How to Look at Spectral Images?
A Tentative Use of Metameric Black for Spectral Image Visualisation

Abstract

Introduction

Fundamental basics

Types of images

Reflectance channel for wavelength=380nm

Color matching function

Color Matching Function

Metameric Black

Metameric black from the spectral image and fundamental metamer of the pixel (50,260)

Experiments and Results

The RGB image

RGB image under the D65 illuminant
RGB image under the A illuminant

Visualizing the fundamental metamer

Fundamental metamer under the D65 illuminant, in the RGB form

Visualizing the metameric black

RGB image of the metameric black with its negative values
RGB image of the metameric black with the positive values using the square method
RGB image of the metameric black with the positive values using absolute values method
RGB image of the metameric black with the positive values using the optimized absolute values method

Analysis

The first cow with the two part that we will use the calculate the distance
The distances between each part for the first approach (square of all the pixels)
The distances between each part for the second approach (absolute values of the pixels)
The distances between each part for the third approach (optimized absolute values of the pixels)
Approach 1, 2, and 3 for the same first cow

Conclusion

I'm a computer vision student, YouTuber and online content creator

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store