JPEG coefficient extraction and encoding API #92
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- Introduced `extractCoefficients` and `encodeFromCoefficients` methods in the `Image` class for handling JPEG quantized DCT coefficients. - Added `JPEGQuantizedCoefficients` and `JPEGComponentCoefficients` interfaces to define the structure of coefficient data. - Updated `JPEGDecoder` to support coefficient extraction during decoding. - Enhanced type definitions in `types.ts` to accommodate new functionality. This update facilitates advanced image processing and steganography capabilities.
- Implemented `extractCoefficients` in `JPEGFormat` to retrieve quantized DCT coefficients from JPEG data. - Added `encodeFromCoefficients` method to allow encoding JPEG images from quantized coefficients, enhancing steganography capabilities. - Introduced type guard `isJPEGCoefficients` to validate coefficient data format. - Updated `JPEGEncoder` to support encoding directly from pre-quantized coefficients. These changes improve the functionality for advanced image processing tasks.
…cient extraction features
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Image.extractCoefficients()- Extract quantized DCT coefficients from JPEG imagesImage.encodeFromCoefficients()- Re-encode JPEG from modified coefficientsJPEGFormat.extractCoefficients()- Format-specific coefficient extractionJPEGFormat.encodeFromCoefficients()- Format-specific coefficient encodingJPEGDecodernow supportsextractCoefficientsoption to store quantized valuesJPEGEncoder.encodeFromCoefficients()- Encode pre-quantized DCT coefficientsCoefficientData,JPEGQuantizedCoefficients,JPEGComponentCoefficientstest/formats/jpeg_coefficients.test.ts