Azure OCR [printed text] is not reading the receipt lines in the right order
Application Goal: read the receipt image, extract the store/organization name along with the total amount paid. Feed it to web-form for auto-filling & submission.
Post Request - "https://*.cognitiveservices.azure.com/vision/v2.0/recognizeText?{params}
Get Request - https://*.cognitiveservices.azure.com/vision/v2.0/textOperations/{operationId}
however when I get the results back, sometimes it's confusing in line ordering (see below picture [similar results in JSON response])
This mixing is resulting in getting the total as $0.88
Similar situations are present for 2 out of 9 testing receipts.
Q: Why it's working for similar & different structured receipts but for some reason not consistent for all? Also, any ideas how to get around it?
I had a quick look to your case.
OCR Result
As you mentioned, the results are not ordered as you thought. I had a quick look to the bounding boxes values and I don't know how they are ordered. You could try to consolidate fields based on that, but there is a service that is already doing it for you.
Form Recognizer:
Using Form Recognizer and your image, I got the following results for your receipt.
As you can see below, the understandingResults contains the total with its value ("value": 9.11), the MerchantName ("Chick-fil-a") and other fields.
{
"status": "Succeeded",
"recognitionResults": [
{
"page": 1,
"clockwiseOrientation": 0.17,
"width": 404,
"height": 1226,
"unit": "pixel",
"lines": [
{
"boundingBox": [
108,
55,
297,
56,
296,
71,
107,
70
],
"text": "Welcome to Chick-fil-a",
"words": [
{
"boundingBox": [
108,
56,
169,
56,
169,
71,
108,
71
],
"text": "Welcome",
"confidence": "Low"
},
{
"boundingBox": [
177,
56,
194,
56,
194,
71,
177,
71
],
"text": "to"
},
{
"boundingBox": [
201,
56,
296,
57,
296,
71,
201,
71
],
"text": "Chick-fil-a"
}
]
},
...
OTHER LINES CUT FOR DISPLAY
...
]
}
],
"understandingResults": [
{
"pages": [
1
],
"fields": {
"Subtotal": null,
"Total": {
"valueType": "numberValue",
"value": 9.11,
"text": "$9.11",
"elements": [
{
"$ref": "#/recognitionResults/0/lines/32/words/0"
},
{
"$ref": "#/recognitionResults/0/lines/32/words/1"
}
]
},
"Tax": {
"valueType": "numberValue",
"value": 0.88,
"text": "$0.88",
"elements": [
{
"$ref": "#/recognitionResults/0/lines/31/words/0"
},
{
"$ref": "#/recognitionResults/0/lines/31/words/1"
},
{
"$ref": "#/recognitionResults/0/lines/31/words/2"
}
]
},
"MerchantAddress": null,
"MerchantName": {
"valueType": "stringValue",
"value": "Chick-fil-a",
"text": "Chick-fil-a",
"elements": [
{
"$ref": "#/recognitionResults/0/lines/0/words/2"
}
]
},
"MerchantPhoneNumber": {
"valueType": "stringValue",
"value": "+13092689500",
"text": "309-268-9500",
"elements": [
{
"$ref": "#/recognitionResults/0/lines/4/words/0"
}
]
},
"TransactionDate": {
"valueType": "stringValue",
"value": "2019-06-21",
"text": "6/21/2019",
"elements": [
{
"$ref": "#/recognitionResults/0/lines/6/words/0"
}
]
},
"TransactionTime": {
"valueType": "stringValue",
"value": "13:00:57",
"text": "1:00:57 PM",
"elements": [
{
"$ref": "#/recognitionResults/0/lines/6/words/1"
},
{
"$ref": "#/recognitionResults/0/lines/6/words/2"
}
]
}
}
}
]
}
More details on Form Recognizer: https://azure.microsoft.com/en-us/services/cognitive-services/form-recognizer/