Image processing device and image processing method

[0032]3. Modification example

3-1. Outline of inter-frame differencing technique

3-2. Functional configuration

3-3. Operation

4. Summary

1. INTRODUCTION

[0033]FIG. 1 is an explanatory diagram illustrating various applications of an infrared image which depends on a wavelength. The horizontal direction of FIG. 1 corresponds to a wavelength of the infrared light and the wavelength is lengthened from the left to the right. Light that has a wavelength equal to or less than 0.7 μm is visible light and a human visual sense detects the visible light. A wavelength region adjacent to the visible light region is a near-infrared light region (NIR) and the infrared light belonging to the NIR region is referred to as near-infrared light. The upper limit of the wavelength of the NIR region differs depending on definition and is between 2.5 μm to 4.0 μm in many cases. A portion with a relatively long wavelength in the NIR region is also referred to as a short-wavelength infrared (SWIR) region in some cases