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README.md

Image Resize Example using nvJPEG

Description

This code demonstrates Image resize utility using NPP resize and nvJPEG library.

Key Concepts

Image Resize, Image Encoding and Decoding from NVJPEG Library

Supported SM Architectures

SM 3.0 SM 3.5 SM 3.7 SM 5.0 SM 5.2 SM 6.0 SM 6.1 SM 7.0 SM 7.2 SM 7.5

Supported OSes

Linux Windows

Supported CPU Architecture

x86_64

CUDA APIs involved

NPP NVJPEG

Architecture

  • JPEG decoding is handled by nvJPEG.
  • Image resizing is handled by NPP (algorithm: Lanczos)
  • JPEG encoding is handled by nvJPEG.

Building (make)

Prerequisites

Build command on Linux

$ mkdir build
$ cd build
$ cmake ..
$ make

Build command on Windows

$ mkdir build
$ cd build
$ cmake -DCMAKE_GENERATOR_PLATFORM=x64 ..
$ Open imageResize.sln project in Visual Studio 15 2017 and build

Usage

./imageResize -h

Usage: ./imageResize -i images-dir  [-o output-dir][-q jpeg-quality][-rw resize-width ] [-rh resize-height]
Parameters: 
	images-dir	:	Path to single image or directory of images
	output-dir	:	Write resized images to this directory [default resize_output]
	JPEG Quality	:	Use image quality [default 85]
	Resize Width	:	Resize width [default original_img_width/2]
	Resize Height	:	Resize height [default original_img_height/2]

Example:

-i input_images - JPEG input images
-o resize_images - resize output images
-q 85 - setting encoder quality 85
-rw 512 - resize width set to 512
-rh 512 - resize height set to 512

$  ./imageResize -i ../input_images/ -o resize_images -q 85 -rw 512 -rh 512

Sample example output on GV100, Ubuntu 18.04, CUDA 10.1

$  ./imageResize -i ../input_images/

Processing file: ../input_images/cat_baseline.jpg
Resize-width: 32 Resize-height: 32
Writing JPEG file: resize_output/cat_baseline.jpg
Processing file: ../input_images/img8.jpg
Resize-width: 240 Resize-height: 320
Writing JPEG file: resize_output/img8.jpg
Processing file: ../input_images/img5.jpg
Resize-width: 320 Resize-height: 240
Writing JPEG file: resize_output/img5.jpg
Processing file: ../input_images/img7.jpg
Resize-width: 240 Resize-height: 320
Writing JPEG file: resize_output/img7.jpg
Processing file: ../input_images/img2.jpg
Resize-width: 240 Resize-height: 320
Writing JPEG file: resize_output/img2.jpg
Processing file: ../input_images/img4.jpg
Resize-width: 320 Resize-height: 213
Writing JPEG file: resize_output/img4.jpg
Processing file: ../input_images/cat.jpg
Resize-width: 32 Resize-height: 32
Writing JPEG file: resize_output/cat.jpg
Processing file: ../input_images/cat_grayscale.jpg
Resize-width: 32 Resize-height: 32
Writing JPEG file: resize_output/cat_grayscale.jpg
Processing file: ../input_images/img1.jpg
Resize-width: 240 Resize-height: 320
Writing JPEG file: resize_output/img1.jpg
Processing file: ../input_images/img3.jpg
Resize-width: 320 Resize-height: 213
Writing JPEG file: resize_output/img3.jpg
Processing file: ../input_images/img9.jpg
Resize-width: 320 Resize-height: 240
Writing JPEG file: resize_output/img9.jpg
Processing file: ../input_images/img6.jpg
Resize-width: 320 Resize-height: 240
Writing JPEG file: resize_output/img6.jpg
------------------------------------------------------------- 
Total images resized: 12
Total time spent on resizing: 35.9706 (ms)
Avg time/image: 2.99755 (ms)
-------------------------------------------------------------