In case of chrominance channel selection, blue-yellow chrominance channel b is chosen since it gives less noisy and more accurate results.
In order to model the slow-smoke color, luminance channel is subtracted from chrominance channel and linear interpolation is performed to fit the range of values to [0,255].
Lab color space is used for luminance and chrominance channels separation.
All the parameters of the encoded video signal, such as the black level, blanking level and super-white pulse levels in the luminance channel, and the differential gain and color burst amplitude of the chrominance channel
, are programmable via the encoder's high speed I2C-bus interface.
Therefore, we transform the image into YCbCr, take the luminance channel as a grayscale image for the 2D-DCT transformation and computation of the FM and IM values, and take the chrominance channel
to find the CM values.
The processed L channel is then combined with the chrominance channels
('a' and 'b') and converted back to RGB color space.
L from CIE LAB, V from HSV or Y from YIQ, as the chrominance channels
usually do not contain the data useful for further binarization and recognition.
This article presents an image conversion method from color space to grayscale, using Fourier transform on luminance and chrominance channels.
CIE space is suitable for this method because it offers a clear separation of luminance and chrominance channels, allowing for a better control over contrast differences.
H calculates grayscale intensity modified in Fourier domain, E, using Fourier transform values applied over luminance and each of two chrominance channels.