Selective Area Image Compression
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
X-ray radiographic images can be digitized by dividing the image area into pixels arranged in horizontal rows and vertical columns. In order to obtain a useful resolution for the digitized representation of the radiographic image, a typical X-ray picture must be divided into 1,024 pixels in the horizontal direction and 1,024 pixels in the vertical direction. If each pixel is given a gray scale range of 256 different values, then an eight-bit byte of information is required for each pixel. Thus, a typical X-ray picture will require a megabyte of storage for adequate resolution. In order to reduce the storage requirements for digitized X-ray pictures, various techniques have been tried in the past to compact the image.