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scale-up-modes-v1.2.1.md

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ScaleUpModes - Dynamsoft Label Recognition Parameter Reference for LabelRecognitionParameter Object
This page shows Dynamsoft Label Recognition Parameter Reference for LabelRecognitionParameter Object - ScaleUpModes.
ScaleUpModes, LabelRecognitionParameter, parameter reference, parameter
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ImageParameter Object | ScaleUpModes

ScaleUpModes

Mode Properties

ScaleUpModes is a parameter for setting the mode to control the scale-up process for text line with small letter height. It consisits of one or more DLRScaleUpMode items and each item has its own arguments. The array index represents the priority of the item. The smaller index is, the higher priority is.

Value Type Value Range Default Value
string array or [DLRScaleUpMode]({{ site.enumerations }}parameter-mode-enums.html#dlrscaleupmode) array "DLR_SUM_SKIP"
"DLR_SUM_AUTO"
"DLR_SUM_LINEAR_INTERPOLATION"
"DLR_SUM_NEAREST_NEIGHBOUR_INTERPOLATION"		 ["DLR_SUM_AUTO", "DLR_SUM_SKIP", "DLR_SUM_SKIP", "DLR_SUM_SKIP", "DLR_SUM_SKIP", "DLR_SUM_SKIP", "DLR_SUM_SKIP", "DLR_SUM_SKIP"]
  • See also:
    [ScaleUpMode Enumeration]({{ site.enumerations }}parameter-mode-enums.html#scaleupmode)

Mode Arguments

LetterHeightThreshold

Sets the letter height threshold for scale-up.

Value Type Value Range Default Value
int [0, 0x7fffffff] 0

Remarks
0 : means automatically set by the library. If the average letter height of a text line is smaller than the LetterHeightThreshold, the image will be enlarged to N times (N=2,4,8…) till N * LetterHeight >= TargetLetterHeight.

TargetLetterHeight

Sets the target letter height for scale-up.

Value Type Value Range Default Value
int [0, 0x7fffffff] 0

Remarks
0 : means automatically set by the library.

Setting Methods

As JSON Parameter

ScaleUpModes as a JSON parameter is a JSON Object array. Each JSON Object has several keys for setting the mode and the value of arguments. The array index decides the priority and the mode to control the scale-up process for text line with small letter height. Default values will be used if there is no manual setting.

Json Object Json Parameter Name Value Type
ImageParameter ScaleUpModes JSON Object Array

Json Parameter Example

{
    "ScaleUpModes": [
        {
            "Mode": "DLR_SUM_AUTO",
            "LetterHeightThreshold": 10,
            "TargetLetterHeight": 50
        }
]
}