Abstract
Compositing multiple exposure images with different exposure values has attracted lot of attention in the field of computational photography. There are lot of approaches to fuse multiple exposure images, in various domains like the transform domain and filtering-based approaches. Out of these, we propose here a Haar wavelet-based transform domain approach for fusing multiple exposure images. The input image stack is first sub-divided into a four layer decomposition comprising of the average, horizontal, vertical, and diagonal blocks. Then, each of the corresponding blocks is fused using a fusion rule using a coefficient matrix and then averaged. The Haar wavelet-based decomposition results in orthonormal basis functions over unit intervals which helps in processing high-frequency regions in the image stack. We get a good compression efficiency using Haar wavelets which can be used further to build compressed HDR images in HDR photography. We avoid multi-scale and pyramidal decompositions and determination of quality parameters, such as hue, saturation, and well-exposedness, thus reducing the computational and coding complexities.
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Data Transparency/Availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
Code Availability
The codes written during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We would like to thank Erik Reinhard University of Bristol , for the set of nine chameleon images shown in Fig. 1. We would like to thank Tom Mertens, Jan Kautz, and Frank Van Reeth for providing us with code of Exposure Fusion algorithm and also with the set of multiple exposure house images in Fig. 14. We would like to thank the CAVE Computer Vision Laboratory, Columbia University for making available the multiple exposure images from their database shown in Figs. 6, 7, 16, 18, 20, and 22.
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Ramakrishnan, V., Pete, D.J. Haar Wavelet-Based Fusion of Multiple Exposure Images for High Dynamic Range Imaging. SN COMPUT. SCI. 3, 129 (2022). https://doi.org/10.1007/s42979-021-01010-y
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DOI: https://doi.org/10.1007/s42979-021-01010-y