Rear view camera | Autonomous Ride

Camera-based features ( Rear vision camera) and parking features

The primary purpose of a rear vision camera is to enhance safety and prevent accidents while reversing or maneuvering in tight spaces. It helps eliminate blind spots and provides better visibility of the area behind the vehicle that may not be visible through the rearview mirrors alone.

Camera Placement: The camera is typically positioned on the rear bumper or tailgate of the vehicle. It is strategically angled to capture a wide-angle or wide field of view, encompassing the area immediately behind the vehicle.

Display Unit: The camera's video feed is transmitted to a display unit located within the vehicle's cabin. Common display locations include the dashboard, infotainment screen, or rearview mirror. The display provides real-time visuals from the camera, allowing the driver to monitor the surroundings while reversing.

Guidelines and Distance Indicators: Many rear vision camera systems include additional features such as guidelines or distance indicators on the display. Guidelines can help the driver estimate the vehicle's path or trajectory while reversing, aiding in maneuvering. Distance indicators provide a visual representation of the proximity between the vehicle and nearby objects, assisting the driver in judging distances accurately.

Integration with Other Sensors: Rear vision cameras are often integrated with other sensors and systems within the vehicle, such as parking sensors or proximity sensors. These sensors can provide audible or visual warnings if the vehicle is approaching an obstacle, complementing the camera's visual information.

Legal Requirements: In some regions, the installation of rear vision cameras has become mandatory in new vehicles or specific vehicle classes to improve safety standards. For example, in the United States, regulations require all new passenger vehicles under 10,000 pounds to be equipped with a rearview camera.

Overall, rear-vision cameras enhance driver awareness and safety while reversing or maneuvering the vehicle. They provide a clear view of the rear area, help eliminate blind spots, and assist in avoiding collisions with objects, pedestrians, or other vehicles

A rear vision camera, commonly known as a backup camera or reversing camera, is a type of camera installed on the rear of a vehicle.

It provides the driver with a clear view of the area directly behind the vehicle, aiding in reversing, parking, and avoiding collisions with obstacles.

How to use it

When you shift your car into REVERSE, the backup camera automatically turns on. A video display shows an image of the area behind your car. This display screen is usually in the rearview mirror or on the dashboard

HOW DOES IT WORK?

Your backup camera is located in the rear of your car. It is connected to a display screen that shows you what is happening in the area behind the vehicle.

Back-up Warning System

Some backup camera systems include sensors in the rear bumper. These sensors detect objects behind your car. When an object is detected, your system will provide a warning light and/or a warning sound.

Rear Cross Traffic Alert

Some cars are also equipped with Rear Cross Traffic Alert. This system helps you back out of a parking space when your vision may be blocked. Sensors monitor both sides of the vehicle. If an oncoming vehicle is detected, it will alert you.

Here are some key points about rear vision cameras:

Tutorials: Make your Rear view camera with Raspberry pi4

HDMI-based Camera for Raspberry Pi

An HDMI cable can be used to connect a camera to a Raspberry Pi. Here's a general overview of how you can set it up:

Choose a compatible camera: Raspberry Pi supports a variety of camera modules that can be directly connected to its dedicated CSI (Camera Serial Interface) connector. The most common camera module is the Raspberry Pi Camera Module, available in both regular and high-definition versions.
Connect the camera module: To connect the camera module to the Raspberry Pi, make sure the Pi is turned off. Locate the CSI connector on the Raspberry Pi board (usually a ribbon cable connector labeled "CAMERA"). Carefully insert the ribbon cable into the connector, ensuring it is correctly aligned. Gently secure the cable by closing the connector latch.

Enable the camera interface: Boot up the Raspberry Pi and ensure the camera interface is enabled. You can do this by following these steps:
- Launch the Raspberry Pi configuration tool by opening a terminal window and entering: sudo raspi-config
- In the configuration tool, navigate to "Interfacing Options" or "Interface Options."
- Select "Camera" and enable it if it's not already enabled.
- Reboot the Raspberry Pi to apply the changes.
Test the camera: After enabling the camera interface and rebooting, you can test the camera by capturing an image or recording a video. You can use the raspistill command-line tool for capturing images or the raspivid tool for recording videos. Here are a couple of examples:
- To capture an image: raspistill -o image.jpg
- To record a 10-second video: raspivid -o video.h264 -t 10000
Display the camera output via HDMI: If you want to view the camera output on a display connected via HDMI, you can use the Raspberry Pi's HDMI port. Connect one end of the HDMI cable to the HDMI port on the Raspberry Pi and the other end to an HDMI input on your display. Ensure your display is set to the correct HDMI input source.

Once everything is connected and configured, you should be able to see the camera output on your HDMI display. You can further explore various software libraries and applications to control and manipulate the camera feed on your Raspberry Pi.

Tutorial

import pygame
import os

# Initialize Pygame
pygame.init()

# Set screen resolution
screen = pygame.display.set_mode((800, 480))

# Load your background image
background = pygame.image.load("path_to_your_background_image.jpg").convert()

# Load image to overlay
overlay_image = pygame.image.load("path_to_overlay_image.png").convert_alpha()

# Resize overlay image to fit the screen
overlay_image = pygame.transform.scale(overlay_image, (800, 480))

# Main loop
running = True
while running:
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False

# Display background
screen.blit(background, (0, 0))

# Overlay the image onto the screen
screen.blit(overlay_image, (0, 0))

# Update the display
pygame.display.update()

pygame.quit()

This code initializes a Pygame window, loads a background image, resizes and overlays another image on top of it, and continuously updates the display. You'll need to replace "path_to_your_background_image.jpg" and "path_to_overlay_image.png" with the actual paths to your images.

Running on Raspberry Pi Touchscreen:

Ensure your Raspberry Pi is configured to run Python scripts.
Copy and paste this code into a Python file (e.g., image_overlay.py) on your Raspberry Pi.
Run the Python script from the terminal (python image_overlay.py) to see the display on your touchscreen.

Note:

This is a basic example; you can further enhance it by adding touch event handling, incorporating buttons or interactive elements, or modifying the displayed images based on user input.
You might need to adjust the screen resolution and image sizes based on your touchscreen's dimensions to ensure proper display and scaling.
Depending on the complexity of your project, you might explore other libraries like tkinter for GUI creation on Raspberry Pi.

output

Running on Raspberry Pi Touchscreen:

Note:

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