From 7f81ffb41b425940d2ed87df73cfb153a0b18d8b Mon Sep 17 00:00:00 2001
From: Justin Chu <justinchuby@users.noreply.github.com>
Date: Tue, 5 Sep 2023 19:10:12 -0700
Subject: [PATCH] Use Pillow to implement ImageDecoder (#5555)

Use Pillow to replace opencv to implement ImageDecoder to remove
dependency on the heavy opencv. Code change made with help from Copilot
Chat.

### Motivation and Context

Fixes #5545

---------

Signed-off-by: Justin Chu <justinchu@microsoft.com>
Co-authored-by: Chun-Wei Chen <jacky82226@gmail.com>
---
 .github/workflows/release_win.yml             |   3 +-
 docs/Operators.md                             |  18 +++---
 docs/TestCoverage.md                          |  18 +++---
 onnx/backend/test/case/node/image_decoder.py  |  59 +++++++++++-------
 .../model.onnx                                | Bin 165 -> 165 bytes
 .../test_data_set_0/input_0.pb                | Bin 4868 -> 3140 bytes
 .../test_data_set_0/output_0.pb               | Bin 4819 -> 3091 bytes
 .../model.onnx                                | Bin 168 -> 168 bytes
 .../test_data_set_0/input_0.pb                | Bin 1220 -> 1901 bytes
 .../test_data_set_0/output_0.pb               | Bin 4819 -> 3091 bytes
 .../model.onnx                                | Bin 166 -> 166 bytes
 .../test_data_set_0/input_0.pb                | Bin 2221 -> 1072 bytes
 .../test_data_set_0/output_0.pb               | Bin 4819 -> 3091 bytes
 .../model.onnx                                | Bin 178 -> 178 bytes
 .../test_data_set_0/input_0.pb                | Bin 2221 -> 1072 bytes
 .../test_data_set_0/output_0.pb               |  11 +++-
 .../model.onnx                                | Bin 166 -> 166 bytes
 .../test_data_set_0/input_0.pb                | Bin 2221 -> 1072 bytes
 .../test_data_set_0/output_0.pb               | Bin 4819 -> 3091 bytes
 .../model.onnx                                | Bin 165 -> 165 bytes
 .../test_data_set_0/input_0.pb                | Bin 1366 -> 326 bytes
 .../test_data_set_0/output_0.pb               | Bin 4819 -> 3091 bytes
 .../model.onnx                                | Bin 165 -> 165 bytes
 .../test_data_set_0/input_0.pb                | Bin 4827 -> 3099 bytes
 .../test_data_set_0/output_0.pb               | Bin 4819 -> 3091 bytes
 .../model.onnx                                | Bin 166 -> 166 bytes
 .../test_data_set_0/input_0.pb                | Bin 1194 -> 3226 bytes
 .../test_data_set_0/output_0.pb               | Bin 4819 -> 3091 bytes
 .../model.onnx                                | Bin 166 -> 166 bytes
 .../test_data_set_0/input_0.pb                | Bin 374 -> 566 bytes
 .../test_data_set_0/output_0.pb               | Bin 4819 -> 3091 bytes
 onnx/reference/ops/op_image_decoder.py        |  28 ++++-----
 onnx/test/reference_evaluator_backend_test.py |  28 +++------
 onnx/test/test_backend_reference.py           |   3 +-
 pyproject_pylint.toml                         |   5 +-
 requirements-reference.txt                    |   2 +-
 36 files changed, 94 insertions(+), 81 deletions(-)

diff --git a/.github/workflows/release_win.yml b/.github/workflows/release_win.yml
index 433535c4589..acca98ad17e 100644
--- a/.github/workflows/release_win.yml
+++ b/.github/workflows/release_win.yml
@@ -50,7 +50,8 @@ jobs:
         python -m pip install -q --upgrade pip
         cd onnx
         if ('${{ matrix.architecture }}' -eq 'x86') {
-          sed -i '' '/google-re2/d' requirements-release.txt
+          sed -i '' '/google-re2/d' requirements-reference.txt
+          sed -i '' '/Pillow/d' requirements-reference.txt
         }
         python -m pip install -q -r requirements-release.txt
 
diff --git a/docs/Operators.md b/docs/Operators.md
index f3c8e9be5e0..77df2ec9232 100644
--- a/docs/Operators.md
+++ b/docs/Operators.md
@@ -12138,7 +12138,7 @@ node = onnx.helper.make_node(
     pixel_format="RGB",
 )
 
-data, output = generate_test_data(".bmp", "RGB")
+data, output = _generate_test_data("bmp", "RGB")
 expect(
     node,
     inputs=[data],
@@ -12161,7 +12161,7 @@ node = onnx.helper.make_node(
     pixel_format="RGB",
 )
 
-data, output = generate_test_data(".jp2", "RGB")
+data, output = _generate_test_data("jpeg2000", "RGB")
 expect(
     node,
     inputs=[data],
@@ -12184,7 +12184,7 @@ node = onnx.helper.make_node(
     pixel_format="BGR",
 )
 
-data, output = generate_test_data(".jpg", "BGR")
+data, output = _generate_test_data("jpeg", "BGR")
 expect(
     node,
     inputs=[data],
@@ -12207,7 +12207,7 @@ node = onnx.helper.make_node(
     pixel_format="Grayscale",
 )
 
-data, output = generate_test_data(".jpg", "Grayscale")
+data, output = _generate_test_data("jpeg", "Grayscale")
 expect(
     node,
     inputs=[data],
@@ -12230,7 +12230,7 @@ node = onnx.helper.make_node(
     pixel_format="RGB",
 )
 
-data, output = generate_test_data(".jpg", "RGB")
+data, output = _generate_test_data("jpeg", "RGB")
 expect(
     node,
     inputs=[data],
@@ -12253,7 +12253,7 @@ node = onnx.helper.make_node(
     pixel_format="RGB",
 )
 
-data, output = generate_test_data(".png", "RGB")
+data, output = _generate_test_data("png", "RGB")
 expect(
     node,
     inputs=[data],
@@ -12276,7 +12276,7 @@ node = onnx.helper.make_node(
     pixel_format="RGB",
 )
 
-data, output = generate_test_data(".pnm", "RGB")
+data, output = _generate_test_data("ppm", "RGB")
 expect(
     node,
     inputs=[data],
@@ -12299,7 +12299,7 @@ node = onnx.helper.make_node(
     pixel_format="RGB",
 )
 
-data, output = generate_test_data(".tiff", "RGB")
+data, output = _generate_test_data("tiff", "RGB")
 expect(
     node,
     inputs=[data],
@@ -12322,7 +12322,7 @@ node = onnx.helper.make_node(
     pixel_format="RGB",
 )
 
-data, output = generate_test_data(".webp", "RGB")
+data, output = _generate_test_data("webp", "RGB")
 expect(
     node,
     inputs=[data],
diff --git a/docs/TestCoverage.md b/docs/TestCoverage.md
index 2c76fd88a21..669f2d5851e 100644
--- a/docs/TestCoverage.md
+++ b/docs/TestCoverage.md
@@ -8194,7 +8194,7 @@ node = onnx.helper.make_node(
     pixel_format="RGB",
 )
 
-data, output = generate_test_data(".bmp", "RGB")
+data, output = _generate_test_data("bmp", "RGB")
 expect(
     node,
     inputs=[data],
@@ -8215,7 +8215,7 @@ node = onnx.helper.make_node(
     pixel_format="RGB",
 )
 
-data, output = generate_test_data(".jp2", "RGB")
+data, output = _generate_test_data("jpeg2000", "RGB")
 expect(
     node,
     inputs=[data],
@@ -8236,7 +8236,7 @@ node = onnx.helper.make_node(
     pixel_format="BGR",
 )
 
-data, output = generate_test_data(".jpg", "BGR")
+data, output = _generate_test_data("jpeg", "BGR")
 expect(
     node,
     inputs=[data],
@@ -8257,7 +8257,7 @@ node = onnx.helper.make_node(
     pixel_format="Grayscale",
 )
 
-data, output = generate_test_data(".jpg", "Grayscale")
+data, output = _generate_test_data("jpeg", "Grayscale")
 expect(
     node,
     inputs=[data],
@@ -8278,7 +8278,7 @@ node = onnx.helper.make_node(
     pixel_format="RGB",
 )
 
-data, output = generate_test_data(".jpg", "RGB")
+data, output = _generate_test_data("jpeg", "RGB")
 expect(
     node,
     inputs=[data],
@@ -8299,7 +8299,7 @@ node = onnx.helper.make_node(
     pixel_format="RGB",
 )
 
-data, output = generate_test_data(".png", "RGB")
+data, output = _generate_test_data("png", "RGB")
 expect(
     node,
     inputs=[data],
@@ -8320,7 +8320,7 @@ node = onnx.helper.make_node(
     pixel_format="RGB",
 )
 
-data, output = generate_test_data(".pnm", "RGB")
+data, output = _generate_test_data("ppm", "RGB")
 expect(
     node,
     inputs=[data],
@@ -8341,7 +8341,7 @@ node = onnx.helper.make_node(
     pixel_format="RGB",
 )
 
-data, output = generate_test_data(".tiff", "RGB")
+data, output = _generate_test_data("tiff", "RGB")
 expect(
     node,
     inputs=[data],
@@ -8362,7 +8362,7 @@ node = onnx.helper.make_node(
     pixel_format="RGB",
 )
 
-data, output = generate_test_data(".webp", "RGB")
+data, output = _generate_test_data("webp", "RGB")
 expect(
     node,
     inputs=[data],
diff --git a/onnx/backend/test/case/node/image_decoder.py b/onnx/backend/test/case/node/image_decoder.py
index 69105dee62d..88163a6365b 100644
--- a/onnx/backend/test/case/node/image_decoder.py
+++ b/onnx/backend/test/case/node/image_decoder.py
@@ -1,16 +1,19 @@
 # Copyright (c) ONNX Project Contributors
 #
 # SPDX-License-Identifier: Apache-2.0
+from __future__ import annotations
+
+import io
 
-import cv2
 import numpy as np
+import PIL.Image
 
 import onnx
 from onnx.backend.test.case.base import Base
 from onnx.backend.test.case.node import expect
 
 
-def generate_checkerboard(width, height, square_size):
+def generate_checkerboard(width: int, height: int, square_size: int) -> np.ndarray:
     # Create an empty RGB image
     image = np.zeros((height, width, 3), dtype=np.uint8)
 
@@ -39,22 +42,32 @@ def generate_checkerboard(width, height, square_size):
     return image
 
 
-def generate_test_data(extension, pixel_format="RGB", h=40, w=40, tile_sz=5):
-    data, output = None, None
+def _generate_test_data(
+    format_: str,
+    pixel_format: str = "RGB",
+    height: int = 32,
+    width: int = 32,
+    tile_sz: int = 5,
+) -> tuple[np.ndarray, np.ndarray]:
     np.random.seed(12345)
-    image = generate_checkerboard(h, w, tile_sz)
-    image_bgr = cv2.cvtColor(image, cv2.COLOR_RGB2BGR)
-    _, encoded_image = cv2.imencode(extension, image_bgr)
-    data = np.frombuffer(encoded_image, dtype=np.uint8)
+    image = generate_checkerboard(height, width, tile_sz)
+    image_pil = PIL.Image.fromarray(image)
+    with io.BytesIO() as f:
+        image_pil.save(f, format=format_)
+        data = f.getvalue()
+        data_array = np.frombuffer(data, dtype=np.uint8)
     if pixel_format == "BGR":
-        output = cv2.imdecode(data, cv2.IMREAD_COLOR)
+        output_pil = PIL.Image.open(io.BytesIO(data))
+        output = np.array(output_pil)[:, :, ::-1]
     elif pixel_format == "RGB":
-        output_bgr = cv2.imdecode(data, cv2.IMREAD_COLOR)
-        output = cv2.cvtColor(output_bgr, cv2.COLOR_BGR2RGB)
+        output_pil = PIL.Image.open(io.BytesIO(data))
+        output = np.array(output_pil)
     elif pixel_format == "Grayscale":
-        output = cv2.imdecode(data, cv2.IMREAD_GRAYSCALE)
-        output = np.expand_dims(output, axis=2)  # (H, W) to (H, W, 1)
-    return data, output
+        output_pil = PIL.Image.open(io.BytesIO(data)).convert("L")
+        output = np.array(output_pil)[:, :, np.newaxis]
+    else:
+        raise ValueError(f"Unsupported pixel format: {pixel_format}")
+    return data_array, output
 
 
 class ImageDecoder(Base):
@@ -67,7 +80,7 @@ def export_image_decoder_decode_jpeg_rgb() -> None:
             pixel_format="RGB",
         )
 
-        data, output = generate_test_data(".jpg", "RGB")
+        data, output = _generate_test_data("jpeg", "RGB")
         expect(
             node,
             inputs=[data],
@@ -84,7 +97,7 @@ def export_image_decoder_decode_jpeg_grayscale() -> None:
             pixel_format="Grayscale",
         )
 
-        data, output = generate_test_data(".jpg", "Grayscale")
+        data, output = _generate_test_data("jpeg", "Grayscale")
         expect(
             node,
             inputs=[data],
@@ -101,7 +114,7 @@ def export_image_decoder_decode_jpeg_bgr() -> None:
             pixel_format="BGR",
         )
 
-        data, output = generate_test_data(".jpg", "BGR")
+        data, output = _generate_test_data("jpeg", "BGR")
         expect(
             node,
             inputs=[data],
@@ -118,7 +131,7 @@ def export_image_decoder_decode_jpeg2k_rgb() -> None:
             pixel_format="RGB",
         )
 
-        data, output = generate_test_data(".jp2", "RGB")
+        data, output = _generate_test_data("jpeg2000", "RGB")
         expect(
             node,
             inputs=[data],
@@ -135,7 +148,7 @@ def export_image_decoder_decode_bmp_rgb() -> None:
             pixel_format="RGB",
         )
 
-        data, output = generate_test_data(".bmp", "RGB")
+        data, output = _generate_test_data("bmp", "RGB")
         expect(
             node,
             inputs=[data],
@@ -152,7 +165,7 @@ def export_image_decoder_decode_png_rgb() -> None:
             pixel_format="RGB",
         )
 
-        data, output = generate_test_data(".png", "RGB")
+        data, output = _generate_test_data("png", "RGB")
         expect(
             node,
             inputs=[data],
@@ -169,7 +182,7 @@ def export_image_decoder_decode_tiff_rgb() -> None:
             pixel_format="RGB",
         )
 
-        data, output = generate_test_data(".tiff", "RGB")
+        data, output = _generate_test_data("tiff", "RGB")
         expect(
             node,
             inputs=[data],
@@ -186,7 +199,7 @@ def export_image_decoder_decode_webp_rgb() -> None:
             pixel_format="RGB",
         )
 
-        data, output = generate_test_data(".webp", "RGB")
+        data, output = _generate_test_data("webp", "RGB")
         expect(
             node,
             inputs=[data],
@@ -203,7 +216,7 @@ def export_image_decoder_decode_pnm_rgb() -> None:
             pixel_format="RGB",
         )
 
-        data, output = generate_test_data(".pnm", "RGB")
+        data, output = _generate_test_data("ppm", "RGB")
         expect(
             node,
             inputs=[data],
diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_bmp_rgb/model.onnx b/onnx/backend/test/data/node/test_image_decoder_decode_bmp_rgb/model.onnx
index 69eded0b8b4deffb42b8c33a74014f236683ea9f..0b90ba5f2d443c1b3a3ed4229839fb841924ef36 100644
GIT binary patch
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diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_bmp_rgb/test_data_set_0/input_0.pb b/onnx/backend/test/data/node/test_image_decoder_decode_bmp_rgb/test_data_set_0/input_0.pb
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diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_bmp_rgb/test_data_set_0/output_0.pb b/onnx/backend/test/data/node/test_image_decoder_decode_bmp_rgb/test_data_set_0/output_0.pb
index 6ed563ac91a35cc6878819920b4eeeda82ac4d90..8a8f1a1a41523f93540c1f1248099fc29a2519de 100644
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diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_jpeg2k_rgb/model.onnx b/onnx/backend/test/data/node/test_image_decoder_decode_jpeg2k_rgb/model.onnx
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diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_jpeg2k_rgb/test_data_set_0/input_0.pb b/onnx/backend/test/data/node/test_image_decoder_decode_jpeg2k_rgb/test_data_set_0/input_0.pb
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index ae321908c3c2306c879bd373a2c5e2bfafb214f4..8a8f1a1a41523f93540c1f1248099fc29a2519de 100644
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diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_bgr/model.onnx b/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_bgr/model.onnx
index 6278b3c7fd38457b456ef810496b5f324d79e5b7..24334e7a438eaa4b1101e873352f759c20096074 100644
GIT binary patch
delta 45
vcmZ3+xQuZ^gW4jFBpEKY{L+$w(h?ydE&&cEAs#L!4h1M?c4FaT5D)<X_%R2^

delta 45
vcmZ3+xQuZ^gW7z-BpEKY{L+$w(h?ydE&&cEAs#L!4h<+~c4FaT5D)<X`P>KH

diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_bgr/test_data_set_0/input_0.pb b/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_bgr/test_data_set_0/input_0.pb
index 1773f14db39ee32c8a7d9cf897b8f153d15f70a9..4436a575c7eefba45209a5441acbe0663d06024b 100644
GIT binary patch
delta 609
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diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_bgr/test_data_set_0/output_0.pb b/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_bgr/test_data_set_0/output_0.pb
index bdce5b58386638490ea838c32aafdc17f4417548..9bf17faea46fe5987904f42795bb05240dd32b7b 100644
GIT binary patch
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index 61b1beb83fa36270c7b1275040edcefde7f3a47a..4a643cede44636e7354cbac45f08a6ce293d5794 100644
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delta 45
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delta 45
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index 1773f14db39ee32c8a7d9cf897b8f153d15f70a9..4436a575c7eefba45209a5441acbe0663d06024b 100644
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diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_grayscale/test_data_set_0/output_0.pb b/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_grayscale/test_data_set_0/output_0.pb
index 7117d4fc04b..763045579db 100644
--- a/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_grayscale/test_data_set_0/output_0.pb
+++ b/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_grayscale/test_data_set_0/output_0.pb
@@ -1 +1,10 @@
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diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_rgb/model.onnx b/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_rgb/model.onnx
index d2dd7b9a20812df660b8d9c73644a49216ae297f..10801be8190241528b6b5844156ae1971d17edea 100644
GIT binary patch
delta 45
vcmZ3+xQuZ^gW4jFBpEKY{L+$w(h?ydE&&cEAs#L!4h1M?c4FaT5D)<X_%R2^

delta 45
vcmZ3+xQuZ^gW7z-BpEKY{L+$w(h?ydE&&cEAs#L!4h<+~c4FaT5D)<X`P>KH

diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_rgb/test_data_set_0/input_0.pb b/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_rgb/test_data_set_0/input_0.pb
index 1773f14db39ee32c8a7d9cf897b8f153d15f70a9..4436a575c7eefba45209a5441acbe0663d06024b 100644
GIT binary patch
delta 609
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diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_rgb/test_data_set_0/output_0.pb b/onnx/backend/test/data/node/test_image_decoder_decode_jpeg_rgb/test_data_set_0/output_0.pb
index bb2d5aa1168b3b8a939a0c0a4b37462b149869bf..087c56793b559ac60625e67ba1917b8ced4425df 100644
GIT binary patch
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diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_png_rgb/model.onnx b/onnx/backend/test/data/node/test_image_decoder_decode_png_rgb/model.onnx
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diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_png_rgb/test_data_set_0/input_0.pb b/onnx/backend/test/data/node/test_image_decoder_decode_png_rgb/test_data_set_0/input_0.pb
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diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_pnm_rgb/model.onnx b/onnx/backend/test/data/node/test_image_decoder_decode_pnm_rgb/model.onnx
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diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_tiff_rgb/model.onnx b/onnx/backend/test/data/node/test_image_decoder_decode_tiff_rgb/model.onnx
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diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_tiff_rgb/test_data_set_0/input_0.pb b/onnx/backend/test/data/node/test_image_decoder_decode_tiff_rgb/test_data_set_0/input_0.pb
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diff --git a/onnx/backend/test/data/node/test_image_decoder_decode_webp_rgb/model.onnx b/onnx/backend/test/data/node/test_image_decoder_decode_webp_rgb/model.onnx
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diff --git a/onnx/reference/ops/op_image_decoder.py b/onnx/reference/ops/op_image_decoder.py
index 0eeae4271ce..ea5018c881a 100644
--- a/onnx/reference/ops/op_image_decoder.py
+++ b/onnx/reference/ops/op_image_decoder.py
@@ -1,7 +1,10 @@
 # Copyright (c) ONNX Project Contributors
 
 # SPDX-License-Identifier: Apache-2.0
-# pylint: disable=C0123,C3001,R0912,R0913,R0914,R1730,W0221,W0613
+
+from __future__ import annotations
+
+import io
 
 import numpy as np
 
@@ -9,27 +12,22 @@
 
 
 class ImageDecoder(OpRun):
-    def _run(  # type: ignore
-        self,
-        encoded,
-        pixel_format="RGB",
-    ):
+    def _run(self, encoded: np.ndarray, pixel_format="RGB") -> tuple[np.ndarray]:  # type: ignore
         try:
-            # pylint: disable=import-outside-toplevel`
-            import cv2
+            import PIL.Image  # pylint: disable=import-outside-toplevel
         except ImportError as e:
             raise ImportError(
-                "opencv-python must be installed to use the reference implementation of the ImageDecoder operator"
+                "Pillow must be installed to use the reference implementation of the ImageDecoder operator"
             ) from e
-        decoded = None
+        img = PIL.Image.open(io.BytesIO(encoded.tobytes()))
         if pixel_format == "BGR":
-            decoded = cv2.imdecode(encoded, cv2.IMREAD_COLOR)
+            decoded = np.array(img)[:, :, ::-1]
         elif pixel_format == "RGB":
-            decoded = cv2.imdecode(encoded, cv2.IMREAD_COLOR)
-            decoded = cv2.cvtColor(decoded, cv2.COLOR_BGR2RGB)
+            decoded = np.array(img)
         elif pixel_format == "Grayscale":
-            decoded = cv2.imdecode(encoded, cv2.IMREAD_GRAYSCALE)
+            img = img.convert("L")
+            decoded = np.array(img)
             decoded = np.expand_dims(decoded, axis=2)  # (H, W) to (H, W, 1)
         else:
-            raise RuntimeError(f"pixel_format={pixel_format!r} is not supported.")
+            raise ValueError(f"pixel_format={pixel_format!r} is not supported.")
         return (decoded,)
diff --git a/onnx/test/reference_evaluator_backend_test.py b/onnx/test/reference_evaluator_backend_test.py
index 65336296cc8..4d924eda28d 100644
--- a/onnx/test/reference_evaluator_backend_test.py
+++ b/onnx/test/reference_evaluator_backend_test.py
@@ -71,12 +71,6 @@
     "test__simple_gradient_of_add_and_mul",  # gradient not implemented
 }
 
-if version(npver) < version("1.21.5"):
-    SKIP_TESTS |= {
-        "test_cast_FLOAT_to_BFLOAT16",
-        "test_castlike_FLOAT_to_BFLOAT16",
-        "test_castlike_FLOAT_to_BFLOAT16_expanded",
-    }
 if version(npver) < version("1.21.5"):
     SKIP_TESTS |= {
         "test_cast_FLOAT_to_BFLOAT16",
@@ -88,6 +82,15 @@
         "test_regex_full_match_basic",
         "test_regex_full_match_email_domain",
         "test_regex_full_match_empty",
+        "test_image_decoder_decode_jpeg_rgb",
+        "test_image_decoder_decode_jpeg_grayscale",
+        "test_image_decoder_decode_jpeg_bgr",
+        "test_image_decoder_decode_jpeg2k_rgb",
+        "test_image_decoder_decode_bmp_rgb",
+        "test_image_decoder_decode_png_rgb",
+        "test_image_decoder_decode_tiff_rgb",
+        "test_image_decoder_decode_webp_rgb",
+        "test_image_decoder_decode_pnm_rgb",
     }
 
 
@@ -577,19 +580,6 @@ def run_fct(obj, *inputs, verbose=0):  # pylint: disable=W0613
         got = obj.run(None, feeds)
         return got
 
-    # def test_onnx_test_run_test_abs(self):
-    #     done = 0
-    #     for te in enumerate_onnx_tests("node", lambda folder: folder == "test_abs"):
-    #         self.assertIn(te.name, repr(te))
-    #         self.assertGreater(len(te), 0)
-    #         te.run(
-    #             TestOnnxBackEndWithReferenceEvaluator.load_fct,
-    #             TestOnnxBackEndWithReferenceEvaluator.run_fct,
-    #             comment="[runtime=ReferenceEvaluator]",
-    #         )
-    #         done += 1
-    #     self.assertEqual(done, 1)
-
     def common_test_onnx_test_run(
         self,
         te,
diff --git a/onnx/test/test_backend_reference.py b/onnx/test/test_backend_reference.py
index 3627060f4bd..531c3b527a1 100644
--- a/onnx/test/test_backend_reference.py
+++ b/onnx/test/test_backend_reference.py
@@ -173,11 +173,12 @@ def run_node(cls, node, inputs, device=None, outputs_info=None, **kwargs):
 # The following tests fail due to discrepancies (small but still higher than 1e-7).
 backend_test.exclude("test_adam_multiple")  # 1e-2
 
-# Currently google-re2 is not supported on Win32 and is required for the reference implementation of RegexFullMatch.
+# Currently google-re2/Pillow is not supported on Win32 and is required for the reference implementation of RegexFullMatch.
 if sys.platform == "win32":
     backend_test.exclude("test_regex_full_match_basic_cpu")
     backend_test.exclude("test_regex_full_match_email_domain_cpu")
     backend_test.exclude("test_regex_full_match_empty_cpu")
+    backend_test.exclude("test_image_decoder_decode_")
 
 # import all test cases at global scope to make them visible to python.unittest
 globals().update(backend_test.test_cases)
diff --git a/pyproject_pylint.toml b/pyproject_pylint.toml
index 9752a67beec..572f2b70456 100644
--- a/pyproject_pylint.toml
+++ b/pyproject_pylint.toml
@@ -3,11 +3,12 @@
 
 [tool.pylint.messages_control]
 disable = [
+    "arguments-differ",  # The reference runtime tend to use inheritance and redefine methods.
     "cyclic-import",
     "fixme",
     "format",
     "import-error",
-    "invalid-name",                   # TODO: Add naming guidance and enable this check.
+    "invalid-name",  # TODO: Add naming guidance and enable this check.
     "line-too-long",
     "missing-docstring",
     "no-else-return",
@@ -20,7 +21,7 @@ disable = [
     "too-many-locals",
     "too-many-public-methods",
     "too-many-return-statements",
-    "use-dict-literal",     # Dict literals are sometimes preferable when creating kwargs
+    "use-dict-literal",  # Dict literals are sometimes preferable when creating kwargs
     "useless-return",
     "wrong-import-order",
 ]
diff --git a/requirements-reference.txt b/requirements-reference.txt
index d03b30f5747..08511fa533e 100644
--- a/requirements-reference.txt
+++ b/requirements-reference.txt
@@ -1,2 +1,2 @@
 google-re2
-opencv-python
\ No newline at end of file
+Pillow