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13 November 2010 Pixel discontinuity handling of ortho-rectification images for airborne pushbroom imager
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Abstract
Because of aircraft vibration, pixel discontinuity (blank pixels) occurs frequently in ortho-images when using a top-down approach and a nearest neighboring resampling method for pushbroom images. In this paper we propose a scheme to handle the pixel discontinuity. The pixel discontinuity is induced by the attitude variation in pitch and heading of an airplane. The deviation of pixel locations needs to be analyzed first to check if the proposed scheme is applicable. We use a linear CCD imager installed on a stabilizer to filter out the high frequency noise in an airplane for image acquisition. This scheme is suitable since the angular rates of the pitch and heading are both within ±0.7°/sec statistically and the deviation of the pixel locations is less than 1.0 pixel. The proposed scheme includes the following steps: (1) Derive the pixel locations of ortho-images using a top-down approach. Then allocate the pixel values to its 4 neighboring grids by an inverse bilinear interpolation based on their weighted factors in ortho-images. (2) After completing the ortho-rectification of full images, perform the dynamic range adjustment on the ortho-images according to the maximum pixel value of raw images and ortho-images. After applying the proposed scheme, we find that the pixel discontinuity is removed and the image quality is improved substantially. The difference of pixel value between raw images and ortho-images is also presented at regions with low, middle and high radiance to evaluate the proposed scheme quantitatively.
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Jyun-Yi Lai, Ming-Fu Chen, Tzu-Hsuan Wei, Chia-Yen Chan, and Ting-Ming Huang "Pixel discontinuity handling of ortho-rectification images for airborne pushbroom imager", Proc. SPIE 7857, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques, and Applications III, 78570U (13 November 2010); https://doi.org/10.1117/12.869461
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