Image Resampling Library

This is a simple yet flexible image resampling library that supports the following image samplers:

• Nearest
• Average
• Bilinear
• Gaussian
• Bicubic
• Catmull-Rom
• Mitchell-Netravali
• Cardinal
• B-Spline
• Spline
• Lanczos
• Lanczos-2
• Lanczos-3
• Lanczos-4
• Lanczos-5
• Coverage

This library supports each separable sampler in both a two-pass 1D and 2D flavor. All resampling operations also support
size constraints (e.g. symmetric or pow-2 dimensions) and pad-filling. For more information about these filters, visit this blog post.

Supported Formats

Supported image formats may select between the following parameters:

• Fixed or Float
• Up to 4 channels
• Up to 32 bits per channel
• Small or big endian
• Signed or unsigned

The library uses a descriptive image format system, making it trivial to add new formats simply by inserting a valid new descriptor into the format list. The library also provides support for converting between formats. The following image formats are supported out of the box:

• R8
• R16
• D16
• R24
• D32
• R32
• R3G3B2
• R5G6B5
• R5G5B5A1
• R4G4B4A4
• R8G8B8
• R16G16B16
• R32G32B32
• R8G8B8A8
• R10G10B10A2
• R16G16B16A16
• R32G32B32A32
• R8S
• R16S
• R32S
• R8G8B8S
• R16G16B16S
• R32G32B32S
• R16F
• R32F
• R32G32F
• R16G16B16F
• R32G32B32F
• R16G16B16A16F
• R32G32B32A32F

Usage

(Taken from Tutorial.cpp in the \Source folder):

CVImage source_image;
CVImage resampled_image;

if ( VN_FAILED( vnCreateImage( VN_IMAGE_FORMAT_R8G8B8, 
                               640, 
							   480, 
							   &source_image ) ) )
{
    printf( "Error! Unable to create the source image." );
    return -1;
}

// TODO(you): Copy 640x480 RGB image data into source_image->QueryData(). 

if ( VN_FAILED( vnResizeImage( source_image, 
                               VN_IMAGE_KERNEL_BILINEAR, 
							   320, 
							   240, 
							   0, 
							   &resampled_image ) ) )
{
    printf( "Error! Unable to resample the source image." );
    return -1;
}

// TODO(you): The image is resampled! Go party with 'resampled_image'.

More Information

For more information about this library or the larger Imagine Framework, visit bertolami.com.