Text present in image provides important information for automatic annotation, indexing and retrieval. Therefore, its extraction is a well known research area in computer vision. However, variations of text due to differences in orientation, alignment, font, size, low image contrast and complex background make the problem of text extraction extremely challenging. In this paper, we propose a texture-based text extraction method using DWT with K-means clustering. First, the edges are detected from image by using DWT. Then, a small size overlapped sliding window is used to scan high frequency component sub-bands from which texture features of text and non-text regions are extracted. Based on these features, K-means clustering is employed to classify the image into text, simple background and complex background clusters. Finally, voting decision process and area based filtering are used to locate text regions exactly. Experimentation is carried out using public dataset ICDAR 2013 and our own dataset for English, Hindi and Punjabi text images for different number of clusters. The results show that the proposed method gives promising results with different languages in terms of detection rate (DR), precision rate (PR) and recall rate (RR).
The gingiva, also known as the gums, is the pink-coloured keratinized mucosa that surrounds and protects the teeth. Gingival enlargement or gingival overgrowth, a common trait of gingival disease, is characterized by an increase in the size of gingiva. Irritation fibroma is an exophytic soft tissue mass in the oral mucosa. Indeed, it is not a real neoplasm, but a focal hyperplasia of fibrous connective tissue induced by local trauma or chronic irritation. Pyogenic granuloma is one of the inflammatory hyperplasia seen in the oral cavity, majority are found on the marginal gingiva with only 15% of the tumours on the alveolar part. It predominantly occurs in the second decade of life in young females, male to female ratio is 1:99, and size of lesion varies in diameter from few millimetres to several centimetres. This article presents a case of pyogenic granuloma in an 6year old boy who presented with a gingival overgrowth in his mandibular left buccal surface region i.r.t 31 including marginal and attached gingiva. He had discomfort during mastication, interferes with occlusion there was episode of bleeding during brushing. The lesion was excised and histopathological report confirmed the diagnosis. Case was followed up for six months and no recurrence of the lesion. Etiological factors, clinical features, differential diagnosis and different treatment options are discussed based on the review of current literature available.
Hypodontia is commonly found dental anomaly but its corelation with skeletal and soft tissue anomaly is rare. The aim of the present paper is to highlight the rare finding of mild case of hypodontia associated with skeletal, dental and soft anomalies.
Teeth that erupt prematurely have been designated with various terms such as natal teeth, neonatal teeth, congenital teeth, pre-deciduous teeth and dentitio praecox. Tooth agenesis is one of very common finding in a person. Developmental or congenital absence of one or more teeth excluding the third molars is a highly prevalent condition referred to as hypodontia. The incidence of hypodontia usually varies from 1.6-6.9% while the incidence of natal teeth on the other hand is noted to be approximately 1:2,000-1:3,000. Lower primary central incisors are the most affected tooth. The occurrence of retained natal teeth and that too with hypodontia is not found in the literature. This case report presents a rare occurrence of hypodontia with presence of retained natal teeth in a 14-year-old male child. Diagnosis made as non-syndromic hypodontia and retained natal teeth.
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