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Noise processing method for dynamic range image and image capture device thereof

A dynamic range and noise processing technology, applied in the field of image processing, can solve problems such as inability to reduce noise, achieve the effect of solving noise discontinuity and improving quality

Inactive Publication Date: 2016-07-20
ALTEK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, each block in the synthesized high dynamic range image comes from multiple different low dynamic range images. Due to different exposure times, it is impossible to directly perform noise reduction processing based on the brightness distribution of the high dynamic range image.

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  • Noise processing method for dynamic range image and image capture device thereof
  • Noise processing method for dynamic range image and image capture device thereof
  • Noise processing method for dynamic range image and image capture device thereof

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Embodiment Construction

[0035] The present invention proposes an effective noise reduction method for high dynamic range images (HighDynamicRangeImage, HDRI). The present invention first mixes multiple low dynamic range images to generate a high dynamic range image, and sets the value by simultaneously referring to the weight setting value used in the mixing process and the gain setting value for tone reconstruction of the high dynamic range image It can effectively reduce the noise of the high dynamic range image by setting the intensity of the noise reduction. In order to make the content of the present invention clearer, the following examples are listed as examples in which the present invention can actually be implemented.

[0036] figure 1 is a block diagram of an image capture device according to an embodiment of the present invention. Please refer to figure 1 , the image capture device 100 of this embodiment is, for example, a digital camera, a single-eye camera, or a smart phone with a fu...

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Abstract

The invention provides a noise processing method and image capturing device of a dynamic range image. The method comprises: to began with, capturing a first image and a second image, wherein the exposure time of the first image is less than the exposure time of the second image; next, mixing the first image and the second image to produce the dynamic range image and recording weighting set values for mixing to be a weighting map; then, tone-reproducing the dynamic range image to produce a tone reproduced image and recording gain adjustment values of the dynamic range image corresponding to the tone reproduced image to be a gain map; and at last, setting noise reduction parameters for each pixel of the tone reproduced image based on the weighting map and the gain map respectively, and carrying out noise reducing treatment based on the noise reduction parameters so as to produce a noise-reduced dynamic range image.

Description

technical field [0001] The present invention relates to an image processing technology, and in particular to a noise processing method of a dynamic range image and an image capture device thereof. Background technique [0002] High Dynamic Range Images (HighDynamicRangeImages, HDRI) is an image technology used to achieve a larger exposure dynamic range (that is, a greater difference between light and dark) than traditional digital images. Since the range of luminance in nature visible to humans is quite wide, high dynamic range images are designed to accurately represent the distribution of luminance values ​​over a wide range from direct sunlight to the darkest shadows in the real world. [0003] Generally, what a digital camera captures is the amount of incoming light in an instant, so it presents a very limited brightness range, which means it belongs to a Low Dynamic Range Image (Low Dynamic Range Image, LDRI). In order to make up for the limitations of digital cameras,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/217H04N5/243
Inventor 周宏隆曾家俊
Owner ALTEK CORP