<p> plotG </p>

c4cb406b-8a52-40b8-bf86-853b01f58c6d 6 6 9 decimal

&[DATE] &[TIME] - &[FILENAME]

<p> plotG </p>

vx vy a b c plotG a char ≡ b size ≡ c color ≡ 13 mat n vx length : plot vx 1 el vy 1 el a b c augment : i 2 n range plot plot vx i el vy i el a b c augment stack : for plot 51 line :

M mirror M transpose reverse transpose :

Vectorise Diagonal M Dia Diagonal elements i 1 M rows range Dia i el M i i el : for Dia 31 line :

n T n i 1 n range : n i n i transpose * 21 line :

n 19 :

vx n T Dia : vy n T mirror Dia : idx 1 n range : m vx vy augment : 41 line

data vx vy . 12 red plotG :

arc idx vy . 12 red plotG :

m data 2 1 sys idx vy augment arc 1 idx vx augment ( * 3 1 sys

The Delta Matrix

n s Δ i 1 n range j 1 n range Δ i j el i j + s 1 + ≤ : for for Δ 21 line :

105 Δ 11111000001111000000111000000011000000001000000000000000000000000000000000000000000000000000000000001010 mat

The Δelta matrix is the core component of the JPG destruction principle. Once the image is "fft", the new components go from DC [upper left] down along the main diagonal to the highest frequency [lower right]. Multiplying Δ by the "fft" image => truncates [destroys]. Next: "ifft" to recover JPG of reduced sized and reduced details ...