Character Recognition of Low Resolution CCTV Images of Sewer Inspection

Sewer inspection and comparison of acoustic and CCTV methods

j1 Anna Romanova BEng PhD Student, School of Engineering Design and Technology, University of Bradford, Bradford, UK j2 Kirill V. Horoshenkov BEng, PhD Professor of Acoustics, School of Engineering Design and Technology, University of Bradford, Bradford, UK j3 Simon J. Tait BEng, PhD Professor of Civil Engineering, School of Engineering Design and Technology, University of Bradford, Bradford, U...

CCTV inspection of sewer segments: calibration of performance indicators based on experts’ opinions

Asset management is an increasing concern for wastewater utilities and companies. Indicators are developed for supporting the definition of investigation and rehabilitation programs. These indicators are mostly based on visual inspections, which provide major information. However, difficulty remains in the translation of a visual inspection survey into dysfunction indicators. Condition grade of...

Inverse of Low Resolution Line Halftone Images for Document Inspection

Recognition of Character Strings in Low-quality Images Using Character and Inter-character Space Patterns

A method for character-string recognition is presented. The proposed method jointly evaluates features obtained from individual characters and inter-character spaces. Combining these features resolves ambiguity in segmentation and classification of low-quality character-string images. To evaluate the inter-character features, an intercharacter orthogonal subspace is constructed for each permuta...

Segmenting ideal morphologies of sewer pipe defects on CCTV images for automated diagnosis

Several literatures presented automated systems for detecting or classifying sewer pipe defects based on morphological features of pipe defects. In those automated systems, however, the morphologies of the darker center or some uncertain objects on CCTV images are also segmented and become noises while morphology-based pipe defect segmentation is implemented. In this paper, the morphology-based...