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Soil map is a geographical representation showing diversity of soil types and/or soil properties (soil pH, textures, organic matter, depths of horizons etc.) in the area of interest. It is typically the end result of a soil survey inventory, i.e. soil survey. Soil maps are most commonly used for land evaluation, spatial planning, agricultural extension, environmental protection and similar projects. Traditional soil maps typically show only general distribution of soils, accompanied by the soil survey report. Many new soil maps are derived using digital soil mapping techniques. Such maps are typically richer in context and show higher spatial detail than traditional soil maps. Soil maps produced using (geo)statistical techniques also include an estimate of the model uncertainty.
Brightness controllable soil image enhancement method based on sigmoid curve fitting
ActiveCN116433510BImage enhancementInternal combustion piston enginesComputer graphics (images)Rgb image
The application discloses a luminance-controllable soil image enhancement method based on Sigmoid curve fitting, which comprises the following steps: S1, using Sigmoid to fit the cumulative probability density of a soil image Y component to obtain a Sigmoid fitting curve of the cumulative probability density; S2, performing luminance migration processing on the Sigmoid fitting curve to obtain a luminance-migrated Sigmoid fitting curve cdf tar ; S3, performing luminance sorting and migration processing on the soil image Y component according to the fitting curve cdf tar ; S4, correcting soil image U and V components to obtain corrected color components; S5, fusing the processed Y component and the corrected color components and converting back to an RGB color space to obtain an enhanced RGB image. The application can controllably enhance the luminance of a soil image, and has high enhancement precision and small distortion.
Owner:CHONGQING NORMAL UNIVERSITY +2