4/28/2023 0 Comments Convert pdf to text searchable pdfAn image can be loaded in the left panel and the immediate enhancement results can be seen in the right panel. Ensure to select the target page type in the DCO tree. Configure the settings in the Image Enhancement ruleset to adjust images as needed. Image enhancement actions also have an automatic rotate, but they rotate based on image geometry while the OCRA rotation will rotate based on the target language.Īfter that, the Image Enhancement ruleset is used to deskew the images. Here the action RotateImageOCR_A is used because it rotates the image based on the target language, which is usually the most reliable method. If you find there are other enhancements that will also clean up the images, such as despeckle or line removal, they can be run as well. Border cropping or removal might also help. At a minimum, run automatic rotation and deskew on images that will be recognized. Color pages of 24 bits or less can be recognized.Ĭonfigure Image Enhancement to run on each image. If color pages need to stay in color, that is possible as well. Some image enhancement functionality requires a black and white image. This is not required but can improve recognition quality by dropping out light shaded backgrounds. This conversion is setup to convert gray scale and color pages within the PDF to black and white.Fax is a compression that produces very small black and white images without losing quality. Always use a loss-less compression for images that will have recognition performed. The conversion to image is set to 18, which is a loss-less fax compression.This prevents any extraction or recognition on the PDF during the conversion process as it is not needed at this step. The actions enable the convPdfIgnoreContent variable.This rueset snapshot from Datacap Studio converts a PDF to separate images without performing recognition in this step. The images must to be fixed to recognize well. While it is possible to also perform recognition in this step, there is no need because it will occur when building the PDF. This is an example ruleset that will convert the PDF to images. The following shows the basic steps that can be integrated into an application as needed: Convert the images to a searchable PDF.Use image enhancement to fix rotation, deskew, and enhance the images.The following are general steps to perform full page recognition in this situation: Because the document is split into multiple pages, the new PDF can be built from all of the pages or from a subset of pages. These are very strong reasons to first create an image then perform recognition, and why it is typically the best path. Image cleanup and adjustment though border removal, despeckling, line removal, and so on.The following are the steps that can only be performed on a separate image: In image processing, the image can be adjusted to improve the quality of the recognized text. ![]() The primary benefit to first converting to an image is that this step allows for image processing prior to recognition. The first approach, where the PDF is first converted to an image than the images are rebuilt into a PDF, is usually the best approach. Convert the existing PDF to a searchable PDF in one step.Convert the PDF pages to images then combine those images into a searchable PDF.There are the following two basic approaches to recognize text within a PDF:
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