convert numbers in png to text


I was doing a project, and I needed to convert these images to numbers to be able to calculate a series of operations, doing a little research I found that this would be possible with the Tess4j Node, however whenever I try to pass the image it does not recognize anything at all, I wanted to know, do the Images do you have to have any special characteristics to be able to convert from png to text? Does the node recognize these numbers?

Hello @Jalvear,
have you just used the Tess4J node without any preprocessing of the image? Then the output will probably be not that great. You could for example use the Image Normalizer – KNIME Hub node.
Additionally, you can have a look at the documentation that describes how to improve the quality of the output (Improving the quality of the output | tessdoc).