IMAGE PROCESSING DEVICE AND REGION EXTRACTION METHOD

摘要

To provide an image processing device, a region extraction method, and an image processing method capable of extracting a target region based on minute variations in a concentration value that exist locally and clearly displaying the extracted target region, the image processing device extracts a blood vessel region A from an image to extract a region where a CT value is smaller than an average concentration value of the blood vessel region A as a soft plaque region B. For unextracted soft plaque, a pixel pair is set in a difference region between the region A and the region B, and for each pixel Pj between the pixel pairs, whether or not the pixel value is even smaller than a value slightly smaller than the CT value of the pixel pair is determined. Hence, a portion where a pixel value slightly varies locally is extracted as soft plaque.

主权项

1. An image processing device comprising:
an input unit for inputting image data; a first region extracting unit for extracting a first region from the image data input by the input unit; a second region extracting unit for performing a threshold value process for the first region using a threshold value based on a concentration in the first region to extract a second region from the first region; a third region extracting unit for setting a pixel pair that is a combination of two pixels in a difference region between the first and second regions; setting pixels between each pixel pair as pixels of interest; and then extracting the pixel of interest as a third region in a case where a difference between a pixel value of the pixel of interest and at least either pixel value of the pixel pair is larger than a predetermined value; and a target region setting unit for obtaining a region where the second and third regions are added as a target region.