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Many computer vision tasks, such as video surveillance, motion analysis and object recognition, need accurate object segmentation results. Nevertheless, good segmentation is difficult to be obtained by most state-of-the-art algorithms in non-uniform degraded images. In this paper, we present an efficient object segmentation method to deal with such problem. First, superpixel-based pairwise fuzzy connectedness...
Automatically segmenting the salient object based on the saliency information frequently fails on the non-uniform motion blurred images. We propose a novel saliency-based object segmentation method with a self-expansion mechanism to deal with this problem in this paper. Firstly, to improve the initial localization accuracy for expansion, we integrate a modified local autocorrelation congruency into...
Most LED luminaires encounter the problem of color non-uniformity in illumination fields. In order to address the issue, we propose a ripple TIR lens, which can apply to both phosphor-converted LEDs and multicolor LED arrays and achieves good color performance. The ripple TIR lens consists of a collimator and a ripple panel. Simulation results based on a precise phosphor-converted white LED model...
An improved screen printing technology for the coating of a cerium-doped yttrium aluminum garnet (YAG): Ce3+ yellow phosphor on blue light emitting diodes (LEDs) is presented. A metal plate with apertures matches with wire-bonded LED chips on a substrate. Silicone with YAG: Ce3+ phosphor is pushed into the apertures by a squeegee blade and then the metal plate is removed by release agent after curing...
In this paper, we explore the segmentation performance of four state-of-the-art unsupervised over-segmentation methods by evaluating the quality of over-segments. To achieve this goal, we design a novel real-time evaluating framework, this method is integrating the classical goodness methods and our proposed new discrepancy method based on real-time boundary extraction, which is able to suppress the...
It is an important tool for content-based image retrieval (CBIR) to do retrieval by using color feature. When someone retrieval an image, he or she can use a variant of color spaces, which have different advantages. In this paper, we analyze the characteristics of color space used by MPEG-7 color layout descriptor. HSV is used instead of the original color space according to the nature of the human...
This paper presents a novel object-oriented stereo matching on multi-scale superpixels to generate a low-resolution depth map. It overcomes the classic downsampling methods' disadvantages, such as boundary blurring, outlier enlargement and foreground objects merging to background, etc. The approach we exploited is to segment the image in three scales' superpixels from dense to sparse ones according...
Reconstructing 3D shapes from 2D images based on structured light is becoming an increasingly important topic in computer vision. However, low resolution and sensitive to environment illumination are the main restriction of this technology for practical application. This paper proposes a new color coded structured light technique for reconstructing object shape from a single image. This technique...
The color uniformity is a critical index in the evaluation of high quality white light emitting diodes (LEDs). The main factor affecting the color distribution is the state of the phosphor. The secondary factor is the optical structure. This paper analyzes two parameters of the phosphor layer (thickness and concentration) and six optical structures. Results indicate that the structures with reflector...
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