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"b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/config.json" @@ -2,5 +2,9 @@ "node_id": "opencv-04cf975c42894174bd5619ed44ea5e87", "keywords": [], "children": [], - "export": [] + "export": [ + "img_read_write.json", + "video_read_write.json", + "img_buffer_convert.json" + ] } \ No newline at end of file diff --git "a/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_buffer_convert.json" "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_buffer_convert.json" new file mode 100644 index 0000000000000000000000000000000000000000..fdda203634da2c6660e0b868a9e651f1d4bdd41e --- /dev/null +++ "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_buffer_convert.json" @@ -0,0 +1,6 @@ +{ + "type": "code_options", + "author": "huanhuilong", + "source": "img_buffer_convert.md", + "notebook_enable": true +} \ No newline at end of file diff --git "a/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_buffer_convert.md" "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_buffer_convert.md" new file mode 100644 index 0000000000000000000000000000000000000000..8a49be90e806e6aa326fdbd33182cba12fc730ed --- /dev/null +++ "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_buffer_convert.md" @@ -0,0 +1,83 @@ +# 甲壳虫的Base64之旅 + +如下的一只甲壳虫，我们希望把它编码成 Base64，再从Base64解码出来。 +![](./bug.jpg) + +代码框架如下： + +```python +import numpy as np +import cv2 +import base64 + +def img_to_base64(img): + # TODO(You): + +def img_from_base64(img_base64): + # TODO(You): + +if __name__ == '__main__': + img = cv2.imread('bug.jpg') + + img_base64 = img_to_base64(img) + img = img_from_base64(img_base64) + + cv2.imshow('img_decode', img) + cv2.waitKey() + cv2.destroyAllWindows() +``` + +以下对两个函数实现正确的是？ + +## 答案 + +```python +def img_to_base64(img): + return base64.b64encode(cv2.imencode('.jpg', img)[1]).decode() + +def img_from_base64(img_base64): + jpg_original = base64.b64decode(img_base64) + jpg_as_np = np.frombuffer(jpg_original, dtype=np.uint8) + img = cv2.imdecode(jpg_as_np, flags=1) + return img +``` + +## 选项 + +### A + +```python +def img_to_base64(img): + return base64.b64encode(cv2.imencode('.jpg', img)[1]) + +def img_from_base64(img_base64): + jpg_original = base64.b64decode(img_base64) + img = cv2.imdecode(jpg_original, flags=1) + return img +``` + +### B + +```python +def img_to_base64(img): + return base64.b64encode(cv2.imencode('.jpg', img)).decode() + +def img_from_base64(img_base64): + jpg_original = base64.b64decode(img_base64) + jpg_as_np = np.frombuffer(jpg_original, dtype=np.uint8) + img = cv2.imdecode(jpg_as_np, flags=1) + return img +``` + +### C + +```python +def img_to_base64(img): + return base64.b64encode(cv2.imencode('.jpg', img)[1]).decode() + +def img_from_base64(img_base64): + jpg_original = base64.b64decode(img_base64) + jpg_as_np = np.frombuffer(jpg_original) + img = cv2.imdecode(jpg_as_np, flags=1) + return img +``` diff --git "a/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_buffer_convert.py" "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_buffer_convert.py" new file mode 100644 index 0000000000000000000000000000000000000000..7f55a966f1bb7ec260681484a224292727be454a --- /dev/null +++ "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_buffer_convert.py" @@ -0,0 +1,26 @@ +# -*- coding: utf-8 -*- +import numpy as np +import cv2 +import base64 + + +def img_to_base64(img): + return base64.b64encode(cv2.imencode('.jpg', img)[1]).decode() + + +def img_from_base64(img_base64): + jpg_original = base64.b64decode(img_base64) + jpg_as_np = np.frombuffer(jpg_original, dtype=np.uint8) + img = cv2.imdecode(jpg_as_np, flags=1) + return img + + +if __name__ == '__main__': + img = cv2.imread('bug.jpg') + + img_base64 = img_to_base64(img) + img = img_from_base64(img_base64) + + cv2.imshow('img_decode', img) + cv2.waitKey() + cv2.destroyAllWindows() diff --git "a/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_read_wirte.json" "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_read_wirte.json" new file mode 100644 index 0000000000000000000000000000000000000000..a68d89b552756d5a14d4e622f82926073e767917 --- /dev/null +++ "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_read_wirte.json" @@ -0,0 +1,6 @@ +{ + "type": "code_options", + "author": "huanhuilong", + "source": "img_read_write.md", + "notebook_enable": true +} \ No newline at end of file diff --git "a/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_read_write.md" "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_read_write.md" new file mode 100644 index 0000000000000000000000000000000000000000..9ef32fb1c3b19525ea5fb44fc22d0e842b434702 --- /dev/null +++ "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_read_write.md" @@ -0,0 +1,102 @@ +# 甲壳虫乐队 + +一只甲壳虫想组个乐队，但是临时找不到队友。请使用 OpenCV 读取下面的彩色甲壳虫图片 `'bug.jpg'`，帮助他变身灰色甲壳虫，然后完成组队。 +![](./bug.jpg) + +**显示甲壳虫乐队并写入到 `'bug_band.jpg'`**： +![](./bug_band.jpg) + +以下实现正确的是？ + +## 答案 + +```python +import numpy as np +import cv2 + +if __name__ == '__main__': + bug_img = cv2.imread("bug.jpg") + bug_img_gray = cv2.cvtColor(bug_img, cv2.COLOR_BGR2GRAY) + + bug_img_gray_by_BGR_space = cv2.cvtColor(bug_img_gray, cv2.COLOR_GRAY2BGR) + bug_img_concat = np.concatenate( + (bug_img, bug_img_gray_by_BGR_space), + axis=1 + ) + cv2.imwrite("bug_band.jpg", bug_img_gray) + + cv2.imshow('甲壳虫乐队', bug_img_concat) + + cv2.waitKey(0) + cv2.destroyAllWindows() +``` + +## 选项 + +### 读写api名字错误 + +```python +import numpy as np +import cv2 + +if __name__ == '__main__': + bug_img = cv2.read("bug.jpg") + bug_img_gray = cv2.cvtColor(bug_img, cv2.COLOR_BGR2GRAY) + + bug_img_gray_by_BGR_space = cv2.cvtColor(bug_img_gray, cv2.COLOR_GRAY2BGR) + bug_img_concat = np.concatenate( + (bug_img, bug_img_gray_by_BGR_space), + axis=1 + ) + cv2.write("bug_band.jpg", bug_img_gray) + + cv2.imshow('甲壳虫乐队', bug_img_concat) + + cv2.waitKey(0) + cv2.destroyAllWindows() +``` + +### 写入参数顺序错误 + +```python +import numpy as np +import cv2 + +if __name__ == '__main__': + bug_img = cv2.imread("bug.jpg") + bug_img_gray = cv2.cvtColor(bug_img, cv2.COLOR_BGR2GRAY) + + bug_img_gray_by_BGR_space = cv2.cvtColor(bug_img_gray, cv2.COLOR_GRAY2BGR) + bug_img_concat = np.concatenate( + (bug_img, bug_img_gray_by_BGR_space), + axis=1 + ) + cv2.imwrite(bug_img_gray, "bug_band.jpg") + + cv2.imshow('甲壳虫乐队', bug_img_concat) + + cv2.waitKey(0) + cv2.destroyAllWindows() +``` + +### 不能合并彩色和灰色，尺寸不同 + +```python +import numpy as np +import cv2 + +if __name__ == '__main__': + bug_img = cv2.imread("bug.jpg") + bug_img_gray = cv2.cvtColor(bug_img, cv2.COLOR_BGR2GRAY) + + bug_img_concat = np.concatenate( + (bug_img, bug_img_gray), + axis=1 + ) + cv2.imwrite("bug_img_concat.jpg", bug_img_concat) + + cv2.imshow('甲壳虫乐队', bug_img_gray) + + cv2.waitKey(0) + cv2.destroyAllWindows() +``` diff --git "a/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_read_write.py" "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_read_write.py" new file mode 100644 index 0000000000000000000000000000000000000000..6c19d168e4af3c655ca30e2614c6932799c4ed4b --- /dev/null +++ "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/img_read_write.py" @@ -0,0 +1,18 @@ +import numpy as np +import cv2 + +if __name__ == '__main__': + bug_img = cv2.imread("bug.jpg") + bug_img_gray = cv2.cvtColor(bug_img, cv2.COLOR_BGR2GRAY) + + bug_img_gray_by_BGR_space = cv2.cvtColor(bug_img_gray, cv2.COLOR_GRAY2BGR) + bug_img_concat = np.concatenate( + (bug_img, bug_img_gray_by_BGR_space), + axis=1 + ) + cv2.imwrite("bug_band.jpg", bug_img_gray) + + cv2.imshow('甲壳虫乐队', bug_img_concat) + + cv2.waitKey(0) + cv2.destroyAllWindows() diff --git "a/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/video_read_write.json" "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/video_read_write.json" new file mode 100644 index 0000000000000000000000000000000000000000..dea237cb6da5032c15b16f506cd07af4e06ab430 --- /dev/null +++ "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/video_read_write.json" @@ -0,0 +1,6 @@ +{ + "type": "code_options", + "author": "huanhuilong", + "source": "video_read_write.md", + "notebook_enable": true +} \ No newline at end of file diff --git "a/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/video_read_write.md" "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/video_read_write.md" new file mode 100644 index 0000000000000000000000000000000000000000..13d7118710891c102127b4628bc1637ee9e41af0 --- /dev/null +++ "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/video_read_write.md" @@ -0,0 +1,104 @@ +# 早起的鸟儿有虫吃 + +早起的鸟儿不但有虫吃，还可以照镜子。请你帮助鸟儿们跟镜像合影。 + +这是鸟儿的视频： + + +这是合影的效果： + + +基本的实现代码如下： + +```python +import numpy as np +import cv2 + +if __name__ == '__main__': + cap = cv2.VideoCapture('birds.mp4') + + out = ... + # TODO(You): 请在此正确创建待保存的目标mp4文件`out` + + while(cap.isOpened()): + + ret, bird_frame = cap.read() + if bird_frame is None: + break + + bird_flip_frame = cv2.flip(bird_frame, 0) + bird_concat_frame = np.concatenate( + (bird_frame, bird_flip_frame), + axis=1 + ) + + cv2.imshow('bird_concat_frame', bird_concat_frame) + out.write(bird_concat_frame) + if cv2.waitKey(1) & 0xFF == ord('q'): + break + + out.release() + cap.release() + + cv2.destroyAllWindows() +``` + +以下正确创建了输出mp4文件`out`变量的是？ + +## 答案 + +```python +width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)) +height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)) +fps = cap.get(cv2.CAP_PROP_FPS) +out = cv2.VideoWriter( + 'birds_concat.mp4', + cv2.VideoWriter_fourcc(*'mp4v'), + fps, + (width*2, height) +) +``` + +## 选项 + +### 宽度不对 + +```python +width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)) +height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)) +fps = cap.get(cv2.CAP_PROP_FPS) +out = cv2.VideoWriter( + 'birds_concat.mp4', + cv2.VideoWriter_fourcc(*'mp4v'), + fps, + (width, height) +) +``` + +### 格式不对 + +```python +width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)) +height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)) +fps = cap.get(cv2.CAP_PROP_FPS) +out = cv2.VideoWriter( + 'birds_concat.mp4', + cv2.VideoWriter_fourcc(*'MP4V'), + fps, + (width, height) +) +``` + +### 宽度和长度类型不对 + +```python +width = cap.get(cv2.CAP_PROP_FRAME_WIDTH) +height = cap.get(cv2.CAP_PROP_FRAME_HEIGHT) +fps = cap.get(cv2.CAP_PROP_FPS) +out = cv2.VideoWriter( + 'birds_concat.mp4', + cv2.VideoWriter_fourcc(*'MP4V'), + fps, + (width, height) +) +``` diff --git "a/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/video_read_write.py" "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/video_read_write.py" new file mode 100644 index 0000000000000000000000000000000000000000..655b4476ac03196fd4248f4d4406f3cc013f60e1 --- /dev/null +++ "b/data/1.OpenCV\345\210\235\351\230\266/1.OpenCV\345\237\272\347\241\200/4.IO\344\270\216GUI/video_read_write.py" @@ -0,0 +1,38 @@ +import numpy as np +import cv2 + + +if __name__ == '__main__': + cap = cv2.VideoCapture('birds.mp4') + + width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)) + height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)) + fps = cap.get(cv2.CAP_PROP_FPS) + out = cv2.VideoWriter( + 'birds_concat.mp4', + cv2.VideoWriter_fourcc(*'mp4v'), + fps, + (width*2, height) + ) + + while(cap.isOpened()): + + ret, bird_frame = cap.read() + if bird_frame is None: + break + + bird_flip_frame = cv2.flip(bird_frame, 0) + bird_concat_frame = np.concatenate( + (bird_frame, bird_flip_frame), + axis=1 + ) + + cv2.imshow('bird_concat_frame', bird_concat_frame) + out.write(bird_concat_frame) + if cv2.waitKey(1) & 0xFF == ord('q'): + break + + out.release() + cap.release() + + cv2.destroyAllWindows()