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- Title
A PWM-Mode Pixel-Parallel Image-Processing Circuit Performing Directional State-Propagation and Its Application to Subjective Contour Generation.
- Authors
Kim, Youngjae; Morie, Takashi
- Abstract
As an approach to constructing highly organized and intelligent image recognition systems mimicking the visual architecture in the human brain, we have designed an image processing circuit that performs a directional pixel-state propagation algorithm based on a pixel-parallel architecture using pulse-width modulation (PWM) signals. Directional pixel-state propagation can be used for subjective contour generation, which is a typical function of the visual system in the human brain to fill gaps in natural-image information. A PWM-mode circuit can provide more compact circuit configuration than digital circuits, and can achieve focal-plane analog processing by combining with image sensors without A/D converters. Such circuits are suitable for repetitive algorithms, which require offset-free arithmetic. The proof-of-concept LSI chip has been designed and fabricated using a 0.25 $$\upmu $$ m mixed-signal CMOS process. There are 35 $$\times $$ 35 processing units included in the chip, the operation cycle time for propagation step is 2.2 $$\upmu $$ s, and the power consumption is 363 mW at a supply voltage of 3.3 V. In experiments using this LSI chip, we have successfully generated subjective contours of Kanizsa figures.
- Subjects
IMAGE processing; PULSE width modulation; PIXELS; COMPLEMENTARY metal oxide semiconductors; IMAGE sensors
- Publication
Circuits, Systems & Signal Processing, 2015, Vol 34, Issue 2, p605
- ISSN
0278-081X
- Publication type
Article
- DOI
10.1007/s00034-014-9871-9