In this paper, we propose a new three-dimensional stereo image reconstruction algorithm for a photoacoustic medical imaging system. We also introduce and discuss a new theoretical algorithm by using the physical concept of Radon transform. The main key concept of proposed theoretical algorithm is to evaluate the existence possibility of the acoustic source within a searching region by using the geometric distance between each sensor element of acoustic detector and the corresponding searching region denoted by grid. We derive the mathematical equation for the magnitude of the existence possibility which can be used for implementing a new proposed algorithm. We handle and derive mathematical equations of proposed algorithm for the one-dimensional sensing array case as well as two dimensional sensing array case too. A mathematical k-wave simulation data are used for comparing the image quality of the proposed algorithm with that of general conventional algorithm in which the FFT should be necessarily used. From the k-wave Matlab simulation results, we can prove the effectiveness of the proposed reconstruction algorithm.
In this paper, we propose a new image reconstruction algorithm considering the geometric information of acoustic sources and senor detector and review the two-step reconstruction algorithm which was previously proposed based on the geometrical information of ROI(region of interest) considering the finite size of acoustic sensor element. In a new image reconstruction algorithm, not only mathematical analysis is very simple but also its software implementation is very easy because we don't need to use the FFT. We verify the effectiveness of the proposed reconstruction algorithm by showing the simulation results by using Matlab k-wave toolkit.
In this paper, we introduce the mobile embedded system implemented for capturing stereo image based on two CMOS camera module. We use WinCE as an operating system and capture the stereo image by using device driver for CMOS camera interface and Direct Draw API functions. We aslo comments on the GPU hardware and CUDA programming for implementation of 3D exaggeraion algorithm for ROI by adjusting and synthesizing the disparity value of ROI (region of interest) in real time. We comment on the pattern of aperture for deblurring of CMOS camera module based on the Kirchhoff diffraction formula and clarify the reason why we can get more sharp and clear image by blocking some portion of aperture or geometric sampling. Synthesized stereo image is real time monitored on the shutter glass type three-dimensional LCD monitor and disparity values of each segment are analyzed to prove the validness of emphasizing effect of ROI.
In this paper, we introduce the mobile embedded system implemented for capturing stereo image based on two CMOS camera module. We use WinCE as an operating system and capture the stereo image by using device driver for CMOS camera interface and Direct Draw API functions. We send the raw captured image data to the host computer by using WiFi wireless communication and then use GPU hardware and CUDA programming for implementation of real time three-dimensional stereo image by synthesizing the depth of ROI(region of interest). We also try to find and declare the mechanism of deblurring of CMOS camera module based on the Kirchhoff diffraction formula and propose a deblurring model. Synthesized stereo image is real time monitored on the shutter glass type three-dimensional LCD monitor and disparity values of each segment are analyzed to prove the validness of emphasizing effect of ROI.
Photoacoustic tomography (PAT) is a promising medical imaging modality by reason of its particularity. It combines
optical imaging contrast with the spatial resolution of ultrasound imaging, and it can distinguish changes in biological
features in an image. For these reasons, many studies are in progress to apply the technique for diagnosis. However, realtime
PAT systems are necessary to confirm biological reactions induced by external stimulation immediately. Thus, we
have developed a real-time PAT system using a linear array transducer and a custom-developed data acquisition board
(DAQ). To evaluate the feasibility and performance of our proposed system, a phantom test was also performed. As a
result of those experiments, the proposed system shows satisfactory performance, and its usefulness has been confirmed.
We monitored the degradation of a rat’s kidney inducing inflammation, using our developed real-time PAT.
In this paper, we present an algorithm for obtaining an original image which becomes blurred due to the size of
the aperture of the CMOS camera module in capturing images of the objects near the camera. We introduce the
mathematical property of a circulant matrix which can be used to describe the PSF and propose a new algorithm
based on this matrix. We suggest new algorithms for both one-dimensional and two-dimensional signal processing
case. These proposed algorithms were validated by the results of computer simulation for two-dimensional images
synthesized by a CMOS camera model which was based on a pinhole camera model previously proposed by our
research group.
This paper presents a new model of a complementary metal-oxide-semiconductor (CMOS) camera using combinations of several pin hole camera models, and its validity is verified by using synthesized stereo images based on OpenGL software. Our embedded three-dimensional (3-D) image capturing hardware system consists of five motor controllers and two CMOS camera modules based on an S3C6410 processor. An optimal alignment for capturing nine segment images that have their own convergence planes is implemented using a pi controller based on the measures of alignment and sharpness. A new synthesizing fusion with the optimized nine segmentation images is proposed for the best 3-D depth perception. Based on the experimental results of the disparity values in each of the nine segments, the multi-segment method proposed in this paper is a good method to improve the perception of 3-D depth in stereo images.
In this paper, we introduce the harwdare/software technology used for implementing 3D stereo image capturing
system which was built by using two OV3640 CMOS camera modules and camera interface hardware implemented
in S3C6410 MCP. We also propose multi-segmented method to capture an image for better 3D depth feeling.
An image is composed of 9 segmented sub images each of which is captured by using two degree of freedom
in DC servo per each left and right CMOS cameras module for the improving the focusing problem in each
segmented sub image. First, we analyze the whole image. We hope and sure that this new method will improve
the comfortable 3D depth feeling even though its synthesizing method is a little complicated.
This paper discussed the whole body cooperated work to generate large impact energy which is generated by arm when hit a wall. The maximum power of arm of the humanoid robot is lower than that of leg. But humanoid robot can generate more impact power by whole body cooperated motion than only used a arm. The humanoid robot falls easily down by force of the repulsion of the impact energy. But the robot can generate much of the impact energy by the stabilization of the ZMP. This paper discussed not only a relationship between the stabilization of the ZMP and the impact energy, but also a relationship between the whole bodies cooperated force control and impact energy.
In recent decade, there has been many researches for embedding a small size operating system for mobile hand held systems. In near future, small size operating system will be embedded in every electronic machine for the easiness of developing a man-machine interface. This paper introduced one of the new hot issuing small size operating systems, called as "wince OS", which was developed by Microsoft company and develop a simple device driver based on wince OS which can handles a simple matrix type push button input device. It also demonstrated the well functioning of the proposed device driver in working environment such as Microsoft word processing.
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