Incoming energy is transformed into a voltage by the combination of input electrical power and sensor material that is responsive to the particular type or energy being detected. (查看原文)
The quality of a digital image is determined to a large degree by the number of samples and discrete intensity levels used in sampling and quantization. (查看原文)
The section of the real plane spanned by the coordinates of an image is called the spatial domain, with x and y being referred to as spatial variables or spatial coordinates. (查看原文)
f(x, y) is a digital image if (x, y) are integers from z2 and f is a function that assigns an intensity value to each distinct pair of coordinates(x, y). (查看原文)
an image can be smoothed by attenuating the high-frequency components of its Fourier transform. Because edges and other abrupt changes in intensities are associated with high-frequency components, image sharpening can be achieved in the frequency domain by highpass filtering, which attenuates low-frequencies components without disturbing highfrequencies in the Fourier transform. (查看原文)
