Image processing
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The accuracy and reliability of text recognition is highly dependent on the quality of the original image. Aspose.OCR Cloud offers a large number of fully automated and manual image processing filters that improve the image and adjust it for OCR.
| Filter | Action | Usage scenarios |
|---|---|---|
| Skew correction | Automatically straighten images aligned at a slight angle (up to 15 degrees) to the horizontal. | Skewed images |
| Rotation | Manually rotate severely skewed or inverted images. | Images rotated by more than 15 degrees. |
| Dewarping | Straighten page curvature and fix camera lens distortion. | Photos of curved pages Ultra wide-angle and fisheye photos |
| Upsampling | Intellectually increase the image resolution to improve small font recognition and detection of dense lines. | Medication guides Food labels Small images from the internet |
| Binarization | Convert images to black and white automatically or manually adjust the criteria that determines whether a pixel is considered black or white. | Full color low contrast images |
| Contrast correction | Automatically adjust the image contrast to emphasize small details. | Photos, old papers, text on a background |