Proc. SPIE. 11050, International Forum on Medical Imaging in Asia 2019
KEYWORDS: Logic, Image processing, Field programmable gate arrays, Gaussian filters, Digital imaging, Systems engineering, Color vision, Digital electronic circuits, Digital electronics, RGB color model
In this study, we designed a digital hardware circuit for a field-programmable gate array (FPGA) to provide an effective contrast improvement algorithm for dichromats. The proposed method employs the Craik-O ’Brien (C-O) effect. The C-O effect is an optical illusion effect in which subjective contrast is created from contour information. In the proposed method, the contrast modification is only conducted around the contours of objects to apply the C-O effect for dichromats. To extract the contour information of objects, a T-model filter which only requires a one-line buffer is introduced. The proposed method can realize the C-O effect without using dividers and multipliers. Therefore, it is relatively simple to implement in the FPGA. Through experiments with software and logic simulation, the effectiveness and validity of the proposed method were evaluated.