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NvidiaGranted patentCameras & imagingInterest 5/10

Nvidia patents method to fix colors in high dynamic range images

Patent drawing
Patent drawing from the official filing.

Nvidia describes a technique for processing images from high dynamic range (HDR) sensors that capture a wider range of light than standard cameras. The system compresses the brightness of the image to fit the processor's limits while using specific math to ensure the colors remain accurate and balanced.

Why it mattersThis helps ensure that photos taken with advanced camera sensors look natural and correctly colored, rather than washed out or distorted.

In the filing’s own words

Apparatuses, systems, and techniques to receive, at a processor associated with an image signal processing (ISP) pipeline, a target image captured using a sensor at a first bit-depth associated with the sensor, where the ISP pipeline is associated with a second bit-depth; apply one or more dynamic range compression operations to brightness values associated with the target image to obtain compressed brightness values; determine brightness gain values using the brightness values and the compressed brightness values; apply the brightness gain values to each color channel of respective pixels of the target image to obtain a compressed target image such that a color ratio of the compressed target image is preserved; and adjust a color correction matrix (CCM) associated with the ISP pipeline using the compressed target image.

What exactly they claim (claim 1)

1. A method comprising: receiving, using a processing device associated with an image signal processing (ISP) pipeline, a target image captured using a high dynamic range (HDR) sensor at a first bit-depth associated with the HDR sensor, the ISP pipeline being associated with a second bit-depth; applying one or more dynamic range compression operations to brightness values associated with the target image to obtain compressed brightness values; determining brightness gain values using the brightness values and the compressed brightness values; applying the brightness gain values to individual color channels of respective pixels of the target image to obtain a compressed target image that preserves a color ratio of the compressed target image; and adjusting a color correction matrix (CCM) associated with the ISP pipeline using the compressed target image as a calibration reference, including analyzing differences between color values of the compressed target image and corresponding known color values, and determining CCM coefficients based on the differences.

Facts

Company
Nvidia (NVIDIA Corporation)
Official title
Color correction matrix calibration for high dynamic range sensors
Patent number
US12756789B2
Application number
18419351
Filed
Jan 22, 2024
Granted
Oct 6, 2026
Inventors
1
Claims
20

Classified under

H04N 1/60 Electricity & electronicsG06T 9/00 Physics & computingG06V 10/56 Physics & computingG06V 10/60 Physics & computing
Read the full filing (official PDF) ↗ Open in the Patent Tracker

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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
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