HDR

Product Introduction

Imaging capabilities in backlit and HDR environments have always been one of the core selling points of mobile phones, and a pain point for users. Ordinary photography cannot suppress highlights and restore dark details well at the same time. Tetras.AI has rolled out HDR photography product solutions for all weathers and situations. They allow for the ultimate experience while solving dynamic range limitations that ordinary photography faces in large lighting ratios, and solving image quality problems with dynamic range/color/ghost/contrast/clarity/detail/noise under high, medium, and low brightness and backlit environments. They also restore more layered to the dynamic range and color performance, and record snapshots that match how the human eye captures the world.

Our HDR photography products include HDR solutions for the RAW domain and YUV domain (it is easy to process luminance noise and color noise separately in the YUV domain solution; the RAW domain solution can combine multiple frames to achieve better image quality, as it is less affected by ISP and unaffected by non-linear brightness alignment). They also incorporate shooting functions under HDR, faceHDR, and other scenarios (outdoor backlight/side light, indoor high-low color temperature mixing, backlight, mixed indoor and outdoor light sources, and dark light). Superior user experience is achieved by maximizing the platform's computing power through heterogeneous computing and load balancing and scheduling. Our self-developed "multi-platform self-adaption" and "tuning" system ensures that the SDK can adaptively match new platform drivers and has efficient debugging and delivery capabilities under high concurrency and multi-project pressure.

Our HDR photography products employ the latest image processing and AI technology to process continuous multi-frame images received from the phone's front and rear cameras. They are also supported by multi-frame noise reduction, 1-4 stops of dynamic exposure fusion, dynamic exposure frame number and sequence, portrait enhancement, and other new technologies to optimize each image quality dimension in an HDR scene. We provide customers with whole-process delivery services, from sensor-adaptive exposure-control output, algorithm processing, ISP debugging, to patch integration.

Product Advantages

The advantages of our HDR photography solutions include:

1. Product scope: covers all-weather, full-scene, full-focal-length, and full-module in the RAW domain and YUV domain, including HDR and faceHDR.

2. Delivery capacity: our self-developed "multi-platform self-adaption" and "tuning" system ensures that the SDK can adaptively match new platform drivers and has efficient debugging and delivery capabilities under high concurrency and multi-project pressure.

3. User experience: superior user experience and enhanced image quality are achieved by maximizing the platform's computing power through heterogeneous computing and load balancing and scheduling. At the same time, the solutions support multi-frame streaming processing, further improving the overall experience of the time-intensive photography process.

4. Superior image quality: various usage scenarios are customized and optimized with the latest image processing and AI technology, resulting in a more layered dynamic range. Backlit portraits are bright, vibrant, and saturated with no overflow. There is no noticeable or severe ghosting of moving objects. Pictures are clean and clear, and portraits present rich details and natural skin color.

Key Technologies

AI Exposure

3-4 stops of dynamic exposure fusion, and dynamic exposure frame number and sequence are used to make scenes bright and transparent, especially backlit portrait scenes. Robust highlight suppression and dark detail restoration functions are also provided; the dynamic range is more layered and eliminates ghosting caused by moving objects.
AI Noise Reduction

Multi-frame noise reduction and AI noise reduction are used to judge the level and form of noise in different areas of the picture to remove noise (luminance noise and color noise) while retaining sufficient detail and texture, balancing noise and detail.
AI Image Quality Enhancement

Varying degrees of exposure and inter-frame redundancy information are employed, and high resolution is achieved through AI image quality enhancement to restore even more picture detail, resulting in picture quality that is pure and clear.
AI Portrait Enhancement

Face verification and AI portrait enhancement technology are used to make facial brightness natural, light and shadow uniform, clearly defining facial features and making skin color natural in portrait photos.

Application Scenarios

Supports outdoor backlight/side light, indoor high-low color temperature mixing, backlight from mixed indoor and outdoor light sources, dark light, and other portrait and non-portrait usage situations
Supports HDR effects when zooming
Supports front and back main cameras, wide angle, and other modules across the full range