Radiographic image composition and use

1. An apparatus for processing radiographic images, comprising:

an inputting unit which inputs a plurality of radiographic images;

a blending unit which blends the input radiographic images to form a blended composite radiographic image; and

a pixel value adjusting unit which applies a pixel value adjustment to each pixel of the composite image that is located within a stitching boundary of the radiographic images, and which adjusts values of other pixels in the composite image that are located within an adjustment area that is adjacent to the stitching boundary;

wherein the adjustment area is determined based on a rate of change of an adjustment amount of the other pixels,

wherein the rate of change is dependent on boundary pixel values and on the pixel value adjustment made to the boundary pixels, and

wherein the rate of change is a decreasing rate.

2. An apparatus according to claim 1 , wherein the boundary pixels comprise at least one line of pixels in the composite image.

3. An apparatus according to claim 1 , wherein the pixel value adjusting unit determines a rate of change of the adjustment for the other pixels based on the stitching boundary adjustment and on values of the boundary pixels.

4. An apparatus according to claim 1 , wherein the pixel value adjusting unit determines a stitching boundary adjustment for use in adjusting boundary pixels of the composite image and determines an average value of the boundary pixels.

5. An apparatus according to claim 1 , further comprising:

an using unit which uses the blended composite image as a medical diagnostic instrument to examine a subject of the composite image.

6. An apparatus according to claim 5 , wherein the medical diagnosis comprises a scoliosis assessment.