Underwater Image Quality Evaluation Measurement Method Based on Power Spectrum Description
A technology for underwater images and image quality, applied in image analysis, image data processing, instruments, etc., can solve problems such as poor visual subjective consistency, inability to evaluate untargeted underwater images, blurring, etc.
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Embodiment 1
[0080] Embodiment 1, a kind of underwater image quality evaluation measurement method based on power spectrum description, for an underwater image I, set the image quality of I as PSVIQE={C, Q}, wherein, C is to describe the underwater imaging environment Q is the measurement value of the underwater image itself; C is used to distinguish the underwater environment where the underwater image is located. The larger the C, the better the transparency of the water body, which is conducive to clear imaging; the smaller the C, the better the absorption and scattering of the water body. The greater the attenuation; the Q value is to measure the clarity of the underwater image; the larger the Q value, the clearer the image contains the target, and the smaller the Q value, the absence of the target or the blurred image in the underwater image;
[0081] C∈(0,1), the value of C is determined by the following formula (1):
[0082]
[0083] In the formula (1), 0<α<π / 2, α is the inclinat...
Embodiment 2
[0098] Embodiment 2, experiment of underwater image quality evaluation measurement method based on power spectrum description:
[0099] refer to image 3 and 4 The average power spectrum in the log contrast direction of the pool image. In the pool image test, the pool is 4.5 meters long, 2 meters wide, and 2 meters high. Each test uses about 15 tons of water. There are four observation windows on three sides of the pool. The test targets are iron pipes and target boards, among which the target board is a 40em×50cm white board, the stripe spacing on it is 2mm, and the stripe widths are 1mm, 2mm, 3mm, and 4mm in turn.
[0100] The power spectrum amplitude of the low-frequency part of the target image is larger, while the amplitude of the high-frequency part is smaller. In relatively turbid water bodies, due to the absorption and scattering of water, the image contrast is low and blurred. Therefore, the attenuation of the high frequency part in the image spectrum is more ser...
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