Patent ID: 11937009
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC H

Claim 6:
7. An infrared imaging device, comprising:
a thermal image sensor to receive infrared light and output a signal corresponding to the infrared light;
a thermal image generator to generate a single thermal image on a basis of the signal from the thermal image sensor;
correction coefficient calculation circuitry configured to calculate a plurality of correction coefficients included in a correction equation for converting pixel values of pixels included in the single thermal image into target values in which streak noise extending from one end to another end of the single thermal image is reduced; and
thermal image correction circuitry configured to correct a thermal image generated by the thermal image generator by using the plurality of correction coefficients,
wherein the correction coefficient calculation circuitry calculates the plurality of correction coefficients on a basis of difference between pixel values of pixels arranged in a direction in which the streak noise occurs in the single thermal image,
wherein the infrared image device further comprises:
a sorter to sort pixel values of pixels included in a pixel row that is a set of the pixels arranged in the direction in which the streak noise occurs in the single thermal image, in descending or ascending order, and sort pixel values of pixels included in a pixel row adjacent in a direction crossing the direction in which the streak noise occurs, in descending or ascending order,
wherein the correction coefficient calculation circuitry:
approximates coordinates represented by the pixel values of the pixels arranged in the direction in which the streak noise occurs and ordinal positions thereof, with a polynomial function, and calculates coefficients of the polynomial function,
approximates coordinates represented by the pixel values of the pixels included in the adjacent pixel row and ordinal positions thereof, with a polynomial function, and calculates coefficients of the polynomial function,
calculates average coefficients that are average values of the coefficients calculated on a basis of the pixel values of the pixels arranged in the direction in which the streak noise occurs and the coefficients calculated on a basis of the pixel values of the pixels included in the adjacent pixel row, and
calculates the plurality of correction coefficients of the correction equation by using the coefficients calculated on a basis of the pixel values of the pixels having different pixel values and the average coefficients.