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US 12,718,336 B2Granted
Cascade image processing for noise reduction
AssigneeQUALCOMM Incorporated
InventorsQuanmin Shen, Zhongshan Wang, Wen-Chun Feng, Chi Zhang
Life of this patent
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Abstract
This disclosure provides systems, methods, and devices for image processing that support noise reduction in low-light video sequences. The noise reduction is accomplished through a cascaded set of operations that are configured based on each set of operations location within the cascaded pipeline. The cascade may be implemented as a series of cascaded image post-processing engines (IPEs) within an image signal processor (ISP).
Claims24
A method, comprising:
- receiving a first image frame;
- processing the first image frame through a first pass in an image correction algorithm having a first configuration to generate an intermediate first image frame, wherein the first configuration results in the processing including a first set of operations related to a first noise reduction operation;
- and
- processing the intermediate first image frame through a second pass in the image correction algorithm having a second configuration to generate a corrected first image frame, wherein the second configuration results in the processing including a second set of operations related to a second noise reduction operation, and wherein the second configuration includes applying a color correction matrix to the intermediate first image frame after applying the second noise reduction operation and before applying a second tone mapping to generate the corrected first image frame.
1 more element
A method, comprising:
- receiving a first image frame;
- applying a first noise reduction to the first image frame;
- applying a first tone mapping to the first image frame after applying the first noise reduction;
- applying a gamma correction to the first image frame after applying the first tone mapping;
- applying a second noise reduction to the first image frame after applying the gamma correction;
- applying a color correction matrix to the first image frame after applying the second noise reduction;
- applying a second tone mapping to the first image frame after applying the color correction matrix;
- and
- outputting a corrected first image frame after applying the first noise reduction, applying the first tone mapping, applying the gamma correction, applying the second noise reduction, applying the second tone mapping, and applying the color correction matrix.
6 more elements
An apparatus, comprising:
- an image signal processor comprising a plurality of image post-processing engines (IPEs) including at least a first IPE and a second IPE,
- wherein the image signal processor is configured to:
- receive a first image frame;
- process the first image frame using the first IPE to generate an intermediate first image frame;
- and
- process the intermediate first image frame using the second IPE to generate a corrected first image frame, wherein to process the intermediate first image frame using the second IPE includes to apply a color correction matrix to the intermediate first image frame after a second noise reduction and before a second tone mapping to generate the corrected first image frame.
3 more elements
An apparatus, comprising:
- a memory;
- and
- at least one processor configured to perform operations of:
- receiving a first image frame;
- processing the first image frame through a first pass in an image correction algorithm having a first configuration to generate an intermediate first image frame, wherein the first configuration results in the processing including a first set of operations related to a first noise reduction operation;
- and
- processing the intermediate first image frame through a second pass in the image correction algorithm having a second configuration to generate a corrected first image frame, wherein the second configuration results in the processing including a second set of operations related to a second noise reduction operation, and wherein the second configuration includes applying a color correction matrix to the intermediate first image frame after the second noise reduction operation and before a second tone mapping to generate the corrected first image frame.
4 more elements
Dependencies are inferred from the claim text.