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Advanced safety vehicle (ASV) is a critical issue in recent years for automobiles, especially when the number of vehicles is growing rapidly world wide. The cost down of general cameras makes it feasible to having an intelligent system of visual-based event detection in front for forward collision avoidance and mitigation. When driving in nighttime, vehicles in front are generally visible by their...
Current prominent camera identification methods use wavelet-based filter to extract photo-response non-uniformity (PRNU) noise as camera fingerprint. However, these noise features in heavily textured images can not be extracted by using wavelet-based filter effectively. In this paper, we propose a new camera identification method that uses curvelet-based filter to extract noise features in heavily...
This paper investigates solutions to improvement of realistic rendering quality of CG (Computer Graphics) character face. In order to manipulate face skin feature distribution, based on bio-anatomic structure, skin surface is classified into 3 layers (Internal, Regular and Local layer) to control skin base color, surface cellular venation level and noise distribution like freckle, respectively. Moreover,...
This paper presents a robust new method to fast and precisely position the fingertip of all open fingers on a skin color detection image. Based on a set of distance-based feature pixels, which are extracted on both the connected component labeling image and distance transform image, a new principle to select the hand region and a new principle to determine the center of the hand in an image have been...
In this paper, we propose a new method to detect the forgeries in digital images by using photo-response non-uniformity (PRNU) noise features. The method utilizes canonical correlation analysis (CCA) to measure linear correlation relationship between two sets of PRNU noise estimation from images taken by the same camera. The linear correlation relationship maximizes the correlation between the noise...
Back-to-front, show-through, or bleeding are the names given to the interference that appears whenever one writes or prints on both sides of translucent paper. Such interference degrades image binarization and document transcription via OCR. The technical literature presents several algorithms to remove the back-to-front noise, but no algorithm is good enough in all cases. This article presents a...
In this paper, we proposed a simple yet effective image binarization method to work with various kinds of images, such as images with the color bleeding characters, or with non-uniform background exposed to poor ambient light, and so forth. Our approach is based on a hybrid color quantization process, which adaptively takes the global and local image characteristics into account; therefore, it can...
We present an alternative approach to address correspondence in computational stereo. Accurate correspondence between two 2D images is required to determine depth, which leads to 3D model generation. To achieve this, optimized noise reduction method and accurate edge detection are required for preprocessing, followed by extracting the contours from the edge detection output and detecting the correspondence...
Noise is common phenomenon in every data. Non-text components in binarized text images, which are the results of the text extraction, are considered as noise. It degrades the performance of character recognition module. In this paper, a robust algorithm is proposed to detect text in the binarized text image with noise by extracting a new feature, called stroke width. Firstly, stroke width feature...
The use of one-shot pattern projection to obtain 3D dense reconstruction constitutes a promising field of research in structured light. Most of the related works presented in the literature are based on the projection of a fringe pattern to extract depth from phase deviation. However, the algorithms employed to unwrap the phase are computationally slow and can fail under certain slopes and occlusions...
The cavity is an important indicator of quality detection for the man-made fiberboard. According to the smaller sizes, the variant shapes and the larger range of colour distribution of the cavities, this paper carries out a detailed analysis of the cavity parameters. This paper enhances the contrast of the image of the cavity, and then uses the threshold segmentation method to extract the cavity image,...
Automatically assigning relevant text keywords to images is an important problem. Many algorithms have been proposed in the past decade and achieved good performance. Efforts have focused upon model representations of keywords, but properties of features have not been well investigated. In most cases, a group of features is preselected, yet important feature properties are not well used to select...
The last few years have seen the use of photo response non-uniformity noise (PRNU) - a unique fingerprint of imaging sensors, in various digital forensic applications such as source device identification, content integrity verification and authentication. However, the use of a colour filter array for capturing only one of the three colour components per pixel introduces colour interpolation error,...
A visual pallet recognition system based on the accurate color segmentation is proposed. The basic idea is to get the pallet color feature samples from the images in working environment before the autonomous mobile forklift works. Then the algorithms of morphological filtering, Sobel edge detection and Hough transform are used to get the pallet forking side. At last, according to two corners of the...
Noise is common in binarized images which are the result of extracting text from the embedded text in an image. It degrades the performance of character recognition module. In this paper, a robust algorithm is proposed to eliminate noise from the binarized text image based on the text-stroke width information. First, salt-pepper-like noises are eliminated by a morphological filter, which is to enhance...
Wipe transition is an important type of gradual transition, but false and missed detection are very serious in most literatures due to noise and motion. In the proposed scheme, color sub-image and edge sub-image of each frame are decomposed by Db-4 wavelet transition. In detecting potential wipe transition, the color sub-image is divided into 8*8 pixel blocks, and Gaussian mode is applied to adjust...
In this paper, a novel method for accurate and real-time lip contour extraction in gray-level images is presented. The main idea is to grow the contour from some key points based on constraints of parabola fitting and gradient maximum which are combined using D-S theory. This approach can accurately extract continuous lip contour by simultaneously taking color and shape information into consideration,...
Part I of this two-part paper proposed a robust way to detect local points on linear-isophote surface in an image. Only a subset of these points corresponds to linear surface in image irradiance and provides useful information about the camera response function (CRF). In Part II, we show that, for some images, this subset of linear points could constitute a very small portion of the candidate set...
The video sequences degraded by fog suffer from poor visibility. In this paper, we present a contrast limited adaptive histogram equalization (CLAHE)-based method to remove fog. CLAHE establishes a maximum value to clip the histogram and redistributes the clipped pixels equally to each gray level. It can limit the noise while enhancing the contrast. First, the background image is extracted from the...
In this paper, we introduce tamper detection techniques based on artifacts created by color filter array (CFA) processing in most digital cameras. The techniques are based on computing a single feature and a simple threshold based classifier. The efficacy of the approach was tested over thousands of authentic, tampered, and computer generated images. Experimental results demonstrate reasonably low...
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