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⚡️ Speed up method EmbedMaxDct.infer_dct_matrix by 21% #164

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⚡️ Speed up method EmbedMaxDct.infer_dct_matrix by 21% #164

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18 changes: 12 additions & 6 deletions invokeai/backend/image_util/imwatermark/vendor.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,9 +7,10 @@
# `opencv-contrib-python`. It's easier to copy the code over than complicate the installation process by
# requiring an extra post-install step of removing `opencv-python` and installing `opencv-contrib-python`.

import base64
import struct
import uuid
import base64

import cv2
import numpy as np
import pywt
Expand Down Expand Up @@ -266,12 +267,17 @@ def diffuse_dct_matrix(self, block, wmBit, scale):
return block

def infer_dct_matrix(self, block, scale):
pos = np.argmax(abs(block.flatten()[1:])) + 1
i, j = pos // self._block, pos % self._block

val = block[i][j]
# Inline routine for fast max-abs with index (excluding DC)
flat = block.ravel()
v = flat[1:]
abs_v = np.abs(v)
pos_in_v = np.argmax(abs_v)
pos = pos_in_v + 1 # because we skipped DC at index 0

i, j = divmod(pos, self._block)
val = block[i, j]
if val < 0:
val = abs(val)
val = -val # abs(val), but avoids Python function call

if (val % scale) > 0.5 * scale:
return 1
Expand Down