Introduction

xk-isp is an open source image signal processor (ISP) based on Xilinx development tools. Up to now, it supports to process 12-bit raw image data of any resolution. The entire pipeline includes 17 function modules shown in the following:

File Structure

openISP
├─fpga
│      host.cpp
│      top.cpp
│      top.h
│      xcl2.cpp
│      xcl2.h
│     
├─src
│    isp_top.h
│    file_define.h
│    "*module*".cpp
│    "*module*".h
│    ...
│   
├─tb
│     tb_"*module*".cpp
│    ...
│   
├─tcl
│      Makefile
│      "*module*".tcl
│      "*module*"_directives.tcl
│    ...
│   
├─tv
│     Makefile
│     hls_param.txt
│     input.raw
│     isp
│     readme_for_tv
├─  LICENSE
├─  setup_env.sh
└─  README.md

fpga contains code files for top level integration verification. src contains source code files which are the single module of the xk-isp project and head files(file_define.h) for single module test. tb contains code files for verificating the function consistency with Cmodel(tv/isp) in the module level. tcl contains the scripts for execuating the code files in the tb("module".tcl) and adding the pragma command for the code files in the src ("module"_directives.tcl). Makefile in the tcl is used for module level verification. tv contains the files for generating the test vectors. You can read the readme_for_tv for more details. setup_env.sh is used to designate the development tools. (Vitis HLS or Vivado)

Usage

Clone this repo:

git clone xxx.git

cd xk-isp

Environment setup

Modify setup_env.sh to add the installed vivado or vitis hls path under the current system. Then complete the environment setup.

source setup_env.sh

Test vector generate

Before starting the project, we need use xk-isp Cmodel ispto generate test vectors. These is an test image input.rawand default configuration hls_param.txt in tv.

cd tv

./isp -i input.raw -c hls_param.txt

If you want to use your own image, please modify makefile

./isp -i "your test image" -c "your configuration"

Note：the configuration is fixed in each module level verification. You should modify the verification code files( tb_"*module*".cpp in tb) to match the configuration of Cmodel. We will modify the verification code files to read configuration file in the future update.

module level verification

For module level verification, you can use the script Makefile in the tcl. Of course, you can modify the Makefileas needed

cd tcl

make

Top level integration verification

For top level integration verification, you can use the vitis GUI. The example is shown as follows: 1.Create a new project using the vitis. Import top.h and top.cpp under kernels and host.cpp, top.h, xcl2.cpp, xcl2.hpp under host platform(x86).

2.Set top file Under the kernel directory, double-click .prj to enter its configuration interface, click and set the “isp_top” function as the top level.

3.Set test images path and configuration parameters Enter the host.cpp

• image path Modify the "TOP_SRC1" and "TOP_DST1" to your image paths.
• image resolution "IMAGE_HEIGHT" and "IMAGE_WIDTH" determine the input image height and witdh. "upper_left_x", "upper_left_y" , "lower_right_x*" ,"lower_right_y" determine the pixel positions of the upper left and lower right corners of the cropped image. "CROP_HEIGHT" and "CROP_WIDTH" determine the output image height and width. They need to be matched with "upper_left_x", "upper_left_y" , "lower_right_x*" ,"lower_right_y"
• module configuration You can find them in the host.cpp

4.Compile and run Click the settings in the Assistant window to select the target we compile ("emulation-SW", "emulation-HW", "HW")

Click build in the Assistant window to compile. Click run to execute the project.