Enhancing Image Quality and WiFi Transmission in Automotive Dashcams
through Power Stability Optimization with Capacitors and Beads
Abstract
This paper presents the design and optimization of a power and
communication architecture for a car dashcam system with integrated WiFi
data transmission. The system architecture utilizes a 5V DC power supply
regulated through DC-DC buck converters and Low Dropout Regulators
(LDOs) to provide stable power to the image sensor and other subsystems.
To improve image quality, especially in low-light conditions, power
stability was enhanced using additional capacitors and beads to mitigate
noise and ripple effects. The primary communication link
between the dashcam’s sensor and the WiFi module is established via a
UART interface, enabling efficient real-time data transmission to mobile
devices. The image sensor’s digital data is processed by an ISP (Image
Signal Processor) and transmitted through the MIPI interface to the SoC,
while the WiFi module provides seamless data connectivity for remote
access and live monitoring. This paper discusses the power design
challenges, particularly in the analog and digital domains, and
evaluates the impact of power noise on image quality and transmission
reliability over WiFi. Test results demonstrate that improving
power integrity significantly reduces noise artifacts, such as
horizontal bands in low-light video, and enhances the overall
performance of the WiFi transmission. This solution is particularly
relevant for automotive and IoT applications where stable image capture
and efficient wireless communication are critical.
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