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Receipt OCR Ruby

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The Ruby OCR SDK supports the Receipt API.

Using the sample below, we are going to illustrate how to extract the data that we want using the OCR SDK.
Receipt sample

Quick-Start

require 'mindee'

# Init a new client
mindee_client = Mindee::Client.new(api_key: 'my-api-key')

# Load a file from disk
input_source = mindee_client.source_from_path('/path/to/the/file.ext')

# Parse the file
result = mindee_client.parse(
  input_source,
  Mindee::Product::Receipt::ReceiptV5
)

# Print a full summary of the parsed data in RST format
puts result.document

# Print the document-level parsed data
# puts result.document.inference.prediction

You can also call this product asynchronously:

require 'mindee'

# Init a new client
mindee_client = Mindee::Client.new(api_key: 'my-api-key')

# Load a file from disk
input_source = mindee_client.source_from_path('/path/to/the/file.ext')

# Parse the file
result = mindee_client.enqueue_and_parse(
  input_source,
  Mindee::Product::Receipt::ReceiptV5
)

# Print a full summary of the parsed data in RST format
puts result.document

# Print the document-level parsed data
# puts result.document.inference.prediction

Output (RST):

########
Document
########
:Mindee ID: d96fb043-8fb8-4adc-820c-387aae83376d
:Filename: default_sample.jpg

Inference
#########
:Product: mindee/expense_receipts v5.3
:Rotation applied: Yes

Prediction
==========
:Expense Locale: en-GB; en; GB; GBP;
:Purchase Category: food
:Purchase Subcategory: restaurant
:Document Type: EXPENSE RECEIPT
:Purchase Date: 2016-02-26
:Purchase Time: 15:20
:Total Amount: 10.20
:Total Net: 8.50
:Total Tax: 1.70
:Tip and Gratuity:
:Taxes:
  +---------------+--------+----------+---------------+
  | Base          | Code   | Rate (%) | Amount        |
  +===============+========+==========+===============+
  | 8.50          | VAT    | 20.00    | 1.70          |
  +---------------+--------+----------+---------------+
:Supplier Name: Clachan
:Supplier Company Registrations: Type: VAT NUMBER, Value: 232153895
                                 Type: VAT NUMBER, Value: 232153895
:Supplier Address: 34 Kingley Street W1B 50H
:Supplier Phone Number: 02074940834
:Receipt Number: 54/7500
:Line Items:
  +--------------------------------------+----------+--------------+------------+
  | Description                          | Quantity | Total Amount | Unit Price |
  +======================================+==========+==============+============+
  | Meantime Pale                        | 2.00     | 10.20        |            |
  +--------------------------------------+----------+--------------+------------+

Page Predictions
================

Page 0
------
:Expense Locale: en-GB; en; GB; GBP;
:Purchase Category: food
:Purchase Subcategory: restaurant
:Document Type: EXPENSE RECEIPT
:Purchase Date: 2016-02-26
:Purchase Time: 15:20
:Total Amount: 10.20
:Total Net: 8.50
:Total Tax: 1.70
:Tip and Gratuity:
:Taxes:
  +---------------+--------+----------+---------------+
  | Base          | Code   | Rate (%) | Amount        |
  +===============+========+==========+===============+
  | 8.50          | VAT    | 20.00    | 1.70          |
  +---------------+--------+----------+---------------+
:Supplier Name: Clachan
:Supplier Company Registrations: Type: VAT NUMBER, Value: 232153895
                                 Type: VAT NUMBER, Value: 232153895
:Supplier Address: 34 Kingley Street W1B 50H
:Supplier Phone Number: 02074940834
:Receipt Number: 54/7500
:Line Items:
  +--------------------------------------+----------+--------------+------------+
  | Description                          | Quantity | Total Amount | Unit Price |
  +======================================+==========+==============+============+
  | Meantime Pale                        | 2.00     | 10.20        |            |
  +--------------------------------------+----------+--------------+------------+

Field Types

Standard Fields

These fields are generic and used in several products.

Basic Field

Each prediction object contains a set of fields that inherit from the generic Field class.
A typical Field object will have the following attributes:

  • value (String, Float, Integer, Boolean): corresponds to the field value. Can be nil if no value was extracted.
  • confidence (Float, nil): the confidence score of the field prediction.
  • bounding_box (Mindee::Geometry::Quadrilateral, nil): contains exactly 4 relative vertices (points) coordinates of a right rectangle containing the field in the document.
  • polygon (Mindee::Geometry::Polygon, nil): contains the relative vertices coordinates (Point) of a polygon containing the field in the image.
  • page_id (Integer, nil): the ID of the page, always nil when at document-level.
  • reconstructed (Boolean): indicates whether an object was reconstructed (not extracted as the API gave it).

Aside from the previous attributes, all basic fields have access to a to_s method that can be used to print their value as a string.

Amount Field

The amount field AmountField only has one constraint: its value is a Float (or nil).

Classification Field

The classification field ClassificationField does not implement all the basic Field attributes. It only implements value, confidence and page_id.

Note: a classification field's value is always a String`.

Company Registration Field

Aside from the basic Field attributes, the company registration field CompanyRegistrationField also implements the following:

  • type (String): the type of company.

Date Field

Aside from the basic Field attributes, the date field DateField also implements the following:

  • date_object (Date): an accessible representation of the value as a JavaScript object.

Locale Field

The locale field LocaleField only implements the value, confidence and page_id base Field attributes, but it comes with its own:

  • language (String): ISO 639-1 language code (e.g.: en for English). Can be nil.
  • country (String): ISO 3166-1 alpha-2 or ISO 3166-1 alpha-3 code for countries (e.g.: GRB or GB for "Great Britain"). Can be nil.
  • currency (String): ISO 4217 code for currencies (e.g.: USD for "US Dollars"). Can be nil.

String Field

The text field StringField only has one constraint: it's value is a String (or nil).

Taxes Field

Tax

Aside from the basic Field attributes, the tax field TaxField also implements the following:

  • rate (Float): the tax rate applied to an item can be expressed as a percentage. Can be nil.
  • code (String): tax code (or equivalent, depending on the origin of the document). Can be nil.
  • base (Float): base amount used for the tax. Can be nil.

Note: currently TaxField is not used on its own, and is accessed through a parent Taxes object, an array-like structure.

Taxes (Array)

The Taxes field represents an array-like collection of TaxField objects. As it is the representation of several objects, it has access to a custom to_s method that can render a TaxField object as a table line.

Specific Fields

Fields which are specific to this product; they are not used in any other product.

Line Items Field

List of line item details.

A ReceiptV5LineItem implements the following attributes:

  • description (String): The item description.
  • quantity (Float): The item quantity.
  • total_amount (Float): The item total amount.
  • unit_price (Float): The item unit price.

Attributes

The following fields are extracted for Receipt V5:

Purchase Category

category (ClassificationField): The purchase category among predefined classes.

Possible values include:

  • toll
  • food
  • parking
  • transport
  • accommodation
  • gasoline
  • telecom
  • miscellaneous
puts result.document.inference.prediction.category.value

Purchase Date

date (DateField): The date the purchase was made.

puts result.document.inference.prediction.date.value

Document Type

document_type (ClassificationField): One of: 'CREDIT CARD RECEIPT', 'EXPENSE RECEIPT'.

Possible values include:

  • expense_receipt
  • credit_card_receipt
puts result.document.inference.prediction.document_type.value

Line Items

line_items (Array<ReceiptV5LineItem>): List of line item details.

for line_items_elem in result.document.inference.prediction.line_items do
  puts line_items_elem.value
end

Expense Locale

locale (LocaleField): The locale detected on the document.

puts result.document.inference.prediction.locale.value

Receipt Number

receipt_number (StringField): The receipt number or identifier.

puts result.document.inference.prediction.receipt_number.value

Purchase Subcategory

subcategory (ClassificationField): The purchase subcategory among predefined classes for transport and food.

Possible values include:

  • plane
  • taxi
  • train
  • restaurant
  • shopping
puts result.document.inference.prediction.subcategory.value

Supplier Address

supplier_address (StringField): The address of the supplier or merchant.

puts result.document.inference.prediction.supplier_address.value

Supplier Company Registrations

supplier_company_registrations (Array<CompanyRegistrationField>): List of company registrations associated to the supplier.

for supplier_company_registrations_elem in result.document.inference.prediction.supplier_company_registrations do
  puts supplier_company_registrations_elem.value
end

Supplier Name

supplier_name (StringField): The name of the supplier or merchant.

puts result.document.inference.prediction.supplier_name.value

Supplier Phone Number

supplier_phone_number (StringField): The phone number of the supplier or merchant.

puts result.document.inference.prediction.supplier_phone_number.value

Taxes

taxes (Array<TaxField>): List of tax lines information.

for taxes_elem in result.document.inference.prediction.taxes do
  puts taxes_elem.value
end

Purchase Time

time (StringField): The time the purchase was made.

puts result.document.inference.prediction.time.value

Tip and Gratuity

tip (AmountField): The total amount of tip and gratuity.

puts result.document.inference.prediction.tip.value

Total Amount

total_amount (AmountField): The total amount paid: includes taxes, discounts, fees, tips, and gratuity.

puts result.document.inference.prediction.total_amount.value

Total Net

total_net (AmountField): The net amount paid: does not include taxes, fees, and discounts.

puts result.document.inference.prediction.total_net.value

Total Tax

total_tax (AmountField): The total amount of taxes.

puts result.document.inference.prediction.total_tax.value

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Updated about 2 months ago