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Image processing device and method to perform local contrast enhancement

An image processing device, a technology of local contrast, applied in image enhancement, image data processing, image analysis, etc., can solve problems such as contrast and detail loss

Active Publication Date: 2020-10-27
HANWHA TECHWIN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these tone mapping methods may suffer from loss of local contrast and detail, especially in dark areas

Method used

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  • Image processing device and method to perform local contrast enhancement
  • Image processing device and method to perform local contrast enhancement
  • Image processing device and method to perform local contrast enhancement

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Embodiment Construction

[0051] In the following description, for the purpose of explanation, many specific details are set forth in order to provide a thorough understanding of various exemplary embodiments or implementations of the present invention. As used herein, "implementation" and "implementation" are interchangeable words, which are non-limiting examples of devices or methods that adopt one or more of the inventive concepts disclosed herein. However, it is obvious that the various exemplary embodiments may be practiced without these specific details or with one or more equivalent arrangements. In other instances, well-known structures and devices are shown in the form of block diagrams to avoid unnecessarily obscuring various exemplary embodiments. In addition, the various exemplary embodiments may be different, but need not be exclusive. For example, without departing from the concept of the present invention, the specific shape, configuration, and characteristics of an exemplary embodiment ...

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Abstract

A image processing device includes a first interface to receive a first frame having a first pixel value with a first dynamic range; a dynamic range converter to convert the first pixel value having the first dynamic range into a second pixel value having a second dynamic range according to a conversion gain factor to generate a second frame having the second pixel value with the second dynamic range, the second dynamic range being less than the first dynamic range; a weight generator to receive the conversion gain factor and to generate a first contrast weight signal depending on the conversion gain factor; and a contrast modifier to enhance a local contrast of the second frame by adjusting the second pixel value of the second dynamic range based on the first contrast weight signal.

Description

[0001] background Technical field [0002] The present invention generally relates to electronic devices and methods for processing video frames, and more specifically, to image processing devices and methods for performing local contrast enhancement. Background technique [0003] Recently, users' demands for image capturing devices such as digital cameras, digital camcorders, and camera phones are rapidly increasing. Therefore, image capture devices have become more complex and have more diverse functions. [0004] Wide dynamic range imaging refers to a technology that more accurately represents the brightness range that human vision can adapt to when viewing real natural scenes in digital images. For example, a video frame with a wide dynamic range can be obtained by capturing a short exposure image and a long exposure image and synthesizing the captured images. Wide dynamic range imaging can be used for various applications, such as medical imaging, satellite imaging, physical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235
CPCH04N23/741H04N23/73H04N23/80G06T2207/20208H04N23/60G06T5/94G06T5/20G06T5/50H04N23/743
Inventor 李畅玟
Owner HANWHA TECHWIN CO LTD