Patent ID: 11861897
Assignee: JIANGSU UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 14:
15. A detection method using the portable apparatus for detecting early crop diseases according to claim 3, comprising the following steps:
rotating the opening-and-closing skeleton, opening the light-shielding cloth, and putting a crop sample to be detected into the dark box body from a bottom;
adjusting a shooting distance of the crop sample to a suitable distance through an observation port;
closing the opening-and-closing apparatus, selecting a suitable projection optical wavelength, controlling the spatial frequency domain imaging apparatus to project structured light of sine grey scale patterns with different spatial frequencies to the crop sample to be detected; after the sine gray scale pattern is switched each time, acquiring, by the camera, a diffuse reflection image of a surface of the crop sample once; and opening all the opening-and-closing apparatuses, replacing the crop sample with a reference whiteboard, and repeating the foregoing operations;
performing uniformity correction on the diffuse reflection image, demodulating the image, and extracting an alternating current component; and
inputting the alternating current component image to a trained disease detection model, and determining whether the crop sample has a disease.