Digital Image ProcessingDigital Image ProcessingFeng JufuNational Key Laboratory of Visual and Auditory Information Processing, Center for Information Science, Peking University2001.1 Contents(I)E1E2E3E4E5IntroductionBasics of digital imagesImage transformationImage enhancementEdge detection Contents(II)E6E7E8E9E10Image segmentationBinary image processingGeometric feature extraction and shape analysisTexture analysisColor image processingIEIntroductionPurposeE Human visual modelE Image digitizationE Digital image representationE Sampling and quantizationE Image recognition system frameworkE ExamplePurposeEImage quality improvement, such as medical images and remote sensing image enhancement…X-ray CTE image data processing has a wide range of applications, such as fingerprint image processingOCR Image processing under electron or optical microscopesMedical imagesRemote sensing image analysis…Note that image processing is related to the problemE ~Human visual systemE Eyeball and retina structure Image digitizationEDigital camera scannerE Digital image representationWhat is an image?An image is a two-dimensional brightness function f(x,y) Grayscale imageColor image is composed of three two-dimensional brightness functionsRGB,YUV(x,y) Define the spatial coordinates f(x,y) Define the brightness or grayscale E of the point A digital image refers to the digitization of the spatial coordinates and brightness of the image f(x,y) A digital image can be seen as a matrix or a two-dimensional array whose basic elements are called pixels PixelE Sampling and quantization E - uniform sampling and quantization Digitization of spatial coordinates - image sampling f (0,0), f (0, 1) LLLLLL f (0, M 1) f (1, 0), f (1, 1) LLLLLL f (1, M 1) f ( x, y ) = M f ( N 1,0), f ( N 1,1) L f ( N 1, M 1) Digitization of intensity - grayscale quantization nkm N = 2 , M = 2 , G = 2 …
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