Upload images to HPCC Systems

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In HPCC Systems, pictures need to be uploaded to HPCC Systems before they can be accessed. This blog post documents how to upload an image to HPCC Systems

First upload the image to Landing Zones in ECL Watch:

image-20230719123923331

After uploading, select this picture, and in Import, select BLOB:

image-20230719123949833

Set up as follows:

image-20230719124004497

Then use the following code to get the Hex content of this image:

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imageRecord := RECORD
  STRING filename;
  DATA   image;   
       //first 4 bytes contain the length of the image data
  UNSIGNED8  RecPos{virtual(fileposition)};
END;

imageData := DATASET('~Your::custom::Name',imageRecord,FLAT);
OUTPUT(imageData, NAMED('elephant'));

If you want to convert this Hex content into np array for subsequent processing, you can use the following code:

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STRING hexToNparry(DATA byte_array):= EMBED(Python)
  from PIL import Image
  import numpy as np
  import io
  bytes_data = bytes(byte_array)
  image = Image.open(io.BytesIO(bytes_data))
  I_array = np.array(image)			# this is all you need
  return ''.join(str(i) for i in I_array.shape)		# check the shape of this image, height * width* channel
ENDEMBED;
OUTPUT(hexToNparry(imageData[1].image), NAMED('npShape'));