Showing papers on "Periocular Region published in 2011"
TL;DR: The feasibility of using the periocular region as a biometric trait is studied, including the effectiveness of incorporating the eyebrows, and use of side information (left or right) in matching.
Abstract: The term periocular refers to the facial region in the immediate vicinity of the eye. Acquisition of the periocular biometric is expected to require less subject cooperation while permitting a larger depth of field compared to traditional ocular biometric traits (viz., iris, retina, and sclera). In this work, we study the feasibility of using the periocular region as a biometric trait. Global and local information are extracted from the periocular region using texture and point operators resulting in a feature set for representing and matching this region. A number of aspects are studied in this work, including the 1) effectiveness of incorporating the eyebrows, 2) use of side information (left or right) in matching, 3) manual versus automatic segmentation schemes, 4) local versus global feature extraction schemes, 5) fusion of face and periocular biometrics, 6) use of the periocular biometric in partially occluded face images, 7) effect of disguising the eyebrows, 8) effect of pose variation and occlusion, 9) effect of masking the iris and eye region, and 10) effect of template aging on matching performance. Experimental results show a rank-one recognition accuracy of 87.32% using 1136 probe and 1136 gallery periocular images taken from 568 different subjects (2 images/subject) in the Face Recognition Grand Challenge (version 2.0) database with the fusion of three different matchers.
341 citations
TL;DR: This paper uses unsupervised discriminant projection (UDP) to build subspaces on WLBP featured periocular images and gain 100% rank-1 identification rate and 98% verification rate at 0.1% false accept rate on the entire FG-NET database.
Abstract: In this paper, we will present a novel framework of utilizing periocular region for age invariant face recognition. To obtain age invariant features, we first perform preprocessing schemes, such as pose correction, illumination and periocular region normalization. And then we apply robust Walsh-Hadamard transform encoded local binary patterns (WLBP) on preprocessed periocular region only. We find the WLBP feature on periocular region maintains consistency of the same individual across ages. Finally, we use unsupervised discriminant projection (UDP) to build subspaces on WLBP featured periocular images and gain 100% rank-1 identification rate and 98% verification rate at 0.1% false accept rate on the entire FG-NET database. Compared to published results, our proposed approach yields the best recognition and identification results.
164 citations
TL;DR: It is demonstrated that in certain non-ideal conditions encountered in the authors' experiments, the periocular biometrics is superior to iris in the NIR spectrum, and recognition performance of theperiocular region images is comparable to that of face in the visible spectrum.
Abstract: Developing newer approaches to deal with non-ideal scenarios in face and iris biometrics has been a key focus of research in recent years. The same reason motivates the study of the periocular biometrics as its use has a potential of significantly impacting the iris- and face-based recognition. In this paper, we explore the utility of the various appearance features extracted from the periocular region from different perspectives: (i) as an independent biometric modality for human identification, (ii) as a tool that can aid iris recognition in non-ideal situations in the near infra-red (NIR) spectrum, and (iii) as a possible partial face recognition technique in the visible spectrum. We employ a local appearance-based feature representation, where the periocular image is divided into spatially salient patches, appearance features are computed for each patch locally, and the local features are combined to describe the entire image. The images are matched by computing the distance between the corresponding feature representations using various distance metrics. The evaluation of the periocular region-based recognition and comparison to face recognition is performed in the visible spectrum using the FRGC face dataset. For fusion of the periocular and iris modality, we use the MBGC NIR face videos. We demonstrate that in certain non-ideal conditions encountered in our experiments, the periocular biometrics is superior to iris in the NIR spectrum. Furthermore, we also demonstrate that recognition performance of the periocular region images is comparable to that of face in the visible spectrum.
39 citations
TL;DR: The purpose of this article is to review the literature and describe the non‐surgical treatment options, indications and efficacies for non‐melanoma primary eyelid malignancies.
Abstract: The diagnosis and management of periocular cutaneous malignancies are essential components of an ophthalmologist's practice. Skin cancers comprise nearly one-third of newly diagnosed malignancies. Furthermore, the incidence of skin cancer appears to be increasing. Multiple treatment modalities exist for periocular cutaneous malignancy. Surgical extirpation, often with the combined expertise of a Mohs micrographic surgeon, is typically the first line therapy and is often curative in the periocular region, depending on a variety of factors, including tumour histology, specific location, depth of invasion and surgical technique. However, there are instances where a less invasive, non-surgical treatment option is warranted, including patients who are poor surgical risks or those with diffuse disease. The purpose of this article is to review the literature and describe the non-surgical treatment options, indications and efficacies for non-melanoma primary eyelid malignancies.
36 citations
03 Dec 2011
TL;DR: The goal is to convey some of the difficulties in extracting the iris structure in images of the eye characterized by variations in illumination, eye-lid and eye-lash occlusion, defocus blur, motion blur, and low resolution.
Abstract: The face region immediately surrounding one, or both, eyes is called the periocular region. This paper presents an iris segmentation algorithm for challenging periocular images based on a novel iterative ray detection segmentation scheme. Our goal is to convey some of the difficulties in extracting the iris structure in images of the eye characterized by variations in illumination, eye-lid and eye-lash occlusion, defocus blur, motion blur, and low resolution. Experiments on the Face and Ocular Challenge Series (FOCS) database from the U.S. National Institute of Standards and Technology (NIST) emphasize the pros and cons of the proposed segmentation algorithm.
14 citations
TL;DR: The results of this series suggest that nitrous oxide probe cryotherapy for primary periocular basal cell carcinomas up to 8 mm diameter has a recurrence rate of ∼8%.
Abstract: Aim To report the outcome at 5-year follow-up of a defined series of patients with primary periocular basal cell carcinoma treated by cryotherapy using a nitrous oxide probe. Methods A prospective, non-comparative, interventional case series. One hundred primary periocular basal cell carcinomas were treated with a double freeze–thaw cycle nitrous oxide contact cryotherapy probe. Inclusion criteria were clinically well-defined primary periocular basal cell carcinomas with maximum diameter of 8 mm. The main outcome measure was histologically proven recurrence rate at 5-year follow-up. Results Kaplan–Meier survival analysis showed a 5-year recurrence rate of 8%. Cox regression analysis revealed no correlation between tumour site, tumour size, cryotherapy freeze time and recurrence (p=0.60, p=0.86 and p=0.71, respectively). Thirty-six per cent of patients were lost to follow-up at 5 years following treatment. Conclusion The results of this series suggest that nitrous oxide probe cryotherapy for primary periocular basal cell carcinomas up to 8 mm diameter has a recurrence rate of ∼8%. Cryotherapy has certain advantages over surgical removal of tumours of this size in the periocular region, but careful follow-up is advisable.
13 citations
TL;DR: Periocular tinea should be considered in the differential diagnosis for periocular inflammation, especially in those patients refractory to therapy for more common conditions, because superficial fungal infections on the face are often misdiagnosed.
Abstract: Objective To present the common features of periocular tinea to aid physicians in future diagnosis and therapy of this condition, because superficial fungal infections on the face are often misdiagnosed owing to the diverse morphologies that they manifest. This is especially true of dermatophytoses involving the periocular region. Methods A retrospective review was performed of patients with a diagnosis of periocular tinea who were seen between January 2003 and September 2009 in the pediatric dermatology clinic at St. Louis Children's Hospital. Results Ten cases of periocular tinea were identified (6 male patients and 4 female patients). Common features included prolonged misdiagnosis (all 10 cases), a normal ophthalmologic examination (all 10 cases), and inappropriate corticosteroid application (7 cases). Loss of the eyelashes occurred in all 10 patients. No cases had evidence of other tinea infections on examination. Only 2 cases had the central clearing classically associated with tinea corporis. Seven patients had a potassium hydroxide preparation and/or culture positive for fungal elements. Lesions improved with topical and oral antifungal treatment in all cases, and patients were able to regrow their eyelashes. Conclusion Periocular tinea should be considered in the differential diagnosis for periocular inflammation, especially in those patients refractory to therapy for more common conditions. Loss of the eyelashes is characteristic of these fungal infections, similar to the hair loss that occurs in kerions associated with tinea capitis.
13 citations
TL;DR: In both experiments, eyelashes were reported to be the most helpful feature in how humans analyze periocular images, and this work considered multiple factors in forming different-subject pairs.
12 citations
TL;DR: The precise control of tissue ablation with minimal thermal damage makes the erbium:YAG laser an ideal tool for the treatment of the delicate periocular region where even minimal scarring can result in ocular complications.
Abstract: Milia en plaque in the periocular region represent a cosmetically disturbing skin condition of unknown origin characterized by numerous tiny milia grouped around the inner canthus and the medial aspect of both eyelids. While conservative treatment and manual expression often result in local recurrence, invasive approaches harbor the risk of mechanical or thermal injury of periocular skin and lid margins. A 32-year-old female patient with refractory periocular milia was treated with the erbium:YAG laser and followed-up for 12 months. Ablative laser treatment led to nearly complete resolution of the milia and an excellent clinical result. Importantly, no scarring, dyspigmentation or ocular complications were noted. This report demonstrates the efficacy and safety of erbium:YAG laser ablation of periocular milia. The precise control of tissue ablation with minimal thermal damage makes the erbium:YAG laser an ideal tool for the treatment of the delicate periocular region where even minimal scarring can result in ocular complications.
11 citations
01 Jan 2011
TL;DR: A working knowledge of what is perceived as beautiful in the periocular area is critical to the successful evaluation, counseling, and management of patients with cosmetic eyelid and periorbital concerns.
Abstract: Appearances of the eye and periocular region are essential features of the face which are significant to the perception of facial beauty. The general concepts of symmetry, averageness, and feature size, provide the framework upon which the oculofacial surgeon assesses and can then plan surgical intervention on specific periocular anatomic features. Skin quality, as well as the proportions of the eyelids, brows, and midface, must be evaluated, with consideration given to patient age, ethnicity, gender, and expectations. A working knowledge of what is perceived as beautiful in the periocular area is critical to the successful evaluation, counseling, and management of patients with cosmetic eyelid and periorbital concerns.
10 citations
Patent•
27 Jun 2011
TL;DR: In this article, a device for the stimulation of the visual system includes a body having a pair of spaced lobes configured to conform to the periocular region, and a light emitting source disposed within each of the pair of lobes to selectively illuminate the perocular region.
Abstract: A device for the stimulation of the visual system includes a body having a pair of spaced lobes configured to conform to the periocular region The body has a first side and an opposed second side The body second side has an adhesive layer for securing the body to the periocular region A light emitting source disposed within each of the pair of lobes to selectively illuminate the periocular region
TL;DR: Split-thickness skin grafts represent a good reconstruction technique if other tissue from the periocular region is not available or whenever other surgical methods appear to be less promising or inapplicable as discussed by the authors.
Abstract: Oculoplastic surgery has to consider the specific characteristics of the periocular region and possible resulting functional consequences. Motility of eyelids, limited skin thickness with excellent wound healing conditions, lacrimal duct system and eyelid ligaments are important criteria for the individual choice of the surgical procedure. The use of split-thickness skin grafts represents an established method to repair periocular defects. Important medical conditions for split-thickness transplantation are colour of the skin, skin structure, photodamage of the skin, hair growth and other degenerative disorders. The recipient area should be treated as carefully as possible with diathermia until the bare area is completely dry. It is important that the size of the graft is slightly larger than the area to be covered because of postoperative shrinking. Small grafts tend to result in contraction which may lead to a defective position of the eyelids. For postoperative wound maintenance, gauze containing vaseline and wool wax can be used. This helps to keep the graft smooth and to prevent its detachment upon changes of dressing. Frequency and scope of complications are similar to flap surgery if adequate individual indications for split-thickness skin grafts are considered. Early onset complications are wound dehiscence, bleeding, formation of seroma, dislocation or loss of grafted skin. The postoperative maintenance of the donor site can be managed successfully with hydrocolloid dressing. Split-thickness skin grafts represent a good reconstruction technique if other tissue (full-thickness skin) from the periocular region is not available or whenever other surgical methods appear to be less promising or inapplicable. If available, ipsi- or contralateral full-thickness skin grafts are preferred because of the same skin type.