In modern smartphone cameras, the Image Signal Processor (ISP) is the core element that converts the RAW readings from the sensor into perceptually pleasant RGB images for the end users. The ISP is typically proprietary and handcrafted and consists of several blocks such as white balance, color correction, and tone mapping. Deep learning-based ISPs aim to transform RAW images into DSLR-like RGB images using deep neural networks. However, most learned ISPs are trained using patches (small regions) due to computational limitations. Such methods lack global context, which limits their efficacy on full-resolution images and harms their ability to capture global properties such as color constancy or illumination. First, we propose a novel module that can be integrated into any neural ISP to capture the global context information from the full RAW images. Second, we propose an efficient and simple neural ISP that utilizes our proposed module. Our model achieves state-of-the-art results on different benchmarks using diverse and real smartphone images.

现代智能手机相机中，图像信号处理器（ISP）是将传感器的原始读数转换为用户可感知的RGB图像的核心元素。我们提出了一个可以捕捉全局上下文信息的模块，并利用该模块构建了一个高效且简单的神经ISP，实现了对不同基准测试集的全分辨率真实智能手机图像的最新成果。

基于全局上下文引导的简单图像信号处理