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Camera wide dynamic image enhancement method and device

A wide dynamic image and camera technology, applied in image enhancement, image data processing, image signal generator, etc., can solve the problems of image detail loss, image contrast reduction, etc., achieve good wide dynamic effect, improve image contrast, and wide The effect of the motion picture effect

Active Publication Date: 2014-12-03
英飞拓(杭州)信息系统技术有限公司
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  • Application Information

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Problems solved by technology

The method based on curve transformation maps the original data to the corresponding transformation space by constructing logarithmic transformation, exponential transformation or self-defined curve transformation formula, so as to achieve the purpose of enhancing the wide dynamic range of the image, but the details of the image are also changed during the transformation process. Loss, which reduces the contrast of the transformed image

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  • Camera wide dynamic image enhancement method and device
  • Camera wide dynamic image enhancement method and device
  • Camera wide dynamic image enhancement method and device

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but not as a basis for limiting the present invention.

[0032] Example. The inventive device such as figure 1 As shown, it consists of a curve stretching module 12 and a contrast enhancing module 13. The curve stretching module 12 completes the analysis of the brightness enhancement factor from the RGB data source 11, uses the brightness enhancement factor as a parameter to design a stretching curve, and stretches the brightness of the image to obtain a stretched image. The contrast enhancement module 13 performs contrast enhancement on the stretched image to obtain the final wide dynamic image.

[0033] figure 2 is a flowchart representing the curve stretching module of the present invention.

[0034] Such as figure 2 As shown, the detailed steps of the curve stretching module of the preferred embodiment of the present invention are as follows: ...

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Abstract

The invention discloses a camera wide dynamic image enhancement method and a device. Pixel mean values of a bright pixel area and a dark pixel area of images in original image data are respectively and statistically figured out, brightness increase factors are obtained by means of different value ranges of the pixel mean values, the brightness increase factors are used as parameters and an index curve is used so that original images are mapped once to obtain stretched images, the stretched images are subjected to gaussian blur processing to obtain low frequency image spectrum of the stretched images, and a specific value of the low frequency image spectrum to the stretched images is used as a parameter to perform contrast ratio improvement for the stretched images so as to finally obtain wide dynamic images.

Description

technical field [0001] The invention relates to an image processing method and device, in particular to a camera wide dynamic image enhancement method and device. Background technique [0002] Wide dynamic technology is a technology used to allow the camera to see the characteristics of the image under very strong contrast. When high-brightness areas illuminated by strong light sources (sunlight, lamps, or reflections, etc.) and relatively low-brightness areas such as shadows and backlights exist in the image at the same time, the image output by the camera will appear bright areas that become white due to overexposure. However, dark areas become black due to underexposure, seriously affecting image quality. The performance of the camera in the brightest area and the darker area in the same scene is limited. This limitation is commonly referred to as "dynamic range". [0003] There are two types of traditional WDR enhancement methods: one is based on curve transformation, ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/04G06T5/00
Inventor 张真李文德叶剑凌云
Owner 英飞拓(杭州)信息系统技术有限公司