METHOD FOR EVALUATING INFORMATIVE CAPACITY OF X-RAY SHADOWGRAPH Russian patent published in 2007 - IPC H04N5/325 G01N23/18 A61B6/14 

FIELD: x-ray engineering, possible use for estimating quality of informative capacity of x-ray shadowgraphs, produced, for example, in medical diagnostics.

SUBSTANCE: method is based on determining an information index for the shadowgraph being examined, which index indicates amount of information contained therein, while x-ray shadowgraph is digitized by division onto elementary sections - pixels, and for each pixel a value is determined, corresponding to its blackening density, and the information index characterizing the x-ray image is determined from formula: where x_max and y_max - number of pixels in rows and columns, respectively, I_x,y - pixel blackening density coefficient with x and y coordinates, and C_min - threshold value of contrast, and in case when inequality condition is satisfied for two adjacent pixels for a value, exceeding C_min, a unit is added to information index Q, in opposite case - a zero is added.

EFFECT: increased information capacity estimate of x-ray shadowgraph.

5 dwg