update README with input data info

Author: mgrabban

sobel_filter/README.md

@@ -5,8 +5,8 @@ This workload implements the widely used sobel filter edge detection algorithim
 algorithm in computer vision and image based machine learning domain, including autonomous driving.
 
 ## Downlod and extract data:
-sobel_filter (now) has a large image input which can be downloaded from [here](unavailable - we are working on providing the link).
-After download, extract and copy image silverfalls_32Kx32K.png into the res folder. In can also be copied to some other location in which case the -i flag when running the workload needs to be updated. Note because of the large input image, an ENV variable OPENCV_IO_MAX_IMAGE_PIXELS='1677721600' needs to be in PATH when running the workload. Run instructions below have been udpated for this. Because of the use of large input image, scaling it up (e.g. -f 16) is not needed anymore.
+sobel_filter has a large image input inside sobel_filter/res folder in .tgz format. Extract the .tgz file and make sure silverfalls_32Kx32K.png is inside the res folder. It can also be copied to some other location in which case the -i flag when running the workload needs to be updated to point to it.  
+Note because of the large input image, an ENV variable OPENCV_IO_MAX_IMAGE_PIXELS='1677721600' needs to be in PATH when running the workload. Run instructions below have been udpated for this. Because of the use of large input image, scaling it up (e.g. -f 16) is not needed anymore.
 # Build Instructions
 
 ## To build for SYCL