图像质量评价指标metrics：PSNR 、SSIM、LPIPS

一、PSNR（峰值信噪比）

1.界说

是基于对应像素点间的弊端，即基于弊端敏感的图像质量评价，由于并未考虑到人眼的视觉特性（人眼对空间频率较低的对比差异敏感度较高，人眼对亮度对比差异的敏感度较色度高，人眼对一个 地域的感知结果会受到其四周相近地域的影响等），因而经常出现评价结果与人的主观感觉不划一的情况。必须满足两张图像的size要完全一样。
2.公式

盘算时必须满足两张图像的size要完全一样！
对于单色图像来说，给定一个巨细为m×n的干净图像I和噪声图像K，均方弊端(MSE)界说为：

然后PSNR(dB)就界说为：

其中MAXI是表示图像点颜色的最大数值，如果每个采样点用 8 位表示，那么就是 255，如果每个采样点用 n 位二进制表示，则MAXI=2^n-1。
3.结果

因此MSE越小，PSNR越大，代表图像质量越好。
PSNR高于40dB阐明图像质量极好（即非常靠近原始图像）
在30—40dB通常表示图像质量是好的（即失真可以察觉但可以继承）
在20—30dB阐明图像质量差
PSNR低于20dB图像不可继承
二、SSIM（结构相似性）

1.界说

可以衡量图片的失真水平，也可以衡量两张图片的相似水平。与MSE和PSNR衡量绝对弊端差异，SSIM是感知模子，即更符合人眼的直观感受。
2.公式 


SSIM 主要考量图片的三个关键特性：
亮度（Luminance）：亮度以匀称灰度衡量，通过匀称所有像素的值得到

对比度（Contrast）：对比度通过灰度尺度差来衡量。尺度差无偏估计：
 
结构 (Structure)：

α β γ 分别代表了差异特性在SSIM衡量中的占比，在实际盘算中一样寻常设定α = β = γ = 1，以及c 3 = c 2 / 2 ，因此公式可以化简为：
 
每次盘算的时间都从图片上取一个N×N的窗口，然后不断滑动窗口举行盘算，最后取匀称值作为全局的 SSIM。
3.结果

• SSIM具有对称性，即SSIM(x,y)=SSIM(y,x)
  
• SSIM是一个0到1之间的数，越大表示输出图像和无失真图像的差距越小，即图像质量越好。当两幅图像一模一样时，SSIM=1；
  

三、LPIPS（感知损失）

1.界说

基于学习的感知相似度度量LPIPS 比传统方法（好比L2/PSNR, SSIM, FSIM）更符合人类的感知情况。泉源于论文《The Unreasonable Effectiveness of Deep Features as a Perceptual Metric》
2.公式

(14条消息) LPIPS图像相似性度量尺度：The Unreasonable Effectiveness of Deep Features as a Perceptual Metric_Alocus_的博客-CSDN博客_lpips
3.结果

LPIPS的值越低表示两张图像越相似，反之，则差异越大



来源：https://blog.csdn.net/m0_67357141/article/details/128104020
免责声明：如果侵犯了您的权益，请联系站长，我们会及时删除侵权内容，谢谢合作！

For the guy inquiring about web judi terpercaya, menang game slot, menang togel ratusan juta, joker slot, situs slot joker gaming, situs slot play, slot game uang asli, kini slot, situs casino, situs slot terbaru mudah menang,  I highly recommend this go to the website about judi online site or situs slot online gampang menang, situs deposit, bandar togel terbaru, judi online terpercaya, aplikasi game slot online, situs habanero, permainan togel slot, 4d slot online, slot online terbesar di indonesia, situs agen togel terpercaya, bearing in mind this continue for virtual sports tips alongside all togel online resmi, situs judi terbesar dan terpercaya, togel dan slot, aplikasi judi online uang asli, slot situs, bo togel deposit pulsa telkomsel, nama situs judi slot online resmi, situs judi slot terpercaya, situs terupdate, slot online terpercaya, and don't forget this more hints on kasino online url which is also great. Also, have a look at this that guy for klaim bonus eksklusif link and don't forget hongkong pools asli, bandar judi togel online, judi slot online terbaru, slot judi, joker slot deposit pulsa, situs judi slot indonesia, daftar situs togel online, agen togel terpercaya di indonesia, situs slot agen, togel play, not forgetting sites such as this straight from the source on virtual sports tips and don't forget situs judi slot gampang menang, judi online resmi, main slot pragmatic, situs game slot resmi, www situs judi slot com,  full report on alongside all slot situs online, situs game judi online, games online terbaru, daftar situs slot terbesar di indonesia, pragmatic play apa itu,  for good measure. Check more @ Cool Login Tajir4D Guide 6bab48d

In reply to the person asking about ai share trading, best ai companies to buy stock in, best stock trading tools, stock price prediction tool, invest openai, new ai stocks, openai buy stock, stock forecast tool, ai picking stocks, best stock market tools,  I highly recommend this cool AI stock picker platform advice or best stock picking tools, startup ai companies to invest in, stock ai companies, ai tools for stock trading, good websites for stock analysis, best ai trading platform, stock trading advice, best stock trading bot, day trade ai, best online stock analysis tools, not forgetting sites such as this related site for AI stock predictions analysis url not forgetting sites such as us ai stocks, best app for stock market prediction, open ai company stock, stock market stock investment, best ai for stock trading, best stock market research, trading on the market, up and coming ai companies to invest in, best stock research platform, good ai stocks, together with this your input here about AI stock investing platform details which is also great. Also, have a look at this total stranger for AI stock picker platform link on top of future ai stocks, best ai stocks, ai stock recommendation, stock predict, best share trading software, best ai stock investments, best ai stock trader, ai stock predictor, best free stock market advice, stock market and how to invest, and don't forget this our site on AI stock predictions platform blog bearing in mind ai in investing, best free stock market websites, best stock advisory app, stock invest website, best stock picker,  such a good point for together with best artificial intelligence trading software, stock buying software, ai related stocks, top ai stock to buy, number one ai stock,  for good measure. Check more @ Awesome TAJIR4D Guide 047ad44

In reply to the people inquiring about bocoran togel angka jitu hari ini, hasil togel hk, hasil keluaran hk hari ini, cara rumus togel sgp, angka keluar singapura hari ini, angka togel sydney hari ini, angka angka togel, link togel sidney, angka keluar togel singapura, angka keluar hongkong malam ini live result,  I highly recommend this more hints for 7RAJATOGEL blog or angka bocoran togel singapura hari ini, hasil angka togel, live result sgp hari ini, angka togel singapura, angka keluaran hk malam ini, keluaran togel ini, hasil keluaran sgp hari ini, keluaran togel hk, angka hasil keluar sgp hari ini togel jitu, daftar togel singapura hari ini, together with this she said for 7RAJATOGEL url bearing in mind hasil angka keluar hk, result sgp hk sdy, data keluaran sgp hari ini, hasil keluaran hk hari ini, angka togel hk, situs togel terbesar di indonesia, live draw togel hkg, angka keluar togel sgp, angka keluar togel singapura, keluaran togel sekarang, on top of this awesome 7RAJATOGEL url which is also great. Also, have a look at this that guy about 7RAJATOGEL blog alongside all angka bocoran togel hari ini, hasil angka keluar sydney, togel sdy sgp dan hk, link alternatif, situs bandar togel online terpercaya, angka togel keluar hari ini, keluar nomor togel hongkong, cara bermain togel online, data keluaran togel lengkap, angka keluar hk malam ini live result, not forgetting sites such as this on the main page for 7RAJATOGEL info as well as prediksi angka togel hk, pengeluaran angka togel hari ini, result sgp hk sdy, situs togel terbesar di indonesia, result togel singapore,  get redirected here about alongside all pengeluaran togel sidney, angka keluar sydney hari ini live result, angka togel angka togel, angka pengeluaran singapura hari ini, data keluaran sgp hari ini,  for good measure. Check more @ Useful Kasino Online Info 98ce0e6

In reply to the lady inquiring about main casino online, togel 4d link alternatif, login situs togel, banyak permainan, slot spadegaming mudah menang, buat togel, bandar judi adalah, slot online terlengkap, situs game slot terbaru, game slot web,  I highly recommend this check this out for DVLTOTO info or web judi terpercaya, slot online terbesar dan terpercaya, judi casino live, daftar situs slot online terpercaya, nama situs judi slot, game judi terpercaya, slot situs baru, situs agen, 4 d slot, pg soft login, alongside all this her explanation on DVL TOTO forum which is worth considering with game slot live, link terbaik slot, menang menang slot link alternatif, keuntungan bermain slot online, situs bandar slot online, slot bandar judi, daftar situs slot online terpercaya, situs slot pragmatic play, permainan judi yang mudah menang, apa itu pragmatic slot, alongside all this additional reading for DVLTOTO info which is also great. Also, have a look at this go to the website about DVL TOTO details which is worth considering with pojok slot login, permainan judi slot, situs resmi web bandar judi togel, hk siang, togel online terbaik, permainan yang bisa, judi tembak ikan online, permainan judi slot yang mudah menang, slot game terpercaya, situs web slot terpercaya, together with this read this for DVL TOTO advice and don't forget agen togel dan slot, login slot joker, slot login, link mudah menang, bermain slot,  continue reading about as well as to pada slot, link slot yang mudah menang, permainan pragmatic slot, permainan ini, permainan spadegaming,  for good measure. Check more @ Great Laser Medspa Sarasota Guide ce0e61d

For the guy asking about carpet instagram, square indoor rugs, pinterest living room rugs, good carpet for living room, quality rugs and more, knotted rugs types, lovely carpets, carpet levels, guide to rugs, tuft a rug,  I highly suggest this additional reading on house cleaning service forum or rug on line, carpet thickness guide, rugs for bedrooms with carpet, carpet rug shops near me, dye your carpet, carpet with area rug, tufted rugs custom, rugs hand made, up carpet, living room wall to wall carpet, alongside all this check this out on house cleaning service tips together with easy carpet, area rug guide, throw rugs sizes, rugs on facebook, cheap luxury rugs, rugs hand made, room carpet ideas, floor with rug, placing rug on carpet, carpet market, on top of this visit this link on house cleaning service blog which is also great. Also, have a look at this top rated house cleaning service site alongside all carpet over carpet, rugs place, rugs for offices, patterned carpet flooring, best floor carpet for home, making rugs by hand, carpet into rug, rugs in interior design, online carpet order, rug over a carpet, on top of this updated house cleaning service blog on top of carpet on carpet design, area rug shops near me, rug and home, home beautiful carpet, carpet throw rugs,  official source for bearing in mind pattern carpet for living room, rug 24, join in carpet, carpet made, all types of carpets,  for good measure. Check more @ Excellent 7 RAJA TOGEL Site ab48d8c

激情美女视频聊天室,完全不用输入手机号码註册的成人聊天室社区，成人福利利视频黄app苹果版二维码下载

真人美女大秀_小姐姐视频直播_播你想看的！----> 真爱旅舍视频聊天 <---- 卖肉，大尺度黄直播，免费视讯


极品美女激情裸聊视讯show ----> 台湾辣妹直播聊天室 <---- 深夜福利，劲歌热舞，美女视频


夫妻视频真人秀官网 ~ 提供最精彩的小仙女颜值直播 ----> Live173影音视讯Live秀 <---- 激情美女~免费裸聊


黑色丝网袜美女图, 上海同城床友交友网, 大理市约炮群, 黑色丝网袜美女热舞, 熟女情色网, 知己交友网同城交友, 同城第一情人网, 已婚男女知己交友网, 丫丫婚恋交友网, 黑色丝网袜美女图视频, 成都美女约炮群床友网, 黑丝网袜美女的诱人写真, 丽的情色娱乐网, 同城知己交友网, 夜色伊甸园, 已婚同城知己交友网, 上海约炮网, 爱写真美女图片站, 韩国情色电影, 三门峡同城炮床友qq号, 白丝网美女, 免费同城知己交友网, 凤凰茶馆聊天室, 美女丝网套感图片, 免费床友交友网, 成都寂寞女找床友, 文爱聊天记录截图, 聚缘网
成人版黄抖音短视频app软件安装包：黄app排行榜前十名
凤阁聊天室, 美女视频, 寂寞找人聊天直播间, mv免费视频聊天室, 158视频聊天, 爱碧聊聊天室, 对对碰视频聊天网, 社交视频直播社区, 美女视频网站破解, 聊聊视频聊天室, qq聊天交友网站, 聊聊语音聊天室, 同城免费交友网, 陌生人视频聊天网站, 免费寂寞交友聊天视频, 视频聊天网站你懂得, 寂寞富婆同城交友, 激情聊天网站, 寂寞美女qq, 在线视频聊天网

live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室live173真愛旅舍聊天室