5. Handling column names

Within straditize, you can assign a name to each of the columns in your diagram, which will then turn up as the header in your final export. Usually these names are the titles of your columns, e.g. such as here

sample diagram header

To enter the names of the columns, hit the Edit column names button in the Column names section of the straditizer control. This will open a dialog to handle the column names:

column names editor

On the left side, you have a rotated version of the image that you can control with the options above it. To navigate in this window, place your mouse over it and then you can move (pan) the image with left-click.

Zooming in and out is done via right-click. To zoom in, hold your right mouse button and move your cursor to the upper right corner of your diagram. To zoom out, move it to the lower left corner.

On the right side you have a table with the column names. Initially, these are just increasing numbers starting from 0 for your first column. If you select one column, it will be highlighted in the left image:

highlighted first column

You can now enter the name of the column, in this case Artemisia

highlighted first column

Automatic optical character recognition (OCR)

You don’t have to type the column name, you can also use the builtin text recognition. For this, we rely on the tesseract software that can be installed (on linux and MacOS) via:

conda install -c conda-forge tesseract

see the tesseract feedstock on conda-forge. If you want to automatically find the column names, you also need tesserocr to be installed which can be done via:

pip install tesserocr


conda install -c chilipp tesserocr  # on linux/MacOS

(see https://pypi.org/project/tesserocr/ for more installation options, in particular for Windows).

1. Use a high resolution version of the image

To improve the result of the text recognition, we recommend to use a sufficient resolution of about 600 dpi. If the image that you are digitizing does not have this resolution, you can optionally load a higher resolution version of it using the Load HR image button at the upper left of the dialog.

We also recommend to remove everything in this file but the column names to improve the text recognition.

2. Automatically find all column names

Check the all columns checkbox and click the Find column names button. This then will look for column names in the image that is displayed on the left of the table and insert them into the table.

3. Separate treatment of column names

Now, select the first column in the table, zoom in such that you can see the name of the first column and click the Select column name button.

You won’t be able to zoom or pan in your plot anymore, but you can now draw a rectangle in the plot around the name of the first column or use click the Find column names button (without having the all columns checkbox checked) and it will show up in the plot on the lower right of the diagram.

picture of the first column name

Here you see the result of the low resolution. If we instead specify a higher resolution image (see above), this can look much better

picture of the first column name in highres

Now click the Recognize button at the bottom and it will use tesseract to read the text in the image and fill in the table

recognized first column

You can now select the next column or click the Apply button on the lower left. The latter will reenable the navigation (pan and zoom) in the plot.