Seiji Kameda

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A silicon retina that emulates the sustained and the transient responses in the vertebrate retina was fabricated. The circuit of the chip consists of two layers of resistive network that have different length constants. The output emulating the sustained response possesses a Laplacian-Gaussian-like receptive field and, therefore, carries out a smoothing and(More)
A window-based stereo matching, which matches pixel values within a window between two images, produces a dense disparity map, and as a result, constructs a dense depth structure. Many algorithms of the window-based stereo matching have been proposed. The conventional algorithms, however, face a trade-off between accuracies of the disparity map in disparity(More)
The neuromorphic silicon retina is a novel analog very large scale integrated circuit that emulates the structure and the function of the retinal neuronal circuit. We fabricated a neuromorphic silicon retina, in which sample/hold circuits were embedded to generate fluctuation-suppressed outputs in the previous study . The applications of this silicon(More)
A 100 x 100 pixel analog silicon retina was fabricated. The two functions of the silicon retina were verified: a Laplacian-Gaussian-like spatial filtering and a subtraction of consecutive frames. The analog silicon retina fabricated in the present study has matured from a development prototype to full-scale practical usefulness. Furthermore, we have(More)
A linear analog network model is proposed to characterize the function of the outer retinal circuit in terms of the standard regularization theory. Inspired by the function and the architecture of the model, a vision chip has been designed using analog CMOS Very Large Scale Integrated circuit technology. In the chip, sample/hold amplifier circuits are(More)
A silicon retina is an intelligent vision sensor that can execute real-time image preprocessing by using a parallel analog circuit that mimics the structure of the neuronal circuits in the vertebrate retina. For enhancing the sensor's robustness to changes in illumination in a practical environment, we have designed and fabricated a silicon retina on the(More)
In this study, we developed a vision system that separates an image into a set of spatial frequency bands using multiple spatial filters during each single frame sampling period of 20 ms. The vision system comprises active pixel sensors (APS), two sample and hold (S/H) circuits, an analog resistive network, and a field-programmable gate array (FPGA). The(More)