Picture batch download + picture mosaic: multiple pictures constitute the Dragon Boat Festival Ankang!

 
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Preface

Some time ago I saw someone ask how to use Python Realization Multiple pictures form text The effect of ？ I think it's very interesting , So I tried to do it , Just in time for the Dragon Boat Festival , So I plan to download it from the Internet 1000 A photo of Wang Xinling , The Dragon Boat Festival is composed of the words "well-being" , Send you blessings .

One 、 Image bulk download

First of all, we need to download a large number of Wang Xinling's pictures from Baidu , But if you will go to Baidu pictures and right-click to download them , But it's too much trouble , So I plan to use it directly python Write a batch download image code , Enter the keyword you want to download the picture , Then enter the number of images you want to download , You can download the pictures successfully ！

The code is mainly divided into three parts ：

1. Download the pictures
2. Number of detected pictures
3. Look for similar pictures

1. Download the pictures

def dowmloadPicture(html, keyword):
    global num
    # t =0
    pic_url = re.findall('"objURL":"(.*?)",', html, re.S)  #  First, use regular expressions to find pictures url
    print(' Find keywords :' + keyword + ' Pictures of the , About to start downloading pictures ...')
    for each in pic_url:
        print(' Downloading section ' + str(num + 1) + ' A picture , Picture address :' + str(each))
        try:
            if each is not None:
                pic = requests.get(each, timeout=7)
            else:
                continue
        except BaseException:
            print(' error , The current picture cannot be downloaded ')
            continue
        else:
            string = file + r'\\' + keyword + '_' + str(num) + '.jpg'
            fp = open(string, 'wb')
            fp.write(pic.content)
            fp.close()
            num += 1
        if num >= numPicture:
            return

2. Number of detected pictures

def Find(url, A):
    global List
    print(' Detecting total number of pictures , One moment please .....')
    t = 0
    i = 1
    s = 0
    while t < 1000:
        Url = url + str(t)
        try:
            #  There's been a little bit of 
            Result = A.get(Url, timeout=7, allow_redirects=False)
        except BaseException:
            t = t + 60
            continue
        else:
            result = Result.text
            pic_url = re.findall('"objURL":"(.*?)",', result, re.S)  #  First, use regular expressions to find pictures url
            s += len(pic_url)
            if len(pic_url) == 0:
                break
            else:
                List.append(pic_url)
                t = t + 60
    return s

3. Look for similar pictures

def dowmloadPicture(html, keyword):
    global num
    # t =0
    pic_url = re.findall('"objURL":"(.*?)",', html, re.S)  #  First, use regular expressions to find pictures url
    print(' Find keywords :' + keyword + ' Pictures of the , About to start downloading pictures ...')
    for each in pic_url:
        print(' Downloading section ' + str(num + 1) + ' A picture , Picture address :' + str(each))
        try:
            if each is not None:
                pic = requests.get(each, timeout=7)
            else:
                continue
        except BaseException:
            print(' error , The current picture cannot be downloaded ')
            continue
        else:
            string = file + r'\\' + keyword + '_' + str(num) + '.jpg'
            fp = open(string, 'wb')
            fp.write(pic.content)
            fp.close()
            num += 1
        if num >= numPicture:
            return

Use effect ：

 

Two 、 Picture mosaic

When we have downloaded the required photos of Wang Xinling , Next we need to use these pictures to form the text we need .

So first prepare a picture to be assembled , For example, the words that need to be composed , Such as the Dragon Boat Festival , We can use PowerPoint） Make a favorite text style , And save it as jpg Format .

1. Use photomosaic Library to achieve picture mosaic

The code is as follows ：

import photomosaic as pm

#  Load the picture to be assembled image（jpg  Format , The bigger the picture , The higher the resolution of each small picture of the puzzle ）
image = pm.imread("1.jpg", as_gray=False)
#  Load the picture library from the specified folder （ You need more pictures to get better results ）
pool = pm.make_pool("wxl/*.jpg")
#  Make  50*50  A mosaic of jigsaw puzzles 
mosaic = pm.basic_mosaic(image, pool, (200, 200))
#  Save puzzle 
pm.imsave("mosaic.jpg", mosaic)

  However, due to the library version problem , So you need to make a little change in the library function to run successfully .

def crop_to_fit(image, shape):
    """
    Return a copy of image resized and cropped to precisely fill a shape.

    To resize a colored 2D image, pass in a shape with two entries. When
    ``len(shape) < image.ndim``, higher dimensions are ignored.

    Parameters
    ----------
    image : array
    shape : tuple
        e.g., ``(height, width)`` but any length <= ``image.ndim`` is allowed

    Returns
    -------
    cropped_image : array
    """
    # Resize smallest dimension (width or height) to fit.
    d = np.argmin(np.array(image.shape)[:2] / np.array(shape))
    enlarged_shape = (tuple(np.ceil(np.array(image.shape[:len(shape)]) *
                                    shape[d]/image.shape[d])) +
                      image.shape[len(shape):])
    resized = resize(image, enlarged_shape,
                     mode='constant', anti_aliasing=False)
    # Now the image is as large or larger than the shape along all dimensions.
    # Crop any overhang in the other dimension.
    crop_width = []
    for actual, target in zip(resized.shape, shape):
        overflow = actual - target
        # Center the image and crop, biasing left if overflow is odd.
        left_margin = int(np.floor(overflow / 2))
        right_margin = int(np.ceil(overflow / 2))
        crop_width.append((left_margin, right_margin))
    # Do not crop any additional dimensions beyond those given in shape.
    for _ in range(resized.ndim - len(shape)):
        crop_width.append((0, 0))
    cropped = crop(resized, crop_width)
    return cropped

When cutting the picture, the input needs to be int type , So the left_margin and right_margin Force into int type .

Realization effect ：

The effect is really average , Local magnification , It can be observed that , The generated image is composed of photos , Therefore, the sharpness of the overall large picture is also related to the number of small photos , It is also possible that the resolution and size of the picture are different , So I tried another method .

2. Calculate color similarity to realize picture mosaic

def readSourceImages(sourcepath,blocksize):
    print(' Start reading image ')
    #  List of legal images 
    sourceimages = []
    #  Average color list 
    avgcolors = []
    for path in tqdm(glob.glob("{}/*.jpg".format(sourcepath))):
        image = cv2.imread(path, cv2.IMREAD_COLOR)
        if image.shape[-1] != 3:
            continue
        image = cv2.resize(image, (blocksize, blocksize))
        avgcolor = np.sum(np.sum(image, axis=0), axis=0) / (blocksize * blocksize)
        sourceimages.append(image)
        avgcolors.append(avgcolor)
    print(' End read ')
    return sourceimages,np.array(avgcolors)

This method can obtain the color similarity between each photo in the photo set and the large picture , Put similar photos in the corresponding positions .

Realization effect ：

I feel the effect is better than before , But it is not clear enough .

Another article 2 ten thousand 8 How to use thousands of pictures python Make up a self portrait of your girlfriend ！ Rendering made ：

Felt the effect was much better , Maybe it's because the resolution of text and image is not high enough .

summary

This time How to realize the effect of text composed of multiple pictures by using batch downloading of pictures and picture mosaic , I hope you can support me a lot , If you have any questions, you can leave a message in the comment area to discuss .

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Reference resources ：

​​​​​​​​​​​​​Python A series of crawler tutorials crawl a batch of Baidu pictures

How to use Python To make a , Many, many pictures make up the effect of text ?

2 ten thousand 8 How to use thousands of pictures python Make up a self portrait of your girlfriend ！