For the correct cropping and the recognition of document images, we strongly recommend keeping the document level stable (in other words, make sure that the angle of the document does not exceed 10 degrees in any direction (horizontal or vertical)). More information about image quality requirements can be found here.
However, there are times when the document is tilted too much at any angle and then we cannot guarantee a successful document verification process. In such a situation, you can manually set the parameter in which you specify the deviation from the angle of 90 degrees:
{"processParam":{"perspectiveAngle":7, "log":true,"scenario":"DocType",
If the document image tilt level is equal to or greater than the specified deviation value (here it's 7), then the retrying of the document image acquisition process will be initiated until the angle on the document image fits the value above.
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