北大医学数字图像处理1.1图像处理的分类与特点

11.11.1.1image♥I(x,y,z,t)objecttoimage♥♥1.1.211.1.3ProcessingINPUTOUTPUT1.1.4AnologImageProcessing♥2XRays,Gamma-Rays,XRaysCT♥25/1.1.5DigitalImageProcessing♥Digitizing,:3Digitizedpictureelement,orpixel:Thesmallestimage-formingunitofavideodisplay.ScanningSamplingQuantization„Scanning(Scanning„Sampling(„Quantization(ADC/♥DisplayingDigitizingOperation♥gray-scaleresolution,,,4nn22422=825628=8bit12bit16bit25628=♥Contrast♥MN,MNn2512512,256256××20482048,10241024××kbbkB524524288~648256256=≈××MBMBkB482048204818102410242568512512≈××≈××≈××NM1024x-ray64256kbMb30423403240≈××♥)2cos(ϕωλπ++=txAy51.1.6100Mips:8512512××bitbit1220482048××61.1.77891.1.8X-Y1.1.9♥1020012000IT152012130009112002MVC-4AVS,♥123)(1)x133.51/mmx1210s,20sCCD/(R/F)800mmx(2)B(VGA)A/DB1415