Sony FCB camera block
The 130dB wide dynamic range (WDR) of SONY FCB-EV9520L is its core capability to cope with extreme light contrast, achieved through the collaborative innovation of software and hardware. Danny Wong, a senior engineer from Xuanzhan Technology, conducted an analysis from two aspects: the technical implementation principle and comparative advantages.
I. Implementation Principle of 130dB Wide Dynamic Range
1. Hardware foundation: STARVIS 2 CMOS sensor
Back-illuminated structure: The sensor of SONY FCB-EV9520L adopts deep photodiode and diffraction grating technology, enhancing the absorption efficiency of long-band light and significantly improving the light-sensing ability (with a sensitivity twice that of traditional sensors).
Dual gain output: The STARVIS2 CMOS sensor of SONY FCB-EV9520L simultaneously outputs two signals: high gain (for details in dark areas) and low gain (for details in bright areas), providing a raw data foundation for HDR synthesis.
2.Dual HDR mode coordination
DOL HDR (Digital Overlay HDR) : The SONY FCB-EV9520L captures short exposure (bright areas) and long exposure (dark areas) images and synthesizes single-frame high dynamic range images through algorithms. However, artifacts may occur in high-speed motion scenes.
Clear HDR (Artifacts Free HDR) : A breakthrough in core technology, simultaneously outputting low-gain and high-gain images, and real-time synthesis of a single HDR image without motion blur or color difference. It is especially suitable for vehicles traveling at high speeds in traffic monitoring.
3.Partition processing algorithm
Wide-D mode: The SONY FCB-EV9520L divides the image into multiple independent areas for processing, dynamically enhancing the brightness of dark areas and suppressing overexposure in bright areas to achieve global light balance.
Ii. Comparative Advantages over Other brands
1. Dynamic range and detail restoration capability
Eye-level dynamic range: The 130dB wide dynamic range of SONY FCB-EV9520L is close to the human eye limit (120dB), far exceeding the mainstream level of the industry. For instance, in the tunnel entrance scene, the overexposure rate of license plates is reduced, thereby enhancing the recognition rate.
Hardware-level wide dynamic range: The back-illuminated structure of the STARVIS2 sensor in SONY FCB-EV9520L doubles the light-sensing efficiency compared to traditional front-illuminated sensors (such as SONY FCB-EV7520/FCB-CV7520), and retains color details even in a low light of 0.009Lx.
2. Adaptability to sports scenarios
Gap-free compositing: The Clear HDR technology of SONY FCB-EV9520L resolves the motion blur issue that occurs during exposure compositing, making it suitable for high-speed aerial photography by drones or traffic monitoring.
Dynamic target tracking: Combining area auto exposure and Super+ image stabilization, it can stably capture bolt torque marks even in the vibrating environment of the automotive assembly line.
3. Light and dark coordination and color fidelity
Seamless day and night switching: Automatically remove the infrared filter to enhance strong light response, maintain full-color imaging (0.009Lx) in low light conditions, no infrared supplementary lighting required.
Three-zone independent control: The picture is divided into 6×8 grid zones, allowing for independent adjustment of focus/exposure/white balance. Accurately restore the color of tissue blood vessels in medical surgeries.
Conclusion
The 130dB wide dynamic range of SONY FCB-EV9520L is not a single technological breakthrough, but a systematic solution based on the STARVIS 2 sensor as the hardware foundation, with dual HDR modes working in coordination as the core, and optimized area auto exposure/area auto focus/area auto white balance as the guarantee.