How to fix invalid height/width error in leadtools OCR form recognise?

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.NET4.5

I am working on OMR Result software. I am using Leadtools 19 in vb.net. when I load scanned documents, Leadtools ocr engine recognize some documents successfully but in some documents its throw exception "Invalid height/width". I am using deskew and highquality rotate command to fix this. This commands remove this exception some time but not every time. I am using this code below

Note: All Images are same dpi(300) and resolution.

What I have tried:

Dim command As ImageProcessing.Core.DeskewCommand = New         
ImageProcessing.Core.DeskewCommand
Command.Flags = DeskewCommandFlags.UseCheckDeskew Or
DeskewCommandFlags.UseLineDetectionCheckDeskew
Dim rcmd As HighQualityRotateCommand = New HighQualityRotateCommand
rcmd.Angle = command.Angle * 100

Posted 8-Oct-16 21:16pm

Md Jamaluddin Saiyed

Updated 13-Oct-16 15:40pm

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Member 12785595 13-Oct-16 5:13am

Hi , I am new to Leadtools 19. I am trying to perform OMR on survey questionnaire. You seem to have working experience with Leadtools for OMR . Please, can you help me with the basics of OMR just to be able to scan and recognize documents, how master form is created, etc .

Md Jamaluddin Saiyed 14-Oct-16 1:45am

does you download leadtools sdk ? They have provided full examples with codes you can use these code, they also provide videos about how to create master form and how to use it.

Member 12785595 14-Oct-16 3:48am

Thanks for your quick reply.
Yes, I have downloaded the trial SDK and tried using OMR demo and it works with the images supplied with the SDK. But when I try to use my own survey image it wont work.
I get a " Invalid width/height " exception.
Can you just give me working demo project or code for OMR , Please ?

Member 12785595 14-Oct-16 4:04am

As a beginner, I have few questions in mind. They are:
To start with, for my survey questionnaire,
1. Do I need to create master form and if yes, how can I create master form?
2. Is it done programmatically ?
3. Do I need to scan or take picture of filled up form?

Md Jamaluddin Saiyed 14-Oct-16 6:56am

hi
first you need to take a blank survey form image. Image should be clear and high resolution(300dpi).Now goto master form editor. which you can find at C:\LEADTOOLS 19\Shortcuts\Forms Recognition & Processing\.NET Class Libraries\Forms (Structured & Unstructured)\Forms Recognition & Processing\Master Forms Editor

now make bounding rectangle on every fields and name it as you like.follow this link https://www.youtube.com/watch?v=wo6TGcdrtb4 , you will understand whole thing.

Member 12785595 14-Oct-16 7:32am

Hi,

I really appreciate your instant response and willingness to help. Thanks.
Just to let you know, I have already set up a demo project for OMR as mentioned in SDK. And it runs successfully with the form images provided along with SDK. Now, when I try using my survey forms, its not working as expected.

What I have done is as below:

1. I have created a Master form for my survey form. I have masterForm.bin, masterForm.tif and masterForm.xml.
2. For test purpose, I opened the survey form in MS-Paint and put check marks as
if user has checked.
3. Now , when I try to run the applciation for OMR recognition, I get " Invalid
width/ height" exception.

What am I doing wrong here ? Also, when I try an edit the supplied survery form
with SDK and put check marks on it using MS-Paint, it also wont work and gives
the same error.

Looking forward for your respose.

Thanking you in advance.

Md Jamaluddin Saiyed 14-Oct-16 7:43am

I guess you are using advantage engine. You should use professional engine, which is second engine option in combo box when you open form demo. your image should not skew during scan. If you image skewed you should run deskew command. you can see this method in my above question.

Member 12785595 14-Oct-16 8:25am

Hi,

But the demo application doesn't work for a supplied form image when I try to mark check the filled up form editing in MS-Paint. It still gives me the error " Invalid width/height ".

Md Jamaluddin Saiyed 14-Oct-16 8:33am

your master image size and supplied image size should be same. If your master page is A4 scanned image should be A4.You should ckeck mark as OMR in master form on every omr fields.You missing some think . It should be work. you can chat with leadtools the provide great support even you have evaluation version

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LEADTOOLS Support · Answer 1 · 2016-10-13T15:40:00

It looks like you already contacted LEADTOOLS Support via email and sent over the files that you are testing.

The image that you are using is not common since you are OCRing an OMR form field with almost no text and the advantage engine excludes OMR fields from its calculations. We have forwarded this to our developers and they added a feature to not return an error in this situation.

We will be contacting you via email as well with more information on the resolution.