IMAGE PROCESSING APPARATUS, RADIOGRAPHIC APPARATUS AND IMAGE PROCESSING METHOD

• Main Authors: TAKASAKI TAKASHI, HAYASHIDA SANEMASA
• Format: Patent
• Language: English; Japanese
• Published: 17.09.2020
• Subjects: CALCULATING; COMPUTING; COUNTING; DIAGNOSIS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; HUMAN NECESSITIES; HYGIENE; IDENTIFICATION; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; MEDICAL OR VETERINARY SCIENCE; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; SURGERY

To provide technique for reducing deterioration of image quality due to a change over time in an offset component generated during imaging in a radiographic apparatus.SOLUTION: An image processing apparatus is configured to process an image obtained from an image sensor in which a plurality of pixels are arranged in a matrix. The plurality of pixels include a first pixel group for obtaining a pixel value according to the radiation amount and a second pixel group for obtaining an offset value even while radiation is applying. The image processing apparatus comprises: a first correction unit that offset-corrects a radiation image obtained from the plurality of pixels by a shooting operation while the radiation is applying based on a dark image obtained from the plurality of pixels by the shooting operation when no radiation is applied; and a second correction unit that corrects the pixel value obtained from the first pixel group which is corrected by the first correction unit based on the temporal fluctuation of the pixel value obtained from the second pixel group.SELECTED DRAWING: Figure 1 【課題】放射線撮影装置において撮影中に発生するオフセット成分の経時的な変化に起因した画質の劣化を低減する技術を提供する。【解決手段】画像処理装置は、放射線量に応じた画素値を得るための第一の画素群と、放射線の照射時においてもオフセット値を得るための第二の画素群とを含む複数の画素がマトリクス状に配置された撮像センサから得られる画像を処理する。画像処理装置は、放射線の非照射時の撮影動作により複数の画素から得られる暗画像に基づいて、放射線の照射時の撮影動作により複数の画素から得られる放射線画像をオフセット補正する第一の補正部と、第二の画素群から得られる画素値の時間的な変動に基づいて、第一の補正部により補正された、第一の画素群から得られた画素値を補正する第二の補正部と、を備える。【選択図】図１