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udlbook
2026-01-01 15:33:00 -05:00
parent d45cba5c95
commit 60d50aa9d2
1 changed files with 17 additions and 18 deletions
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35
Notebooks/Chap10/10_4_Downsampling_and_Upsampling.ipynb
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@@ -4,7 +4,6 @@
"metadata": { "metadata": {
"colab": { "colab": {
"provenance": [], "provenance": [],
"authorship_tag": "ABX9TyMbSR8fzpXvO6TIQdO7bI0H",
"include_colab_link": true "include_colab_link": true
}, },
"kernelspec": { "kernelspec": {
@@ -71,9 +70,9 @@
{ {
"cell_type": "code", "cell_type": "code",
"source": [ "source": [
"def subsample(x_in):\n", "def downsample(x_in):\n",
" x_out = np.zeros(( int(np.ceil(x_in.shape[0]/2)), int(np.ceil(x_in.shape[1]/2)) ))\n", " x_out = np.zeros(( int(np.ceil(x_in.shape[0]/2)), int(np.ceil(x_in.shape[1]/2)) ))\n",
" # TODO -- write the subsampling routine\n", " # TODO -- write the downsampling routine\n",
" # Replace this line\n", " # Replace this line\n",
" x_out = x_out\n", " x_out = x_out\n",
"\n", "\n",
@@ -91,8 +90,8 @@
"source": [ "source": [
"print(\"Original:\")\n", "print(\"Original:\")\n",
"print(orig_4_4)\n", "print(orig_4_4)\n",
"print(\"Subsampled:\")\n", "print(\"Downsampled:\")\n",
"print(subsample(orig_4_4))" "print(downsample(orig_4_4))"
], ],
"metadata": { "metadata": {
"id": "O_i0y72_JwGZ" "id": "O_i0y72_JwGZ"
@@ -127,24 +126,24 @@
"image = Image.open('test_image.png')\n", "image = Image.open('test_image.png')\n",
"# convert image to numpy array\n", "# convert image to numpy array\n",
"data = asarray(image)\n", "data = asarray(image)\n",
"data_subsample = subsample(data);\n", "data_downsample = downsample(data);\n",
"\n", "\n",
"plt.figure(figsize=(5,5))\n", "plt.figure(figsize=(5,5))\n",
"plt.imshow(data, cmap='gray')\n", "plt.imshow(data, cmap='gray')\n",
"plt.show()\n", "plt.show()\n",
"\n", "\n",
"plt.figure(figsize=(5,5))\n", "plt.figure(figsize=(5,5))\n",
"plt.imshow(data_subsample, cmap='gray')\n", "plt.imshow(data_downsample, cmap='gray')\n",
"plt.show()\n", "plt.show()\n",
"\n", "\n",
"data_subsample2 = subsample(data_subsample)\n", "data_downsample2 = downsample(data_downsample)\n",
"plt.figure(figsize=(5,5))\n", "plt.figure(figsize=(5,5))\n",
"plt.imshow(data_subsample2, cmap='gray')\n", "plt.imshow(data_downsample2, cmap='gray')\n",
"plt.show()\n", "plt.show()\n",
"\n", "\n",
"data_subsample3 = subsample(data_subsample2)\n", "data_downsample3 = downsample(data_downsample2)\n",
"plt.figure(figsize=(5,5))\n", "plt.figure(figsize=(5,5))\n",
"plt.imshow(data_subsample3, cmap='gray')\n", "plt.imshow(data_downsample3, cmap='gray')\n",
"plt.show()" "plt.show()"
], ],
"metadata": { "metadata": {
@@ -345,11 +344,11 @@
{ {
"cell_type": "code", "cell_type": "code",
"source": [ "source": [
"# Let's re-upsample, sub-sampled rick\n", "# Let's re-upsample, downsampled rick\n",
"data_duplicate = duplicate(data_subsample3);\n", "data_duplicate = duplicate(data_downsample3);\n",
"\n", "\n",
"plt.figure(figsize=(5,5))\n", "plt.figure(figsize=(5,5))\n",
"plt.imshow(data_subsample3, cmap='gray')\n", "plt.imshow(data_downsample3, cmap='gray')\n",
"plt.show()\n", "plt.show()\n",
"\n", "\n",
"plt.figure(figsize=(5,5))\n", "plt.figure(figsize=(5,5))\n",
@@ -388,7 +387,7 @@
"# The input x_high_res is the original high res image, from which you can deduce the position of the maximum index\n", "# The input x_high_res is the original high res image, from which you can deduce the position of the maximum index\n",
"def max_unpool(x_in, x_high_res):\n", "def max_unpool(x_in, x_high_res):\n",
" x_out = np.zeros(( x_in.shape[0]*2, x_in.shape[1]*2 ))\n", " x_out = np.zeros(( x_in.shape[0]*2, x_in.shape[1]*2 ))\n",
" # TODO -- write the subsampling routine\n", " # TODO -- write the unpooling routine\n",
" # Replace this line\n", " # Replace this line\n",
" x_out = x_out\n", " x_out = x_out\n",
"\n", "\n",
@@ -417,7 +416,7 @@
{ {
"cell_type": "code", "cell_type": "code",
"source": [ "source": [
"# Let's re-upsample, sub-sampled rick\n", "# Let's re-upsample, down-sampled rick\n",
"data_max_unpool= max_unpool(data_maxpool3,data_maxpool2);\n", "data_max_unpool= max_unpool(data_maxpool3,data_maxpool2);\n",
"\n", "\n",
"plt.figure(figsize=(5,5))\n", "plt.figure(figsize=(5,5))\n",
@@ -489,7 +488,7 @@
{ {
"cell_type": "code", "cell_type": "code",
"source": [ "source": [
"# Let's re-upsample, sub-sampled rick\n", "# Let's re-upsample, down-sampled rick\n",
"data_bilinear = bilinear(data_meanpool3);\n", "data_bilinear = bilinear(data_meanpool3);\n",
"\n", "\n",
"plt.figure(figsize=(5,5))\n", "plt.figure(figsize=(5,5))\n",
@@ -517,4 +516,4 @@
"outputs": [] "outputs": []
} }
] ]
} }