DeHao AB8000|Handwriting Quantitive|kinematics of handwriting|Pressure Analysis|Printer Identification
DeHao AB8000 adopts micron-level tomography control technology and computer controlled automatic navigation technology, AB8000 introduce the quantitative concept into handwriting analysis by accurate and quantitative data collection including writing stroke strength and writing angle characteristics of the handwriting AB8000 makes handwriting inspection more scientific and accurate to avoid the interference of subjective factors.
By measuring the progression of the pressure in any stroke or signature, AB8000 genrates a unique curve of the indentation on the paper created by the writer's pressure distributed along the lines of the stokes. While a high level forgery may duplicate letter shape and line thickness, it would be extremely difficult to duplicate pressure curves and shape. By comparing the curves of a genuine signature with a questioned signature, these indentation curves are very useful for document examiners to determine if the questioned signature is genuine or counterfeit. The technology is a very useful tool for handwriting analysis, particularly for difficult signatures - those with fewer strokes, or signatures of high level forgery.
- Collectand analyze the microscopic characteristics of the pen marks through high magnification optical objective lens and digital camera;
- Capture and display the stereo microscopic image of the pen mark position through tomography and super depth of field technology;
- Analyze the data of depth change of the pen marks to achieve the quantitative analysis of pen strength;
- Analyze thedata of the pen mark angle changing to achieve the quantitative analysis of the pen holding angle;
- Analyzethe changing trend of the overall stroke depth to identify the continuous or pause characteristics of the handwriting;
- Analyze the correlation coefficient between multiple sets of databy the comparison of the stroke depth and pen holding angle characteristics.
- Generate 2Dand 3D images and report of the data/spectrum of the original material Micro characteristics
Measures the dynamic development of handwriting
By comparing the curves of a genuine signature with a questioned signature, The examiner is able to examine the pressure distribution of the writing instrument along the strokes, which provides a high level of discrimination between any individual's natural writing characteristics and forged writing, particularly with regard to signatures. The system can then calculate a correlation factor.
Methodology- Variable focus microscopy
- Dark field long range ring light
- Extremely flat document plate with Vacuum system with more than 2000 evenly distributed low profile holes
- A 220x315 mm motorized XY axis system moves the microscope across the document with precision and speed.
- 3D-topography calculations measure multiple indentation points.
- Exmor camera with 6 million pixels
Integrated Imaging Platform
The system is enclosed in a large aluminum enclosure with all connectors located in the back (power, HDMI and USB port).
Easily accessible software allows for control of imaging cameras, 3D indentation measurement, system hardware, processing of dynamic curves and correlation factors.
The AB8000 can measure the signature indentations to a resolution of 1 micron. The system can also measure the height of ink print from laser printers and highlight irregularities to facilitate with discrimination of print unique to individual printer hardware, even of the same.
Handwriting characteristics of the sample point