Python+OpenCV：图像Shi-Tomasi角点检测器

迷南。 2022-12-23 09:58 117阅读 0赞

## Python+OpenCV：图像Shi-Tomasi角点检测器 ##

### 理论 ###

The scoring function in Harris Corner Detector was given by:

![20201124162443857.png][]  
Instead of this, Shi-Tomasi proposed:

![20201124162454530.png][]  
If it is a greater than a threshold value, it is considered as a corner. If we plot it in λ1−λ2 space as we did in Harris Corner Detector, we get an image as below:

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWJpbmc4NjA5_size_16_color_FFFFFF_t_70][]

### 示例 ###

####################################################################################################
    # 图像Shi-Tomasi角点检测(Shi-Tomasi Corner Detector)
    def lmc_cv_image_shi_tomasi_corner_detection():
        """
            函数功能: 图像Shi-Tomasi角点检测(Shi-Tomasi Corner Detector)。
        """
    
        stacking_images = []
        image_file_name = ['D:/99-Research/Python/Image/CheckerBoard.jpg',
                           'D:/99-Research/Python/Image/CheckerBoard02.jpg',
                           'D:/99-Research/Python/Image/CheckerBoard04.jpg',
                           'D:/99-Research/Python/Image/CheckerBoard07.jpg']
        for i in range(len(image_file_name)):
            # 读取图像
            image = lmc_cv.imread(image_file_name[i])
            image = lmc_cv.cvtColor(image, lmc_cv.COLOR_BGR2RGB)
            result_image = image.copy()
            gray_image = lmc_cv.cvtColor(image, lmc_cv.COLOR_BGR2GRAY)
    
            # find Shi-Tomasi corners
            corners = lmc_cv.goodFeaturesToTrack(gray_image, 25, 0.001, 10)
            corners = np.int0(corners)
            # Now draw them
            for j in range(len(corners)):
                x, y = corners[j].ravel()
                lmc_cv.circle(result_image, center=(x, y), radius=5, color=(255, 0, 255), thickness=3,
                              lineType=lmc_cv.LINE_8, shift=0)
    
            # stacking images side-by-side
            stacking_image = np.hstack((image, result_image))
            stacking_images.append(stacking_image)
    
        # 显示图像
        for i in range(len(stacking_images)):
            pyplot.figure('Shi-Tomasi Corner Detection %d' % (i + 1))
            pyplot.subplot(1, 1, 1)
            pyplot.imshow(stacking_images[i], 'gray')
            pyplot.xticks([])
            pyplot.yticks([])
        pyplot.show()
    
        # 根据用户输入保存图像
        if ord("q") == (lmc_cv.waitKey(0) & 0xFF):
            # 销毁窗口
            pyplot.close('all')
        return

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWJpbmc4NjA5_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWJpbmc4NjA5_size_16_color_FFFFFF_t_70 2][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWJpbmc4NjA5_size_16_color_FFFFFF_t_70 3][]

[20201124162443857.png]: /images/20221120/a6c4c19899e749cea0bcd9978657a613.png
[20201124162454530.png]: /images/20221120/532be9085d34418eaa131687f221c2ec.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWJpbmc4NjA5_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20201124162520581.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWJpbmc4NjA5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWJpbmc4NjA5_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20201124164514150.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWJpbmc4NjA5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWJpbmc4NjA5_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20201124164523499.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWJpbmc4NjA5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWJpbmc4NjA5_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20201124164723593.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWJpbmc4NjA5,size_16,color_FFFFFF,t_70