Design Article
How to implement automotive smart rear-view cameras
By Tom Wilson, CogniVue Corp.
1/21/2013 1:55 PM EST
Lessons learned, applied
The software code was structured such that some customization to the solution is possible to accommodate specific camera module hardware and custom user interfaces. As a minimum, the following application components can be modified by the customer, or a 3rd party developer: graphic overlays, addition of a custom logo, look-up-tables (LUTs) for custom views, and sensor driver/settings. The image below shows one UI implementation with parking guides and a marker to highlight the location of the nearest object.
Lessons Learned and Applied
Performing object detection and distance estimation using a single-sensor based 1” cube camera presented significant challenges, but in the end a successful implementation was achieved. Lessons learned were many, with the most noteworthy shared below in an effort to help ease the development path for future embedded vision successes.
About the author:
Tom Wilson is vice president of business development at CogniVue Corp., which makes image cognition processors and software for embedded vision systems. CogniVue is a founding member of the Embedded Vision Alliance.
The software code was structured such that some customization to the solution is possible to accommodate specific camera module hardware and custom user interfaces. As a minimum, the following application components can be modified by the customer, or a 3rd party developer: graphic overlays, addition of a custom logo, look-up-tables (LUTs) for custom views, and sensor driver/settings. The image below shows one UI implementation with parking guides and a marker to highlight the location of the nearest object.
Figure 4: Alternate UI for Smart Back-Up
Camera Application
Lessons Learned and Applied
Performing object detection and distance estimation using a single-sensor based 1” cube camera presented significant challenges, but in the end a successful implementation was achieved. Lessons learned were many, with the most noteworthy shared below in an effort to help ease the development path for future embedded vision successes.
- Acquire a comprehensive ‘golden’ image validation database and automate the test process. This will enable testing the algorithm during all phases of development and determine if algorithm changes have impacted performance.
- Be mindful of the embedded platform architecture, its properties and limitations and develop a set of guidelines both platform and algorithm developers must adhere to in an effort to reduce PC algorithm re-writes.
- Develop a vision-centric software framework. Algorithm development does not consider data movement and a “software framework” can help manage the complexities of vision processing data movement. The framework can ensure data is always available for processing, reducing pipeline stalls and cache misses.
- Develop specialized vision libraries to simplify and speed porting onto the target embedded platform. Library functions of high level complex processing “primitives” which are optimized for the specific scalar and vector processor architecture can be reused in follow-on embedded vision application development.
- Develop a tool for camera calibration and look-up-table (LUT) coefficients instead of generating these manually. The task of generating LUTs for different sensor/lens combinations is tedious and time consuming. We developed a PC-based tool to automatically generate LUTs for creating custom views specific to the camera lens selected.
- Structure the code to accommodate customizing specific components of the final solution. For example, consider offering the application code in the form of a toolkit whereby elements can be modified and a new build can be generated by simply linking in the lower level algorithm binary executable.
- Take all necessary design precautions to ensure a clean signal from the image sensor is acquired by the image processing device. A noisy signal from the sensor will mean sub-optimal performance.
About the author:
Tom Wilson is vice president of business development at CogniVue Corp., which makes image cognition processors and software for embedded vision systems. CogniVue is a founding member of the Embedded Vision Alliance.
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William Miller
3/22/2013 8:34 AM EDT
I support every single decision to make our lives safer. If a back-up camera can save someone's life, why didn't put it in your vehicle? Trucks and SUV should be the first in the queue I guess.
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William - http://www.carid.com/back-up-cameras-sensors.html
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