|
|
We have pioneered the ultrahigh-sensitivity HARP* camera tube based on the avalanche multiplication phenomenon, and have built an HDTV handheld camera using this camera tube (maximum multiplication factor: 200) equipped with a 15-ｵm thick photoconductive film. This camera can shoot in dim light, e.g., under moonlight, and it has been deployed in the field. NHK is using it for reporting breaking news at night and in producing natural science programs.
We wanted to take advantage of the outstanding characteristics of the HARP camera tube, such as its ability to capture scenes in detail even under dim lighting conditions and its wide dynamic range so that more natural nighttime scenes could be shot in drama productions. Our latest HDTV HARP camera for nighttime shoots of drama productions does not have the extremely high sensitivity required for nighttime news reporting; instead, it balances sensitivity with picture quality.
|
- A new signal level setup method for the camera tube and video circuit was incorporated in a camera to reduce amplifier noise and lag to half that of the conventional method.
- The new tube has double the photo-conversion efficiency for red light of the conventional model. It has less shot noise, and furthermore, colors, such as the color of skin as it appears at night, look more natural.
- Excellent images with less noise can be obtained even in nighttime scenes.
|
Work will improve the durability of the new extended red camera tube.
This research is being carried out in partnership with Hamamatsu Photonics K.K. and Hitachi Kokusai Electric Inc.
*HARP (High-gain Avalanche Rushing amorphous Photoconductor) |
|
|
