imaqReadText3
Usage
ReadTextReport3* imaqReadText3(const Image* image, const CharSet* set, const ROI* roi, const ReadTextOptions* readOptions, const OCRProcessingOptions* processingOptions, const OCRSpacingOptions* spacingOptions);
Purpose
Reads the text from the image. The function identifies all objects in the image based on the attributes that you set, and then compares each object with every trained character. For each object, the function selects the character that most closely matches the object. The function uses the substitution character for any object that does not match any of the trained characters.
Image Types Supported
IMAQ_IMAGE_U8, IMAQ_IMAGE_RGB, IMAQ_IMAGE_HSL
Parameters
|
Name
|
Type
|
Description
|
|---|---|---|
| image | const Image* | The source image for this operation. |
| set | const CharSet* | The character set this function operates on. To create a character set, use imaqCreateCharSet(). This parameter is required and cannot be NULL. |
| roi | const ROI* | The ROI that the function performs this operation on. Pass NULL to use the entire image for this operation. |
| readOptions | const ReadTextOptions* | The options you use to configure how the function reads text. |
| processingOptions | const OCRProcessingOptions* | The options you use to configure how the function processes the contents of the image before attempting to read text. |
| spacingOptions | const OCRSpacingOptions* | The size and spacing constraints you can apply to characters in the image. |
Return Value
| Type |
Description |
|---|---|
| ReadTextReport3* | On success, this function returns a report that contains information about the text contained in the image. On failure, the function returns NULL. To get extended error information, call imaqGetLastError(). When you finish with the report, call imaqDispose() to dispose of it. |
Parameter Discussion
readOptions—Set readOptions to NULL to use the following default reading options:
| validChars | NULL |
| numValidChars | 0 |
| substitutionChar | ? |
| readStrategy | IMAQ_READ_AGGRESSIVE |
| acceptanceLevel | 700 |
| aspectRatio | 400 |
| readResolution | IMAQ_LOW_RESOLUTION |
processingOptions—Set processingOptions to NULL to use the following default processing options:
| mode | IMAQ_COMPUTED_UNIFORM |
| lowThreshold | 0 |
| highThreshold | 255 |
| blockCount | 4 |
| fastThreshold | FALSE |
| biModalCalculation | FALSE |
| darkCharacters | TRUE |
| removeObjectsTouchingROI | FALSE |
| erosionCount | 0 |
spacingOptions—Set spacingOptions to NULL to use the following default spacing options:
| minCharSpacing | 1 |
| minCharSize | 20 |
| maxCharSize | 65536 |
| maxHorizontalElementSpacing | 1 |
| maxVerticalElementSpacing | 0 |
| minBoundingRectWidth | 1 |
| maxBoundingRectWidth | 65536 |
| minBoundingRectHeight | 1 |
| maxBoundingRectHeight | 65536 |
| autoSplit | FALSE |