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This paper presents a new method for accurate skin detection. Skin detection techniques are used in various image and video processing applications, such as image categorization, face detection and tracking and, more recently, in selective image enhancement for digital TV products. The proposed method achieves high accuracy using a combination of color information and pseudo-morphological processing,...
This paper presents a new algorithm for nighttime contrast enhancement. The proposed algorithm modifies the traditional histogram equalization algorithm to maintain the color information of the original nighttime images. The algorithm has a low computational cost that makes it suitable for real-time hardware implementation. In addition, its efficient hardware implementation is detailed on a Xilinx...
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...
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...
Real-time video enhancement is generally achieved using costly specialized hardware that have specific functions and outputs. Commercial off-the-shelf hardware, such as desktop computers with Graphics Processing Units (GPUs), are also commonly used as cost effective solutions for real-time video processing. In the past, the limitations in computer hardware meant that real-time video enhancement was...
In this work, we develop an architecture to implement a deblocking filter to improve the quality of video decoded from MPEG. The filter is controlled by the quantization scale parameter, which is derived from the decoded stream based on a novel algorithm. The hardware implementation is targeting an FPGA device similar to those currently used in post-processing units of high end flat panel TV sets...
High dynamic range (HDR) images keep dynamic range of luminance from 105 to 108 and preserve more details than low dynamic range (LDR) images. Conventional acquisition of HDR images requires several images with different exposure settings of one scene, so multiple cameras or static scene are necessary. Besides, in order to transform HDR images onto normal LDR display, tone-mapping algorithms are required...
In order to enhance the resolution of Charge Coupled Device (CCD) pixel with the pixel dimension and focal length of optical system unchanged, the problem of CCD geometric superresolution is educed. The problem is discussed in terms of software and hardware. In software, the bicubic interpolation is introduced, while in hardware, the subpixel imaging method is utilized. The subpixel imaging method...
Making the transition between digital video imagery acquired by a focal plane array and imagery useful to a human operator is not a simple process. The focal plane array ?sees? the world in a fundamentally different way than the human eye. Gamma correction has been historically used to help bridge the gap. The gamma correction process is a non-linear mapping of intensity from input to output where...
A novel adaptive image enhancement technique based on image characteristic is proposed in this paper. At first, the spatial high-pass filter (the Laplace filter) is applied to the original image data. Then, the first-order classifying of the image is employed on the basis of the specification of the output of the Laplace filter. The low-pass filter is applied to smooth the image for the high threshold...
Motion estimation (ME) is the most computationally intensive and the most power consuming part of video compression and video enhancement systems. In this paper, we propose a novel power reduction technique for ME hardware. We quantified the impact of glitch reduction, clock gating and the proposed technique on the power consumption of two full search ME hardware implementations on a Xilinx Virtex...
A simple image enhancement technique based upon evolvable hardware is presented. Improving visual appearance is achieved by evolved histogram stretching transformation (evolved circuit). The performance is compared with the classical histogram equalization method using traditional measures of enhancement. Experimental results will be presented to show that the proposed technique offers better performance...
Motion estimation (ME) is the most computationally intensive part of video compression and video enhancement systems. One bit transform (1BT) based ME algorithms have low computational complexity. Therefore, in this paper, we propose high performance systolic hardware architectures for 1BT based fixed block size (FBS) and variable block size (VBS) ME. The proposed ME hardware architectures perform...
The two-dimensional spatial median filter is a core algorithm for impulse noise removal in digital image processing and computer vision. While the literature presents several analyses of median filters optimized for a standard 3 times 3 pixel neighborhood configuration, a 5 times 5 neighborhood, useful for imagery exhibiting noise not conforming to the classic ldquosalt and pepperrdquo formation,...
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