目前，图像质量评价研究的主要困难是主观质量评价和客观质量评价之间存在偏差。

There is some difference between the subjective quality assessing and objective quality assessing which lower the quality assessing model's performance.

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为了更进一步的研究适用于医学图像的客观质量评价方法，我们建立了一套用于质量评价的医学图像库。

To study further the better suitable objective medical image quality assessment, we construct the medical image database used to evaluate the performance of new objective image assessment methods.

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为了评价融合影像质量和各种融合方法的优缺点，理论上必须具备一套客观的、全面的评价指标。

In order to evaluate the quality of fused image, the merit and defect of every fusion method, there must be a set of objective and overall evaluation indexes in theory.

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