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Table 3 Correlation between the skewed-distribution parameters and the blade SPAD values of the tobacco leaves

From: Skewed distribution of leaf color RGB model and application of skewed parameters in leaf color description model

  RMean RMedian RMode RSkewness RKurtosis GMean GMedian GMode RSkewness RKurtosis
Pearson correlation − 0.763** − 0.728** − 0.592** − 0.458** − 0.007** 0.711** 0.637** − 0.480** 0.312** − 0.109
  BMean BMedian BMode BSkewness BKurtosis YMean YMedian YMode YSkewness YKurtosis
Pearson Correlation − 0.402** − 0.337** − 0.341** − 0.268** − 0.300** − 0.744** − 0.680** − 0.526** 0.339** − 0.078
  1. The 20 parameters with the red, green, and blue color channels as well as the gray-level images were obtained with MATLAB using 50 pieces of fully expanded tobacco leaves at 40, 50, 60 and 65 days, respectively
  2. ** Indicates significant correlation according to a two-tailed test (p < 0.01)
  3. * Indicates significant correlation according to a two-tailed test (p < 0.05)