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One image processing application is to reconstruct the original scene from the low quality images. Considering the idea histogram distribution can reflect good vision effect. So many histogram analyzing based methods have been studied recently. However, some methods require users to set some parameters or condition, and cannot get the optimal results automatically. To overcome those short come, this...
This paper proposes a method for enhancing the color images based on nonlinear transfer function and pixel neighborhood by preserving details. In the proposed method, an input RGB color image is converted into an HSV color image. The image enhancement is applied only on the V (luminance value) component of the color image, because change in the H and S component could change the color balance between...
In this paper a novel Gabor filter hardware scheme for the fingerprint image enhancement is presented. For each pixel of the image, we use accurate local frequency and orientation to generate the corresponding convolution kernel and thus achieve a better enhancement effect. And compared to the previous works, our design yields a higher throughput which is due to the pipeline techniques. Moreover the...
Edge preserving smoothing prior to image segmentation is very important, since the image detailed information is mostly in edges, and smoothing uncorrupted pixels can sharply reduce the image quality. Hence, a novel noise detection method is essential to identify the noised pixels and noise-free pixels. In this paper, the noise detection is based on the difference between the pixel of interest value...
Ant Colony Optimization (ACO) is a group of algorithms inspired by the foraging behavior of ant colonies in nature. Like their biological counterparts, a colony of artificial ants is able to adapt to the changes in their environment, such as exhaustion of a food source and discovery of a new one. In this paper, one of the basic ACO algorithms, the Ant System algorithm, was applied for edge detection...
Following the rapid advances in digital technologies, more and more consumer electronic devices, such as cell phones and PDAs, are equipped with built-in camera modules. In order to be cost-effective, optoelectronics components used in such devices are usually not sophisticated enough to support professional photographing. Pictures taken by such devices tend to be of unsatisfiable quality under poor...
Recently, considerable research has been done to reduce the gap between direct observation of a scene and its recorded image. Typically the differences exist because of the high dynamic range compression capability of the human visual systems, and its capacity for color constancy. In this paper we define a new method that provides dynamic range compression, color consistency and color rendition for...
The retinex algorithm is commonly used to image enhancement. Recently, the image size what we usually use, is bigger and bigger. The digital camera use big size images and the television is change to HD television. So the image enhancement time is longer and longer and it needs more powerful system such as multi-core, many-core systems. But these multi-core, many-core systems or powerful systems are...
The objective of this work is to evaluate the performance of a set of despeckle filters for Optical Coherence Tomography (OCT) of the skin. The six filters are based on local statistics, median filtering, pixel homogeneity, geometric filtering and transformed domain homomorphic filtering. The results of this study suggest that geometric filtering algorithm outperforms other candidate methods, and...
This paper presents a segmentation of brain lesion from diffusion-weighted magnetic resonance images (DW-MRI or DWI) using a split and merge approach. The lesions are hyperintense lesion from tumour, acute infarction, haemorrhage and abscess, and hypointense lesion from chronic infarction and haemorrhage. Pre-processing is applied to the DWI for intensity normalization, background removal and intensity...
Baggage scanning systems are widely used at security checkpoint in airports for homeland security applications. However, the CT baggage images suffer from background noise and the presence of low contrast. To address this problem, this paper introduces a new 3D CT baggage image enhancement algorithm using order statistic decomposition. Computer simulation and comparisons are given to demonstrate the...
Median filter is a non-linear filter used in image processing for impulse noise removal during morphological operations, image enhancement and other image processing operations. It finds its typical application in the situations where edges are to be preserved for higher level operations like segmentation, object recognition etc. Real-time applications, such as video and high speed acquisition cameras...
Fluorescent cell micrographs contain inhomogeneous contrast levels due to fluorescence intensity variations and the existence of out-of-focus objects. A novel image enhancement method based on adaptive local region sizes is proposed, which can correctly highlight salient objects from changing background intensity. The local region size for each pixel is determined adaptively, then locally normalized...
In this study, we investigate several methods for enhancing scanned mokkan images to aid archeologists and historians in the interpretation of mokkans. Mokkans are wooden tablets with handwritten characters used in 8th century Japan. Due to damages and natural deterioration, the interpretation of the text on mokkans is difficult even for archeologists and historians. The automatic interpretation of...
There is an improvement to the Bicubic interpolation enlargement algorithm based on the hardware parallel processing in this article. Search table method used in this paper has avoided massive cubic and the floating numbers multiply operation. It reduces the computation load greatly. Convolution operation in tow directions, level and vertical, of the 4x4 picture element matrix on FPGA has been realized...
The revolution in communication technology facilitates fast and reliable information transfers and is being increasingly used in various fields like scientific, military, civilian and economic. Apart from the speed and reliability, security in transferring the information is gaining much importance now days. Optical data transfer offers several dimensions in which information can be hidden such as...
Palmprint identification is a subcategory of biometrics identification, which can be efficiently used to identify the people. Palmprint-based identification is currently a potential alternative to human identification method of a well known fingerprint-based identification. For example, if the hand of the identified person is dirty, the accuracy of fingerprint-based identification is distorted, while...
Current video and image systems are typically of limited use in poor visibility conditions such as in poor illumination, rain, fog, smoke, and haze. These conditions severely limit the range and effectiveness of imaging systems because of the severe reduction in contrast. The contrast of any image is a very important characteristic which decides the quality of image. Our chief goal in this paper is...
Thanks to the exceptionally good properties, chaotic systems have been widely studied and developed in image scrambling and watermarking algorithms in recent years. In this paper, the chaotic standard Baker map is improved and employed to scramble the pixel positions of host image and watermark image in the preprocessing of watermarking. Experimental results show that the scrambling algorithm based...
In this paper we present a novel method for high quality real-time video enhancement; it improves the sharpness and the contrast of video streams, and simultaneously suppresses noise. The method is comprised of three main modules: (1) noise analysis, (2) spatial processing, based on a new multi-scale pseudo-bilateral filter, and (3) temporal processing that includes robust motion detection and recursive...
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