cordova-plugin-mobile-ocr
Advanced tools
| Introduction | Supported_Platforms | Installation_Steps | Plugin_Usage | Working_Examples | More_about_us! |
|---|
BREAKING CHANGES introduced in plugin version 2.0.0 and 3.0.0. Older version will run as expected! In 2.x.x
returnTypeinput was removed! In 3.x.x if no text was found in the image, the success callback will be called instead of the error callback along with a new keyfoundTextwith boolean value. Please see example objects at the very end for more explanation.
DOCUMENTATION here applies only to plugin ver 3.x.x! The respective documentation of each of the versions is available with the npm release
This plugin was made possible because of google mobile vision text recognition API. The supported languages are listed in the link. This plugin is absolutely free and will work offline once install is complete. All required files required for Text Recognition are downloaded during install if necessary space is available.
This plugin defines a global textocr object, which provides an method that accepts image uri or base64 inputs. If some text was detected in the image, this text will be returned as a string. The imageuri or base64 can be send to the plugin using any another plugin like cordova-plugin-camera or cordova-plugin-document-scanner. Although the object is attached to the global scoped window, it is not available until after the deviceready event.
document.addEventListener("deviceready", onDeviceReady, false);
function onDeviceReady() {
console.log(textocr);
}
This requires cordova 7.1.0+ , cordova android 6.4.0+ and cordova ios 4.3.0+
npm link :- https://www.npmjs.com/package/cordova-plugin-mobile-ocr
cordova plugin add cordova-plugin-mobile-ocr
For Android that is all.
For iOS please also follow the steps below.
pod update.textocr.recText(sourceType, /*returnType,*/ uriOrBase, successCallback, errorCallback) //returnType no longer accepted from plugin version 2.x.x
textocr.recText
The textocr.recText function accepts image data as uri or base64 and uses google mobile vision to recognize text and return the recognized text as string on its successcallback.
sourceType
The sourceType parameter can take values 0,1,2,3 or 4 each of which are explained in detail in the table below. sourceType is an Int within the native code.
| sourceType | uriOrBase | Accuracy | Recommendation | Notes |
|---|---|---|---|---|
| 0 | NORMFILEURI | Very High | Recommended | On android this is same as NORMNATIVEURI |
| 1 | NORMNATIVEURI | Very High | Not Recommended (See note below) | On android this is same as NORMFILEURI |
| 2 | FASTFILEURI | Very Low | Not Recommended | On android this is same as FASTNATIVEURI. Compression allows for faster processing but sacrifices a lot of accuracy. Best used if ocr images will always be extremely large with large text in them. |
| 3 | FASTNATIVEURI | Very Low | Not Recommended | On android this is same as FASTFILEURI. Compression allows for faster processing but sacrifices a lot of accuracy. Best used if ocr images will always be extremely large with large text in them. |
| 4 | BASE64 | Very High | Not Recommended | Extremely memory intensive and thus not recommended |
Note :- NORMNATIVEURI & FASTNATIVEURI for iOS uses deprecated methods to access images. This is to support the camera plugin which still uses the deprecated methods to return native image URI's using ALAssetsLibrary. This plugin uses non deprecated PHAsset library whose deprecated method fetchAssets(withALAssetURLs:options:) is used to retrieve the image data.
Note :- This input is no longer accepted from plugin version 2.0.0 and above.
The returnType parameter can take values 0,1,2 or 3 each of which are explained in detail in the table below. If a wrong value is passed into this parameter it will default to 3 or ALL. See the image below the table to get a better understanding of BLOCKS, LINES and WORDS. Each of these (BLOCKS, LINES or WORDS) will contain the entire recognized text but they can be used for better formatting and thus are separated. ALL will contain all blocks first, followed by a new line character \n, followed by all lines, followed by another new line character \n, followed by all words. So using ALL will return duplicates. returnType is an Int within the native code.
| returnType | returnConst | Notes |
|---|---|---|
| 0 | BLOCKS | Detected blocks of text seperated by two new line \n characters. |
| 1 | LINES | Detected lines of text seperated by one new line \n character. |
| 2 | WORDS | Detected words in the text seperated by , and . A comma followed by a space. |
| 3 | ALL | ALL will contain all blocks first, followed by a new line character \n, followed by all lines, followed by another new line character \n, followed by all words. So using ALL will return duplicates. |
uriOrBase which is obtained from another plugin like cordova-plugin-document-scanner or cordova-plugin-camera. This uriOrBase is then used by the plugin and via google mobile vision, it detects the text on the image. The data required for OCR is initially downloaded when the app is first installed.Example uriOrBase for NORMFILEURI or FASTFILEURI as obtained from camera plugin or scanner plugin :- file:///var/mobile/Containers/Data/Application/FF505EA5-F16E-4CBA-8F8B-76A219EDA407/tmp/cdv_photo_001.jpg
Example uriOrBase for NORMNATIVEURI or FASTNATIVEURI as obtained from camera plugin. scanner plugin doesn't return this :- assets-library://asset/asset.JPG?id=EFBA7BCD-3031-4646-9874-49368849749A&ext=JPG
successCallback
The return value is sent to the successCallback callback function, in string format if no errors occured.
errorCallback
The errorCallback function returns Scan Failed: Found no text to scan if no text was detected on the image. It also return other messages based on the error conditions.
Note :- After install the OCR App using this plugin does not need an internet connection for Optical Character Recognition since all the required data is downloaded locally on install.
You can do whatever you want with the string obtained from this plugin, for example:
<p> tag.<p id="pp">nothing yet. wait</p> in htmlvar element = document.getElementById('pp'); element.innerHTML=recognizedText; in jsNote :- This plugin doesn't handle permissions as it only requires the URIs or Base64 data of images and thus expects the other plugins that provide it the URI or Base64 data to handle permissions.
Please use cordova plugin add cordova-plugin-camera or cordova plugin add cordova-plugin-document-scanner before using the following examples.
Note :- The cordova-plugin-mobile-ocr plugin will not automatically download either of these plugins as dependencies (This is because this plugin can be used as standalone plugin which can accept URIs or Base64 data through any method or plugin).
Using cordova-plugin-camera
navigator.camera.getPicture(onSuccess, onFail, { quality: 100, correctOrientation: true });
function onSuccess(imageData) {
textocr.recText(0, /*3,*/ imageData, onSuccess, onFail); // removed returnType (here 3) from version 2.0.0
// for sourceType Use 0,1,2,3 or 4
// for returnType Use 0,1,2 or 3 // 3 returns duplicates[see table]
function onSuccess(recognizedText) {
//var element = document.getElementById('pp');
//element.innerHTML=recognizedText;
//Use above two lines to show recognizedText in html
console.log(recognizedText);
alert(recognizedText);
}
function onFail(message) {
alert('Failed because: ' + message);
}
}
function onFail(message) {
alert('Failed because: ' + message);
}
Using cordova-plugin-document-scanner
Note :- base64 and NATIVEURIs won't work with cordova-plugin-document-scanner plugin
scan.scanDoc(1, onSuccess, onFail);
function onSuccess(imageURI) {
textocr.recText(0, /*3,*/ imageURI, onSuccess, onFail); // removed returnType (here 3) from version 2.0.0
// for sourceType Use 0,2 // 1,3,4 won't work
// for returnType Use 0,1,2 or 3 // 3 returns duplicates[see table]
function onSuccess(recognizedText) {
//var element = document.getElementById('pp');
//element.innerHTML=recognizedText;
//Use above two lines to show recognizedText in html
console.log(recognizedText);
alert(recognizedText);
}
function onFail(message) {
alert('Failed because: ' + message);
}
}
function onFail(message) {
alert('Failed because: ' + message);
}
Find out more or contact us directly here :- http://www.neutrinos.co/
Facebook :- https://www.facebook.com/Neutrinos.co/
LinkedIn :- https://www.linkedin.com/company/25057297/
Twitter :- https://twitter.com/Neutrinosco
Instagram :- https://www.instagram.com/neutrinos.co/
For the cordova plugin 2.x.x the success callback will return this object
The five properties text, languages, confidence, points and frame are obtained as arrays and are associated with each other using the index of the array.
For example :- The text linetext[0] contains the languages linelanguages[0] and have a confidence of lineconfidence[0] with linepoints[0] and lineframe [0].
Refer the examples to see how the points and frame are returned. Points hold four (x,y) point values that can be used to draw a box around each text. The Frame holds the origin x,y value, the height and the width of the rectangle that can be drawn around the text. The x,y value returned from the Frame property usually correspond to x1 and y4 of the Points property. The Points and Frame values can be used to obtain the placement of the text on the image
The basic structure of the object is as follows :-
foundText was added in plugin version 3.0.0 and above. In earlier plugin versions if image did not contain text the error callback was called. From 3.0.0 onwards all success callbacks will contain the
foundTextkey with a boolean value. Letting the user know if a text was present in the image. iffoundTextis false, text was not found and hence theblocks,lines,wordskeys won't be returned
{
"foundText" : false
}
{
"foundText" : true,
"blocks": {
"blocklanguages": [
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c4009800>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c400a100>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c4009b00>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c4009fb0>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c4008d60>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c4009fc0>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c400a170>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c4008fa0>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c4008c40>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c4007790>\"]"
],
"blockpoints": [
{
"x3": "2338.143066",
"y1": "52.000000",
"x1": "2073.000000",
"y4": "656.654541",
"x4": "1972.193848",
"y2": "113.009895",
"x2": "2438.949219",
"y3": "717.664429"
},
{
"x3": "1204.772949",
"y1": "255.000000",
"x1": "942.000000",
"y4": "537.928284",
"x4": "865.838440",
"y2": "346.237946",
"x2": "1280.934570",
"y3": "629.166199"
},
{
"x3": "628.515869",
"y1": "1192.000000",
"x1": "398.000000",
"y4": "1452.757080",
"x4": "386.741180",
"y2": "1202.439209",
"x2": "639.774719",
"y3": "1463.196289"
},
{
"x3": "1787.353516",
"y1": "1257.000000",
"x1": "1495.000000",
"y4": "1482.905884",
"x4": "1488.478027",
"y2": "1265.628662",
"x2": "1793.875488",
"y3": "1491.534546"
},
{
"x3": "2804.546387",
"y1": "1267.000000",
"x1": "2495.000000",
"y4": "1547.713013",
"x4": "2468.088867",
"y2": "1299.255127",
"x2": "2831.457520",
"y3": "1579.968140"
},
{
"x3": "939.620850",
"y1": "2279.000000",
"x1": "587.000000",
"y4": "2548.592773",
"x4": "572.175903",
"y2": "2299.204590",
"x2": "954.444946",
"y3": "2568.797363"
},
{
"x3": "1968.580078",
"y1": "2307.000000",
"x1": "1776.000000",
"y4": "2534.936768",
"x4": "1770.634888",
"y2": "2311.659180",
"x2": "1973.945190",
"y3": "2539.595947"
},
{
"x3": "2982.085693",
"y1": "2334.000000",
"x1": "2793.000000",
"y4": "2544.980225",
"x4": "2790.103760",
"y2": "2336.635254",
"x2": "2984.981934",
"y3": "2547.615479"
},
{
"x3": "1426.792480",
"y1": "3287.000000",
"x1": "1072.000000",
"y4": "3611.215088",
"x4": "1037.933228",
"y2": "3327.859375",
"x2": "1460.859253",
"y3": "3652.074463"
},
{
"x3": "2455.617920",
"y1": "3346.000000",
"x1": "2255.000000",
"y4": "3559.973633",
"x4": "2251.643066",
"y2": "3349.199951",
"x2": "2458.974854",
"y3": "3563.173584"
}
],
"blocktext": [
"# 3",
"2",
"Q",
"W",
"E",
"A",
"S",
"D",
"Z",
"X"
],
"blockconfidence": [
null,
null,
null,
null,
null,
null,
null,
null,
null,
null
],
"blockframe": [
{
"y": "52.000000",
"x": "1972.000000",
"height": "666.000000",
"width": "467.000000"
},
{
"y": "255.000000",
"x": "865.000000",
"height": "375.000000",
"width": "416.000000"
},
{
"y": "1192.000000",
"x": "386.000000",
"height": "272.000000",
"width": "254.000000"
},
{
"y": "1257.000000",
"x": "1488.000000",
"height": "235.000000",
"width": "306.000000"
},
{
"y": "1267.000000",
"x": "2468.000000",
"height": "313.000000",
"width": "364.000000"
},
{
"y": "2279.000000",
"x": "572.000000",
"height": "290.000000",
"width": "383.000000"
},
{
"y": "2307.000000",
"x": "1770.000000",
"height": "233.000000",
"width": "204.000000"
},
{
"y": "2334.000000",
"x": "2790.000000",
"height": "214.000000",
"width": "195.000000"
},
{
"y": "3287.000000",
"x": "1037.000000",
"height": "366.000000",
"width": "424.000000"
},
{
"y": "3346.000000",
"x": "2251.000000",
"height": "218.000000",
"width": "208.000000"
}
]
},
"lines": {
"lineframe": [
{
"y": "53.000000",
"x": "2048.000000",
"height": "231.000000",
"width": "264.000000"
},
{
"y": "342.000000",
"x": "1979.000000",
"height": "369.000000",
"width": "405.000000"
},
{
"y": "255.000000",
"x": "865.000000",
"height": "375.000000",
"width": "416.000000"
},
{
"y": "1192.000000",
"x": "386.000000",
"height": "272.000000",
"width": "254.000000"
},
{
"y": "1257.000000",
"x": "1488.000000",
"height": "235.000000",
"width": "306.000000"
},
{
"y": "1267.000000",
"x": "2468.000000",
"height": "313.000000",
"width": "364.000000"
},
{
"y": "2279.000000",
"x": "572.000000",
"height": "290.000000",
"width": "383.000000"
},
{
"y": "2307.000000",
"x": "1770.000000",
"height": "233.000000",
"width": "204.000000"
},
{
"y": "2334.000000",
"x": "2790.000000",
"height": "214.000000",
"width": "195.000000"
},
{
"y": "3287.000000",
"x": "1037.000000",
"height": "366.000000",
"width": "424.000000"
},
{
"y": "3346.000000",
"x": "2251.000000",
"height": "218.000000",
"width": "208.000000"
}
],
"linelanguages": [
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c40084f0>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c4009e70>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c400a0a0>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c40076e0>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c40067e0>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c400a150>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c4008fb0>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c400a140>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c400a000>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c400a210>\"]",
"[ \"<FIRVisionTextRecognizedLanguage: 0x1c4007c80>\"]"
],
"lineconfidence": [
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null
],
"linetext": [
"#",
"3",
"2",
"Q",
"W",
"E",
"A",
"S",
"D",
"Z",
"X"
],
"linepoints": [
{
"x3": "2279.747070",
"y1": "53.000000",
"x1": "2081.000000",
"y4": "245.345245",
"x4": "2048.932861",
"y2": "91.480637",
"x2": "2311.814209",
"y3": "283.825897"
},
{
"x3": "2295.458252",
"y1": "342.000000",
"x1": "2067.000000",
"y4": "605.842957",
"x4": "1979.416382",
"y2": "446.911316",
"x2": "2383.041992",
"y3": "710.754272"
},
{
"x3": "1204.772949",
"y1": "255.000000",
"x1": "942.000000",
"y4": "537.928284",
"x4": "865.838440",
"y2": "346.237946",
"x2": "1280.934570",
"y3": "629.166199"
},
{
"x3": "628.515869",
"y1": "1192.000000",
"x1": "398.000000",
"y4": "1452.757080",
"x4": "386.741180",
"y2": "1202.439209",
"x2": "639.774719",
"y3": "1463.196289"
},
{
"x3": "1787.353516",
"y1": "1257.000000",
"x1": "1495.000000",
"y4": "1482.905884",
"x4": "1488.478027",
"y2": "1265.628662",
"x2": "1793.875488",
"y3": "1491.534546"
},
{
"x3": "2804.546387",
"y1": "1267.000000",
"x1": "2495.000000",
"y4": "1547.713013",
"x4": "2468.088867",
"y2": "1299.255127",
"x2": "2831.457520",
"y3": "1579.968140"
},
{
"x3": "939.620850",
"y1": "2279.000000",
"x1": "587.000000",
"y4": "2548.592773",
"x4": "572.175903",
"y2": "2299.204590",
"x2": "954.444946",
"y3": "2568.797363"
},
{
"x3": "1968.580078",
"y1": "2307.000000",
"x1": "1776.000000",
"y4": "2534.936768",
"x4": "1770.634888",
"y2": "2311.659180",
"x2": "1973.945190",
"y3": "2539.595947"
},
{
"x3": "2982.085693",
"y1": "2334.000000",
"x1": "2793.000000",
"y4": "2544.980225",
"x4": "2790.103760",
"y2": "2336.635254",
"x2": "2984.981934",
"y3": "2547.615479"
},
{
"x3": "1426.792480",
"y1": "3287.000000",
"x1": "1072.000000",
"y4": "3611.215088",
"x4": "1037.933228",
"y2": "3327.859375",
"x2": "1460.859253",
"y3": "3652.074463"
},
{
"x3": "2455.617920",
"y1": "3346.000000",
"x1": "2255.000000",
"y4": "3559.973633",
"x4": "2251.643066",
"y2": "3349.199951",
"x2": "2458.974854",
"y3": "3563.173584"
}
]
},
"words": {
"wordtext": [
"#",
"3",
"2",
"Q",
"W",
"E",
"A",
"S",
"D",
"Z",
"X"
],
"wordlanguages": [
"[]",
"[]",
"[]",
"[]",
"[]",
"[]",
"[]",
"[]",
"[]",
"[]",
"[]"
],
"wordpoints": [
{
"x3": "2279.747070",
"y1": "53.000000",
"x1": "2081.000000",
"y4": "245.345245",
"x4": "2048.932861",
"y2": "91.480637",
"x2": "2311.814209",
"y3": "283.825897"
},
{
"x3": "2295.458252",
"y1": "342.000000",
"x1": "2067.000000",
"y4": "605.842957",
"x4": "1979.416382",
"y2": "446.911316",
"x2": "2383.041992",
"y3": "710.754272"
},
{
"x3": "1204.772949",
"y1": "255.000000",
"x1": "942.000000",
"y4": "537.928284",
"x4": "865.838440",
"y2": "346.237946",
"x2": "1280.934570",
"y3": "629.166199"
},
{
"x3": "628.515869",
"y1": "1192.000000",
"x1": "398.000000",
"y4": "1452.757080",
"x4": "386.741180",
"y2": "1202.439209",
"x2": "639.774719",
"y3": "1463.196289"
},
{
"x3": "1787.353516",
"y1": "1257.000000",
"x1": "1495.000000",
"y4": "1482.905884",
"x4": "1488.478027",
"y2": "1265.628662",
"x2": "1793.875488",
"y3": "1491.534546"
},
{
"x3": "2804.546387",
"y1": "1267.000000",
"x1": "2495.000000",
"y4": "1547.713013",
"x4": "2468.088867",
"y2": "1299.255127",
"x2": "2831.457520",
"y3": "1579.968140"
},
{
"x3": "939.620850",
"y1": "2279.000000",
"x1": "587.000000",
"y4": "2548.592773",
"x4": "572.175903",
"y2": "2299.204590",
"x2": "954.444946",
"y3": "2568.797363"
},
{
"x3": "1968.580078",
"y1": "2307.000000",
"x1": "1776.000000",
"y4": "2534.936768",
"x4": "1770.634888",
"y2": "2311.659180",
"x2": "1973.945190",
"y3": "2539.595947"
},
{
"x3": "2982.085693",
"y1": "2334.000000",
"x1": "2793.000000",
"y4": "2544.980225",
"x4": "2790.103760",
"y2": "2336.635254",
"x2": "2984.981934",
"y3": "2547.615479"
},
{
"x3": "1426.792480",
"y1": "3287.000000",
"x1": "1072.000000",
"y4": "3611.215088",
"x4": "1037.933228",
"y2": "3327.859375",
"x2": "1460.859253",
"y3": "3652.074463"
},
{
"x3": "2455.617920",
"y1": "3346.000000",
"x1": "2255.000000",
"y4": "3559.973633",
"x4": "2251.643066",
"y2": "3349.199951",
"x2": "2458.974854",
"y3": "3563.173584"
}
],
"wordframe": [
{
"y": "53.000000",
"x": "2048.000000",
"height": "231.000000",
"width": "264.000000"
},
{
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FAQs
cordova plugin for mobile ocr text recognition
The npm package cordova-plugin-mobile-ocr receives a total of 56 weekly downloads. As such, cordova-plugin-mobile-ocr popularity was classified as not popular.
We found that cordova-plugin-mobile-ocr demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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