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

Claim 0:
1. 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 imaging device further comprises smoothing processing circuitry configured to perform a smoothing process on the pixel values of the pixels arranged in the direction in which the streak noise occurs, by using pixel values of pixels adjacent to the pixels arranged in the direction in which the streak noise occurs in a direction crossing the direction in which the streak noise occurs, and calculate, as the target values, smoothed pixel values that are pixel values after smoothing,
wherein the correction coefficient calculation circuitry approximates a plurality of coordinates represented by the pixel values of the pixels arranged in the direction in which the streak noise occurs and the smoothed pixel values, with a polynomial function that is the correction equation, and calculates the plurality of correction coefficients included in the polynomial function.