Changeset 29648 for gs2-extensions/video-and-audio/trunk

Timestamp:

2014-12-19T10:43:16+13:00 (9 years ago)

Author:

jmt12

Message:

Extending the Image document class with SIFT processing so as to trigger greater CPU load. Makes use of stream gobbler... gobble-gobble

File:

• gs2-extensions/video-and-audio/trunk/src/opt/Terrier/ImageDocument.java (modified) (1 diff)

gs2-extensions/video-and-audio/trunk/src/opt/Terrier/ImageDocument.java

@@ -185 +185 @@
       logger.error("Exception while creating dummy text stream: ", e);
     }
+
+    // Use OpenSIFT to generate a featureset (in Oxford format) for this image
+    logger.info("ImageDocument - generate and record SIFT features");
+    try
+    {
+      String sift_command[] = {
+        "siftfeat",
+        "-x",
+        source_path.toString()
+      };
+      logger.info("ImageDocument - sift command: " + Arrays.toString(sift_command));
+      Process sift_process = Runtime.getRuntime().exec(sift_command);
+      // we'd usually send STDERR to /dev/null, but a streamgobbler is easier
+      // in Java
+      StreamGobbler sift_process_error_gobbler = new StreamGobbler(sift_process.getErrorStream());
+      sift_process_error_gobbler.start();
+      // the SIFT features, in Oxford format, will arrive from STDOUT
+      BufferedReader sift_br = new BufferedReader(new InputStreamReader(sift_process.getInputStream()));
+      String line;
+      StringBuffer oxford_features;
+      while ((line = sift_br.readLine()) != null)
+      {
+        oxford_features.append(line);
+      }
+      // this command blocks until process completes (emit return value) which
+      // should be shortly after it emits the last line of SIFT feature data
+      int sift_status = sift_process.waitFor();
+      this.properties.put("sift", oxford_features.toString());
+    }
+    catch (Exception e)
+    {
+      logger.error("Exception while generating preview image: ", e);
+    }
+
     logger.info("ImageDocument - Complete!");
   }