Quality Evaluation of Cut Roses by Stem's Curvature (Part 3)

Stem Detection by Relaxation Method and Robust Parameter Estimator to Outlier

Abstract

A rose's stem was extracted using xy chromaticity, which was converted from XYZ color system. The 2D stem shape was measured by SNAKES, which was one of relaxation methods. SNAKES could detect the stem's outline precisely even if the image might contain some noises. The measurement error of the 2D and 3D stem shape was lower than some old methods reported in the previous papers. The Least Median of Squares method was more robust to the outliers than Least Mean Squares method to estimate the parameters of the stem's rotary motion.