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⚡️ Speed up method EmbedMaxDct.diffuse_dct_matrix by 18% #163

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⚡️ Speed up method EmbedMaxDct.diffuse_dct_matrix by 18% #163

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15 changes: 12 additions & 3 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 @@ -255,8 +256,16 @@ def infer_dct_svd(self, block, scale):
return 0.0

def diffuse_dct_matrix(self, block, wmBit, scale):
pos = np.argmax(abs(block.flatten()[1:])) + 1
i, j = pos // self._block, pos % self._block
flat_block = block.ravel()
flat1 = flat_block[1:]
# Instead of abs(flat1), use np.abs() for fast elementwise op; also, store result for reuse.
abs_flat1 = np.abs(flat1)
pos = np.argmax(abs_flat1) + 1

# Avoid divmod call, keep original style
i = pos // self._block
j = pos % self._block

val = block[i][j]
if val >= 0.0:
block[i][j] = (val // scale + 0.25 + 0.5 * wmBit) * scale
Expand Down