Sony Group Corporation
IMAGE PROCESSING DEVICE, IMAGE PROCESSING METHOD, AND PROGRAM

Abstract:

Calculation of NDVI values with reduced errors caused by variations of sun-light reflection-vs-incidence angles is disclosed. One example of a device includes a data processor that retrieves an image captured by a camera and analyzes the retrieved image to calculate NDVI values indicating activity levels of a plant. The data processor selects plural sampling points from among constituent pixels of the retrieved image, calculates a sampling-point two-dimensional distribution approximation model formula that approximates a two-dimensional distribution of NDVI values and sun-light reflection-vs-incidence angles at the selected sampling points, generates, on the basis of the calculated sampling-point two-dimensional distribution approximation model formula, a corrected NDVI value calculation formula for calculating corrected NDVI values obtained by reducing variations of the NDVI values caused by variations of the sun-light reflection-vs-incidence angles, and calculates the corrected NDVI values according to the generated corrected NDVI value calculation formula.