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Latest release

This article contains a summary of recent changes, enhancements and bug fixes in Aspose.OCR for .NET 25.6.0 (June 2025) release.

GPU version: 23.10.1

What was changed

Key	Summary	Category
OCRNET‑1036	Add Debug mode in the API to allow for customer view the areas detection results on the image.	New feature
OCRNET‑1038	Add the Confidence for the text lines in the RecognitionResult.	New feature
OCRNET‑992	Fix hOCR output formatting.	Bug fix
OCRNET‑1045	Update ONNX Runtime to version 1.22.0	Enhancement

Public API changes and backwards compatibility

This section lists all public API changes introduced in Aspose.OCR for .NET 25.6.0 that June affect the code of existing applications.

Added public APIs:

The following public APIs have been introduced in this release:

Debug mode

You can save intermediate image processing results — such as preprocessed images and text detection overlays — for visual inspection and troubleshooting. Debug mode is enabled through static properties of the AsposeOCR class:

Property	Type	Description
`AsposeOcr.DebugMode`	`bool`	Enables or disables debug image saving.
`AsposeOcr.DebugModeSaveDirectory`	`string`	Specifies the folder where debug images will be saved. If not set, the current working directory is used.

Compatibility: fully backward compatible. See details below.

Confidence score

Each recognized text line includes an optional confidence score — a floating-point value between 0.0 and 1.0 stored in the Confidence field of the LinesResult class.

This score reflects the recognition certainty of the line:

1.0 — the engine is completely confident the recognition is correct.
0.0 — recognition confidence is unknown or not calculated.

⚠️ The value is always set to 0.0 when using a temporary license.

The confidence score is only calculated for specific languages:

✅ Supported: Chinese (all groups), Arabic, Hindi, European, Korean, Japanese, Telugu, Tamil, Kannada

❌ Not supported: ExtLatin or languages with diacritical marks

You can use this value to filter or highlight low-confidence results in your application.

Compatibility: fully backward compatible. See details below.

Updated public APIs:

No changes.

Deprecated APIs

The following public APIs have been marked as deprecated and will be removed in 25.11.0 (October 2025) release:

`RectangleOutput` class

`AsposeOcr.DetectRectangles` method

`RecognitionResult.RecognitionAreasText`

`RecognitionResult.RecognitionAreasRectangles`

`RecognitionResult.Skew`

`CharacterRecognitionResult.ImageIndex`

`SkewOutput.ImageIndex`

`OcrPageRecognizeEventsArgs.CurrentImage`

Removed public APIs:

No changes.

Examples

The code samples below illustrate the changes introduced in this release:

Enable Debug Mode for Logging


// Enable debug mode to log internal processing information
AsposeOcr.DebugMode = true;
AsposeOcr.DebugModeSaveDirectory = "D:\\output\\debug";

// Initialize recognition API
AsposeOcr api = new AsposeOcr();

// Add an image to OcrInput object
OcrInput input = new OcrInput(InputType.SingleImage);
input.Add("source.png");

// Recognize image
OcrOutput results = api.Recognize(input);

Get Confidence of Recognized Text


// Initialize recognition API
AsposeOcr api = new AsposeOcr();

// Add an image to OcrInput object
OcrInput input = new OcrInput(InputType.SingleImage);
input.Add("source.png");

// Recognize image
OcrOutput results = api.Recognize(input);

// Print recognized text with confidence
foreach (RecognitionResult result in results) {
    Console.WriteLine("Text: " + result.RecognitionText);

    foreach(LinesResult line in result.RecognitionLinesResult){
			Console.WriteLine(line.TextInLine+" ");
			Console.WriteLine("Confidence: " + line.Confidence);
		}    
}