How to inference in test images?

[Remember2018]

Hi, Dear All, thanks a lot for this great project!
I have trained the model with 32x128 OCR images successfully. I have a question, how do we test the new test images with the model? Using sliding window? I mean generally speaking, the images detected from the previous text detection branch are variable lengths, how do we input these images into the model to get the prediction? I thought about the sliding window, but could you please provide some advice or reference papers on this? Thanks.