Add the GHS-DPP dataset

ghsdpp-dataset/README.md

@@ -0,0 +1,35 @@
+# GHS-DPP dataset (av1 compressed)
+
+This dataset contains the GHS-DPP recordings
+of \emph{Drosophila} wild-type and \emph{spam} and 
+honeybee compound eyes.
+It shows how the rhabdomeres (or rhabdoms in honeybees) move
+during the photoreceptor microsaccades, which are caused by
+photomechanically contracting microvilli.
+
+The original dataset consists of uncompressed 16-bit grayscale tiff images.
+To make it more accessible, we have used the [AOMedia Video 1 (AV1)](https://en.wikipedia.org/wiki/AV1)
+video compression algorithm (150 G -> 1.5 G).
+
+## Details
+
+Experimental details are presented in [the paper preprint](https://www.biorxiv.org/content/10.1101/2021.07.22.453335v2).
+Shortly, the high-speed camera starts to acquire
+images at 100 Hz, and simultaneously to this the stimulus UV LED turns on for 200 ms.
+Then, the imaging is repeated in ~200 other eye locations (fullscans) or
+repeated in the same location in total 25 times (manyrepeats).
+
+For \emph{Drosophila} data
+
+- time between frames: 10 ms
+- pixel size: 0.817 µm/pixel
+
+
+## Notes
+
+Gonio Analysis v0.6.0 cannot yet directly work with av1 videos.
+Temporary workaround is to convert the videos into tiff stacks.
+
+Similarly, other software (ImageJ/Fiji) may require conversion to
+other formats.
+