Resource Base
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ScaleDownThreshold
ScaleDownThreshold is a parameter to specify the threshold for image shrinking. It is defined as below:
| Value Type | Value Range | Default Value |
|---|---|---|
| int | [512, 0x7fffffff] | 2300 |
Remarks
If the shorter edge size is larger than the given value, the library will calculate the required height and width of the barcode image and shrink the image to that size before localization. Otherwise, it will perform barcode localization on the original image.
Setting Methods
ScaleDownThreshold is supported to be set through RuntimeSetting or JSON template.
As PublicRuntimeSettings Member
ScaleDownThreshold can be set dynamically during runtime as a member of PublicRuntimeSettings struct.
Code Snippet in C++
//...other codes
PublicRuntimeSettings* pSettings = new PublicRuntimeSettings;
int errorCode = reader->GetRuntimeSettings(pSettings);
pSettings->scaleDownThreshold = 2300;
reader->UpdateRuntimeSettings(pSettings);
delete pSettings;
//...other codes
See Also
PublicRuntimeSettings:JavaScript | C | C++ | .NET | Python | Java | Java-Android | Objective-C & Swift
As JSON Parameter
ScaleDownThreshold as a JSON parameter is a number value defined as below.
| Key Name | Key Value |
|---|---|
| ScaleDownThreshold | A number from [512, 0x7fffffff] |
JSON Example
{
"ScaleDownThreshold": 2300
}
Impacts on Performance
Speed
Setting ScaleDownThreshold to a smaller value than the shorter edge size of the image may speed up the process when the barcode is clear and big on the image.
Read Rate
Setting ScaleDownThreshold to a larger value than the shorter edge of the image may improve the Read Rate when the barcode is a small part on the image.
Accuracy
ScaleDownThreshold has no influence on the Accuracy.
Yes
No