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                自動駕駛成像:減少LED閃爍并實現高動態范圍 - 在路上

                由  ON Semiconductor 發布  - 2019-07-17 

                安森美半導體專家了解成像應用能力對自動駕駛的重要性,且必須在100%的時間運行。為驗證我們的方案,我們把我們的圖像傳感器通過惡劣的現實世界測試,確保您可信賴我們的產品。

                看看我們的傳感器如何用于攝像機充當車輛的眼睛,引導車輛做出關鍵的決策。這些攝像機必須能夠在各種照明場景下工作,如晴天或暴風雪。觀看自動車輛如何得益于安森美半導體抑制LED閃爍和高動態范圍技術而能在惡劣的天氣條件下工作,同時保持安全。

                以下是視頻的完整文本

                您好,我是Bahman Hadji,來自安森美半導體智能感知部汽車方案分部。

                汽車環境對圖像傳感器提出了許多不同的挑戰。

                這些傳感器用于安全至關重要的先進駕駛輔助系統(ADAS)的攝像機中,充當車輛的眼睛,提供諸如自適應巡航控制和360度環視系統等功能。

                這些“眼睛”必須能工作在極微光條件以及陽光明媚的情況下。

                圖像傳感器必須能捕獲到這些高動態范圍成像情況下的所有場景細節,因為要依靠“在方向盤后面”的大腦來做出決策-無論該大腦屬于駕駛員還是由ADAS算法構建的人工智能。

                像我們停到這里的交通燈正通過脈寬調制工作。

                為省電和控制強度,LED燈正以我們眼睛察覺不到的速度閃爍脈沖,每秒可達90次以上。

                脈沖式LED不只用于交通燈,它已普遍用于現代汽車前燈和尾燈設計以及電子交通標志或可變消息傳輸系統中,旨在向駕駛員傳達交通條件和速度限制等信息。

                為捕獲高動態范圍的場景,特別是像這樣的場景中明亮的區域,傳統的圖像傳感器會使用較短的曝光來避免過飽和-比這些LED的導通時間要短得多。

                但這會導致在視頻中出現燈光閃爍,因為它的幀在捕獲LED時,有時是導通的,有時是關斷的。

                這種不想要的效果可能會分散駕駛員的注意力,也會引起ADAS算法混亂。

                曝光足夠長的時間以保證在每個幀內捕獲導通的LED將導致一個過飽和的圖像,這也是不可取的。

                安森美半導體世界一流的工程團隊在設計和差異化其圖像傳感器時,考慮到這所有問題。

                雖然我們的測試包括受控的實驗室環境,但我們還在道路上測試我們的圖像傳感器,以捕獲真實世界的場景。

                 我們已為您做了測試。了解安森美半導體汽車圖像傳感器用于ADAS感知、人類視覺和自動駕駛汽車的更多信息。

                請閱讀“在路上系列”的前幾篇博客:

                標簽:CMOS, CMOS Image Sensor, Automotive
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