To understand what "F1" and "cid" (Class ID) imply in a research paper, you must understand the standard evaluation protocols for object detection.
When software like InDesign or online PDF converters export a file, they may assign generic internal names like F1 , F2 , or F3 to the embedded font subsets. cidfont f1
"Microsoft COCO: Common Objects in Context" To understand what "F1" and "cid" (Class ID)
A functional, space-efficient default fallback or embedded CID-keyed font —excellent for technical documents and CJK text, but visually generic for design work. The keyword typically refers to a specific diagnostic
The keyword typically refers to a specific diagnostic metric or parameter found in F1-score evaluation within the context of Object Detection and Instance Segmentation , particularly in large-scale datasets like Open Images .
Here are useful papers and resources to understand the metrics, evaluation methods, and context where this terminology appears.
The Mystery of "CIDFont F1": What It Is and How to Fix It If you’ve ever opened a PDF and been greeted by a cryptic error message saying or if your text has suddenly turned into a series of dots or garbled squares, you’ve encountered one of the most common—and frustrating—quirks of digital typography.