PyOpenCL图像处理:两张图片不带权重叠加

2018-02-27 11:37:13来源:oschina作者:IOTService人点击

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# -*- coding: utf-8 -*-
from __future__ import absolute_import, print_function
import numpy as np
import pyopencl as cl
import cv2
from PIL import Image
def RoundUp(groupSize, globalSize):
r = globalSize % groupSize;
if r == 0:
return globalSize
else:
return globalSize + groupSize - r
# 创建Context
# 如果有多个设备,则会提示选择
ctx = cl.create_some_context()
# 创建CommandQueue
queue = cl.CommandQueue(ctx)
mf = cl.mem_flags
# 通过字符串内容编译OpenCL的Program
prg = cl.Program(ctx, """
__kernel void image_add(__read_only image2d_t input,__read_only image2d_t input2,
__write_only image2d_t output){
//初始化采样器
const sampler_t sampler = CLK_FILTER_NEAREST |
CLK_NORMALIZED_COORDS_FALSE |
CLK_ADDRESS_CLAMP;
//获取图片大小
const int2 size = get_image_dim(input);
//设置当前像素
int2 coord = (int2)(get_global_id(0),get_global_id(1));
if(coord.x >= 0 && coord.x < size.x && coord.y >= 0 && coord.y < size.y){
float4 color = read_imagef(input,sampler,coord) + read_imagef(input2,sampler,coord);
color.w = 1.0f;
write_imagef(output,coord,color);
}
}
""").build()
# 打开图片文件
src1 = Image.open('temp/images/f1.png')
src2 = Image.open('temp/images/f2.png')
dist = Image.new('RGBA',(640,480),(255,255,255))
# OpenCL处理的图片文件格式RGBA,unit8
imageFormat = cl.ImageFormat(cl.channel_order.RGBA,cl.channel_type.UNSIGNED_INT8)
# 将图片从Host复制到Device
img1 = cl.Image(ctx, mf.READ_ONLY | mf.COPY_HOST_PTR,imageFormat,src1.size,None,src1.tobytes())
img2 = cl.Image(ctx, mf.READ_ONLY | mf.COPY_HOST_PTR,imageFormat,src2.size,None,src2.tobytes())
output = cl.Image(context=ctx,flags=mf.WRITE_ONLY,format=imageFormat,shape=src1.size)
# 根据图片大小定义WorkSize
localWorkSize = ( 8, 8 )
globalWorkSize = ( RoundUp(localWorkSize[0], src1.size[0]),
RoundUp(localWorkSize[1], src1.size[1]))
# 执行Kernel
prg.image_add(queue,globalWorkSize,localWorkSize,img1,img2,output)buffer = np.zeros(src1.size[0] * src1.size[1] * 4, np.uint8)
origin = ( 0, 0, 0 )
region = ( src1.size[0], src1.size[1], 1 )
# 将处理好的图片从设备复制到HOST
cl.enqueue_read_image(queue, output,
origin, region, buffer).wait()
# 保存图片
dist = Image.frombytes("RGBA",src1.size, buffer.tobytes())
dist.save('temp/images/cl-output.png')
dist.show()

程序运行结果:



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