HDR+ was introduced on the Nexus 6 and brought back to the Nexus 5. HDR+ also reduces shot noise and improves colors, while avoiding blowing out highlights and motion blur. HDR+ also uses Semantic Segmentation to detect faces to brighten using synthetic fill flash, and darken and denoise skies. When the shutter is pressed the last 5–15 frames are analysed to pick the sharpest shots (using lucky imaging), which are selectively aligned and combined with image averaging. HDR+ takes continuous burst shots with short exposures. Unlike earlier versions of High-dynamic-range (HDR) imaging, HDR+, also known as HDR+ on, uses computational photography techniques to achieve higher dynamic range. The Pixel 4 introduced the Pixel Neural Core. The Pixel 2 and Pixel 3 (but not the Pixel 3a) include the Pixel Visual Core to aid with image processing. The first generation of Pixel phones used Qualcomm's Hexagon DSPs and Adreno GPUs to accelerate image processing. Starting with Pixel devices, the camera app has been aided with hardware accelerators to perform its image processing.
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