We present a new technique for image contrast enhancement via multiscale gradient transformation. In contrast to histogram-based techniques which aim to change the global statistical distribution of pixel intensities, we improve image contrast by modifying the modulus of the gradient image at multiple scales. In computation, a multiscale gradient representation of the image is generated by a wavelet transform (WT). Linear or nonlinear transformation is applied to multiscale gradients. A contrast-enhanced image is obtained from the transformed multiscale gradients by the inverse wavelet transform. Experimental results demonstrate two advantages of the new method: its flexibility to selectively enhance features of different sizes and ability to control noise magnification.<>


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    Titel :

    Contrast enhancement via multiscale gradient transformation


    Beteiligte:
    Jian Lu (Autor:in) / Healy, D.M. (Autor:in)


    Erscheinungsdatum :

    01.01.1994


    Format / Umfang :

    385668 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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