Image Quality Requirements
Below are the requirements for size and quality of document images captured by any device, which are necessary for successful image processing by Document Reader SDK:
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LIGHTING
Good lighting
Good lighting helps to achieve better OCR results. If the image is too dark or too brigh the document might not be processed successfully.
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REFLECTIONS
Avoid reflections
Glares and reflections interfere with processing and reduce data extraction accuracy. We recommend not to use the flash of your mobile device when capturing document images.
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SHARPNESS
Focus and sharpness
Make sure the image is clear and there are no blurred areas.
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ANGLE
The Angle Direction
The tilt angle of the document should not exceed 10 degrees in any direction (horizontal or vertical).
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MARGINS
Margins - too small
Make sure there is minimal space around the document. It is recommended that the document takes up 70-80% of the image.
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MARGINS
Margins - too big
Make sure the space around the document does not take up more than 20-30% of the image. It is recommended that the document takes up 70-80% of the image.
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CONTRAST
Clear Contrast
The document should be in clear contrast to the background. A light-colored document on a light background, as well as a dark-colored document on a dark background, might not be recognized.
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RESOLUTION
Resolution of the image
To achieve a good quality of recognition of identification documents, we recommend that you provide images captured by a camera with a resolution of at least Full HD (1920×1080) and autofocus.
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OBJECTS
Extraneous objects
Make sure your hands or other objects do not cover document data.
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