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A method and apparatus for dynamic range enhancement of an image

A dynamic range and image technology, applied in image enhancement, image analysis, image communication, etc., can solve the problems of increased possibility, limited time proximity, speed of reading images, increased difficulty, etc., to reduce complexity, The effect of simple and user-interactive methods, effective user-interactive methods

Inactive Publication Date: 2016-03-30
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology

[0005] Also, the temporal proximity of multiple captures is limited by the speed at which images can be read from the image sensor
A larger time gap between captures increases the likelihood that there is motion (ie, whether camera motion related to hand shake, or scene motion caused by objects moving in the scene) between the captures
Motion increases the difficulty of fusing multiple images into a single output image
[0006] Additionally, HDR images from multiple exposure images produce increased shadows, mid-tones, and highlighted detail, which may not be optimal for user expectations

Method used

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  • A method and apparatus for dynamic range enhancement of an image
  • A method and apparatus for dynamic range enhancement of an image
  • A method and apparatus for dynamic range enhancement of an image

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Embodiment Construction

[0031] discussed below in this patent document Figures 1 to 11d And the various examples used to describe the principles of the disclosure are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged systems and methods. Embodiments herein and their various features and advantageous details are explained more fully with reference to non-limiting embodiments shown in the drawings and explained in detail in the following description. Descriptions of well-known components and processing techniques are omitted so as not to unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of the various ways in which the embodiments herein may be practiced and also to enable those skilled in the art to practice the embodiments herein. Accordingly, ...

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Abstract

A method and apparatus are provided for enhancing the local dynamic range of an image using the contents of exposure bracketed image set without affecting overall dynamic range of the image. The method allows a user to select at least one region of a reference image for enhancement after receiving the reference image from the user. Further the method comprises segmenting the reference image by using exposure weights, and selects an enhancement support image from an exposure bracketed image set. Furthermore the method determines weight maps of reference and enhancement support images and generates dynamic range enhanced reference image using determined weight maps.

Description

technical field [0001] The present disclosure relates to a method and apparatus for enhancing the dynamic range of an image, and more particularly, to a method and apparatus for enhancing the local dynamic range of an image using the content of an exposure bracketed image. Background technique [0002] Image sensing devices, such as charge-coupled devices (CCDs), are commonly found in products such as digital cameras, scanners, and video cameras. These image sensing devices have a very limited dynamic range when compared to conventional negative film products. The image sensing device has a dynamic range of about five f-stops. [0003] Additionally, it is often the case that a scene has a very wide dynamic range due to multiple light sources (eg, front-lit and back-lit portions of the scene). In the example of a wide dynamic range scene, selecting an appropriate exposure for the subject often requires clipping data in another part of the image. Therefore, the low dynamic ...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T3/00
CPCG06T2207/10144G06T2207/20221G06T5/50H04N23/743H04N23/741G06T5/94G06T5/00H04N23/81
Inventor 普拉·卡什·帕布赛萨布里·拉朱·尚穆根纳拉辛哈·戈帕尔克里希纳·派
Owner SAMSUNG ELECTRONICS CO LTD
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