microwave power splitter is a system that makes it easier for high frequencies to pass but prevents low frequencies from doing so. It removes unnecessary low-frequency components or low-frequency interference from the signal. Its characteristics can be described by impulse response and frequency response in time domain and frequency domain respectively. The latter is expressed as a function with frequency as its independent variable. Generally, the complex function with complex variable jω as the independent variable is expressed by H(jω). Its modulus H(ω) and amplitude Angle φ(ω) are functions of angular frequency ω, respectively called the "amplitude-frequency response" and "phase-frequency response" of the system, representing the amplitude and phase changes encountered by signal components of different frequencies in the excitation source through the system. It can be shown that the frequency response of the system is the Fourier transform of the impulse response of the system. When a linear passive system can be expressed as a linear differential equation of order N, the frequency response H(jω) is a rational fraction whose numerator and denominator correspond to the left and right sides of the differential equation, respectively.
microwave power splitter attenuates low frequency signals and lets high frequency signals through, which enhances sharp detail in the image but decreases image contrast. High frequency signals correspond to grayscale components in the image that change more and more rapidly, caused by sharp grayscale transitions. Firstly, Fourier transform is applied to the image to obtain its frequency domain image. Then, the low-frequency component is treated as 0 in frequency domain to realize high-pass filtering. Finally, the inverse Fourier transform of the image is carried out to obtain the original image after restoration.
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