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Table 2 Correlation between the mean parameters and their combinations for tobacco leaves and the blade SPAD values

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

  RMean GMean BMean RMean + GMean + BMean RMean/RMean + GMean + BMean GMean/RMean + GMean + BMean BMean/RMean + GMean + BMean
Pearson correlation − 0.763** − 0.711** − 0.402** − 0.737** − 0.723** 0.675** 0.150*
  RMean − GMean RMean − BMean GMean − BMean RMean + GMean RMean + BMean GMean + BMean  
Pearson correlation − 0.750** − 0.743** − 0.545** − 0.755** − 0.735** − 0.650**  
  1. The mean parameters of the red, green, and blue color channels as well as the gray-level images were obtained using 50 pieces of fully expanded tobacco leaves at 40, 50, 60 and 65 days, respectively. The SPAD values also come from 50 leaves at each leaf age. Each leaf blade was measured at the same five points mentioned in Table 2
  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)