We construct a medical X-ray direct digital radiography (DDR) system based on a CCD (charge-coupled devices) camera. For the\noriginal images captured from X-ray exposure, computer first executes image flat-field correction and image gamma correction,\nand then carries out image contrast enhancement. A hybrid image contrast enhancement algorithm which is based on sharp\nfrequency localization-contourlet transform(SFL-CT) and contrast limited adaptive histogramequalization (CLAHE), is proposed\nand verified by the clinical DDR images. Experimental results show that, for the medical X-ray DDR images, the proposed\ncomprehensive preprocessing algorithm can not only greatly enhance the contrast and detail information, but also improve the\nresolution capability of DDR system.
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