Abstract An apparatus for processing an X-ray image, wherein an image signal newly obtained is allowed to pass through a recursive filter means (2, 8) so as to allow objectionable lag to occur between that image and a plurality of images previously obtained. Two-dimensional smoothing within a single image is carried out when the image signal is processed in a smoothing means (9). The image signal taken from the recursive filter means is mixed with the image signal taken from the smoothing means. The mixing ratio for each picture element is determined by a motion detecting means (11), which compares each picture element of the present image signal with corresponding picture elements of the previous image signals and thereby detects the motion of each picture element. Thus noise reduction by smoothing is greater in the case of an image of an object moving quickly, while the noise reduction resulting from objectionable lag induced by the recursive filter means is greater for an image of an object moving slowly.
An apparatus for processing an X-ray image, comprising: recursive filter means for allowing objectionable lag to occur between a plurality of images; smoothing means for carrying out two-dimensional smoothing within a single frame of image; mixing means for mixing an image signal taken from said recursive filter means with an image signal taken from said smoothing means; and motion detecting means for comparing each picture element of the present image signal with the corresponding picture elements of the previous image signals and, on the basis of the motion of each picture element detected from such comparison, determining a ratio in which each picture element is to be mixed in said mixing means.
Claim 2
Independent Claim
112 words
An apparatus for processing an X-ray image, comprising: recursive filter means for allowing objectionable lag to occur between a plurality of images; smoothing means for carrying out two-dimensional smoothing within a single frame of image; mixing means for mixing an image signal taken from said recursive filter means with an image signal taken from said smoothing means; and motion detecting means for comparing each picture element of the present image signal with the corresponding picture elements of the previous image signals and, on the basis of the motion of each picture element detected from such comparison, determining a ratio in which each picture element is to be mixed in said mixing means.
Claim 3
Dependent Claim
16 words
An apparatus according to claim 1 wherein said mixing means include multiplier means and adder means.
Claim 4
Dependent Claim
22 words
An apparatus according to claim 2 wherein said motion detecting means generates a signal for adjusting multiplication factor of the multiplier means.
Claim 5
Independent Claim
51 words
An apparatus according to any preceding claim wherein the noise reduction effect of the smoothing means is greater for an image of an object which is moving relatively quickly and the noise reduction effect of the recursive filter is greater for an image of an object which is moving relatively slowly.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.