Fixes ticket #7441.
for block contrast calculate, the block is like this:
|<---------------- stride-----------------------|
+-----------------------------------------------> X
|
| w = 16
| (cx,cy)+------+
| | |
|h=blocksize| |
| | |
| +------+
V
Y
so we calc the block contrast use:
(cy + y) * stride + (cx + x)
Signed-off-by: Jun Zhao <mypopy...@gmail.com>
---
libavfilter/vf_deshake.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/libavfilter/vf_deshake.c b/libavfilter/vf_deshake.c
index 55ce5e1..c8480e7 100644
--- a/libavfilter/vf_deshake.c
+++ b/libavfilter/vf_deshake.c
@@ -196,7 +196,7 @@ static int block_contrast(uint8_t *src, int x, int y, int
stride, int blocksize)
for (i = 0; i <= blocksize * 2; i++) {
// We use a width of 16 here to match the sad function
for (j = 0; j <= 15; j++) {
- pos = (y - i) * stride + (x - j);
+ pos = (y + i) * stride + (x + j);
if (src[pos] < lowest)
lowest = src[pos];
else if (src[pos] > highest) {
--
1.7.1
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