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基于光譜成像的豬肉新鮮度空間分布預(yù)測評價方法
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國家自然科學(xué)基金面上項目(32072498)和南京市科技發(fā)展計劃(農(nóng)業(yè)科技攻關(guān))項目(2015sa213015)


Evaluation of Spectral Imaging-based Spatial Predictions of Freshness Spatial Distribution over Pork
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    摘要:

    新鮮度指標(biāo)在像素位置缺乏微觀參考值,因此將基于均值光譜的化學(xué)計量學(xué)模型應(yīng)用到像素光譜時,,無法對指標(biāo)空間分布預(yù)測質(zhì)量進(jìn)行直接評價,。提出了基于準(zhǔn)度和精度的評價方法,以興趣區(qū)域內(nèi)各像素位置微觀預(yù)測值的統(tǒng)計均值相對于理化檢測值的決定系數(shù)和均方根誤差作為準(zhǔn)度評價指標(biāo),;根據(jù)新鮮度指標(biāo)的理論允許范圍,,以TVB-N微觀預(yù)測值小于零的像素點(diǎn)在興趣區(qū)域內(nèi)所占比值作為精度評價指標(biāo)?;谄钚《嘶貧w,,在可見-近紅外波段(550~970nm),分別對全波段,、利用連續(xù)投影算法精選的20個和6個特征波段建立新鮮度預(yù)測模型,;采用5種不同帶寬的光譜濾波,將濾波前后光譜所得指標(biāo)空間分布預(yù)測結(jié)果進(jìn)行比較,。研究表明:經(jīng)不同光譜預(yù)處理及化學(xué)計量學(xué)模型所得指標(biāo)空間分布預(yù)測結(jié)果存在顯著差異,。盡管光譜均值濾波后像素光譜質(zhì)量仍低于均值光譜,但指標(biāo)空間分布預(yù)測準(zhǔn)度恒等于預(yù)測模型本身,;指標(biāo)空間分布預(yù)測精度明顯受到像素光譜質(zhì)量及預(yù)測模型波段增益值的共同影響,,前者占主導(dǎo)作用(R=0.72)。因此,,本文的評價方法能夠?qū)诠庾V成像的化學(xué)計量學(xué)指標(biāo)空間分布預(yù)測質(zhì)量進(jìn)行評價,;利用線性化學(xué)計量學(xué)算法進(jìn)行指標(biāo)空間分布預(yù)測準(zhǔn)度不會下降;在實(shí)踐中,,可以通過提高像素光譜信噪比和限制模型波段增益提高預(yù)測的精度,。

    Abstract:

    Since the unavailability of local reference freshness values at individual pixels, a direct validation is impossible for the spatial distribution of pork freshness, i.e., the freshness maps visualized through applying the chemometric models that are trained on average spectra of regions of interest (ROI) to the spectra at individual pixels within the ROIs. Therefore, a dual-criteria evaluation of the freshness maps that were produced through different chemometric systems coupled with varied spectral filtering on both accuracy and precision was proposed. The former was quantified by the coefficient of determination of prediction (R2P) and the root mean square error of prediction between the chemical reference of ROIs and the average of the predictions at all individual pixels therein. The latter was quantified with the ratio of the pixels having negative TVB-N values to those of the ROI for a given subject, since the non-negativity according to the theoretical range of the freshness measurement. A bank of drastically different freshness maps of the same batch of pork were produced by using partial least squares regression (PLSR), over the visual/near infrared spectral range over 550~970nm, both before and after spectral filtering using ideal average smoothing filters with five different bandwidths of 6nm, 18nm,30nm, 42nm, and 54nm, respectively. The full range of consecutive wavebands, as well as 20 or 6 feature bands which were selected by successive projection algorithm (SPA), were used to form a collection of 18 combinations of bandwidth and the number of spectral bands to build chemometric models. Drastic difference resulted between the 18 approaches to visualization of freshness distribution. Analysis result showed, however, that all freshness maps were of good accuracy, equal to that of the chemometric models despite the lower quality of the spectra at individual pixels, even after spectral filtering, than those used in the training of models. And the precision of spatial predictions of freshness seemed to be co-determined by both spectra quality at individual pixels and the waveband-gains of chemometric models, and dominated by the former, R=0.72. It may be concluded that the spatial distributive predictions from imaging chemometrics can be objectively evaluated according to the statistics of the local predictions at pixels and the theoretic range of quality-indicating attributes;accuracy of quality-indicating maps, predicted on spectra at pixels, would not change from that of a linear chemometric system;better precision of spatial distribution prediction could be expected if spectral signal-to-noise ratio at pixels was improved and a chemometric model’s gains of wavebands were low.

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趙茂程,吳澤本,汪希偉,邢曉陽,陳加新,唐于維一.基于光譜成像的豬肉新鮮度空間分布預(yù)測評價方法[J].農(nóng)業(yè)機(jī)械學(xué)報,2022,53(3):412-422. ZHAO Maocheng, WU Zeben, WANG Xiwei, XING Xiaoyang, CHEN Jiaxin, TANG Yuweiyi. Evaluation of Spectral Imaging-based Spatial Predictions of Freshness Spatial Distribution over Pork[J]. Transactions of the Chinese Society for Agricultural Machinery,2022,53(3):412-422.

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  • 收稿日期:2021-02-04
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  • 在線發(fā)布日期: 2022-03-10
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