caption: a binary representation of the pdd, the beginning
exif: {"Image DocumentName": "First Improvement of PForDelta (NewPFD)", "Image ImageDescription": "\u2022 Using b (e.g., 2) bits to encode 128 numbers \u2026 \u2026 lower 2 bits of 23. higher bits of 23. \u2022 Offset array. \u2022 Exception array. high \u2026 01. low. S9, S16.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}