SIFT_create1
import { SIFT_create1 } from '@banou/opencv-wasm'Use after await initOpenCV(). See the initialization and named imports guide.
Create SIFT with specified descriptorType.
Note: The contrast threshold will be divided by nOctaveLayers when the filtering is applied. When nOctaveLayers is set to default and if you want to use the value used in D. Lowe paper, 0.03, set this argument to 0.09.
SIFT_create1(nfeatures: number, nOctaveLayers: number, contrastThreshold: number, edgeThreshold: number, sigma: number, descriptorType: number, enable_precise_upscale: boolean): SIFT | null;2 available overloads
SIFT_create1(nfeatures: number, nOctaveLayers: number, contrastThreshold: number, edgeThreshold: number, sigma: number, enable_precise_upscale: number): SIFT | null;SIFT_create1(nfeatures: number, nOctaveLayers: number, contrastThreshold: number, edgeThreshold: number, sigma: number, descriptorType: number, enable_precise_upscale: boolean): SIFT | null;nfeaturesThe number of best features to retain. The features are ranked by their scores (measured in SIFT algorithm as the local contrast)
nOctaveLayersThe number of layers in each octave. 3 is the value used in D. Lowe paper. The number of octaves is computed automatically from the image resolution.
contrastThresholdThe contrast threshold used to filter out weak features in semi-uniform (low-contrast) regions. The larger the threshold, the less features are produced by the detector.
edgeThresholdThe threshold used to filter out edge-like features. Note that the its meaning is different from the contrastThreshold, i.e. the larger the edgeThreshold, the less features are filtered out (more features are retained).
sigmaThe sigma of the Gaussian applied to the input image at the octave #0. If your image is captured with a weak camera with soft lenses, you might want to reduce the number.
enable_precise_upscaleWhether to enable precise upscaling in the scale pyramid, which maps index
\texttt{x}to\texttt{2x}. This prevents localization bias. The option is disabled by default.descriptorTypeThe type of descriptors. Only CV_32F and CV_8U are supported.
The SIFT | null result.
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