Signed Image Processing SDK Technology

LEADTOOLS provides signed image data support (+/- integer) within ts large collection of image processing functions and viewer controls for .NET (C# & VB, Core, Xamarin, UWP), C/C++, iOS, macOS, Linux, Java, and web developers.

Image (bitmap) data values may be expressed as absolute value-only, or as positive/negative integer values ("signed" images). These image values are stored in a look-up table (LUT), where the image data range is represented as a single series of integer values. LEADTOOLS can manipulate either the LUT values or the image data directly. When displaying images, mapping the negative and positive values of the signed images to LUT values speeds up processing.

Who uses signed images?

Signed images are most commonly used by medical imaging applications supporting the DICOM standard. Astronomical and geophysical image data may also be signed.

When and why do signed image values matter?

Signed image data is often used when image classification is based on variation from a reference value. For example, image values for DICOM images acquired from a modality depend on a reference plate, with some (positive) values recorded above the plate threshold and some (negative) below. Some astronomical images are also signed as variations from a nominal background reference value.

When would I want to manipulate the LUT, and when would I want to manipulate the image data directly?

For many effects, the final result will be the same whether you apply the effect on the LUT or the source data, but processing the LUT will be much faster. For example, inverting the start and end colors of the LUT is faster than inverting the intensity value of each pixel.

Technology Related to Signed Image Processing

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Supported Development Platforms for Signed Image Processing

Documentation Links for Signed Image Processing

Demo Applications that Include Signed Image Processing

HTML5/JavaScript Medical Web Viewer Framework

A zero-footprint Medical viewer to display DICOM images (pixel data) with window level, stack, annotations/markup, and multi-touch support for phone, tablet, and desktop.

Note: If you have your own test images that you would like to upload into the application, contact support@leadtools.com to have a private user profile created.

LEADTOOLS SDK Products that Include Signed Image Processing

All LEADTOOLS SDKs include image processing technology. Certain products contain specialized functionality as specified in the developer documentation for each function.

LEADTOOLS Document Imaging v20

Develop powerful document imaging applications with LEADTOOLS Document Imaging. Features include PDF viewing and editing, comprehensive image annotating, specialized bitonal image displaying, and image processing. Other features include performance and memory optimizations for bitonal images, document image cleanup, including inverted text, border, hole-punch, and line removal, and scanning with LEADTOOLS Fast TWAIN and WIA.

LEADTOOLS Recognition v20

The LEADTOOLS Recognition Imaging SDK is a handpicked collection of LEADTOOLS SDK features designed to build end-to-end document imaging applications within enterprise-level document automation solutions that require OCR, MICR, OMR, barcode, forms recognition and processing, PDF, print capture, archival, annotation, and image viewing functionality. This powerful set of tools utilizes LEAD's award-winning image processing technology to intelligently identify document features that can be used to recognize and extract data from any type of scanned or faxed form image.

LEADTOOLS Document Imaging Suite v20

The LEADTOOLS Document Imaging Suite SDK is a comprehensive collection of LEADTOOLS SDK features designed to build end-to-end document imaging solutions that require OCR, MICR, OMR, ICR, barcode, forms recognition and processing, PDF, HTML5 Zero-footprint viewing, conversion, print, capture, archival, annotation, and image viewing functionality. This powerful set of tools utilizes LEAD's award-winning image processing technology to intelligently identify document features that can be used to recognize and extract data from any type of scanned or faxed form image.

LEADTOOLS Medical Imaging v20

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

LEADTOOLS PACS Imaging v20

Develop robust DICOM PACS 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, MRTI, and signed and unsigned image data processing.

LEADTOOLS Medical Imaging Suite v20

Develop powerful PACS and Medical imaging applications with LEADTOOLS Medical Imaging Suite. Features include LEAD's Zero-footprint HTML5 DICOM Viewer, Medical Web Viewer Framework, Medical 3D, 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, DICOM Hanging Protocol, and specialized medical image processing. Other features include lossless JPEG compression, JPIP, and signed and unsigned image data processing.