Rice leaf nitrogen content detection method and system thereof using rice leaf images

A rice leaf nitrogen content detection method includes: operating an image-capturing unit to capture a rice leaf image data from a rice leaf; retrieving a plurality of color pixel data from the rice leaf image data, with the color pixel data including a plurality of pixel value data; correcting the plurality of color pixel data with a conversion correction tool to obtain a plurality of corrected color pixel data; correspondingly converting the pixel value data of corrected color pixel data into a nitrogen-contained measurement data to build a corrected-data mathematical digital model; calculating an unknown rice leaf image data in the corrected-data mathematical digital model to obtain an estimated nitrogen-contained data.