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Azure's Computer Vision API includes Optical Character Recognition (OCR) capabilities that extract printed or handwritten text from images. You can extract text from images, such as photos of license plates or containers with serial numbers, as well as from documents - invoices, bills, financial reports, articles, and more.

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Read API

The Computer Vision Read API is Azure's latest OCR technology (learn what's new) that extracts printed text (in several languages), handwritten text (English only), digits, and currency symbols from images and multi-page PDF documents. It's optimized to extract text from text-heavy images and multi-page PDF documents with mixed languages. It supports detecting both printed and handwritten text in the same image or document.

Input requirements

The Read call takes images and documents as its input. They have the following requirements:

• Supported file formats: JPEG, PNG, BMP, PDF, and TIFF
• For PDF and TIFF files, up to 2000 pages (only first two pages for the free tier) are processed.
• The file size must be less than 50 MB (4 MB for the free tier) and dimensions at least 50 x 50 pixels and at most 10000 x 10000 pixels.
• The PDF dimensions must be at most 17 x 17 inches, corresponding to legal or A3 paper sizes and smaller.

Read 3.2 preview allows selecting page(s)

With the Read 3.2 preview API, for large multi-page documents, you can provide specific page numbers or page ranges as an input parameter to extract text from only those pages. This is a new input parameter in addition to the optional language parameter.

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Note

Language input

The Read call has an optional request parameter for language. This is the BCP-47 language code of the text in the document. Read supports auto language identification and multilingual documents, so only provide a language code if you would like to force the document to be processed as that specific language.

The Read call

The Read API's Read call takes an image or PDF document as the input and extracts text asynchronously. The call returns with a response header field called Operation-Location. The Operation-Location value is a URL that contains the Operation ID to be used in the next step.

Note

Billing

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The Computer Vision pricing page includes the pricing tier for Read. Each analyzed image or page is one transaction. If you call the operation with a PDF or TIFF document containing 100 pages, the Read operation will count it as 100 transactions and you will be billed for 100 transactions. If you made 50 calls to the operation and each call submitted a document with 100 pages, you will be billed for 50 X 100 = 5000 transactions.

The Get Read Results call

The second step is to call Get Read Results operation. This operation takes as input the operation ID that was created by the Read operation. It returns a JSON response that contains a status field with the following possible values. You call this operation iteratively until it returns with the succeeded value. Use an interval of 1 to 2 seconds to avoid exceeding the requests per second (RPS) rate.

Note

The free tier limits the request rate to 20 calls per minute. The paid tier allows 10 requests per second (RPS) that can be increased upon request. Use the Azure support channel or your account team to request a higher request per second (RPS) rate.

When the status field has the succeeded value, the JSON response contains the extracted text content from your image or document. The JSON response maintains the original line groupings of recognized words. It includes the extracted text lines and their bounding box coordinates. Each text line includes all extracted words with their coordinates and confidence scores.

Note

The data submitted to the Read operation are temporarily encrypted and stored at rest, and deleted within 48 hours. This lets your applications retrieve the extracted text as part of the service response.

Sample JSON output

See the following example of a successful JSON response:

Read 3.2 preview adds text line style (Latin languages only)

The Read 3.2 preview API outputs an appearance object classifying whether each text line is print or handwriting style, along with a confidence score. This feature is supported only for Latin languages.

Get started with the Computer Vision REST API or client library quickstarts to start integrating OCR capabilities into your applications.

Supported languages for print text

The Read API supports extracting printed text in English, Spanish, German, French, Italian, Portuguese, and Dutch languages.

See the Supported languages for the full list of OCR-supported languages.

Read 3.2 preview adds Simplified Chinese and Japanese

The Read 3.2 API public preview adds support for Simplified Chinese and Japanese. If your scenario requires supporting more languages, see the OCR API section.

Supported languages for handwritten text

The Read operation currently supports extracting handwritten text exclusively in English.

Use the REST API and SDK

The Read 3.x REST API is the preferred option for most customers because of ease of integration and fast productivity out of the box. Azure and the Computer Vision service handle scale, performance, data security, and compliance needs while you focus on meeting your customers' needs.

Deploy on-premise with Docker containers

The Read Docker container (preview) enables you to deploy the new OCR capabilities in your own local environment. Containers are great for specific security and data governance requirements.

Example outputs

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Text from images

The following Read API output shows the extracted text from an image with different text angles, colors, and fonts.

Text from documents

Read API can also take PDF documents as input.

Handwritten text

The Read operation extracts handwritten text from images (currently only in English).

Printed text

The Read operation can extract printed text in several different languages.

Mixed language documents

The Read API supports images and documents that contain multiple different languages, commonly known as mixed language documents. It works by classifying each text line in the document into the detected language before extracting its text contents.

OCR API

The OCR API uses an older recognition model, supports only images, and executes synchronously, returning immediately with the detected text. See the OCR supported languages then Read API.

Data privacy and security

As with all the cognitive services, developers using the Read/OCR services should be aware of Microsoft policies on customer data. See the Cognitive Services page on the Microsoft Trust Center to learn more.

Note

The Computer Vison 2.0 RecognizeText operations are in the process of getting deprecated in favor of the new Read API covered in this article. Existing customers should transition to using Read operations.

Next steps

• Get started with the Computer Vision REST API or client library quickstarts.
• Learn about the Read REST API.
• Learn about the Read 3.2 public preview REST API with added support for Simplified Chinese and Japanese.

Summary: MS Excel is a program that helps users to import and format data to design and create spreadsheets, charts, graphs, and perform numerous functions. Users can work with functions and formulae available in the application. However, changing the file properties and formatting of rows and columns, may occasionally result in data to disappear in Excel. In this blog, you will find out the reasons for data disappearance and the solutions including Excel File Repair Software to retrieve that data.

Whether you are a Business Analyst, Marketing Manager or a Teacher, MS Excel lets you organize, interpret data more clearly and thus prepares you for vital scenarios and changes through calculated forecast but this forecast may not be as reliable if even a small portion of data disappears or erased from the Excel spreadsheet/cell.

The probable reasons of data disappearing in MS Excel are:

1. Unsaved work
   Most Excel users forget to save their file at regular intervals, while they are working on their spreadsheet. As a result, if you close the workbook after entering some valuable information and then click on ‘No’ button when the popup displays the message to save the file, then MS Excel file may be saved without the recently added information, and the unsaved data disappears from the spreadsheet. Though Excel sheet has a time-setter to save the information, automatically, if the time setter is set at the lower time, the unsaved data is lost.
2. Format Conversion
   Microsoft provides an option to save an Excel file in various formats – spreadsheet, text, webpage and more. At times, saving the spreadsheet in a different format may lead to missing data. For example, keeping the spreadsheet into basic text results in the disappearance of all the formulae and calculations applied on the data. In such cases, remove all calculations before saving the file. If the sheet is shared on multiple computers, then save the file in compatibility mode.
3. Merging Cells
   Two or more cell-data is combined to make one large cell. This technique is primarily used with the Title of the spreadsheet. If there is data in two or more cells, then only the data in the top left cell is displayed, and data in all other cells are deleted. If the other merged cells have been populated with data then after merging, this data is not featured and it does not appear even after remerging the cells.
4. Cell Formatting
   Cells and Data in the cells can be displayed in different colours to make the spreadsheet simple to create and infer. You may experience data loss when you try to change the data also along with changing the colour of data. Though the information may exist, the data may show an error due to following reasons:
   • White coloured text will not show in white coloured cell
   • Large font sized data may not appear in small-sized cell
   • Calculations may show error after cell-formatting

As discussed earlier, Excel files are essential for the professionals. Hence the recovery of these files is a must. Microsoft has provided an option to repair the Excel files with the help of Excel repair option. Follow the steps to fix Excel file:

1. Reboot the system – Before starting with repair function, it is mandatory to reboot the system as rebooting ensures that any file used by the system is fully released.
2. Go to Control Panel and click on Programs and Settings
3. Locate Office and right click on it. Click on Change from the available options.
4. Repair option is displayed –Click on Repair option to repair MS Excel file
5. Open MS Excel to check if the data is fixed.
6. Still unable to resolve the issue? Re-install MS Office on your system, but take care that re-installing will not repair the current Excel file and hence you cannot retrieve the disappeared data from that file.

If the above steps do not resolve the problem, opt for an Excel repair tool like Stellar Repair for Excel. This software has a proven track record of repairing corrupt or damaged Excel files to recover disappeared excel sheet content.

The software helps in:

• Fixes all corruption errors – a prominent reason to use this software. It helps in getting back the data which has disappeared.
• Repairs a single as well as multiple Excel files
• Recovers all components of XLS/XLSX files – tables, chart sheet, cell comment, image and more
• Does not hamper the worksheet properties and cell formatting
• Supports the latest as well as earlier version

Excel Repair software repairs the Excel file in these simple steps

• Launch and open the software.
• Select the corrupt Excel file. If the file location is not available, then find the Excel file by clicking on Search option.

• Click on Repair to scan the corrupt file.

• Once the scanning is complete, verify the components of Excel file and check if the available preview shows complete data that disappeared from Excel.

• Save file at default location or preferred location.

After scanning and repairing, the professional software creates a new file and provides an option to save this new Excel file in the default location or preferred location.

Conclusion

Better to repair than suffer the loss when data or text disappears in Excel and professional software ensures that users get back all the data in the form of a new Excel file. Stellar Repair for Excel tool repairs the corrupt file without modifying the original content and file-format. The user interface lets you perform the functions without a formal software training and ensures that even the non-technical computer users can use this software.