An image edge sharpening technique with phase correction for digital image is presented. In this paper the point spread functions of a typical standard single focal lens and zoom lens are investigated with a several different apertures. And from this investigation the Fourier phase figure pattern of the point-spread function is identified. The technique here includes a traditional one (a Laplacian operator) and phase-only synthesis with the corrected Fourier phase. The Fourier phase of the original non-blurred image is estimated recursively and it is utilized for implementation of the phase-only synthesis, which is powerful for image edge sharpening. A human visual property is also introduced as a weight function in order to maintain the natural smoothness in the gray level of the resulting processed image. Simulation examples show that the proposed technique is superior to the traditional one.