Enhancement method for low illumination image of UAV aerial photography under the condition of uneven illumination
The high and low frequency parameters are not enhanced when the image is enhanced,and the details of the image are not preserved and its brightness is not balanced well.Therefore,a method for enhancing low illumination images of UAV aerial photography under the condition of uneven illumination is proposed.The UAV aerial photography image is preprocessed by Gaussian filter to achieve noise suppression of the image.The preprocessed image is decomposed by wavelet to obtain the image high frequency parameters and low frequency parameters,and the low frequency parameters and high frequency parameters are enhanced by bilateral filtering algorithm,soft threshold method and histogram,respectively.The high frequency parameters and low frequency parameters of the enhanced image are reconstructed by wavelet reconstruction,and the enhanced UAV aerial photography image is obtained.Experimental verification shows that the method can achieve a better effect of image enhancement.The proposed algorithm enhances the original brightness by 8.14%,the contrast by 37.90%and the sharpness by 31.01%on the basis of the original image,which makes the overall quality of the image improved significantly.In addition,the proposed algorithm can provide more accurate and rich information for subsequent image analysis and processing.
万方数据
维普
