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9 Image Reduction and Processing
• Deconvolution Deconvolution is a complex mathematical process that deblurs the
image by modelling the blurring from the point spread function (PSF). If there is
no blurring in the original image, deconvolution will have no effect.
• Erosion Erosion filters remove bright edges around stars, making them both
sharper and smaller.
• Kernel Filters A kernel filter applies a kernel, convolution matrix, or mask to the
image. This is basically a matrix. The matrix is moved over the image, which is
multiplied by the values with the matrix. The effect of the kernel filter is dependent
on the contents of the matrix. It may blur, sharpen emboss, or enhance edges,
depending on its parameters.
• FFT Filters A fast Fourier filter applies a Fourier transform to the image (recall
that an image can be treated as a series of waves). FFT filters are used to reduce
patterning on an image such as stripping.
• Digital Development Filters Digital development filters are a series of mathematical filters designed to make CCD images have a film-like response, i.e., nonlinear.
They bring out faint detail and reduce bright sources.
9 Image Reduction and Processing
• Deconvolution Deconvolution is a complex mathematical process that deblurs the
image by modelling the blurring from the point spread function (PSF). If there is
no blurring in the original image, deconvolution will have no effect.
• Erosion Erosion filters remove bright edges around stars, making them both
sharper and smaller.
• Kernel Filters A kernel filter applies a kernel, convolution matrix, or mask to the
image. This is basically a matrix. The matrix is moved over the image, which is
multiplied by the values with the matrix. The effect of the kernel filter is dependent
on the contents of the matrix. It may blur, sharpen emboss, or enhance edges,
depending on its parameters.
• FFT Filters A fast Fourier filter applies a Fourier transform to the image (recall
that an image can be treated as a series of waves). FFT filters are used to reduce
patterning on an image such as stripping.
• Digital Development Filters Digital development filters are a series of mathematical filters designed to make CCD images have a film-like response, i.e., nonlinear.
They bring out faint detail and reduce bright sources.