From 4fee22444dab8a5704b03cdd95bc8c7c6e574e0d Mon Sep 17 00:00:00 2001
From: Jake Read <jake.read@cba.mit.edu>
Date: Sun, 17 Nov 2019 12:50:42 -0500
Subject: [PATCH] stash correlate and attempt to go for color
---
hunks/adhoc/correlate.js | 35 +++--------------------------------
1 file changed, 3 insertions(+), 32 deletions(-)
diff --git a/hunks/adhoc/correlate.js b/hunks/adhoc/correlate.js
index 1dd1995..ecc5965 100644
--- a/hunks/adhoc/correlate.js
+++ b/hunks/adhoc/correlate.js
@@ -20,7 +20,6 @@ let correlate = (a, b, x, y) => {
let sumA = 0
let sumB = 0
let sumDot = 0
- let bi = 0
// i will be index within the flat-af array under a,
for(let i = 0; i < a.length; i ++){
for(let j = 0; j < a[0].length; j ++){
@@ -29,36 +28,8 @@ let correlate = (a, b, x, y) => {
sumDot += a[i][j] * b[i + x][j + y]
}
}
- return sumDot / Math.sqrt(sumA * sumA * sumB * sumB)
-
- /*
- for(let i = 0; i < a.data.length; i ++){
- sumA += a.data[i]
- // to find the reciprocal pixel in b,
- // we can start at the top-left corner: here is the 'i_th' element
- // within b, correspondign to the XY of the top-left of a,
- bi = (y * b.width * 4) + x * 4
- // to get down from here, the row of a this i is in:
- let rca = Math.floor(i / a.width * 4)
- bi += rca * b.width * 4
- // and the increment,
- bi += (i % (b.width * 4))
- // ok ?
- if(bi >= b.data.length){
- bi = b.data.length
- // happens all the time, go home do this tomorrow
- console.log('yep', bi, rca, i, x, y)
- //throw new Error('halting')
- }
- sumB += b.data[bi]
-
- sumDot += a.data[i] * b.data[bi]
- }
- */
- //return 55 //(sumDot / Math.sqrt(sumA*sumA + sumB*sumB))
- // a, b are str8 up matricies
- //console.log(b.width)
- // ok, now we can do the maths on a and b, thx
+ // I'm still not convinced this is a really great filter
+ return sumDot / Math.sqrt((sumB * sumB)*(sumA * sumA))
}
let delay = (time) => {
@@ -137,7 +108,7 @@ async function run(a, b){
imdBuffer[lc ++] = dt
imdBuffer[lc ++] = dt
imdBuffer[lc ++] = dt
- imdBuffer[lc ++] = dt
+ imdBuffer[lc ++] = 255
}
}
let imgRes = new ImageData(imdBuffer, resX, resY)
--
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