Optimization of retina-like sensor parameters based on visual task requirements

Wang, Fan; Cao, Fengmei; Bai, Tingzhu; Su, Yulun

doi:10.1117/1.oe.52.4.043206

Cited by 10 publications

(4 citation statements)

References 22 publications

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“…The first ring has 1 pixel, the second ring has 5 pixels, the third ring has 10 pixels, and the 138th ring has 640 pixels. And the total number of pixels is 52066 [3] .…”

Section: Design and Implementation Of Sdram Controllermentioning

confidence: 99%

SDRAM timing design based on retina-like distributed CMOS sensor

Chen

Cao

2022

Optoelectronic Devices and Integration XI

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In the research process of wireless transmission of retina-like distributed CMOS sensor, a design scheme of SDRAM controller based on FPGA is proposed to solve the problem of large amount of buffered data in real-time image acquisition system. A single-chip SDRAM is used as the data cache device, and the ping-pong read and write operation control scheme is implemented by switching Banks. Its purpose is to improve data transmission stability. And FIFO is used to solve the problem of clock domain crossing. The result of design is simulated by vivado. The waveform finally obtained shows that the design scheme can implement clock domain crossing and SDRAM operations of writing and reading. It can be used as an IP core in the SOC system.

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“…The first ring has 1 pixel, the second ring has 5 pixels, the third ring has 10 pixels, and the 138th ring has 640 pixels. And the total number of pixels is 52066 [3] .…”

Section: Design and Implementation Of Sdram Controllermentioning

confidence: 99%

SDRAM timing design based on retina-like distributed CMOS sensor

Chen

Cao

2022

Optoelectronic Devices and Integration XI

Self Cite

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“…Inspired by the space-variant sampling structure of human eye, retina-like imaging provides a novel approach to solve the issues above [8][9][10]. The retina-like method reconstructs an image with high-resolution at the center and low resolution in its periphery.…”

Section: Introductionmentioning

confidence: 99%

Study on Rotation and Scaling Invariance of Retina-Like Imaging

et al. 2020

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Inspired by human vision, retina-like imaging has the feature of rotation and scaling invariance, which is beneficial for target tracking and recognition. However, there is a limitation that the center of field of view (FOV) should match with the target centroid. Currently, there is no effective method to quantitatively estimate the effects from this mismatch. To solve the issue, a novel evaluation method is proposed by applying the log-polar transform and Fourier transform. Then reconstruct the target image by exchanging magnitude and phase information between the target image and its rotated or scaled counterpart. Using two current methods of digital image processing, scale-invariant feature transform (SIFT) and biaxial projection similarity analysis (BPS), as evaluation criteria, the proposed method performs efficiently for all eccentric angles. Simulation results show that for a specific target, the invariance of rotation and scaling works effectively for a value above 0.69.

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“…It is particularly helpful for pattern recognition, motion estimation and object tracking. To the best of our knowledge, there have been a few previous studies on the large FOV feature of the compound eye 36 – 38 and the space-variant resolution property of the human eye 39 – 41 , respectively. However, the hybrid of the compound and human eyes has not yet been studied.…”

Section: Introductionmentioning

confidence: 99%

Design and modeling of pulsed-laser three-dimensional imaging system inspired by compound and human hybrid eye

Cheng

Cao

Zhang

et al. 2018

Sci Rep

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A pulsed-laser three-dimensional imaging system inspired by compound and human hybrid eye is proposed. A diffractive optical element is used to enlarge field of view (FOV) of transmitting system and a receiving system consisting of a non-uniform microlens array, an aperture array, and an avalanche photodiode array is designed. The non-uniform microlens array is arranged on a curved surface to mimic large FOV feature of the compound eye. Meanwhile, the non-uniform microlens array is modeled to mimic space-variant resolution property of the human eye. On the basis of the proposed system, some simulation experiments are carried out. Results show that the entire FOV is up to 52°, and the resolution is 30 × 18. The proposed system has a high resolution in the center FOV and a low resolution in the peripheral FOV. The rotation and scaling invariances of the human eye are verified on the proposed system. The signal-to-noise ratio (SNR) increases with the increase in the number of rings and the maximum SNR locates at the outmost periphery area. This work is beneficial to the design of the pulsed laser three-dimensional imaging system with large FOV, high speed, and high resolution.

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Optimization of retina-like sensor parameters based on visual task requirements

Cited by 10 publications

References 22 publications

SDRAM timing design based on retina-like distributed CMOS sensor

SDRAM timing design based on retina-like distributed CMOS sensor

Study on Rotation and Scaling Invariance of Retina-Like Imaging

Design and modeling of pulsed-laser three-dimensional imaging system inspired by compound and human hybrid eye

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