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authorNick White <git@njw.name>2019-09-27 18:17:48 +0100
committerNick White <git@njw.name>2019-09-27 18:17:48 +0100
commit33e538c56f7513f1b98cab16de771a47a0e2a300 (patch)
treeefb88dea35913b32cc8e890595108ef85e71ac27 /preproc/wipesides.go
parent99f716ceb58b72016a7828d6956a1160e4346737 (diff)
Improve wiping procedure to work better with 2 column layouts
Diffstat (limited to 'preproc/wipesides.go')
-rw-r--r--preproc/wipesides.go10
1 files changed, 7 insertions, 3 deletions
diff --git a/preproc/wipesides.go b/preproc/wipesides.go
index 9b8387a..24fb7bd 100644
--- a/preproc/wipesides.go
+++ b/preproc/wipesides.go
@@ -39,20 +39,24 @@ func findbestedge(img integralimg.I, x int, w int) int {
}
// findedges finds the edges of the main content, by moving a window of wsize
-// from the middle of the image to the left and right, stopping when it reaches
+// from near the middle of the image to the left and right, stopping when it reaches
// a point at which there is a lower proportion of black pixels than thresh.
func findedges(img integralimg.I, wsize int, thresh float64) (int, int) {
maxx := len(img[0]) - 1
var lowedge, highedge int = 0, maxx
- for x := maxx / 2; x < maxx-wsize; x++ {
+ // don't start at the middle, as this will fail for 2 column layouts,
+ // start 10% left or right of the middle
+ notcentre := maxx / 10
+
+ for x := maxx / 2 + notcentre; x < maxx-wsize; x++ {
if proportion(img, x, wsize) <= thresh {
highedge = findbestedge(img, x, wsize)
break
}
}
- for x := maxx / 2; x > 0; x-- {
+ for x := maxx / 2 - notcentre; x > 0; x-- {
if proportion(img, x, wsize) <= thresh {
lowedge = findbestedge(img, x, wsize)
break