Quantitative Analysis of Automatic Image Cropping Algorithms: A Dataset and Comparative Study
Published: 05 January 2017
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Automatic photo cropping is an important tool for improving visual quality of digital photos without resorting to tedious manual selection. Traditionally, photo cropping is accomplished by determining the best proposal window through visual quality assessment or saliency detection. In essence, the performance of an image cropper highly depends on the ability to correctly rank a number of visually similar proposal windows. Despite the ranking nature of automatic photo cropping, little attention has been paid to learning-to-rank algorithms in tackling such a problem. In this work, we conduct an extensive study on traditional approaches as well as ranking-based croppers trained on various image features. In addition, a new dataset consisting of high quality cropping and pairwise ranking annotations is presented to evaluate the performance of various baselines. The experimental results on the new dataset provide useful insights into the design of better photo cropping algorithms.
Construction of a Hydrogen Peroxide Biosensor on Interdigitated Microband Electrodes Fabricated by a Mix-and-Match Proce...
Published: 28 March 2015
Journal of The Electrochemical Society,
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A hydrogen peroxide biosensor was fabricated by immobilization of horseradish peroxidase (HRP) onto the surface of interdigitated microband electrodes. The interdigitated microband electrodes show an amplification factor of ∼9.1 with a collection efficiency of 0.97, demonstrating a high efficiency in generator-collector experiments. Electrochemical impedance spectroscopy was used to follow the biosensor assembly process on the surface of interdigitated microband electrodes step-by-step. When HRP is coated onto the interdigitated microband electrodes, the charge resistance increases significantly, proving the immobilization of HRP on electrode surface. The surface morphology of the HRP modified interdigitated microband electrode was characterized by atomic force microscopy (AFM). AFM images show that the HRP is covering the interdigitated microband electrodes surface evenly. The resulting hydrogen peroxide biosensor exhibits a sensitivity of 114.75 A M−1 cm−2, a detection limit of 9.96 μM, and a linear range up to 500 μM. The performance of the proposed biosensor is evaluated in the presence of potential interferences such as ascorbic acid and uric acid.