G.e. Medical Systems, S.a.

Philippe Bodelet

Jean Bossaert

Thierry Tomietto

A method of operating a display including providing a display; acquiring an image of a structure by measuring, for each of a plurality of elements, a magnitude representing an element of the structure; providing a plurality of contrast setting control buttons including a first contrast setting button that directly and independently modifies dark parts of the image of the structure and a second contract setting button that directly and independently modifies light parts of the image of the structure; digitizing the magnitudes according to a direct mode by assigning a digitized value d representing the measured magnitude of each of the elements; displaying a direct image by assigning a luminosity l corresponding to the digitized value d of each of the elements and transmitting to the display the luminosity l of each of the elements; transforming the direct image to a transformed image by assigning to each the of elements a digital value i which corresponds to the digitized value d of each of the elements; and displaying the transformed image by assigning to each of the elements a luminosity m corresponding to the digital value i of each of the elements and transmitting to the display the luminosity m of each of the elements, the digital value d of each of the elements is converted into the digital value i of each of the elements according to a reversal function f, the reversal function f having a slope -b for zero values of d and a slope -1/a a for maximum values of d, so as to transform the darkest and the most luminous parts of the direct image, the contrast setting control buttons act directly on slope -b and slope -1/a and the reversal function f is determined on the basis of slope -b and slope -1/a.

Display and gradation correction curve setting method for operation

To filter a signal delivered in interleaved form, there is provision for the introduction, in series, of a filter on half frames having a bandpass transfer function on the horizontal plane and a high-pass transfer function on the vertical plane. It is shown that this filter then carries out a general bandpass transfer function on the total image signal. Steps are taken to make the center frequency of this filter correspond to a desired resolution of the image. It is shown then that by acting in this way it is possible to heighten the contours of the structures. The invention can be applied particularly to medical radiography.

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Arpajon, France

Philippe Bodelet