Hd video camera
High-definition video is video of higher resolution than is standard. While there is no specific meaning for high-definition, generally any video image with more than 480 horizontal lines (North America) or 570 lines (Europe) is considered high-definition. 720 scan lines is generally the minimum even though many systems greatly exceed that. Images of standard resolution captured at rates faster than normal (60 frames/second North America, 50 fps Europe), by a high-speed camera may be considered high-definition in some contexts. Additionally, non-interlaced video (also called progressive scan) is sometimes considered high resolution, even at standard resolution and frame rates.From a historical perspective, the first electronic scanning format 405 lines was the first "high definition" television system as the previous mechanical systems had far fewer scanning lines.
From 1939, the US and other European countries experimented with 441 lines and 605 lines until, in 1941, the Federal Communications Commission (FCC) mandated 525 lines for the US. In wartime France, René Barthélemy experimented with higher definitions, reaching 1015 and even 1042 lines. Official French transmissions finally began with 819 lines in late 1949; however, this standard was abandoned in 1984 upon the adoption of 625-line color on the TF1 network.