More about Ptu-024 - photometric stereo reconstruction for surface analysis of mucosal tissue.

A 3D machine vision method for non-invasive assessment of respiratory function (2015)
Journal Article
Smith, L. N., Smith, M. L., Fletcher, M. E., & Henderson, A. J. (2016). A 3D machine vision method for non-invasive assessment of respiratory function. International Journal of Medical Robotics and Computer Assisted Surgery, 12(2), 179-188. https://doi.org/10.1002/rcs.1669

Copyright © 2015 John Wiley & Sons, Ltd. Background: Respiratory function testing is important for detecting and monitoring illness, however, it is difficult for some patients, such as the young and severely ill, to perform conventional tests that... Read More about A 3D machine vision method for non-invasive assessment of respiratory function.

Combination of 3D skin surface texture features and 2D ABCD features for improved melanoma diagnosis (2015)
Journal Article
Ding, Y., John, N. W., Smith, L., Sun, J., & Smith, M. (2015). Combination of 3D skin surface texture features and 2D ABCD features for improved melanoma diagnosis. Medical and Biological Engineering and Computing, 53(10), 961-974. https://doi.org/10.1007/s11517-015-1281-z

© 2015, International Federation for Medical and Biological Engineering. Two-dimensional asymmetry, border irregularity, colour variegation and diameter (ABCD) features are important indicators currently used for computer-assisted diagnosis of malign... Read More about Combination of 3D skin surface texture features and 2D ABCD features for improved melanoma diagnosis.

Testing the validity of Lambert's law for micro-scale photometric stereo applied to paper substrates (2015)
Presentation / Conference
Azhar, F., Emrith, K., Pollard, S., Smith, M., Adams, G., & Simske, S. (2015, March). Testing the validity of Lambert's law for micro-scale photometric stereo applied to paper substrates. Paper presented at 10th International Conference on Computer Vision Theory and Applications (VISIGRAPP 2015), Berlin, Germany

This paper presents an empirical study to investigate the use of photometric stereo (PS) for micro-scale 3D measurement of paper samples. PS estimates per-pixel surface orientation from images of a surface captured from the same viewpoint but under d... Read More about Testing the validity of Lambert's law for micro-scale photometric stereo applied to paper substrates.

A photometric stereo approach for chronic wound measurement (2015)
Journal Article
Smith, M. L., Farooq, A. R., Smith, L. N., Sun, J., Xu, X., Farooq, A., …smith, M. (2015). A photometric stereo approach for chronic wound measurement. Sensor Review, 35(4), 419-424. https://doi.org/10.1108/SR-01-2015-0018

© 2015 © Emerald Group Publishing Limited. Purpose-This paper aims to review state of the art of techniques for dimensioning chronic wounds, and validate the possibilities of employing a new proposed optical imaging approach for general task of wound... Read More about A photometric stereo approach for chronic wound measurement.

Long-range concealed object detection through active covert illumination (2015)
Journal Article
Williamson, D. R., Hales, I. J., Hansen, M. F., Broadbent, L., & Smith, M. (2015). Long-range concealed object detection through active covert illumination. Proceedings of SPIE, 9648, https://doi.org/10.1117/12.2190194

© 2015 SPIE. When capturing a scene for surveillance, the addition of rich 3D data can dramatically improve the accuracy of object detection or face recognition. Traditional 3D techniques, such as geometric stereo, only provide a coarse grained recon... Read More about Long-range concealed object detection through active covert illumination.

An improved photometric stereo through distance estimation and light vector optimization from diffused maxima region (2014)
Journal Article
Ahmad, J., Sun, J., Smith, L., & Smith, M. (2014). An improved photometric stereo through distance estimation and light vector optimization from diffused maxima region. Pattern Recognition Letters, 50, 15-22. https://doi.org/10.1016/j.patrec.2013.09.005

© 2013 Elsevier B.V. All rights reserved. Although photometric stereo offers an attractive technique for acquiring 3D data using low-cost equipment, inherent limitations in the methodology have served to limit its practical application, particularly... Read More about An improved photometric stereo through distance estimation and light vector optimization from diffused maxima region.

Photometric stereo reconstruction for surface analysis of mucosal tissue (2014)
Presentation / Conference
Emrith, K., Slabaugh, G., Poullis, A. P., Goves, C., & Smith, M. (2014, July). Photometric stereo reconstruction for surface analysis of mucosal tissue. Paper presented at Medical Image Understanding and Analysis 2014, City University London

We introduce photometric stereo reconstruction for surface analysis of mucosal tissue. Photometric stereo captures images of a surface from a single camera, but illuminated from different light sources. From the set of images, a detailed surface rec... Read More about Photometric stereo reconstruction for surface analysis of mucosal tissue.

Non contact pulmonary functional testing through an improved photometric stereo approach (2014)
Presentation / Conference
Ahmad, J., Sun, J., Smith, L., & Smith, M. (2014, July). Non contact pulmonary functional testing through an improved photometric stereo approach. Paper presented at Medical Image Understanding and Analysis 2014, City University London

A non-contact computer vision based system is developed for Pulmonary Functional Testing. The unique and novel features of the system are that it views the patients from both front and back and creates a 3D structure of the whole torso. By observing... Read More about Non contact pulmonary functional testing through an improved photometric stereo approach.

A novel photometric stereo imaging sensor for endoscopy imaging: Proof of concept studies on a porcine model (2014)
Journal Article
Poullis, A., Groves, C., Slabaugh, G., Emrith, K., & Smith, M. (2014). A novel photometric stereo imaging sensor for endoscopy imaging: Proof of concept studies on a porcine model. Gut, 63(S1), A46-A47. https://doi.org/10.1136/gutjnl-2014-307263.96

The American Society of Gastroenterology Endoscopy led Preservation and Incorporation of Valuable Endoscopy Innovations initiative has identified real time poly diagnosis as one of the next major technology driven changes in endoscopy (1). A number o... Read More about A novel photometric stereo imaging sensor for endoscopy imaging: Proof of concept studies on a porcine model.

Paper type classification based on a new 3D surface texture measure (2014)
Journal Article
Malekmohamadi, H., Emrith, K., Pollard, S., Adams, G., Smith, M., & Simske, S. (2014). Paper type classification based on a new 3D surface texture measure. Electronics Letters, 50(8), 596-598. https://doi.org/10.1049/el.2013.2687

A novel three-dimensional (3D) surface texture measure (3DSTM) is presented based on the micro-geometry of paper surfaces to classify different paper substrates. This is useful to automatically determine whether a document is printed on the correct p... Read More about Paper type classification based on a new 3D surface texture measure.

Using nasal curves matching for expression robust 3D nose recognition (2013)
Presentation / Conference
Emambakhsh, M., Evans, A., & Smith, M. (2013, September). Using nasal curves matching for expression robust 3D nose recognition. Paper presented at IEEE Conference on Biometrics: Theory, Applications and Systems (BTAS2013), Washington DC, USA

The development of 3D face recognition algorithms that are robust to variations in expression has been a challenge for researchers over the past decade. One approach to this problem is to utilize the most stable parts on the face surface. The nasa... Read More about Using nasal curves matching for expression robust 3D nose recognition.

BRDF estimation for faces from a sparse dataset using a neural network (2013)
Presentation / Conference
Hansen, M. F., Atkinson, G., & Smith, M. (2013, August). BRDF estimation for faces from a sparse dataset using a neural network. Paper presented at Computer Analysis of Images and Patterns, CAIP 2013, York, UK

We present a novel �ve source near-infrared photometric stereo 3D face capture device. The accuracy of the system is demonstrated by a comparison with ground truth from a commercial 3D scanner. We also use the data from the �ve captured images to mo... Read More about BRDF estimation for faces from a sparse dataset using a neural network.

Face recognition and verification using photometric stereo: The photoface database and a comprehensive evaluation (2013)
Journal Article
Smith, L. N., Smith, M. L., Hansen, M. F., Atkinson, G. A., Zafeiriou, S., Atkinson, G., …Smith, L. (2013). Face recognition and verification using photometric stereo: The photoface database and a comprehensive evaluation. IEEE Transactions on Information Forensics and Security, 8(1), 121-135. https://doi.org/10.1109/TIFS.2012.2224109

This paper presents a new database suitable for both 2-D and 3-D face recognition based on photometric stereo (PS): the Photoface database. The database was collected using a custom-made four-source PS device designed to enable data capture with mini... Read More about Face recognition and verification using photometric stereo: The photoface database and a comprehensive evaluation.

Multidimensional imaging for skin tissue surface characterization (2013)
Journal Article
Sun, J., & Smith, M. (2013). Multidimensional imaging for skin tissue surface characterization. Computers in Industry, 64(9), 1383-1389. https://doi.org/10.1016/j.compind.2013.06.004

Human skin, the outer and largest organ covering our body, can be described in terms of both its 3D spatial topography and its 2D spectral reflectance. Such a characterization normally requires the application of separate procedures using different k... Read More about Multidimensional imaging for skin tissue surface characterization.

Recovering skin reflectance and geometry for diagnosis of melanoma (2013)
Book Chapter
Sun, J., Liu, Z., Ding, Y., & Smith, M. (2013). Recovering skin reflectance and geometry for diagnosis of melanoma. In J. Scharcanski, & E. Celebi (Eds.), Computer Vision Techniques for the Diagnosis of Skin Cancer (243-265). UK: Springer

In order to achieve an early detection of skin cancers, various state-of-the-art imaging modalities have been investigated from optical, impedance, biomechanical and physiological perspectives to find out the potential biomarkers. However multilayere... Read More about Recovering skin reflectance and geometry for diagnosis of melanoma.

Incorporating clinical metadata with digital image features for automated identification of cutaneous melanoma (2013)
Journal Article
Liu, Z., Sun, J., Smith, M., & Smith, L. (2013). Incorporating clinical metadata with digital image features for automated identification of cutaneous melanoma. British Journal of Dermatology,

Abstract Background Computer-assisted diagnosis (CAD) of malignant melanoma (MM) has been advocated to help clinicians in achieving a more objective and reliable assessment. However, conventional CAD systems only examine the features extracted from... Read More about Incorporating clinical metadata with digital image features for automated identification of cutaneous melanoma.

Real-time recovery of moving 3D faces for emerging applications (2013)
Journal Article
Molleda, J., Smith, M. L., Smith, L. N., Broadbent, L., Emrith, K., Emrith, K., …Molleda, J. (2013). Real-time recovery of moving 3D faces for emerging applications. Computers in Industry, 64(9), 1390-1398. https://doi.org/10.1016/j.compind.2013.03.011

Existing face imaging systems are not suitable to meet the face representation and recognition demands for emerging applications in areas such as interactive gaming, enhanced learning environments and directed advertising. This is mainly due to the p... Read More about Real-time recovery of moving 3D faces for emerging applications.

Robust 3D face capture using example-based photometric stereo (2013)
Journal Article
Smith, M. L., Atkinson, G. A., Leitão, H. C., Saracchini, R. F., Saracchini, R., Stolfi, J., …Smith, M. (2013). Robust 3D face capture using example-based photometric stereo. Computers in Industry, 64(9), 1399-1410. https://doi.org/10.1016/j.compind.2013.04.003

We show that using example-based photometric stereo, it is possible to achieve realistic reconstructions of the human face. The method can handle non-Lambertian reflectance and attached shadows after a simple calibration step. We use spherical harmon... Read More about Robust 3D face capture using example-based photometric stereo.