Approximately 1.3 billion people live with some sort of vision impairment out of which 188.5 million people have a mild vision impairment, 217 million have moderate to severe vision impairment, 36 million people are blind and the majority of people with vision impairment are over the age of 50 years.
According to WHO, around 5% of the world’s population or 466 million people suffer from disabling hearing loss. Technology is advancing day by day and during the last few decades, it has made our lives easier and convenient.
(Raspberry Pi)Design:
The raspberry Pi is the support system of the device which connects the camera, microphone, speaker and LCD display. The device works for the visually impaired as the camera clicks a picture of the document and the output is in audio format through the speaker, audibly impaired as the microphone takes the spoken words as input and displays it as text on the LCD display, and for the vocally impaired as the user types the message in the LCD and the speakers gives the output as an audio.
Raspberry Pi, is a low cost, credit card sized processor, which can easily perform all task we expect from a desktop. It is very easy to connect raspberry pi with computers and TVs. It also provides GPIO (General Purpose Input Output) pins to connect with other components. Because of this efficiency to intercommunicate with the cross-disciplinary domain, it has been used in a variety of projects. Raspberry pi operates in an open source environment such as Raspbian (Linux based operating system)
Technical specification:
Broadcom Soc BCM2836 (CPU, GPU, DSP, SDRAM)
900 MHz quad-core ARM Cortex A7 CPU (ARMv7 instruction set)
Broadcom VideoCore IV @ 250 MHz GPU
1 GB MEMORY (shared with GPU)
4 USB ports
17 GPIO(General Purpose Input Output) Peripherals plus specific functions, and HAT ID bus
15-pin MIPI camera interface (CSI) Video input connector
HDMI video outputs, composite video (PAL and NTSC) via 3.5 mm jack
I²S audio input
Analog audio output via 3.5 mm jack; digital via HDMI and I²S
MicroSD for storage
10/100Mbps Ethernet speed
800 mA power rating (4.0 W)
5 V power source via MicroUSB or GPIO(General Purpose Input Output) header
85.60mm × 56.5mm
Weighs 45g (1.6 oz)
Camera Module:
The camera used by project is a C310HD Logitech webcam, shown in Figure 6 with a resolution of 720p/30fps. The images taken are crisp and contrasted. This camera fits perfectly in the project as it adjusts to the lighting conditions to produce brighter contrasted images. It uses a universal clip to attach itself firmly to the device. It is small, adjustable and agile and is therefore handy in the project.
Technical specifications
Max Resolution: 720p/30fps
Lens technology: standard
Focus type: fixed focus
Field of View: 60°
Built-in mic: mono
Cable length:1.5 m
Universal clip fits laptops, LCD or monitors
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