8.3Mpixel sensors combine LED flicker mitigation with 140dB HDR

December 09, 2019 //By Julien Happich
sensors
The first two members of OmniVision Technologies’ latest automotive image sensor platform, the 8MP, front-view OX08A and OX08B deliver a 3840x2160 resolution at 36fps for a 16:9 display aspect ratio.

The high-resolution OX08A features the automotive industry's best HDR, while the pinout-compatible OX08B adds a new benchmark in LED flicker mitigation (LFM) performance, enabled by the sensor's on-chip HALE (HDR and LFM engine) combination algorithm. The optimal clarity and range offered by this platform, in combination with integrated ASIL-C features, is vital for front-view automotive applications, such as ADAS and level 3+ autonomous vehicles, where the ability to accurately detect people and objects from far away in all lighting conditions is safety-critical. OmniVision's dual conversion gain (DCG) technology achieves 82dB dynamic range on the first exposure, whereas competitors' image sensors only provide a dynamic range of 60dB or less.

“Unlike DCG, the competing method, known as staggered HDR, relies on additional passes that introduce motion artifacts and diminish range, especially in low light," explains Celine Baron, staff automotive product marketing manager at OmniVision”. "Additionally, OmniVision's 3D stacking technology allowed us to integrate our unique HALE algorithm into the OX08B. The result is that this sensor platform provides an industry-leading 140dB HDR, along with the best LFM performance and high 8MP resolution for superior front-view captures, regardless of external lighting conditions."

This platform also enables sensor fusion, where the same camera signal is used for ADAS and autonomous machine vision while simultaneously feeding into "dash cam" front-view recording and display systems. Additionally, these sensors have region-of-interest functionality for even clearer images of moving objects within fixed areas in the camera's field of view. To ensure the safety of images being used for machine vision applications, ultra low power cybersecurity is also integrated using industry-standard encryption techniques and consuming less than 10% of the sensor's total power budget. The OX08A and OX08B image sensors are both planned to be AEC-Q100 Grade 2 certified.

OmniVision Technologies - www.ovt.com


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