Generalize and rename the article

Interpolation.md

@@ -1,13 +1,11 @@
-Smoothmotion
-============
+Interpolation techniques
+========================
 
-Many people have come to misunderstand the functionality and purpose of
-smoothmotion, going as far as confusing it with motion interpolation (such as
-found in SVP or MVTools).
+This article will cover a few of the standard techniques for temporal video frame interpolation, outlining in particular the difference between techniques like SVP/MVtools (also known as motion-based interpolation) and algorithms like smoothmotion.
 
 <img align="right" src="smoothmotion-original.png" />
 
-To demonstrate the difference, we will look at what happens when trying to
+To demonstrate the differences, we will look at what happens when trying to
 display a 24 Hz video file on 60 Hz monitor. This is the source file I will be
 using. For illustration, each video frame will appear as one horizontal line of
 the image. (So the vertical axis is the time axis)
@@ -32,14 +30,16 @@ that the first frame will be shown 3 times, the second frame 2 times, the third
 As can be clearly seen, the inconsistent width results in a jagged appearance,
 which is a visualization of the phenomenon known as judder.
 
-Motion interpolation
-====================
+This technique is essentially like nearest neighbour upscaling - each frame simply picks the source frame that's closest to it in the original video source (rounded down).
+
+Motion-based interpolation
+==========================
 
 <img align="right" src="smoothmotion-interpolated.png" />
 
-True motion interpolation algorithms like SVP, MVTools or the chips built into
+Motion-based interpolation algorithms like SVP, MVTools or the chips built into
 various TV devices employ complex algorithms to try and recognize movement in
-the video, and fill in the missing gaps as needed.
+the video (motion vectors), and fill in the missing gaps as needed.
 
 This drastically alters the result - it's now one continuous motion, similar
 to a true 60 Hz clip. However, this comes at a cost - not only are the
@@ -55,6 +55,8 @@ uses, which is usually shot at 24 Hz. Many people therefore subconsciously
 associate the visual appearance of 60 Hz content with soap operas, and thus
 think it looks worse.
 
+This is essentially similar to "smart" upscaling filters, eg. NEDI or NNEDI3 - which are also expensive to compute and produce results that drastically alter the source image.
+
 Smoothmotion
 ============