A VLSI Implementation of Barrel Distortion Correction for Wide-Angle Camera Images

Chen, Pei-Yin; Huang, Chien-Chuan; Shiau, Yeu-Horng; Chen, Yao-Tung

doi:10.1109/tcsii.2008.2010165

Cited by 21 publications

(21 citation statements)

References 11 publications

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“…In [2], a pipelined architecture was presented to realize a high-speed correction system. In [3], the mapping polynomial was manipulated so as to eliminate the coordinate transformation required in the correction process. In [4], a multi-cycle architecture was presented to reduce the hardware complexity by compromising the correction speed to some extent.…”

Section: Barrel Distortion Correctionmentioning

confidence: 99%

Fast Barrel Distortion Correction for Wide-Angle Cameras

Kim

2015

IEICE Trans. Inf. & Syst.

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SUMMARYBarrel distortion is a critical problem that can hinder the successful application of wide-angle cameras. This letter presents an implementation method for fast correction of the barrel distortion. In the proposed method, the required scaling factor is obtained by interpolating a mapping polynomial with a non-uniform spline instead of calculating it directly, which reduces the number of computations required for the distortion correction. This reduction in the number of computations leads to faster correction while maintaining quality: when compared to the conventional method, the reduction ratio of the correction time is about 89%, and the correction quality is 35.3 dB in terms of the average peak signal-tonoise ratio. key words: barrel distortion correction, optical distortion, wide-angle cameras, image enhancement

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Section: Barrel Distortion Correctionmentioning

confidence: 99%

Fast Barrel Distortion Correction for Wide-Angle Cameras

Kim

2015

IEICE Trans. Inf. & Syst.

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“…According to previous techniques [13]- [15], the back-mapping expansion polynomial can be approximated to odd-order polynomial as…”

Section: Simplified Back-mapping Proceduresmentioning

confidence: 99%

“…There are two steps to reduce the computing resources of back-mapping procedure. The first is eliminating the calculation of θ [13]. According to (5b), the θ and θ are the same.…”

Section: Simplified Back-mapping Proceduresmentioning

confidence: 99%

“…A pipelined coordinate rotation digital computer (CORDIC) is used in this paper for improving the efficiency of coordinate transformation. In addition, a low-cost high-speed 21-stage pipelined VLSI architecture for barrel distortion correction is presented in [13]. Angle calculation elimination and odd-order back-mapping polynomial are used to improve performance and reduce hardware cost.…”

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confidence: 99%

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Time Multiplexed VLSI Architecture for Real-Time Barrel Distortion Correction in Video-Endoscopic Images

Chen¹,

Huang²,

Luo³

2011

IEEE Trans. Circuits Syst. Video Technol.

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A low-cost very large scale integration (VLSI) implementation of real-time correction of barrel distortion for videoendoscopic images is presented in this paper. The correcting mathematical model is based on least-squares estimation. To decrease the computing complexity, we use an odd-order polynomial to approximate the back-mapping expansion polynomial. By algebraic transformation, the approximated polynomial becomes a monomial form which can be solved by Hornor's algorithm. With the iterative characteristic of Hornor's algorithm, the hardware cost and memory requirement can be conserved by time multiplexed design. In addition, a simplified architecture of the linear interpolation is used to reduce more computing resource and silicon area. The VLSI architecture of this paper contains 13.9-K gates by using a 0.18 μm CMOS process. Compared with some existing distortion correction techniques, this paper reduces at least 69% hardware cost and 75% memory requirement.

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“…따 라서 소프트웨어 형태로 구현하기 보다는 전용화 된 하 드웨어로 구현하여 고속의 동작을 가능케 하는 것이 일 반적이다 [3][4][5][6][7][8][9] . 또한, 소형화된 시스템에 적용하기 위해서 는 낮은 복잡도를 갖는 저 면적의 구현이 필요하다.…”

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Design and Implementation of a Low-Complexity Real-Time Barrel Distortion Corrector for Wide-Angle Cameras

Jeong¹,

Kim²,

Lee³

et al. 2013

Journal of the Institute of Electronics and Information Enginee

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The barrel distortion makes serious problems in a wide-angle camera employing a lens of a short focal length. This paper presents a low-complexity hardware architecture for a real-time barrel distortion corrector and its implementation. In the proposed barrel distortion corrector, the conventional algorithm is modified so that the correction is performed incrementally, which results in the reduction of the number of required hardware modules for the distortion correction. The proposed barrel distortion corrector has a pipelined architecture so as to achieve a high-throughput correction. The correction rate is 74.86 frames per sec at the operating frequency of 314MHz in a 0.11㎛ CMOS process, where the frame size is 2048×2048. The proposed barrel distortion corrector is implemented with 14.3K logic gates.

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A VLSI Implementation of Barrel Distortion Correction for Wide-Angle Camera Images

Cited by 21 publications

References 11 publications

Fast Barrel Distortion Correction for Wide-Angle Cameras

Fast Barrel Distortion Correction for Wide-Angle Cameras

Time Multiplexed VLSI Architecture for Real-Time Barrel Distortion Correction in Video-Endoscopic Images

Design and Implementation of a Low-Complexity Real-Time Barrel Distortion Corrector for Wide-Angle Cameras

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