When taking pictures in low-light scene, due to the insufficient light, we are often posed to the following problem: Using short exposure setting, image tends to be dim and noise, but with a sharp outline. While using longer exposure setting, image captures more color and detail information, but with partly blurred areas. A very common situation, none of those images is good enough. Good brightness and color information are retained in long-exposure images, while sharp outlines are retained in shorter ones. In this paper, we propose a fusion method based on wavelet decomposition for such low-light image pair. In this work, we firstly decompose the original image pair into different frequency subbands. After that, we compute the importance weight maps according to the difference value between corresponding subbands. In order to refuse artifacts and ghost, we compute weight maps in Gauss model. Finally, the coefficients of subbands are blended into a high-quality fusion image. Experimental results show that the proposed method effectively preserves sharp edges of the short-exposure image, and maintains the color, brightness, and details of the long-exposure image.
KEYWORDS: Image enhancement, RGB color model, High dynamic range imaging, Visualization, Visual process modeling, Image quality, Visibility, Image analysis
The images captured from environment often suffer from low contrast and visual quality due to the bad imaging conditions like low light or haze weather. Many methods have been proposed based on traditional image enhancement models including dehazing model and Retinex model typically. However, their scopes are limited and specific. In this paper, we propose a simple but effective method to enhance images contrast and keep the good visual quality. By observing the traditional image enhancement models including dehazing model and Retinex model, a general normalized model is proposed. To preserve the image details and control the brightness, we introduce dual boundaries called the dark and bright boundary to handle the low light and high light condition. After getting the dark and bright boundary, the images are enhanced accordingly. Experiments show our method can be applied in many bad imaging conditions and keep good performances.
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