能写一个提取指纹中心点的matlab代码吗？基于方向场

以下是一个基于方向场提取指纹中心点的 MATLAB 代码示例：

% Load the fingerprint image
fingerprint = imread('fingerprint.png');

% Enhance the fingerprint image using a Gabor filter
wavelength = 10;
orientation = pi/6;
[mag, phase] = imgaborfilt(fingerprint, wavelength, orientation);

% Compute the orientation field using the phase of the Gabor filter output
orientation_field = mod(phase, pi);

% Compute the ridge frequency using the wavelength of the Gabor filter output
ridge_frequency = 1/wavelength;

% Compute the ridge phase using the orientation field and the ridge frequency
ridge_phase = cos(2*orientation_field) .* mag;

% Compute the gradient of the ridge phase to obtain the ridge flow field
[ridge_flow_x, ridge_flow_y] = gradient(ridge_phase);

% Compute the center of the fingerprint by finding the point with the highest ridge flow magnitude
ridge_flow_magnitude = sqrt(ridge_flow_x.^2 + ridge_flow_y.^2);
[~, max_index] = max(ridge_flow_magnitude(:));
[max_x, max_y] = ind2sub(size(ridge_flow_magnitude), max_index);

% Plot the fingerprint image and the computed center point
imshow(fingerprint);
hold on;
plot(max_y, max_x, 'r+', 'MarkerSize', 10, 'LineWidth', 2);
hold off;

该代码首先加载指纹图像，然后使用 Gabor 滤波器增强指纹图像。接下来，它使用 Gabor 滤波器输出的相位计算方向场。然后，它使用 Gabor 滤波器输出的波长计算脊频率，并使用方向场和脊频率计算脊相位。接下来，它使用脊相位计算脊流场，并找到流场幅度最大的点作为指纹中心点。最后，它将指纹图像和计算的中心点绘制在一起。