在此基础上，引入二维FFT技术，对半色调误差图象的质量进行了分析研究。
On the basis of which the two dimentional FFT technology is introduced to analyse the quality of error between the halftone image and the original image.
由S-cone引起的色觉误差会导致颜色的接收都是基于红、绿色调，而深受赞誉的蓝、黄配色则无法感知。
Color deficiencies based on S-cones have the effect that color perception is based on red and green hues, the perception of the complimentary color pair blue and yellow is disturbed.
计算了喷墨绘图仪喷头的实际灰度，并基于这个实际灰度，改进了误差扩散方法和半色调技术。
On the basis of calculated actual grey, a modified error diffusion and halftone technique are researched.
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