AKARI机载红外相机（IRC）中红外通道拍摄数据的图像质量表征和改进
Characterization and Improvement of the Image Quality of the Data Taken with the Infrared Camera (IRC) Mid-Infrared Channels onboard AKARI
摘要：
中红外图像经常受到伪影和扩展点扩散函数（PSF）的影响。我们研究了AKARI机载红外相机（IRC）在S7（7μm）、S11（11μm）、L15（15μm）和L24（24 μm）四个中红外波段获得的图像中伪影和PSF的特性。去除伪影显著提高了L15和L24波段平场参考数据的可靠性。一组模型的IRC的PSF也构造从在轨数据。这些PSF具有来自检测器阵列内的衍射和散射的扩展分量。我们估计了点源的孔径校正因子和漫射源的表面亮度校正因子。我们的结论是，表面亮度校正因子的范围从0.95到0.8，考虑到扩展组件的PSF。为了校正扩展的PSF效应用于微弱结构的研究，我们还开发了一种图像重建方法，该方法包括与PSF的反卷积和与适当的高斯的卷积。适当地去除伪影，改进的平场，以及使用扩展PSF的图像重建，使我们能够在IRC中红外图像中研究扩展源的详细结构。
英文摘要：
Mid-infrared images frequently suffer artifacts and extended point spread functions (PSFs). We investigate the characteristics of the artifacts and the PSFs in images obtained with the Infrared Camera (IRC) onboard AKARI at four mid-infrared bands of the S7 (7μm), S11 (11μm), L15 (15μm), and L24 (24 μm). Removal of the artifacts significantly improves the reliability of the ref- erence data for flat-fielding at the L15 and L24 bands. A set of models of the IRC PSFs is also constructed from on-orbit data. These PSFs have extended components that come from diffraction and scattering within the detector arrays. We estimate the aperture correction factors for point sources and the surface brightness correction factors for diffuse sources. We conclude that the surface brightness correction factors range from 0.95 to 0.8, taking account of the extended component of the PSFs. To correct for the extended PSF effects for the study of faint structures, we also develop an image reconstruction method, which consists of the deconvolution with the PSF and the convolution with an appropriate Gaussian. The appropriate removal of the artifacts, improved flat-fielding, and image reconstruction with the extended PSFs enable us to investigate de- tailed structures of extended sources in IRC mid-infrared images.
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