Technology / Imaging

LEADTOOLS CCITT G3/G4 Image Compression SDK

CCITT G3/G4 Image Compression

Overview of LEADTOOLS CCITT G3/G4 Image Compression SDK Technology

LEADTOOLS supports CCITT Group3 and Group4 industry standards for compressing bitonal (1-bit) image data. Both Group3 and Group4 encode the source image line by line. The difference between the two algorithms is in the way the two standards handle successive scanlines.

In Group3 1D, each scan line is encoded independently, whereas in Group4, scan lines are encoded with reference to the previous one, resulting in improved compression ratios. In Group3 1D, a scan line is encoded as a set of runs, each representing a number of white or black pixels, with white runs alternating with black runs. Every run is encoded using a variable number of bits, which can be uniquely identified upon decoding. This means that frequently occurring lengths of run may be encoded very efficiently, while infrequent ones cause the data to grow. For example, a white run of 2 or 3 pixels can be encoded using just 2 bits, while a run of 1000 pixels can be encoded in 25.

Group4 encoding is more complex as compared to Group3 encoding. Each scan line is compared with the previous one. Because of this, vertical features in the source image are used to achieve high compression ratios.

There is also a Group3 2D algorithm. Group3 2D is a combination of Group3 1D and Group4 compression schemes. LEADTOOLS Document and Medical toolkits can keep 1 bit images Group4 compressed in memory.

comparison Chart of Bitonal Image Compressions

Other LEADTOOLS SDK Technologies Related to CCITT G3/G4 Image Compression

LEADTOOLS SDK Products that Include CCITT G3/G4 Image Compression

Hover over each product for a description. Click for more details.

LEADTOOLS Imaging Pro SDK

LEADTOOLS Imaging Pro includes the tools developers need to add powerful imaging technology to applications. With more than 20 years of imaging development expertise, LEADTOOLS Imaging Pro includes display functions and controls, image compression, image processing, TWAIN and WIA scanning, color conversion, 200+ display effects, 150+ image formats, printing, database imaging, imaging common dialogs and screen capture.

LEADTOOLS Document Imaging SDK

Develop powerful document imaging applications with LEADTOOLS Document Imaging. Features include comprehensive image annotation, specialized bitonal image display such as scale-to-gray and favor-black, and specialized bitonal image processing. Other features include performance and memory optimizations for bitonal images, document image clean-up including inverted text, border, hole-punch and line removal, and scanning with LEADTOOLS Fast TWAIN and WIA.

LEADTOOLS Recognition Imaging SDK

The LEADTOOLS Recognition Imaging SDK is a handpicked collection of LEADTOOLS SDK features designed to build end-to-end document imaging applications as part of an enterprise level document automation solution that requires scanning, OCR, OMR, forms recognition and processing, archival, annotation and display functionality. This powerful set of tools utilizes LEAD's industry LEADing image processing technology to intelligently identify document features that can be used to recognize any type of scanned or faxed form image.

LEADTOOLS Document Imaging Suite SDK

The LEADTOOLS Document Imaging Suite SDK is a comprehensive collection of LEADTOOLS SDK features designed to build end-to-end document imaging applications within enterprise level document automation solutions that requires capture, OCR, OMR, forms recognition and processing, PDF, print capture, archival, annotation and display functionality. This powerful set of tools utilizes LEAD's industry LEADing image processing technology to intelligently identify document features that can be used to recognize any type of scanned or faxed form image.

LEADTOOLS Medical Imaging SDK

Develop powerful Medical Imaging applications with the LEADTOOLS Medical Imaging SDK. Features include comprehensive full DICOM dataset support, 8-16 bit extended grayscale image support, image annotation, specialized extended grayscale image display such as window level and LUT processing, and specialized medical image processing. Other features include lossless JPEG compression, and signed and unsigned image data processing.

LEADTOOLS PACS Imaging SDK

Develop robust PACS Imaging applications with LEADTOOLS PACS Imaging. Features include Medical Web Viewer Framework, high and low level PACS SCP and SCU functions and controls, secure PACS communication, comprehensive DICOM data set support, image annotation, extended grayscale image display such as window level and LUT processing, and specialized medical image processing. Other features include lossless JPEG compression, JPIP and signed and unsigned image data processing.

LEADTOOLS Medical Imaging Suite SDK

Develop powerful PACS and Medical imaging applications with LEADTOOLS Medical Imaging Suite. Features include Medical Web Viewer Framework, Medical 3D, Zero Footprint HTML5 DICOM Viewer, DICOM Multimedia codecs, high and low level PACS SCP and SCU functions and controls, secure PACS communication, Print to PACS, comprehensive DICOM data set support, image annotation, extended grayscale image display such as window level and LUT processing, and specialized medical image processing. Other features include lossless JPEG compression, JPIP, and signed and unsigned image data processing.

LEADTOOLS Multimedia Suite SDK

The Multimedia Suite SDK is a comprehensive collection of multimedia development technology from LEAD Technologies. By bundling features from the Multimedia SDK, DVD Module, Video Streaming Module, MPEG-2 Transport Module, Imaging Pro SDK and Distributed Computing SDK, the Multimedia Suite provides everything a developer needs to create enterprise level multimedia applications for a wide variety of industries including defense, broadcast, security and more.

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