English: Demonstration of interlace and so-called "interline twitter", based on part of an RCA Indian Head Test Card ca. 1940. From left to right: progressive, interlace animation, and reconstructed using "bob" (interpolation per field) algorithm. Top row: original full-resolution image; bottom row: vertically blurred using [1 4 6 4 1]/16 kernel. Progressive images are darkened somewhat to match the effective brightness of the interlaced images.
Això és una imatge retocada, cosa que vol dir que ha estat alterada digitalment de la seva versió original. Modificacions: Interlaced, animated, retouched, and blurred. L'original es pot veure a: RCA Indian Head test pattern.JPG: . Modificacions fetes per Damian Yerrick.
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{{Information |Description={{en|Demonstration of interlace and so-called "interline twitter", based on part of an RCA Indian Head Test Card ca. 1940. From left to right: progressive, interlace animation, and reconstructed using "bob" (interpolation per fi