Scanning converter

Abstract

Abstract PURPOSE:To obtain a picture of a sequential scanning system where the number of scanning lines is doubled by synthesizing signals of two adjacent fields in the interface scanning system and outputting repetitively the same field signals to the seqential scanning system. CONSTITUTION:A storage device 2 has an address for N-line's share, where N is the minimum integer larger than the ratio of the vertical scanning period of an input video signal (g) to the horizontal scanning period. A discriminator 8 discriminates whether the video signal (g) is based on the interlace scanning system or the sequential scanning system on the basis of a vertical synchronizing signal (k) or a horizontal synchronizing signal (l), and an address generator is set to the 1st or 2nd mode accordingly. In the 1st mode, the storage device 2 reads one line's share of the preceding field at the 1/2H period of the first half of the said line during the write of one line of the present field and reads one line's share of the present field at the latter 1/2H period. In the 2nd mode, the storage device 2 reads one line's share just before at the first 1/2H period of the said line during the write of one line's share of the present field and reads one line's share of the present field at the latter 1/2H period.

Inventors

• 👤 Takeshi Arai
• 👤 武 新井
• 👤 Masami Ebara
• 👤 江原　正己
• 👤 Hiroyuki Ueyama
• 👤 植山　浩行

Bibliographic Details