Table 6.
Comparison of color temperature measurement and calculation results.
| Color Temperature (K) | Short-Wavelength Ratio (%) | |||||||
|---|---|---|---|---|---|---|---|---|
| Date | Time | (a) Standard EquipmentCAS 140CT | (Existing Method) RGB-Sensor-Based Measuring Device |
(e) (Proposed Method) Short -Wavelength Ratio-Based Calculation | Standard EquipmentCAS 140CT | Proposed Method | ||
| (b) Experimental Test Result (before Calibration) | (c) Color Temperature Calibration | (d) Chromaticity Coordinate-Based Calibration | ||||||
| 20.04.04 | 7:12 | 4681.87 | 6239.528 | 4265.26 | 3835.808 | 4807.789 | 16.64 | 16.85 |
| 20.04.04 | 7:13 | 4588.73 | 5815.352 | 4118.533 | 3773.164 | 4540.031 | 16.14 | 15.06 |
| 20.04.04 | 7:14 | 4518.28 | 5770.384 | 3953.319 | 3414.759 | 4501.389 | 15.76 | 14.80 |
| 20.04.04 | 7:15 | 4490.18 | 5910.468 | 3993.026 | 3649.885 | 4595.391 | 15.61 | 15.43 |
| 20.04.05 | 9:30 | 5388.59 | 7266.202 | 5376.623 | 5375.491 | 5402.430 | 21.70 | 20.82 |
| 20.04.05 | 9:31 | 5397.74 | 7328.484 | 5410.156 | 5408.558 | 5428.375 | 21.75 | 20.99 |
| 20.04.05 | 9:32 | 5410.07 | 7275.929 | 5381.86 | 5380.783 | 5406.809 | 21.82 | 20.85 |
| 20.04.05 | 9:33 | 5415.24 | 7275.929 | 5381.86 | 5380.783 | 5406.809 | 21.86 | 20.85 |
| 20.04.07 | 12:00 | 5459.03 | 7406.134 | 5451.963 | 5451.212 | 5463.187 | 22.52 | 21.23 |
| 20.04.07 | 12:01 | 5464.97 | 7442.926 | 5471.771 | 5472.471 | 5481.808 | 22.55 | 21.35 |
| 20.04.07 | 12:02 | 5470.72 | 7438.425 | 5469.348 | 5470.011 | 5479.863 | 22.58 | 21.34 |
| 20.04.07 | 12:03 | 5471.18 | 7429.341 | 5464.457 | 5465.046 | 5475.929 | 22.59 | 21.31 |
| 20.04.08 | 14:30 | 5628.06 | 7697.476 | 5608.821 | 5624.914 | 5619.363 | 23.26 | 22.27 |
| 20.04.08 | 14:31 | 5627.67 | 7798.847 | 5663.399 | 5681.245 | 5661.600 | 23.26 | 22.55 |
| 20.04.08 | 14:32 | 5626.42 | 7795.272 | 5661.474 | 5679.316 | 5660.274 | 23.25 | 22.54 |
| 20.04.08 | 14:33 | 5623.91 | 7726.041 | 5624.201 | 5641.772 | 5633.810 | 23.23 | 22.37 |
| 20.04.09 | 15:00 | 5427.2 | 7325.481 | 5408.539 | 5412.959 | 5440.796 | 22.09 | 21.08 |
| 20.04.09 | 15:01 | 5467.1 | 7386.821 | 5441.564 | 5448.513 | 5472.803 | 22.31 | 21.29 |
| 20.04.09 | 15:02 | 5506.61 | 7364.482 | 5429.537 | 5436.442 | 5463.224 | 22.50 | 21.23 |
| 20.04.09 | 15:03 | 5526.2 | 7423.004 | 5461.046 | 5468.895 | 5490.104 | 22.63 | 21.41 |
| 20.04.24 | 18:08 | 4171.02 | 5253.462 | 4292.964 | 4274.232 | 4151.222 | 13.12 | 12.47 |
| 20.04.24 | 18:09 | 4150.36 | 5345.677 | 4342.612 | 4321.42 | 4220.916 | 12.98 | 12.93 |
| 20.04.24 | 18:10 | 4122.84 | 5421.814 | 4383.605 | 4359.967 | 4276.069 | 12.82 | 13.30 |
| 20.04.24 | 18:11 | 4102.23 | 5345.801 | 4342.679 | 4319.52 | 4218.038 | 12.68 | 12.91 |
| Average error rate (%) |
34.06% | 1.112% | 1.138% | 0.903% | - | 5.31% | ||
| Standard deviation on error rate (%) | 4.73% | 1.78% | 1.77% | 1.62% | - | 3.09% | ||