An inexpensive wireless smart camera system for IoT applications based on an ARM Cortex-M7 microcontroller
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Date
2019
Authors
Tresánchez Ribes, Marcel
Pujol, A.
Pallejà Cabrè, Tomàs
Martínez, D.
Clotet Bellmunt, Eduard
Palacín Roca, Jordi
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Abstract
This paper presents a new proposal of a low-cost and low-power wireless smart camera device, designed to be used as an
inexpensive smart image acquisition edge node for Internet of Things (IoT). Taking the advantages of the ARM CortexM7 microcontrollers, a high-performance STM32F7 microcontroller is used as a main digital signal processor (DSP) to
acquire and transfer images at full rate, keeping the core idle to do real-time image processing. In order to design a very
compact, low-cost and low-power wireless image sensor node, the DSP is supported by an embedded 1.3 Mega Pixel
CMOS camera sensor and a low consumption 2.4GHz Wi-Fi module. This setup allows a custom build-in image
processing algorithm for specific IoT sensing applications or a simply setup as low-cost streaming Motion JPEG (MJPEG)
wireless camera node. In this work, both configurations have been tested and analyzed. Results show that the device can
acquire and process images simultaneously at a full rate (30 fps) and the MJPEG transmission reaches 7.23 fps with a
QVGA resolution.
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Journal of Ubiquitous Systems and Pervasive Networks, 2019, vol. 11, núm. 2 p. 1-8