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Method and system for processing images

An image and image area technology, applied in the field of image filtering based on image gradient, can solve problems such as complex processes

Active Publication Date: 2021-02-02
IMAGINATION TECH LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Motion in a scene due to dynamic objects or parallax could conceivably be tracked, but this would require a complex process which would generally require too much time and processing power to be implemented in real-time on mobile devices such as smartphones, A tablet, smart watch or other suitable mobile device on which HDR processing can be performed and where processing power can be limited

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  • Method and system for processing images
  • Method and system for processing images
  • Method and system for processing images

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Embodiment Construction

[0025] The issue of handling motion when combining images to form an HDR image was mentioned above. As mentioned above, if the transitions between the images used to form the HDR image are sharp, they may be noticeable in the HDR image, which may be perceptually disadvantageous. To fix this, the transition can be smoothed over a range of pixels so that the transition is not so sharp. The inventors have realized that in order to avoid creating visible (ie, noticeable) seams in the combined images, the transitions between source images are preferably approximately as smooth as the local image textures. That is, the rate at which the transition occurs is preferably related to the image gradient of the image region on which the transition occurs. For example, in smooth image regions (i.e., image regions with small image gradients), such as image regions showing the sky or painted surfaces such as walls, the transitions between the images used to form the fused image are preferabl...

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Abstract

Embodiments of the invention generally relate to image gradient based image filtering. In particular, an image processing method and system are described in which a filtering operation is applied to an image, wherein the filtering operation uses a filtering cost based on image gradients in the image. In this way, the image data for an image region is filtered depending on the image gradient for the image region. This can be useful in different situations, for example when combining images to form a high dynamic range (HDR) image. Filtering operations may be used as part of determining a connectivity unit of connected image regions and / or filtering operations may be used as part of a fusion unit of fusing two or more images together to form a fused image.

Description

technical field [0001] Embodiments of the invention relate generally to image processing, and in particular to image filtering based on image gradients. Background technique [0002] Cameras are used to capture images. One of the fundamental limitations on light sensors in digital cameras is their dynamic range, which describes the ratio between the minimum and maximum light intensity detectable by the light sensor. While quantization plays an important role in the achievable dynamic range, the limitations are often primarily physical in nature. The minimum detectable light intensity depends on sensor element size, efficiency and noise floor. Individual pixels are often extremely small in compact devices, resulting in a low probability of capturing photons in low-light conditions and a high susceptibility to interference from various noise sources and neighboring pixels. The maximum detectable light intensity may be determined by the maximum amount of charge that a sensor...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/21H04N5/217
CPCH04N5/211H04N25/63G06T5/007G06T2207/20208G06T5/50G06T2207/20012G06T2207/20024G06T2207/20212H04N23/741G06T5/002G06T5/20G06T11/60
Inventor R·莱克蒙德
Owner IMAGINATION TECH LTD
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