We propose a novel subpixel rendering algorithm for diamond-shaped PenTile displays, which reduces color distortions while improving apparent resolutions. We develop two types of subpixel rendering filters: main filter and color distortion reduction (CDR) filters. To derive the filters, we formulate a quadratic program to minimize the difference between an original input image and a virtual image that the human visual system perceives. By imposing two constraints for filter size and coefficients, we obtain the main filter, which has a suitable size and is normalized. Then, we design the CDR filters based on the analysis of various patch patterns for image areas. We define the patch patterns to classify local areas with possible color distortions. By imposing additional constraints according to the patch patterns, we derive the CDR filters. Lastly, by matching local areas in the input image into the pre-defined patch patterns, we render the image using the main filter and the CDR filters, which are applied adaptively to the local areas. Experimental results demonstrate that the proposed subpixel rendering algorithm improves apparent resolutions and suppresses color distortions effectively, thereby outperforming conventional algorithms.

我们为菱形PenTile显示器提出了一种新颖的亚像素渲染算法，该算法可在提高外观分辨率的同时减少色彩失真。我们开发了两种类型的子像素渲染滤镜：主滤镜和色彩失真减少（CDR）滤镜。为了导出过滤器，我们制定了一个二次程序来最小化原始输入图像和人类视觉系统感知的虚拟图像之间的差异。通过对滤波器大小和系数施加两个约束，我们获得了主滤波器，该主滤波器具有合适的大小并已归一化。然后，我们基于对图像区域的各种补丁图案的分析来设计CDR过滤器。我们定义了补丁图案，以对可能存在颜色失真的局部区域进行分类。通过根据补丁模式施加其他约束，我们可以得出CDR过滤器。最后，通过将输入图像中的局部区域匹配到预定义的补丁图案，我们使用主滤镜和CDR滤镜渲染图像，这些滤镜会自适应地应用于局部区域。实验结果表明，所提出的亚像素渲染算法提高了视在分辨率，并有效地抑制了色彩失真，从而优于传统算法。