The technique of wavelet transform has been applied and studied in the image coding field extensively because of its good feature of time-frequency and human visual system.
小波变换技术以其良好的空间—频率局部特性和与人眼视觉特性相符的变换机制，在图像编码领域得到了广泛的应用和研究。
And, particularly, the adoption of the frequency-converting technique has remarkably improved the screen image quality of the traditional simulated color TVs.
特别是利用变频技术显著改善了传统模拟彩电的画质。
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