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Phase Congruency (PC) can highlight small discontinuities in images with varying illumination and contrast using the congruency of phase in Fourier components. PC can not only detect the subtle variations in the image intensity but can also highlight the anomalous values to develop a deeper understanding of the images content and context. In this paper, we propose a new method based on PC for computational...
Photo album summarization refers to the process of choosing a representative subset of photos in a photo album. In this paper, we propose a novel system capable of automatic photo album summarization based on three fundamental criteria, namely, aesthetic quality, interestingness, and memorableness. Based on these criteria, steps for filtering and scoring photos are designed. Through an experiment...
Superpixel algorithm aims to semantically group neighboring pixels into a coherent region. It could significantly boost the performance of the subsequent vision processing task such as image segmentation. Recently, the work simple linear iterative clustering (SLIC) [1] has drawn huge attention for its state-of-the-art segmentation performance and high computational efficiency. However, the performance...
Relative localization is a core problem for swarm robotics since each swarm node must determine where neighboring robots are located to accomplish cooperative tasks such as formation control. In this paper we present a system that performs relative localization between a stationary marker and a flying robot in real-time. Relative distances are obtained using ultra-wide band radio, while a low-cost...
This paper introduces a novel example-based inpainting algorithm. It is different from traditional methods in two ways. First, it emphasizes the continuity of edges in filling processing because human vision system is sensitive to broken edges. Edge continuity is promised by a new measurement of similarity between texture patches, which gives different weights to different points based on their gradient...
High Dynamic Range (HDR) image and video technology aims at conveying the full range of perceptible shadow and highlight details with sufficient precision. HDR is regarded by many experts as the next evolution in digital media. However, industrial broadcasters have concerns regarding the bandwidth overhead that this new technology entails. While many consider that broadcasting HDR content would increase...
A distance measurement method for a single-camera condition is proposed. The aim is to implement a way to find the distance of an object in front of the imaging system in indoor environment. In this method, the first step is to extract the appropriate vertical floor line from the snapshots sequence. Moreover, the line passing through the base side of the object is found simultaneously with the floor...
Vision systems are becoming popular as a method of gathering information and stimuli from a robot's environment. The goal of this paper is to implement an underwater distance ranging system using a stereo vision system. Target tracking is based on the color of the targets. The ranging algorithm was designed so that it can range targets up to 2 meters away with a minimum accuracy of 90%. An algorithm...
Simple and low-cost method for the measurement of inter-vehicle distance has been developed. Proposed method is based on geometric similarity between an object on the rear surface of a vehicle and its image on image sensor. Size of the object should be well-known or be informed using visible light communication. This time, a license plate was used as the object during the day, and a distance between...
Aiming at the problems of the global image matching, an area based on image matching algorithm is presented. In the paper, the principle of area based image matching is given firstly and the algorithm is analyzed in detail. In the algorithm, in order to diminish the influence of the segmentation to image matching, color key feature points are chosen as the feature of image and weighted distance measurement...
We present a nonparametric and efficient method for shape localization that improves on the traditional sub-window search in capturing the fine geometry of an object from a small number of feature points. Our method implies that the discrete set of features capture more appearance and shape information than is commonly exploited. We use the a-complex by Edelsbrunner et al. to build a filtration of...
A 1.5Mpixel RGBZ image sensor that simultaneously captures color (RGB) and time-of-flight (ToF) range (Z) images is presented. While ToF sensors are well documented [1,2], few, if any, monolithic sensors have been reported that capture both range and color. In one sensor [3], a combined pixel structure captures color and range, but presumably in sequential fields. This approach does not allow simultaneous...
This paper presents a compact and robust solution to use stereo vision to detect pedestrians as well as measure their instantaneous distances from the vehicle. This simplifies sensor requirements as the same video information (captured from two cameras) is used for detection of pedestrians as well as measurement of their corresponding distances. To apply stereo vision technique a novel approach has...
In this paper, we design the obstacle recognition system using ultrasonic sensor, DRFC (Duplex Radio-Frequency Camera) and GPS technique for the visually impaired person. We configure low cost system because now cost of assistance tools for visually impaired people is highly expensive. So we improve portability of system, though making simple hardware. We apply function determining image information...
In this paper, we consider the digital watermarking based on the modulation of image pixels in YCbCr color space, and propose a method to improve its performance. Basically, we divide the watermark into two parts, and embed each part into each chrominance channel. Based on this concept, in the watermark extraction process, we can reduce the number of the watermarked pixels used in the original pixel...
We describe a system which follows “trails” for autonomous outdoor robot navigation. Through a combination of visual cues provided by stereo omnidirectional color cameras and ladar-based structural information, the algorithm is able to detect and track rough paths despite widely varying tread material, border vegetation, and illumination conditions. The approaching trail region is simply modeled as...
Aiming at the inflexible re-weighting problem of relevance feedback (RF) in image retrieval, a re-weighting relevance feedback method utilizing particle swarm optimization (PSORW-RF) is proposed. Firstly, initialize feature weightings randomly, then use the variances of the positive and negative feedback samples' features as study principle, utilize particle swarm optimization (PSO) algorithm to optimize...
To calculate and render the stereo disparity map in real time at a video rate is a challenging problem. In the approach to use the raster scan video system, typically correlations are measured from a point in the left image to a point in the right image along the ID raster, then stereo correspondence for each and every pixel is searched. The time warp algorithm based on the dynamic programming (DP)...
Interactivity is one of the key challenges for immersive applications like gaming. Manufacturers have been working towards interfaces that are driven by a device (e.g. a Wiimote) or interfaces that are controlled by a camera with a subsequent computer vision module. Both approaches have unique advantages, but they do not permit to localize users in the scene with an appropriate accuracy. Therefore,...
We propose a region-based method to extract semantic foreground regions from color video sequences with static backgrounds. First, we introduce a new distance measure for background subtraction which is robust against shadows. Then the foreground region is extracted with a graph-based region segmentation method considering background difference and spatial homogeneity. For efficient computation, the...
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