To meet the real time requirements an interpolation free, parallel algorithm for the fast Radon transform (FRT) and inverse FRT (IFRT) is proposed. The proposed method solves all the important problems associated with...
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To meet the real time requirements an interpolation free, parallel algorithm for the fast Radon transform (FRT) and inverse FRT (IFRT) is proposed. The proposed method solves all the important problems associated with the previous interpolation free FRT and IFRT algorithm and reduces the number of computations and algorithmic complexities significantly. The proposed algorithm is highly regular and we also describe a methodology to design a dedicated parallel processing architecture from the view point of its efficient implementation.
In this paper, a novel reconfigurable discrete cosine transform processor is proposed to perform the Shape-Adaptive DCT (SA-DCT) algorithm, which is a dominating computational kernel of various object-based video sign...
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ISBN:
(纸本)078038251X
In this paper, a novel reconfigurable discrete cosine transform processor is proposed to perform the Shape-Adaptive DCT (SA-DCT) algorithm, which is a dominating computational kernel of various object-based video signalprocessing. The SA-DCT algorithm is analyzed in detail to capture important architecture design issues and then design efficient hardware architecture. A dynamically reconfigurable datapath is proposed to meet the run-time reconfigurable computational requirement of SA-DCT. Besides, a prototyping chip has been implemented to prove the feasibility of proposed architecture. This reconfigurable DCT processor supports complete functions of SA-DCT and therefore suitable for high-end and high-quality object-based video applications.
We present a quantitative evaluation of a Maximum a Posteriori image reconstruction (USC-MAP) implemented on the Concorde microPET-R4 camera. This iterative reconstruction algorithm uses a Bayesian reconstruction tech...
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Hypercomplex Fourier transforms based on quaternions have been used for gray and color imageprocessing. In this paper, we present the relations between the quaternion Fourier spectral coefficients. Using these relati...
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ISBN:
(纸本)078038251X
Hypercomplex Fourier transforms based on quaternions have been used for gray and color imageprocessing. In this paper, we present the relations between the quaternion Fourier spectral coefficients. Using these relations, we can separate the scalar and vector part of quaternion image for frequency domain and find the constraints of the Fourier spectral coefficients which the quaternion Fourier transform of these spectral coefficients will have zero scalar part. In addition, we can calculate the DQFT of four real images, or the DQFT of two compleximages by only one DQFT and we can design a color cosine image from frequency domain. Finally, we discuss the property of the DQFT of a causal image.
We report on imaging of coral skeletal densities using pulse-echo ultrasound. Focused ultrasound transducers with frequencies ranging from 1 to 5 MHz were used to image coral skeletal samples. Each transducer was scan...
We report on imaging of coral skeletal densities using pulse-echo ultrasound. Focused ultrasound transducers with frequencies ranging from 1 to 5 MHz were used to image coral skeletal samples. Each transducer was scanned over the surface of a coral and the reflected signal from the coral was recorded. Post-processing of the ultrasound signal was used to generate images of the acoustic impedance of the coral—a quantity that is related to the density of the coral. The ultrasound images were qualitatively consistent with x-ray images of the coral samples—x-ray absorption is also related to coral density. Both images showed a banding structure related to the annual growth cycle of the coral. The results indicate that ultrasound can be used for nondestructive imaging of coral skeletal structure. The ultimate goal would be an in situ system for quantitatively measuring skeletal densities of live corals underwater. The skeletal density of several massive reef coral species is strongly correlated with ocean temperature. A time series reconstructions of the skeletal density of long lived specimens would provide a history of surface ocean temperatures over time periods extending over several centuries, far beyond the available instrumental record.
applications that require digital signalprocessing (DSP) functions are typically mapped onto general purpose DSP processors. With the introduction of advanced FPGA architectures with built-in DSP support, a new hardw...
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applications that require digital signalprocessing (DSP) functions are typically mapped onto general purpose DSP processors. With the introduction of advanced FPGA architectures with built-in DSP support, a new hardware alternative is available for DSP designers. By exploiting its inherent parallelism, it is expected that FPGAs can outperform DSP processors. However, the migration of assembly code to hardware is typically a very arduous process. This paper describes the process and considerations for automatically translating software assembly and binary codes targeted for general DSP processors into register transfer level (RTL) VHDL or Verilog code to be mapped onto commercial FPGAs. The Texas instruments C6000 DSP processor architecture has been used as the DSP processor platform, and the xilinx Virtex II as the target FPGA. Various optimizations are discussed, including loop unrolling, induction variable analysis, memory and register optimizations, scheduling and resource binding. Experimental results on resource usage and performance are shown for ten software binary benchmarks in the signalprocessing and imageprocessing domains. Results show performance gains of 3-20x in terms of reductions in execution cycles and 1.3-5x in terms of reductions in execution times for the FPGA designs over that of the DSP processors in terms of reductions in execution cycles.
Multimedia technologies are becoming more sophisticated, enabling the Internet to accommodate a rapidly growing audience with a full range of services and efficient delivery methods. Although the Internet now puts com...
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ISBN:
(数字)9780080488660
ISBN:
(纸本)0120471442;1417544309
Multimedia technologies are becoming more sophisticated, enabling the Internet to accommodate a rapidly growing audience with a full range of services and efficient delivery methods. Although the Internet now puts communication, education, commerce and socialization at our finger tips, its rapid growth has raised some weighty security concerns with respect to multimedia content. The owners of this content face enormous challenges in safeguarding their intellectual property, while still exploiting the Internet as an important resource for commerce. Data Hiding Fundamentals and applications focuses on the theory and state-of-the-art applications of content security and data hiding in digital multimedia. One of the pillars of content security solutions is the imperceptible insertion of information into multimedia data for security purposes; the idea is that this inserted information will allow detection of unauthorized *** a theoretical framework for data hiding, in a signalprocessing contextRealistic applications in secure, multimedia deliveryCompression robust data hidingData hiding for proof of ownership--WATERMARKINGData hiding algorithms for image and video watermarking
This paper presents a framework for incorporating knowledge sources directly in the space-time beamformer of airborne adaptive radars. The algorithm derivation follows the usual linearly constrained minimum-variance (...
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This paper presents a framework for incorporating knowledge sources directly in the space-time beamformer of airborne adaptive radars. The algorithm derivation follows the usual linearly constrained minimum-variance (LCMV) space-time beamformer with additional constraints based on a model of the clutter covariance matrix that is computed using available knowledge about the operating environment. This technique has the desirable property of reducing sample support requirements by "blending" the information contained in the observed radar data and the a priori knowledge sources. applications of the technique to both full degree-of-freedom (DoF) and reduced DoF beamformer algorithms are considered. The performance of the knowledge-aided beamforming techniques are demonstrated using high-fidelity x-band radar simulation data.
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