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Coded structured light is an effective technique to acquiring shape in stereovision. Coding strategy is one of the core techniques because it effects the measure precision and efficiency directly. There are two major group of techniques in color structured light encoding. One is to define coloured multi-slit, which is suitable for locating intensity peaks in the image. The other is to define coloured...
Camera calibration is one of the key procedures for computer vision and the accuracy of camera calibration is of vital importance in terms of ensuring the systematic measurement accuracy. An automatic calibration method based on traditional camera calibration is proposed in this paper. First of all, calibrated image series can be gained by using improved calibrating template with regional calibration...
The selection of color space is one of the determinants of the image segmentation quality, the segmentation results will be more accurate if the appropriate color space is adopted. In this paper, five kinds of color space RGB, HSI, YIQ, YCbCr, Lab are compared by three types of evaluation methods. The third method of image segmentation quality evaluation is proposed in this paper. The results shows...
Color characteristics in cell images are quantized by analysis of cell color first. Then the color in cells is recognized by using multi-threshold segmentation technique, meanwhile the number of different kind of cells is calculated easily. The experimental results show that the average time of recognition is 18 seconds, the accuracy rate of recognition is 96.3%, and the accuracy rate of calculation...
This paper proposes a method to detect the macula in the retinal fundus image automatically. The method makes use of the optic disc height obtained from the ARGALI to define the region of interest. Regions of dark spots are then detected by finding the coordinates with the lowest pixel intensity and determining the average pixel neighbourhood intensities. These regions are ranked to determine the...
This paper proposes a method used to improve the retrieval performance of the digital watermarking based on the modification of image pixels. By embedding the watermark in the chrominance channel and using the mean filter with 3??3 window size in the watermark extraction process, the accuracy of the extracted watermark can be improved. Sets of experiment are carried out to verify our concept. The...
In this paper, we propose a technique for classifying shots of playfield-based sports video into their respective view classes. Based on common broadcasting style, a shot can be classified as a far-view or a closeup-view. The technique considers the frame-wise color values of each pixel in the HSV color space, while at the same time calculating the assumed object size within the segmented playfield...
This work is a part of the project to develop a multicamera 3-D gait analysis system based on passive markers. The system consists of two modules, i.e. the camera synchronization and calibration module and the marker detection and tracking module. The work presented in this paper concerns with the automatic detection of 2-D marker coordinates from the video recording produced by one camera. 2-D coordinates...
An efficient colorization scheme for images and videos based on prioritized source propagation is proposed in this work. A user first scribbles colors on a set of source pixels in an image or the first frame of a movie. The proposed algorithm then propagates those colors to the other non-source pixels and the subsequent frames. Specifically, the proposed algorithm identifies the non-source pixel with...
This paper presents a technique for detecting caption text for indexing purposes. This technique is to be included in a generic indexing system dealing with other semantic concepts. The various object detection algorithms are required to share a common image description which, in our case, is a hierarchical region-based image model. Caption text objects are detected combining texture and geometric...
A new high dynamic range rendering (HDRR) suitable for YUV images is presented. The method overcomes the problem on saturation decrease caused by the conventional HDRRs for YUV images. U and V components are corrected with an approximating function that is designed to preserve the metric chroma in CIELAB before and after an HDRR. The function is derived from the relationship between the changes in...
We propose an illumination invariant and rotation insensitive texture representation based on a Markovian textural model. A texture is aligned with its dominant orientation and textural features are derived from fast analytical estimates of Markovian statistics. We do not require any knowledge of illumination direction or spectrum. This makes our method suitable for computer analysis of real scenes,...
Interactive image segmentation is a powerful paradigm that allows users to direct the segmentation algorithm towards a desired output. However, marking scribbles on multiple images is a cumbersome process. Recent works show that statistics collected from user input in a single image can be shared among a group of related images to perform interactive cosegmentation. Most works use a naive heuristic...
In-body imaging technologies such as vital-stained magnification endoscopy pose novel image processing challenges to computer-assisted decision systems given their unique visual characteristics such as reduced color spaces and natural textures. In this paper we will show the potential of using adapted color features combined with local binary patterns, a texture descriptor that has exhibited good...
In this paper, we present a study of the realism of color image composites. Assessing the realism of image composites has emerged as a new field of image processing due to the advances in digital imaging and communications. However, when making image composites, users often suffer from color incompatibility between the inserted object and the background. We observe two properties that help make an...
This paper presents a novel study of the classification of large-scale Mars McMurdo panorama image. Three dimensionality reduction techniques, based on fuzzy-rough sets, information gain ranking, and principal component analysis respectively, are each applied to this complicated image data set to support learning effective classifiers. The work allows the induction of low-dimensional feature subsets...
The process of creating photorealistic 3-dimensional computer graphic (3DCG) images is divided into two stages, i.e., modeling and rendering. Automatic rendering has gained popularity, and photorealistic rendering is generally used to render different types of images. However, professional artists still model characters manually. Moreover, not much progress has been achieved with regard to 3-D shape...
In this article, we present a ball detection algorithm based on color information and Hough transform. Our objective is to detect the color balls under complex environments and different illumination conditions. To do so, we firstly apply the multiscale Retinex algorithm to enhance the image. Then, an adaptive Hough transform is introduced to locate the position of the balls in order to reduce the...
The use of High Dynamic Range (HDR) content is becoming increasingly popular in content creation and post-production. Advances in digital technology allow creating HDR content much easier than before. HDR display devices, on the other hand, are still not mature enough to become widely available. Therefore, HDR content has to go through a particular processing step, usually called tone mapping or tone...
In this paper, we describe the design of a mosaicing technique for images from a microscope system with automatically controlled object stage and image capture unit. Due to the limited field of view in microscope imagery, larger objects are split up into many adjacent, but slightly overlapping frames. In many fields, such as medicine or biology, it is vastly beneficial that these image patches are...
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