Lee Yeejin, Hirakawa Keigo
IEEE Trans Image Process. 2022;31:3309-3321. doi: 10.1109/TIP.2022.3169687. Epub 2022 May 4.
Color filter array is a spatial multiplexing of pixel-sized filters fabricated over pixel sensors in most color image sensors. The state-of-the-art lossless coding techniques of raw sensor data captured by such sensors leverage spatial or cross-color correlation using lifting schemes. In this paper, we propose a lifting-based lossless white balance algorithm. When applied to the raw sensor data, the spatial bandwidth of the implied chrominance signals decreases. We propose to use this white balance as a pre-processing step to lossless CFA subsampled image/video compression, improving the overall coding efficiency of the raw sensor data.
彩色滤光片阵列是大多数彩色图像传感器中在像素传感器上制造的像素大小滤光片的空间复用。此类传感器捕获的原始传感器数据的最新无损编码技术利用提升方案利用空间或跨颜色相关性。在本文中，我们提出了一种基于提升的无损白平衡算法。当应用于原始传感器数据时，隐含色度信号的空间带宽会降低。我们建议将此白平衡用作无损CFA下采样图像/视频压缩的预处理步骤，提高原始传感器数据的整体编码效率。
