576 is the number of lines for Standard Definition Television(SDTV) in Europe. It is the number of visible lines. The total line count of 625 lines is derived from the visible lines and the vertical blanking interval of 49 lines, 24 of which are in the first field and 25 in the second. The 576 standard has 720 visible pixels per line, and 864 pixels with horizontal blanking.
The line number 576 is often indicated with the addition of "i", "p" or psF as 576i, 576p or 576psF.
576p stands for progressivescan, the progressive scanning of the image display. With this display technique, the image builds up continuously from top to bottom. Progressive scan knows only one full frame and, in contrast to interlaced scanning, also has only one vertical blanking interval.
576psF stands for Progressive Segmented Frame (psF) is another television standard for progressive scan. It works with two vertical blanking intervals. For this purpose, two fields with odd and even lines and two blanking gaps are generated from the full frame of the progressive scan display. The two fields differ from the fields of the interlaced scan in that they do not contain any motion dynamics. They are identical in content. This method is used so that television equipment and television sets designed for interlaced scanning can display the progressive scan signals.