Table 3.

Quantization results derived from the user experiment with the image size $50\times 50$ mm.

Visual Variable	Geometric Amplitude	Geometric Frequency	Colour Amplitude	Colour Frequency
Quant. step $\mathrm{\Delta }v$ (adu)	≈2.91	≈2.01	≈1.23	≈1.14
# levels (50 mm)	4	5	4	4