# US 9,883,112 B1 · High dynamic range imaging

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- Number: US 9,883,112 B1
- Document ID: US9883112B1
- Status: Granted
- Kind: B1
- Application number: 15/272,904
- Filed: 2016-09-22
- Granted: 2018-01-30
- Earliest claimed: 2016-09-22
- Assignees: Pinnacle Imaging Corporation
- Applicants: Pinnacle Imaging Corporation
- Inventors: Vanjushin Igor' Valer'Evich
- Web page: https://patentgrep.com/patent/US9883112B1

## CPC

- H04N 23/72: Combination of two or more compensation controls
- G06T 3/4015: Image demosaicing, e.g. colour filter arrays [CFA] or Bayer patterns
- G06T 5/50: using two or more images, e.g. averaging or subtraction
- G06T 5/92: based on global image properties
- H04N 23/667: Camera operation mode switching, e.g. between still and video, sport and normal or high- and low-resolution modes
- H04N 23/741: by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors
- H04N 25/13: characterised by the spectral characteristics of the filter elements
- G06T 2207/10024: Color image
- G06T 2207/10144: Varying exposure
- G06T 2207/20208: High dynamic range [HDR] image processing
- G06T 2207/20221: Image fusion; Image merging
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

A high dynamic range video processing method performs merging and tone mapping techniques after a Bayer filter mosaic technique is performed and then converts it to red green blue (RGB) at the end as opposed to converting into RGB at the beginning and then performing merging and tone mapping after. The HDR processing is performed on Bayer-mosaic images and no de-mosaicing and color space conversions are required. The merging procedure has two modes: full-reset merging and LDR-updated merging. The first mode, full-reset merging, creates an HDR frame once the system has all image frames captured. The second mode, LDR-updating merging, means that any new HDR frame is obtained by an updating of a previous HDR frame with a new LDR frame data.

## Claims

### Claim 1

A high dynamic resolution video processing method comprising:
passing light through a Bayer filter;
capturing the light by an image capture device to create a Bayer-mosaic image;
performing merging techniques on the Bayer-mosaic image, the merging techniques comprising a full-reset merging mode and a low dynamic range-updated merging mode;
performing tone mapping techniques on the Bayer-mosaic image;
converting results of the merging techniques and the tone mapping techniques to red green blue (RGB) data; and
outputting a high dynamic range image from the red green blue data;
wherein, during merging techniques, four frames of different exposures are used per high dynamic range capture; and
wherein the low dynamic range-updated merging mode comprises updating a previous high dynamic range frame with a new low dynamic range frame data to obtain a new high dynamic range frame.

### Claim 2

A high dynamic resolution video processing method comprising:
passing light through a Bayer filter;
capturing the light by an image capture device to create a Bayer-mosaic image;
performing merging techniques on the Bayer-mosaic image, the merging techniques comprising a full-reset merging mode and a low dynamic range-updated merging mode;
performing tone mapping techniques on the Bayer-mosaic image;
converting results of the merging techniques and the tone mapping techniques to red green blue (RGB) data; and
outputting a high dynamic range image from the red green blue data;
wherein, during merging techniques, four frames of different exposures are used per high dynamic range capture; and
wherein the low dynamic range-updated merging mode comprises updating a high dynamic range frame with low dynamic range frames at a frame rate of the low dynamic range frames.