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ihaart2

Inverse 2-D Haar wavelet transform

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Syntax

xrec = ihaart2(a,h,v,d)
xrec = ihaart2(a,h,v,d,level)
xrec = ihaart2(___,integerflag)

Description

example

xrec= ihaart2(a,h,v,d)returns the inverse 2-D Haar transform,xrec, for the approximation coefficients,a， 和the horizontal, vertical, and diagonal detail coefficients,h,v， 和d. All the inputs,a,h,v， 和d, are outputs ofhaart2.

example

xrec= ihaart2(a,h,v,d,等级)returns the inverse 2-D Haar transform at the specified level.

example

xrec= ihaart2(___,integerflag)specifies how the inverse 2-D Haar transform handles integer-valued data, using any of the previous syntaxes.

Examples

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打开直播脚本

Obtain the inverse 2-D Haar transform of image and view the reconstructed image.

加载图像并获得其2-D Haar变换。

im = imread('mandrill.png'）;[a，h，v，d] = haart2（Im）;

使用inverse 2-D Haar transform to reconstruct the image.

xrec = ihaart2(a,h,v,d);

比较原始和重建的图像。

ImagesC（IM）标题（'Original RGB Image')

图包含轴对象。具有标题原始RGB图像的轴对象包含类型图像的对象。

图ImageC（UINT8（XREC））标题（'Reconstructed RGB Image')

图包含轴对象。具有标题重建RGB图像的轴对象包含类型图像的对象。

打开直播脚本

Obtain the 2-D Haar transform of an image limiting the transform to 2 levels.

Load and view the image of a cameraman.

im = imread('cameraman.tif'）;ImagesC（IM）

图包含轴对象。The axes object contains an object of type image.

使用默认最大级别获取2-D Haar变换。

[a，h，v，d] = haart2（Im）;

使用逆2-d Haar变换重建图像并查看图像。注意近乎完美的重建。

xrec = ihaart2(a,h,v,d); imagesc(xrec)

图包含轴对象。The axes object contains an object of type image.

使用逆2-d哈尔变换重建和查看图像，限于级别2.级别2对应于第四种比例，因为尺度被定义为 2 j , wherejis the level.

xrec1 = ihaart2(a,h,v,d,2); imagesc(xrec1)

图包含轴对象。The axes object contains an object of type image.

Using fewer levels returns the average of the original image at level 2.

打开直播脚本

Obtain the 2-D Haar transform of an image limiting the transform to integer data.

Load the image of a cameraman.

im = imread('cameraman.tif'）;

Obtain the 2-D Haar transform using the'整数'旗帜。

[a,h,v,d]=haart2(im,'整数'）;

使用逆2-d Haar变换重建图像并查看图像。

xrec = ihaart2(a,h,v,d,'整数'）;imagesc(xrec)

图包含轴对象。The axes object contains an object of type image.

Use integer data when you need to reduce the amount of memory used compared to noninteger data.

Input Arguments

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近似系数，指定为系数的标量或矩阵，这取决于计算2-D哈尔变换的电平。ais an output from thehaart2function. Approximation, or scaling, coefficients are a lowpass representation of the input. Ifa和the elements ofh,v， 和d向量,xrecis a vector. Ifa和the elements ofh,v， 和dare matrices,xrecis a matrix, where each column is the inverse 2-D Haar transform of the corresponding columns ina和h,v, ord.

Data Types:single|double

Horizontal detail coefficients by level, specified as a matrix or cell array of matrices.his an output from thehaart2function. Ifhis a matrix, the 2-D Haar transform was computed only down to one level coarser in resolution.

Data Types:single|double

Vertical detail coefficients by level, specified as a matrix or cell array of matrices.vis an output from thehaart2function. Ifvis a matrix, the 2-D Haar transform was computed only down to one level coarser in resolution.

Data Types:single|double

按级别的对角线细节系数，指定为矩阵或小区矩阵数组。dis an output from thehaart2function. Ifdis a matrix, the 2-D Haar transform was computed only down to one level coarser in resolution.

Data Types:single|double

最大水平to which to invert the Haar transform, specified as a nonnegative integer. Ifh是一个小区阵列，等级is less than or equal to长度（h）-1. Ifh是矢量或矩阵，等级must equal0或者be unspecified.

Integer-valued data handling, specified as either'noninteger'或者'整数'.'noninteger'does not preserve integer-valued data in the 2-D Haar transform, and'整数'preserves it. The'整数'option applies only if all elements of inputs,a,h,v， 和d, are integer-valued. The inverse 2-D Haar transform algorithm, however, uses floating-point arithmetic.

Output Arguments

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2-D Haar wavelet transform, returned as a matrix.

Data Types:single|double

Extended Capabilities

C/C++ Code Generation
使用MATLAB®Coder™生成C和C ++代码。

GPU Arrays
使用并行计算工具箱™在图形处理单元（GPU）上运行，加速代码。

Version History

Introduced in R2016b

See Also

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