Restoring Baird's Image - IET Digital Library

Contents vii
Vision by Electricity 94
Television Synchronisation 97
30-line Vision Synchronisation 100
What do we do without Timing? 101
Early Attempts at Viewing the Recordings 102
Principles behind the Restoration Process 103
Phase 1 - Capture 104
Pick-up Cartridge 106
Centring the Disc 107
Digitisation 107
Phase 2 - Restoration 108
Signal Processing 109
Image Processing 112
It's all a Question of Timing 113
Pattern Matching 114
Pattern Matching Methods 115
Phase and Frequency 117
Fourier Analysis 118
Correcting for Disc Surface Faults 120
Early Videodisc Defects 121
Filtering 123
Small Defect Detection 124
Alternative Approaches 125
Phase 3 - Displaying the results 125
Vision restored 127
6 Discoveries 129
Phonovision: Genuine or Fake? 129
The Columbia Graphophone Company 131
Dating 'Miss Pounsford' 132
Why are these Discs Phonovision? 133
Valid Recording Dates? 134
Baird's Recording Studio? 134
The Studio in 3D 138
When were the Photographs taken? 140
When were the Photographs taken? 141
When were the Photographs taken? 142
'Phoney' Phonovisor 142
Radial Tracking 144
Pick-up Type 146
The Bar reveals all 146
Timing Faults 147
'Stookie Bill' 149
Image Shape 150
Aspect Ratio 153
Faults in Building the Nipkow Disc 153