A Method of Image Enhancement for Adaptive Illumination Compression
An image compression and adaptive technology, applied in the field of image processing, can solve the problems of limited range of digital image intensity values, difficult to identify image content, etc.
Active Publication Date: 2015-12-09
THE SECOND RES INST OF CIVIL AVIATION ADMINISTRATION OF CHINA
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[0017] The technical problem to be solved by the present invention is: the intensity value range of the digital image existing in the prior art is limited, and under relatively high dynamic illumination conditions, the image intensity value comes from the illumination rather than the scene information, and it is difficult to identify the problem of the image content , the present invention proposes a new self-adaptive light compression image enhancement algorithm aimed at improving the contrast of image content by compressing light in a high dynamic light environment, and enhances the image value changes introduced by compressing light intensity, thereby improving the image quality. Recognizability
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[0058] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.
[0059] Any feature disclosed in this specification (including any appended claims, abstract), unless otherwise stated, may be replaced by alternative features that are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.
[0060] Related instructions:
[0061] 1. Basic principle: The technology used first estimates the intensity of incident light in each area of the image, and then eliminates the change in gray value of the image caused by the change of incident light intensity in the image. The second step can also be considered as normalizing the incident light intensity. The numerical range of digital images is limited, compressing the incident light intensity into the normal ra...
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The invention relates to the technical field of image processing, in particular to an adaptive illumination compressed image intensification algorithm. The adaptive illumination compressed image intensification algorithm aims at solving the problem existing in existing computation, improves an image content contrast ratio and achieves a purpose of image intensification by compressed illumination in a high-dynamic illumination environment. According to the adaptive illumination compressed image intensification algorithm, quick illumination estimation is performed by image incident light channel estimation and a window integral method, illumination estimation is improved adaptively by an edge preserving algorithm, and an illumination classification compression algorithm and the like are performed to achieve the scheme of the adaptive illumination compressed image intensification algorithm. The adaptive illumination compressed image intensification algorithm is applied to the field of the adaptive image processing.
Description
technical field [0001] The invention relates to the technical field of image processing, in particular to an adaptive illumination compression image enhancement algorithm. Background technique [0002] Digital images have a limited range of intensity values, such as common 8-bit grayscale values ranging from 0 to 255. The lighting environment where the camera collects images may have a high dynamic range, such as direct sunlight and shadows. In this way, the image intensity values collected in weakly illuminated areas are all low, and the image intensity values collected in strong illuminated areas are all high. However, within the area, the difference in intensity values is very small, and it is difficult to identify the content of the image. [0003] When digital cameras and video cameras acquire images, due to the influence of uneven lighting, it will cause uneven exposure of the image, some areas are too bright / dark, low contrast, difficult to identify and other...
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IPC IPC(8): G06T5/00
Inventor 隋运峰鄢丹青钟琦李华琼
Owner THE SECOND RES INST OF CIVIL AVIATION ADMINISTRATION OF CHINA