PROBLEM TO BE SOLVED: To accurately observe a condition near a blast furnace tuyere independently from fluctuation in a blast furnace tuyere image due to fire.SOLUTION: The present invention is a method for observing a condition in a blast furnace tuyere by utilizing a thermal radiation intensity image taken by an imaging apparatus arranged on the blast furnace tuyere, comprising: a step of identifying an ellipse shape matching with an outline shape by applying ellipse shapes to an outline shape of a tuyere from each of thermal radiation intensity images; a step of carrying out geometric transformation to each of thermal radiation intensity images to generate a normalized image and carrying out polar conversion to the normalized image with ellipse parameters of the identified ellipse shape so that each of outline shapes to be a normalized circle having a determined center position and a determined radius; a step of generating a binarized image by binarizing the normalized image after polar conversion generated; and a step of generating light part distribution information showing distribution in the radial direction of a normalized circle of light parts present in the generated binarized image by utilizing the binarized image generated.SELECTED DRAWING: Figure 5
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