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In our previous work, we presented the phase quantization code-based image quality metric (IQM). Amplitude change as well as phase change is an important factor for evaluating image quality. In this paper, we present a new IQM based on the amplitude/phase quantization code (APQC). When an image is degraded by image compression, noise, transmission error, and so on, the amplitude and phase of quadrature outputs change. In other words, degradation of the image quality results in change in the APQC of the image. Experimental results with the LIVE database show the effectiveness of the proposed quality metric.