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[MXNET-1180] Java Image API (apache#13807)
* add java example * add test and change PredictorExample * add image change * Add minor fixes * add License * add predictor Example tests * fix the issue with JUnit test * Satisfy Lint God ʕ •ᴥ•ʔ * update the pom file config * update documentation * add simplified methods
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114 changes: 114 additions & 0 deletions
114
scala-package/core/src/main/scala/org/apache/mxnet/javaapi/Image.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to You under the Apache License, Version 2.0 | ||
| * (the "License"); you may not use this file except in compliance with | ||
| * the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
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| package org.apache.mxnet.javaapi | ||
| // scalastyle:off | ||
| import java.awt.image.BufferedImage | ||
| // scalastyle:on | ||
| import java.io.InputStream | ||
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| object Image { | ||
| /** | ||
| * Decode image with OpenCV. | ||
| * Note: return image in RGB by default, instead of OpenCV's default BGR. | ||
| * @param buf Buffer containing binary encoded image | ||
| * @param flag Convert decoded image to grayscale (0) or color (1). | ||
| * @param toRGB Whether to convert decoded image | ||
| * to mxnet's default RGB format (instead of opencv's default BGR). | ||
| * @return NDArray in HWC format with DType [[DType.UInt8]] | ||
| */ | ||
| def imDecode(buf: Array[Byte], flag: Int, toRGB: Boolean): NDArray = { | ||
| org.apache.mxnet.Image.imDecode(buf, flag, toRGB, None) | ||
| } | ||
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| def imDecode(buf: Array[Byte]): NDArray = { | ||
| imDecode(buf, 1, true) | ||
| } | ||
|
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| /** | ||
| * Same imageDecode with InputStream | ||
| * | ||
| * @param inputStream the inputStream of the image | ||
| * @param flag Convert decoded image to grayscale (0) or color (1). | ||
| * @param toRGB Whether to convert decoded image | ||
| * @return NDArray in HWC format with DType [[DType.UInt8]] | ||
| */ | ||
| def imDecode(inputStream: InputStream, flag: Int, toRGB: Boolean): NDArray = { | ||
| org.apache.mxnet.Image.imDecode(inputStream, flag, toRGB, None) | ||
| } | ||
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| def imDecode(inputStream: InputStream): NDArray = { | ||
| imDecode(inputStream, 1, true) | ||
| } | ||
|
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| /** | ||
| * Read and decode image with OpenCV. | ||
| * Note: return image in RGB by default, instead of OpenCV's default BGR. | ||
| * @param filename Name of the image file to be loaded. | ||
| * @param flag Convert decoded image to grayscale (0) or color (1). | ||
| * @param toRGB Whether to convert decoded image to mxnet's default RGB format | ||
| * (instead of opencv's default BGR). | ||
| * @return org.apache.mxnet.NDArray in HWC format with DType [[DType.UInt8]] | ||
| */ | ||
| def imRead(filename: String, flag: Int, toRGB: Boolean): NDArray = { | ||
| org.apache.mxnet.Image.imRead(filename, Some(flag), Some(toRGB), None) | ||
| } | ||
|
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| def imRead(filename: String): NDArray = { | ||
| imRead(filename, 1, true) | ||
| } | ||
|
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| /** | ||
| * Resize image with OpenCV. | ||
| * @param src source image in NDArray | ||
| * @param w Width of resized image. | ||
| * @param h Height of resized image. | ||
| * @param interp Interpolation method (default=cv2.INTER_LINEAR). | ||
| * @return org.apache.mxnet.NDArray | ||
| */ | ||
| def imResize(src: NDArray, w: Int, h: Int, interp: Integer): NDArray = { | ||
| val interpVal = if (interp == null) None else Some(interp.intValue()) | ||
| org.apache.mxnet.Image.imResize(src, w, h, interpVal, None) | ||
| } | ||
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| def imResize(src: NDArray, w: Int, h: Int): NDArray = { | ||
| imResize(src, w, h, null) | ||
| } | ||
|
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| /** | ||
| * Do a fixed crop on the image | ||
| * @param src Src image in NDArray | ||
| * @param x0 starting x point | ||
| * @param y0 starting y point | ||
| * @param w width of the image | ||
| * @param h height of the image | ||
| * @return cropped NDArray | ||
| */ | ||
| def fixedCrop(src: NDArray, x0: Int, y0: Int, w: Int, h: Int): NDArray = { | ||
| org.apache.mxnet.Image.fixedCrop(src, x0, y0, w, h) | ||
| } | ||
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| /** | ||
| * Convert a NDArray image to a real image | ||
| * The time cost will increase if the image resolution is big | ||
| * @param src Source image file in RGB | ||
| * @return Buffered Image | ||
| */ | ||
| def toImage(src: NDArray): BufferedImage = { | ||
| org.apache.mxnet.Image.toImage(src) | ||
| } | ||
| } |
67 changes: 67 additions & 0 deletions
67
scala-package/core/src/test/java/org/apache/mxnet/javaapi/ImageTest.java
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| @@ -0,0 +1,67 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to You under the Apache License, Version 2.0 | ||
| * (the "License"); you may not use this file except in compliance with | ||
| * the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
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| package org.apache.mxnet.javaapi; | ||
|
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| import org.apache.commons.io.FileUtils; | ||
| import org.junit.BeforeClass; | ||
| import org.junit.Test; | ||
| import java.io.File; | ||
| import java.net.URL; | ||
|
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| import static org.junit.Assert.assertArrayEquals; | ||
|
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| public class ImageTest { | ||
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| private static String imLocation; | ||
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| private static void downloadUrl(String url, String filePath, int maxRetry) throws Exception{ | ||
| File tmpFile = new File(filePath); | ||
| Boolean success = false; | ||
| if (!tmpFile.exists()) { | ||
| while (maxRetry > 0 && !success) { | ||
| try { | ||
| FileUtils.copyURLToFile(new URL(url), tmpFile); | ||
| success = true; | ||
| } catch(Exception e){ | ||
| maxRetry -= 1; | ||
| } | ||
| } | ||
| } else { | ||
| success = true; | ||
| } | ||
| if (!success) throw new Exception("$url Download failed!"); | ||
| } | ||
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| @BeforeClass | ||
| public static void downloadFile() throws Exception { | ||
| String tempDirPath = System.getProperty("java.io.tmpdir"); | ||
| imLocation = tempDirPath + "/inputImages/Pug-Cookie.jpg"; | ||
| downloadUrl("https://s3.amazonaws.com/model-server/inputs/Pug-Cookie.jpg", | ||
| imLocation, 3); | ||
| } | ||
|
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| @Test | ||
| public void testImageProcess() { | ||
| NDArray nd = Image.imRead(imLocation, 1, true); | ||
| assertArrayEquals(nd.shape().toArray(), new int[]{576, 1024, 3}); | ||
| NDArray nd2 = Image.imResize(nd, 224, 224, null); | ||
| assertArrayEquals(nd2.shape().toArray(), new int[]{224, 224, 3}); | ||
| NDArray cropped = Image.fixedCrop(nd, 0, 0, 224, 224); | ||
| Image.toImage(cropped); | ||
| } | ||
| } |
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