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Active contour models (ACMs) are widely used in image segmentation applications. However, the selection of maximum iterations which controls the convergence of the ACMs is still a challenging problem. In this paper, an adaptive method for choosing the optimal number of iterations based on the local and global intensity fitting energy is proposed, which increases the automaticity of the active contour...
Multi-scale retinex is a luminance perceptual algorithm. It is widely used in image enhancement. To get best effect, the parameters need be adjusted according to the scene manually. In order to handle this issue, a novel retinex algorithm based on real-coded genetic algorithm and human visual system was proposed in this paper. The result was quantified and selected by a novel human visual system based...
This paper presents a simple method to solve the P4P problem based on co-planar feature points. By enhancing the geometric constraints of the feature points which attached to the target previously, we obtain the three-dimensional camera coordinates of the feature points in two different formulas. Then the translation vector and three rotation angles describing the relationship between target coordinate...
Tone-mapping technique which can convert high dynamic range (HDR) to low dynamic range (LDR) images provides accurately visualization of HDR images on standard LDR displays. Most of the existing tone-mapping method could not realize real time processing while preserving good visualization. Utilizing an adaptive three-section lookup table, this paper proposes an effective, high quality, real time technique...
The subpixel imaging technique for image super resolution can get a higher resolution image from two low resolution images which are observed from two linear array CCDs staggered half pixel both along the flight direction and perpendicular direction. In this paper, an adaptive weight interpolation method which considers the Euclidean distance information from two low resolution images for different...
We present a directional shock diffusion approach to single image super-resolution(SR) that is featured by two special treatments to image primitives including edges, corners and junctions. The first is to incorporate an adaptively weighted shock filter to recover the edge sharpness along with the structure-sensitive diffusion terms, and the second is to perform structure oriented diffusion that aims...
The panoramic image has been widely used in social production, and has become an important topic in research on the field of image processing. For complex images with multiple scenes and other elements, the algorithm that is based on Harris cannot make image registration effectively. This paper proposes a method that combines Harris with SIFT, using the Harris algorithm with adaptive threshold to...
Contourlet is a new effective signal representation tool in many image applications. In this paper, a contourlet-based image denoising algorithm using adaptive windows which utilizes both the captured directional information by the contourlet transform and the intrinsic geometric structure information of the image is proposed. The adaptive window in each of the contourlet subband is first fixed by...
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