Remote Sensing
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چکیده
If a vertical or horizontal section is taken across a digital image and the image values are plotted against distance, a complex curve is produced. An examination of this curve would show sections where the gradients are low (corresponding to smooth tonal variations on the image) and sections where the gradients are high (locations where the digital numbers change by large amounts over short distances). Filtering is the process by which the tonal variations in an image, in selected ranges or frequencies of the pixel values, are enhanced or suppressed. Or in other words, filtering is the process that selectively enhances or suppresses particular wavelengths or pixel DN values within an image.
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