Automatic Radiographic Position Recognition from Image Frequency and Intensity

Figure 3

(a) From top to bottom: the chest X-ray image, the image frequency curve, and the chest X-ray image with inversed gray scale. (b) From top to bottom: chest X-ray image by Butterworth filtering, the image frequency curve, and the chest X-ray image with inversed gray scale. (c) From top to bottom: lung texture image reconstructed by the filtered frequency information, the frequency curve, and the lung texture image with inversed gray scale.

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