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DFT&DCT

于 2021-01-18 发布文件大小:3KB

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下载积分: 1 下载次数: 25

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代码说明：

编程实现二维8*8图像块的DFT，DCT变换输入一副RGB图像，将其转化为YCbCr颜色空间，然后对Y分量做分块DFT变换，保存为灰度图像，统计计算时间编程实现8*8块DCT变换,然后分别显示，当使用64个DCT系数里面的一些系数进行重构，比较其质量；同时熟悉采用FFT来实现DCT变换的思想，并显示2维8*8DCT变换的基函数图像(Programming the DFT, DCT transform of two dimensional 8*8 image block Input a pair of RGB images, transform it into YCbCr color space, then divide the Y component into block DFT transform, save as gray image, and calculate the calculation time The 8*8 block DCT transform is implemented by programming, and then it is shown that when using some coefficients in 64 DCT coefficients, the quality is reconstructed. Meanwhile, the idea of DCT transformation is familiar with FFT, and the base function image of the 2 dimensional 8*8DCT transform is displayed.)

文件列表：

代码
代码\DCT0.m, 151, 2017-12-05
代码\DCT1.m, 891, 2017-12-05
代码\DCT2.m, 321, 2017-12-05
代码\dft1.m, 392, 2017-12-05
代码\fft2.m, 1711, 2017-12-04
代码\lena88.bmp, 246, 2017-12-04
代码\RGB2YCbCr.m, 479, 2017-12-05
代码\RGB2YCbCr_2.m, 316, 2017-12-05
代码\showBase.m, 555, 2017-12-05

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2012-03-09 22:01:01下载

积分：1
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2020-06-20 05:00:01下载

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2016-10-17 15:13:00下载

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2020-12-01 11:39:27下载

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2012-03-29 15:57:20下载

积分：1
DWT2D
对图像进行二维离散小波变换, 变换级数大于等于3级,然后进行阈值化处理(阈值约为10左右),再统计系数中0的个数（百分比表示）并进行重构, 最后计算重构图像的峰值信噪比(PSNR). (Two-dimensional discrete wavelet transform image transformed series is greater than or equal to 3, and then processing thresholding (threshold of about 10 or so), then statistical coefficient in the number (expressed as a percentage) and to reconstruct the final calculation reconstructed image of the peak signal-to-noise ratio (PSNR).)

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2007-03-22 21:34:01下载

积分：1

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