Use of the mmocr exported model

[Daisy5296]

Hi I would like to use the exported mmocr models, either onnx or tensorrt, in my own project without mmdeploy apis. The process then would be similar like: data preprocess ->model inference->output decode->post-process. However, I am very unfarmilar with mmdeploy，and cannot find what are the specific steps used in the stage of preprocess, decode and post-process. Could anyone please help to explain a bit, or pointed out a proper position in the code that these steps are presented? Maybe take DBNET and SATRN for example. Thanks a lot!