Image rotation is a common digital image processing technology which is widely applied in various fields. In image system, DDR2 is always used as the display memory. Image display system scans to refresh images usually from left to right and from top to bot-tom,then saving image data in the same order,but for image rotation display of maximum resolution,this general storage method can’ t meet the requirement of DDR2 bandwidth for system. In order to solve this problem,the high-effective storage method must be used. On the basis of the principle of image rotation display,contrasting the general storage method,the block storage method and efficiency of it is discussed. At last,FPGA verification is made in combination of project. The result indicates this block storage method increases bandwidth utilization of DDR2,which can meet the requirement of rotation display,and solves the problem which general storage method can’t meet maximum resolution image rotation display.%图像旋转是一种常用的数字图像处理技术，目前已广泛应用于各领域。在图像系统中，通常采用DDR2作为系统的显示缓存。图像显示系统通常采取从左向右、从上到下的扫描刷新方式，图像数据也以同样的方式进行存储，而这种图像数据的常规存储方法在大分辨率图像旋转显示时难以满足系统对DDR2的带宽需求。为解决这一问题，图像数据必须采用高效的存储方法。以图像旋转显示原理为依据，对比常规存储方法，重点阐述了分块存储方法及其效率，最后结合项目进行了FPGA原型验证。验证结果表明，分块存储方法提高了DDR2的带宽利用率，能够高效满足系统的旋转显示需求，解决了常规存储方法难以满足大分辨率图像旋转显示的问题。
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