峰值信噪比matlab

峰值信噪比（PSNR）是一种用来衡量图像质量的指标，在MATLAB中可以通过编写代码来计算。以下是一个计算PSNR的MATLAB函数示例：

function [output = PSNR(img1, img2)
    if sum(sum(img1 - img2)) == 0
        error('Those pictures are the same');
    end
    MAX = 1; % 图像有多少灰度级（我这里定为1）
    
    % 归一化
    if (max(max(img1)) - min(min(img1))) ~= 0
        img1 = (img1 - min(min(img1))) ./ (max(max(img1)) - min(min(img1)));
    end
    
    if (max(max(img2)) - min(min(img2))) ~= 0
        img2 = (img2 - min(min(img2))) ./ (max(max(img2)) - min(min(img2)));
    end
    
    MSE = sum(sum((img1 - img2).^2)) / (1024 * 1024); % 图片像素设为1024 x 1024
    output = 20 * log10(MAX / sqrt(MSE)); % 峰值信噪比
end

你可以将需要计算PSNR的两幅图像作为参数传递给这个函数，函数将返回对应的PSNR值。请注意，这段代码是一个示例，你可能需要根据实际需求进行适当的修改和调整。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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