CS2210 U202115473 刘欣逸 #3
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save image ../images/CS_5x.jpg
save image ../images/CS_5x.jpg
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以时间顺序简述优化过程：
用std::thread创建多个线程对同一个数据对象res进行并行着色。
优化weightcoeff中的算术计算
将计算的系数存入数组，将WeightCoeff()调用次数减少到8次（在avx优化时被重写）
avx512优化CalcCoeff计算。
对于不同图片调整分块块数。
优化src为引用传递（传入指针）
优化后大致效果：
HUST.jpg:15~20ms
CS.JPEG:40~50ms
HUST.JPEG:110~140ms