PROBLEM TO BE SOLVED: To provide a high-resolution image of a capillary of a mucous membrane surface layer for a diagnosis.SOLUTION: A first irradiation operation of irradiating narrow band light at maximum intensity (first intensity) and a second irradiation operation of irradiating narrow band light at normal intensity (second intensity) are alternately repeated in units of storage periods of a CCD 33 when non-enlargement is selected by a zoom operating switch. An image processing circuit 49 extracts a capillary component b of the mucous membrane surface layer from a G pixel value g obtained in the first irradiation operation by correlative operation to an R pixel value r obtained in the first irradiation operation. A display control circuit 50 allocates a B pixel value b obtained in the second irradiation operation and the extracted component b to B, G channels of a monitor 19 and a G pixel value g obtained in the second irradiation operation to an R channel respectively. An emphasized image of the capillary colored in reddish brown is displayed on the monitor 19.COPYRIGHT: (C)2012,JPO&INPIT【課題】高解像度な粘膜表層の毛細血管の画像を診断に供する。【解決手段】ズーム操作スイッチで非拡大が選択されたときに、最大強度(第一の強度)で狭帯域光を照射する第一照射動作と、通常の強度(第二の強度)で狭帯域光を照射する第二照射動作をCCD33の蓄積期間単位で交互に繰り返させる。画像処理回路49は、第一照射動作で得たR画素値rとの相関演算により、第一照射動作で得たG画素値gから粘膜表層の毛細血管の成分b’を抽出する。表示制御回路50は、第二照射動作で得たB画素値bと抽出した成分b’をモニタ19のB、Gチャンネルに、第二照射動作で得たG画素値gをRチャンネルにそれぞれ割り当てる。モニタ19には毛細血管が赤褐色に着色された強調画像が表示される。【選択図】図2
