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the Active Matrix Organic Light Emitting Device (AMOLED) currently apply four sub-pixels architecture, which include a red (R), green (G), blue (B) and additional (X) sub-pixel, which has high luminous efficiency to achieve a power efficient display. Therefore, a specified algorithm would be requested to indicate which pair of sub-pixels is lighting up. In this work, we propose an available method...
The development of computer's application changes our daily life. Online maps application and popularization provide us a more convenience life. As individual users, we usually search for single or several map markers on the Internet. For the existing online map, whether from the positioning accuracy, reaction speed, and operating convenience aspects, it is an advanced system. But for the abundant...
Aviation image stitching requires real-time processing, while traditional key point descriptor generating a floating-point feature vector, thus the processing efficiency in embedded hardware platform such as DSP, FPGA is not satisfactory. Recently ORB feature point is proposed, which has binary vector for feature descriptor, it greatly speeds up processing procedure for feature extraction and matching...
In low luminance images (night scene), it suffers from various problems, e.g., low overall brightness, poor contrast and serious lack of information. However, in some scenario, strong light also appears in these images. In this case, the regions of high and low luminance both exist, which introduces a more complicated situation for image enhancement. In this paper, we present an enhancement method...
Intelligent video surveillance in modern city is becoming more and more popular, and higher quality of images is required in video automatic analysis and recognition. In this paper, we develop a kind of haze-free method for outdoor foggy video image with low contrast. The method is based on the multi-scale guided filtering combined with Retinex algorithm. Compared with the traditional series method...
Illumination compensation is a typical way for increasing the performance of image processing. Retinex algorithm compensates illumination work properly, however, it cannot deal with color constancy of images appropriately. This paper proposes a novel illumination compensation method by converting the image from RGB color space to HSI color space, and with I component enhanced by Retinex algorithm...
In this paper, we implement a new interaction method for the application of augmented reality using ARToolKit and OpenCV SDK. First, on the basis of the exiting marker-based tracking system, this paper achieved the multi-marker tracking that solved the tracking failure problem when the single marker is partially occluded, which greatly improves the robustness of the registration algorithm. In addition,...
Comparative analysis of the biomedical image segmentation methods is presented in this paper. The segmentation methods are offered on the basis of previous labeling and spatial moments. Experimental results show that the developed methods have higher accuracy by signal-noise ratio (up to 40%) compared to the nowadays known.
This paper presents an image mosaic technique using ORB (oriented FAST and rotated BRIEF) descriptor and an improved blending algorithm. Features of images with overlapping regions are first described by ORB descriptors. This binary descriptor outperforms SIFT and SURF in regard of processing speed. RANSAC algorithm is then applied to reject mismatches. Once the best projective deformation matrix...
In the traditional fuzzy connectedness (FC) method, the notion of “hanging togetherness” of image elements specified by their fuzzy connectedness is presented sufficiently. However, the segmentation performance is largely determined by the specified fuzzy affinity; and the FC method generally has disadvantages such as sensitive to the noise, difficult to determine an appropriate threshold in the case...
In the production of stereoscopic video, there are some color differences between different views. In this paper, a color correction method based on decorrelation color space is proposed. Image features from the reference image and original image are first extracted by Harris algorithm, and Normalized Cross-Correlation algorithm (NCC) is used to find the corresponding match points of the images. Then...
In this paper, we look into the colour transformation algorithm, which focuses on the red-green colour vision deficient individuals. Red-green colour deficiency is the most common category of color blindness that causes red and green to be seen as beige color. Two main colour transformation algorithms namely the Daltonize and RGB-HSV algorithm are used to compare to see the different. These algorithms...
The color is a valuable communication resource, not just as part of the message itself, but also as a way of discriminating between the diverse contents of a given message. However, not all people have the ability to distinguish the color in a normal way. About 5% of the world population (8% of men) has a visual impairment, called color vision deficiency (CVD) or, simply, colorblindness. This vision...
Moving shadow detection and removal are key steps for motion detection algorithm. But by far most of the traditional methods, relying solely on single information, can not eliminate shadow effectively. This paper describes a mixed approach to deal with the shadow of the foreground objects from video surveillance. Firstly, a new description of local texture operator—LMTO (Local Match Texture Operator)...
A histogram-based matching algorithm for stereo images captured under different illumination conditions is proposed in this work. The cumulative histogram of an image represents the ranks of relative pixel brightness, which are robust to illumination changes. Therefore, we design the matching cost based on the similarity of the cumulative histograms of stereo images. As an optional mode, the proposed...
In this paper, we propose an effective water droplets segmentation algorithm based on HSV color space and watershed method. Water droplets segmentation is the key issue to design an automatic hydrophobicity classification algorithm, and the challenge is two-fold: highlight spots on water droplets and the transparency of water. By decomposing the color images into HSV color space, water droplets are...
If the histogram equalization on the basis of Retinex theory is used to an image, an excessive enhancement or darkening of brightness may arise. Aimed at these problems, this paper presents a parabolic adjustment of image clearness algorithm, which is mainly based on Retinex theory, equalizing histogram with the aid of parabolic transfer function, while stretching the contrast of image. Experimental...
The paper introduces a novel approach in steganography based on high dynamic range (HDR) images. Our algorithm employs a two-stage image enhancement/preservation, HDR optimization and smart LSB pixel mapping and data rearrangement [1] in order to produce a robust steganographic image, inconspicuous to both human and computerized analysis. In steganography, reliability represents the degree of resistance...
In order to improve the face recognition rate under complex light conditions and address the phenomenon such as white and color distortion, low contrast, which might be produced while using retinex algorithm to process face images, this paper proposes a new and multi-scale retinex with color restoration algorithm for light compensation of color images. On the basis of studying of MSRCR theory, we...
The performance of full-color LED display is related with refresh rate, This paper presents a advanced scan mode based on dispersed PWM, and illustrates the algorithm to disassemble a PWM pulse into many regular narrow pulses. This scan mode can provide very high dynamic refresh rate rather than fixed frequency, eliminate flicker effect even as low frame frequency and expand gray-scale depth .This...
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