works now

Dockerfile

@@ -9,6 +9,10 @@ ENV PATH="$PATH:/root/julia-1.8.5/bin"
 # Uncomment to install shotwell, an image utility. Not required.
 #RUN apt-get update && apt-get install shotwell --no-install-recommends -y
 
-RUN julia -e "using Pkg; Pkg.instantiate()"
+# RUN julia -e "using Pkg; Pkg.instantiate()"
+
+RUN apt-get update && apt-get install vim -y
+
+RUN julia -e "using Pkg; Pkg.add(\"PythonCall\")"
 
 CMD "/bin/bash"

README.md

@@ -22,16 +22,26 @@ cd /root/src
 
 You are now ready to execute code!
 
-## Julia Setup
 
-From inside the docker container
+## Running the example
+```
+LD_PRELOAD="/usr/lib/x86_64-linux-gnu/libcurl.so.4" julia sift.jl
 ```
-julia
 
-# Activate the environment
-] activate .
 
-# Install the packages
-] instantiate
-```
+## OLD:
+
+
+# ## Julia Setup
+# 
+# From inside the docker container
+# ```
+# julia
+# 
+# # Activate the environment
+# ] activate .
+# 
+# # Install the packages
+# ] instantiate
+# ```
 

src/sift.jl

@@ -0,0 +1,22 @@
+# make sure it uses the system-instaled python backend
+ENV["JULIA_CONDAPKG_BACKEND"] = "Null"
+ENV["JULIA_PYTHONCALL_EXE"] = "/usr/bin/python3"
+
+using PythonCall
+
+# import opencv
+
+cv = pyimport("cv2")
+
+# run the sift commands
+
+img = cv.imread("frb.jpg")
+gray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
+
+sift = cv.SIFT_create()
+
+kp = sift.detect(gray, pybuiltins.None)
+
+img = cv.drawKeypoints(gray, kp, img)
+
+cv.imwrite("sift_keypoints_julia.jpg", img)

src/sift.py

@@ -0,0 +1,12 @@
+import numpy as np
+import cv2 as cv
+
+img = cv.imread("frb.jpg")
+gray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
+
+sift = cv.SIFT_create()
+kp = sift.detect(gray, None)
+
+img = cv.drawKeypoints(gray, kp, img)
+
+cv.imwrite('sift_keypoints.jpg', img)