نتایج جستجو برای: image brightness

تعداد نتایج: 389586  

2014
Abdul Rasak Zubair Olasebikan Alade Fakolujo

Edges represent discontinuities of image intensity in an image. High level digital image processing such as object recognition, segmentation and robot vision depend on the accuracy of edge detection. Adding product of the detected image edge and a scaling constant k to the original image is useful for image edge enhancement for better visual perception. Numerical Experiment on high pass spatial...

2009
Sang Hyun Kim

In this paper, a fast motion compensation algorithm is proposed that improves coding efficiency for video sequences with brightness variations. We also propose a cross entropy measure between histograms of two frames to detect brightness variations. The framewise brightness variation parameters, a multiplier and an offset field for image intensity, are estimated and compensated. Simulation resu...

1998
Tsuyoshi Yamane Yoshiaki Shirai Jun Miura

This paper describes a method to track a person by integrating two cues: optical ow and uniform brightness regions, where optical ow cannot be obtained. This method works even if tracking with either optical ow or uniform brightness regions may fail. The proposed method is implemented on a realtime image processor with multiple DSPs and successfully tracked a target person using a real image se...

2009
FANGFANG DONG JIANBIN YANG CHUNXIAO LIU

In this paper, we firstly extend a simple algorithm proposed by Jia et al. [16] to color/vectorial images, and then apply it to some variational models for image restoration including color image denoising with the RGB and chromaticity-brightness(CB) color representation, chromaticity-brightness(CB) based colorization and inpainting etc. The variational models are all total variation(TV)-based ...

2005
Andrea Fusiello

It is worth reminding the reader that geometry is an important but not the only important aspect of computer vision, and in particular of multi-view vision. The information brought by each image pixel is twofold: its position and its colour (or brightness, for a monochrome image). Ultimately, each computer vision system must start with brightness values, and, to smaller or greater depth, link s...

Journal: :archives of cardiovascular imaging 0
ahmad bitarafan-rajabi echocardiography research center, rajaie cardiovascular medical and research center, iran university of medical sciences, tehran, ir iran hadi hasanzadeh department of medical physics, semnan university of medical sciences, semnan, ir iran; department of medical physics, semnan university of medical sciences, semnan, ir iran. tel: +98-2333654171; ext: 525, fax: +98-2333654161 mahdi jahangiri department of medical physics, semnan university of medical sciences, semnan, ir iran zohreh hoseinpour department of medical physics, semnan university of medical sciences, semnan, ir iran hamideh nazemi department of medical physics, semnan university of medical sciences, semnan, ir iran atefeh baghian department of medical physics, semnan university of medical sciences, semnan, ir iran

background evaluation of the accuracy and performance of sonography units needs tissue-mimicking phantoms. these phantoms play an important role by simulating soft tissues, obviating the need to experiment on humans or animals. objectives to present a simple sonographic phantom for quality control and training purposes. materials and methods the presented phantom consists of a two-part plexigla...

Journal: :Optics express 2013
Chien-Yue Chen Ming-Da Ke Qing-Long Deng Jhih-Kai Siao

A micro-prism film, with spectral characteristics, is attached on a display panel to show images appearing with + 10° ~ + 50° and -10° ~-50° bright regions and with a + 10° ~-10° dark region. When both eyes separately receive the bright region and the dark region of an image, interocular delay would appear to generate a stereo perception. With the optical simulation software, LightTools 7.3.0, ...

2005
Fabio Camilli Emmanuel Prados

The Shape–from–Shading models in image analysis lead to first order Hamilton– Jacobi equations which may have several weak solutions (in the viscosity sense). Moreover, for real images, these equations are highly discontinuous in the space variable. The lack of uniqueness and the irregularity of the coefficients involve some troubles when we try to compute a solution. In order to avoid these di...

Journal: :CoRR 2012
Youssef Bassil

Steganography is an information hiding technique in which secret data are secured by covering them into a computer carrier file without damaging the file or changing its size. The difference between steganography and cryptography is that steganography is a stealthy method of communication that only the communicating parties are aware of; while, cryptography is an overt method of communication t...

2013
Yongliang Chen Huabin Wang Liang Tao

Histogram equalization (HE) is one of the common methods for improving contrast in digital images. However, HE may introduce some unnecessary visual deterioration while enhancing image. One of the solutions to overcome this weakness is by preserving the mean brightness of the output image. This paper proposes a new method, known as dynamic contrast enhancement using multiple and clipped histogr...

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