ImageProcessor
The ImageProcessor class is a utility class for applying advanced processing on images.
Definition
Namespace: Dynamsoft.Utility
class ImageProcessor : IDisposable
Methods
| Method | Description |
|---|---|
AdjustBrightness |
Adjusts the brightness of the image. |
AdjustContrast |
Adjusts the contrast of the image. |
ConvertToBinaryGlobal |
Converts the grayscale image to binary image using a global threshold. |
ConvertToBinaryLocal |
Converts the grayscale image to binary image using local (adaptive) binarization. |
ConvertToGray |
Converts colour image to grayscale. |
CropImage |
Crops an image. |
CropAndDeskewImage |
Crops and deskews a region from the input image based on the specified quadrilateral. |
FilterImage |
Applies a specified image filter to an input image and returns the filtered result. |
AdjustBrightness
Adjusts the brightness of the image.
ImageData AdjustBrightness(ImageData imageData, int brightness)
Parameters
[in] imageData The image data to be processed.
[in] brightness Brightness adjustment value (positive values increase brightness, negative values decrease brightness). The value range is [-100, 100]
Return value
Returns an ImageData object representing the processed image.
See Also
AdjustContrast
Adjusts the contrast of the image.
ImageData AdjustContrast(ImageData imageData, int contrast)
Parameters
[in] imageData The image data to be processed.
[in] contrast Contrast adjustment value (positive values enhance, negative values reduce contrast). The value range is [-100, 100]
Return value
Returns an ImageData object representing the processed image.
See Also
ConvertToBinaryGlobal
Converts an input image to a binary image using a global threshold. Supports grayscale, color, and binary input images (color images are internally converted to grayscale before thresholding).
ImageData ConvertToBinaryGlobal(ImageData imageData, int threshold = -1, bool invert = false)
Parameters
[in] imageData Input image (grayscale, color, or binary).
[in] threshold Global threshold for binarization. If set to -1 (default), the function will automatically compute an optimal threshold.
[in] invert If true, invert the output binary image.
Return value
Returns an ImageData object representing the binarized image.
See Also
ConvertToBinaryLocal
Converts an input image to a binary image using local (adaptive) thresholding. Supports grayscale, color, and binary input images (color images are internally converted to grayscale before thresholding).
ImageData ConvertToBinaryLocal(ImageData imageData, int blockSize = 0, int compensation = 10, bool invert = false)
Parameters
[in] imageData Input image (grayscale, color, or binary).
[in] blockSize Size of the local block used for adaptive thresholding. If set to 0 (default), a suitable block size will be chosen automatically.
[in] compensation Adjustment value applied to the computed local threshold (default 10).
[in] invert If true, invert the output binary image.
Return value
Returns an ImageData object representing the locally binarized image.
See Also
Remarks
Changed default value of compensation parameter from 0 to 10 in Dynamsoft Barcode Reader SDK version 11.4.1000 and Dynamsoft Capture Vision version 3.4.1000.
ConvertToGray
Converts colour image to grayscale.
ImageData ConvertToGray(ImageData imageData, float R = 0.3f, float G = 0.59f, float B = 0.11f)
Parameters
[in] imageData The image data to be processed.
[in] R Weight for red channel.
[in] G Weight for green channel.
[in] B Weight for blue channel.
Return value
Returns an ImageData object representing the processed image.
See Also
CropImage
Crops an image.
ImageData CropImage(ImageData imageData, Rect rect, out int errorCode);
//Announced as deprecated. Use CropAndDeskewImage instead.
ImageData CropImage(ImageData imageData, Quadrilateral quad, out int errorCode);
Parameters
[in] imageData The image data to be cropped.
[in] rect The rectangle to be cropped.
[in] quad The quadrilateral to be cropped.
[out] errorCode The error code.
Return value
Returns an ImageData object representing the cropped image.
See Also
CropAndDeskewImage
Crops and deskews a region from the input image based on the specified quadrilateral.
ImageData CropAndDeskewImage(ImageData imageData, Quadrilateral quad, int dstWidth = 0, int dstHeight = 0, int padding = 0)
ImageData CropAndDeskewImage(ImageData imageData, Quadrilateral quad, int dstWidth, int dstHeight, int padding, out int errorCode)
Parameters
[in] imageData The source image to be cropped and deskewed.
[in] quad A quadrilateral defining the region of interest to extract.
[in] dstWidth (Optional) The width of the output image. If set to 0, the width and height will be automatically calculated.
[in] dstHeight (Optional) The height of the output image. If set to 0, the width and height will be automatically calculated.
[in] padding (Optional) Extra padding (in pixels) applied to expand the boundaries of the extracted region. Default is 0.
[out] errorCode The error code.
Return value
Returns an ImageData object representing the cropped image.
Remarks
The function will automatically calculate the perspective transform matrix and use it to crop the image.
If the specified quadrilateral exceeds the image boundaries, white will be used to fill the exceeding area.
See Also
FilterImage
Applies a specified image filter to an input image and returns the filtered result.
ImageData FilterImage(ImageData imageData, EnumFilterType filterType)
Parameters
[in] imageData The image data to be processed.
[in] filterType Specifies the type of filter to apply to the input image.
Return value
Returns an ImageData object representing the processed image.
See Also
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