| CPC G06K 15/1878 (2013.01) [G06K 15/102 (2013.01); G06K 15/1881 (2013.01); G06T 7/0004 (2013.01); G06T 7/90 (2017.01); G06T 2207/30144 (2013.01)] | 8 Claims |
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1. An image processing apparatus comprising:
an input unit configured to input a plurality of multi-valued data corresponding to a plurality of color materials; and
a quantization unit configured to quantize each of the plurality of multi-valued data and generate a plurality of quantization data each indicating recording or non-recording of a dot on a recording medium by each of the plurality of color materials,
wherein a plurality of dot patterns of the plurality of color materials recorded based on the plurality of quantization data generated by the quantization unit have peaks at different deviation angles in power spectra in a frequency domain and have a blue noise characteristic or a green noise characteristic, and
wherein
in a case where, in polar coordinates F(r, θ) of the power spectrum in the frequency domain of each of the plurality of dot patterns, an average of powers at a frequency r is represented by a radially averaged power spectrum RAPS(r) for each frequency and an average of powers at a deviation angle θ falling within a range of 0° to 180° is represented by a frequency averaged power spectrum FAPS(θ) for each angle,
RAPS(r) of each of the plurality of dot patterns has the blue noise characteristic or the green noise characteristic, and has a peak in a band corresponding to the peak at the deviation angle, and FAPS(θ) of each of the plurality of dot patterns has the blue noise characteristic or the green noise characteristic, and has a peak at the deviation angle.
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