An engineering notebook on AI, systems, and everyday experiments.

DigitalOcean server incidents and migration to Azure—site layout may be temporarily affected during the transition.

入门胶片摄影的体验分享，介绍不同画幅（135/120/6x6/4x5）、取景对焦方式、冲洗扫描流程，以及胶片画质相比数码的优势与坑点。

镜头色差详解：轴向色差与焦距成正比所以长焦需要APO设计，径向色差与焦距无关无法用APO解决。光圈越大色差越明显，小光圈可减轻轴向色差。

Practical guide to photographing a total solar eclipse, covering time-lapse techniques, bracket exposure for corona details, and economical alternatives using telescopes instead of expensive telephoto lenses.

A hands-on comparison of Hasselblad X1D medium format vs full frame cameras: image quality advantages exist, but speed and usability issues make full frame more practical for most users.

Connecting photography concepts with optics: glasses diopter equals 1/focal length, aperture affects depth of field and diffraction, and macro lens design for close focusing.

Creating gigapixel panoramas with Leica SL and vintage R lenses: from Seattle skyline to macro photography of watches and dollar bills, with tips for successful stitching.

基于Caffe的斗图机器人：用深度学习提取表情特征，在数据库中找最近邻实现自动回复，效果意外地好但也暴露了ImageNet预训练模型在二次元表情上的局限。

微信机器人功能升级：群标签云统计、个人发言分析、活跃度可视化，并接入ElasticSearch和Kibana实现实时监控，算法从TF升级到TF-IDF。

探讨聊天机器人的核心价值：利用聊天记录做跨群转发、主题归并、脉络梳理和统计分析，让碎片化信息变得有组织，提供比单纯推送更独特的价值。