add CCD width descriptions

README.md

@@ -38,3 +38,54 @@ Example data can be found at https://github.com/OpenDroneMap/odm_data
 ---
 
 Long term, the aim is for the toolchain to also be able to optionally push to a variety of online data repositories, pushing hi-resolution aerials to [OpenAerialMap](http://opentopography.org/), point clouds to [OpenTopography](http://opentopography.org/), and pushing digital elevation models to an emerging global repository (yet to be named...). That leaves only digital surface model meshes and UV textured meshes with no global repository home.
+
+---
+
+Troubleshooting:
+
+If you run ODM with your own camera, it is possible you will see something like this:
+
+```
+  - configuration:
+    --cmvs-maxImages: 100
+    --end-with: pmvs
+    --match-size: 200
+    --matcher-ratio: 0.6
+    --matcher-threshold: 2
+    --pmvs-csize: 2
+    --pmvs-level: 1
+    --pmvs-minImageNum: 3
+    --pmvs-threshold: 0.7
+    --pmvs-wsize: 7
+    --resize-to: 1200
+    --start-with: resize
+
+
+  - source files - Fri Sep 19 13:47:42 UTC 2014
+
+
+    no CCD width or focal length found for DSC05391.JPG - camera: "SONY DSC-HX5V"
+    no CCD width or focal length found for DSC05392.JPG - camera: "SONY DSC-HX5V"
+    no CCD width or focal length found for DSC05393.JPG - camera: "SONY DSC-HX5V"
+    no CCD width or focal length found for DSC05394.JPG - camera: "SONY DSC-HX5V"
+    no CCD width or focal length found for DSC05395.JPG - camera: "SONY DSC-HX5V"
+    no CCD width or focal length found for DSC05396.JPG - camera: "SONY DSC-HX5V"
+    no CCD width or focal length found for DSC05397.JPG - camera: "SONY DSC-HX5V"
+    no CCD width or focal length found for DSC05398.JPG - camera: "SONY DSC-HX5V"
+    no CCD width or focal length found for DSC05399.JPG - camera: "SONY DSC-HX5V"
+
+    found no usable images - quitting
+Died at ../../OpenDroneMap/./run.pl line 364.
+
+
+```
+
+This means that your camera is not in the database, https://raw.githubusercontent.com/OpenDroneMap/OpenDroneMap/gh-pages/ccd_defs.pl
+
+This problem is easily remedied. We need to know CCD size in the camera. We'll get these for our Sony Cyber-shot DSC-HX5 from dpreview: http://www.dpreview.com/products/sony/compacts/sony_dschx5/specifications
+
+So, we'll add the following line to our ccd_defs.pl:
+
+     "SONY DSC-HX5V"                            => 6.104,  # 1/2.4"
+     
+And so others can use it, we'll do a pull request to add it to our array for everyone else.