七月 31, 2024
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Accurate image depth and detail is essential in security cameras, facial recognition devices and machine vision devices to deliver a more impactful and high-fidelity viewing experience. In order to achieve image depth and detail, certain image sensor features are necessary for applications; one feature that’s important is Adaptative Local Tone Mapping
onsemi has recently released the AR0246, which is part of the Hyperlux LH image sensor family. This image sensor is a 2 MP 1/4−inch Back-Side Illuminated (BSI) Stacked CMOS digital image sensor with a 1920 x 1080 active−pixel array. This advanced sensor captures images in either linear, enhanced Dynamic Range (eDR) or embedded High Dynamic Range (eHDR with 120dB) modes, with a rolling−shutter readout. It also includes a feature known as adaptive local tone mapping (ALTM), which packs high dynamic range images in reduced bit depth to be used on non- high dynamic range (HDR) processors or display devices which have reduced bit depth. In this blog, you will get to know ALTM function and its benefits.
Adaptive Local Tone Mapping (ALTM) is an important technique in the field of High Dynamic Range (HDR) imaging. It is designed to process HDR images, which contain a wider range of luminance levels than can be captured by conventional digital cameras. Its aim is to simulate the human visual system’s response to light and contrast. This feature combines global and local adaptation to achieve tone mapping, ensuring that the mapped image retains the original contrast relationships while enhancing its overall appearance. ALTM enhances HDR images while maintaining its naturalness and preserving details. HDR is a significantly important feature for almost all applications with a camera, such security and surveillance, carDVR, facial recognition. Design engineers will need ALTM to get the best image quality in their products. ALTM, enables 12-bit linear ISPs (not HDR enhanced) to process 120 dB images and videos.
The AR0246 implements ALTM in the Bayer domain. The advantage of doing tone mapping on the Bayer domain is that common 10−bit or 12−bit pipelines may be used for the HDR image rendering. TheAR0246 provides benefits for low-end ISP, which include:
The AR0246 can also achieve the following computation on chip to transmit low bandwidth embedded HDR:
Due to the features above, the SoC/ISP can process the HDR image with reduced processing bit-depth and thus also get higher frame rate.
Overall, ALTM combines local and global adjustments, reduces artifacts, and ensures detail preservation, making it a valuable technique for improving HDR images. This feature is very valuable in applications like wearable cameras, carDVR, facial recognition and more.
Learn more about the AR0246 image sensor and the Hyperlux LH family.
With the most image sensor offerings from VGA up to 45 MP, onsemi has the right sensor for your machine vision application.
Our intelligent sensing solutions are developed with decades of imaging expertise and proprietary pixel design processes, delivering the best quality and efficient image capture. Offering unique features tailored to the machine vision market, onsemi image sensor families provide the industry’s best global shutter efficiency and frame rates exceeding modern camera needs. These features, alongside system components designed specifically for our sensors, allow you to design reliable inspection cameras that capture high-quality images without blurriness.
onsemi has developed a new 2.1 µm super-exposure pixel image sensor family - Hyperlux, with a unique set of features that cater to both sensing and viewing camera applications. Hyperlux sensors range from 3 Megapixel (MP), 8MP and higher, capable of capturing unmatched 150 dB high dynamic range (HDR) images with 120 dB single exposure flicker free range. The Hyperlux family keeps all signal-to-noise ratio (SNR) transitions at 30 dB and above, even at high temperatures (up to +100°C junction). In low light conditions, these sensors outperform their counterparts with same sized pixel across extreme temperature conditions. This unique sensor family also boasts the lowest power consumption in the smallest form factor enabling an efficient camera design.
onsemi provides a diverse portfolio of image sensors with innovative features and capabilities by delivering excellent image quality at low power consumption. This portfolio addresses a wide variety of applications such as biometric scanners, facial recognition systems, state-of-the-art surveillance cameras, and security & safety systems.
Our image sensors are built to overcome challenging lighting conditions by offering wide dynamic range and low-light performance to give your device the best results in any circumstance. onsemi offers a comprehensive image sensor product portfolio that supports low power consumption. Our best-in-class image sensor development ecosystem software saves design time and enables short time to market (TTM).
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Jason Wang
Product Marketing Engineer
