Image measurement device and method thereof

An image measurement device comprising:

• an optical system that transmits light to an image detection unit;
• the image detection unit configured to detect the light and generate an image;
• and
• an image processing unit that extracts spectral data from the image,
• wherein the optical system comprises a relay lens including at least one lens and a self-interference structure configured to self-interfere the light, and
• the self-interference structure comprises a polarizer that polarizes the light and a retarder that delays a phase of the light.

An image measurement device comprising:

• an optical system that transmits light to an image detection unit;
• the image detection unit configured to detect the light and generate an image;
• and
• an image processing unit that extracts spectral data from the image,
• wherein the optical system comprises a relay lens including at least one lens and a self-interference structure configured to self-interfere the light, and
• the self-interference structure comprises a polarizer that polarizes the light and a retarder that delays the phase of the light, and
• the image processing unit generates a profile according to an amount of light for each of a plurality of pixels based on the image and performs Fourier transform on the profile,
• the image processing unit separates the profile into a high-frequency region and a low-frequency region by performing Fourier transform on the profile, and
• divides the high-frequency region into a plurality of sections through windowing, and extracts frequency components by applying preset weights to the plurality of sections, and extracts spectral data from the frequency components by using zoom Fast Fourier transform.