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Acta Agronomica Sinica ›› 2024, Vol. 50 ›› Issue (12): 3083-3095.doi: 10.3724/SP.J.1006.2024.42016

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Growth visualized prediction method of multi-variety rice based on improved Pix2Pix-HD network

DUAN Ling-Feng1(), WANG Xin-Yi1, WANG Zhi-Hao1, GENG Ze-Dong2, LU Yun-Rui2, YANG Wan-Neng1,2,*()   

  1. 1College of Engineering, Huazhong Agricultural University, Wuhan 430070, Hubei, China
    2National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, Hubei, China
  • Received:2024-03-10 Accepted:2024-08-15 Online:2024-12-12 Published:2024-09-02
  • Contact: *E-mail: ywn@mail.hzau.edu.cn
  • Supported by:
    National Natural Science Foundation of China(32170411);Hubei Hongshan Laboratory Open Project(2021hskf005)

Abstract:

With the advancement of information technology and agricultural digitization, the visualized prediction of digital plant growth holds significant development potential. As an important food crop, achieving visualized growth prediction for rice is of great significance for analyzing its growth and development. However, due to the large size and complex morphology of rice, attaining high-precision and high-resolution visualized growth prediction has been challenging. This study proposes a growth prediction method for rice based on an improved Pix2Pix-HD network, achieving high-precision visualized growth prediction from the heading stage to the filling stage of rice. Comparative experiments were designed to verify the effectiveness of the model improvement scheme. The results showed that the FID, PSNR, and SSIM values between the predicted and real filling stage rice images in the test set were 24.75, 13.58, and 0.78, respectively. The average correlation coefficient between the predicted and actual phenotypes was 0.762, demonstrating good accuracy at different scales. The proposed data-driven rice growth prediction method can achieve high-resolution and high visual realism in rice growth visualization predictions, providing new solutions for rice growth forecasting.

Key words: rice, growth visualized prediction, generative adversarial network, Pix2Pix-HD, digital plants

Fig. 1

Overall technical process RGVP: proposed rice growth visualized predicter; Pix2Pix-HD: a generative adversarial network for image conversion based on deep learning."

Fig. 2

Network structure of Pix2Pix-HD G1: global generator; G2a: the first part of the local enhancer; G2b: the second part of the local enhancer; D1: 1024×1024 resolution scale discriminator; D2: 512×512 resolution scale discriminator; D3: 256×256 resolution scale discriminator."

Fig. 3

Improved network structure of global generator and discriminator in Pix2Pix-HD G1: global generator; D1: 1024×1024 resolution scale discriminator; RefP: reflection padding layer; Conv: convolution layer; BN: batch normalization layer; ReLU, LeakyReLU, Tanh, Sigmoid: different activation functions; ConvT: transpose convolution layer; Dropout: a regularization method."

Fig. 4

Examples of prediction results A1, A2, and A3: heading stage rice image; B1, B2, and B3: predicted filling stage rice image; C1, C2, and C3: ground truth filling stage rice image."

Table 1

Correlation coefficient between predicted phenotypes and real image phenotypes in phenotypic traits"

评价指标
Evaluation indicators
形态特征相关系数
Correlation coefficient of
morphological traits
纹理特征相关系数
Correlation coefficient of texture traits
MCCM MCCT MCCA
TPA GPA YPA FD H W 直方图特征
Histogram
灰度梯度共生矩阵特征
Gray-level co-occurrence matrix
M SE S MU3 U E C GM GDM GMSE GDMSE
CC 0.77 0.69 0.82 0.78 0.58 0.53 0.84 0.86 0.85 0.86 0.77 0.79 0.79 0.62 0.80 0.80 0.81 0.70 0.80 0.76
CCS 0.15 0.21 -0.05 0.17 0.01 0.27 0.06 0.03 0.06 -0.02 0.16 0.16 -0.08 -0.08 -0.05 -0.01 -0.02 0.13 0.02 0.06

Table 2

Comparison between predicted images and real images at different scales"

分辨率
Resolution
视觉相似性Visualized similarity 表型准确性Phenotypic accuracy
Fréchet距离FID 峰值信噪比PSNR 结构相似度SSIM MCCM MCCT MCCA
1024×1024 24.75 13.58 0.78 0.70 0.80 0.76
512×512 21.51 14.47 0.73 0.69 0.78 0.75
256×256 40.69 15.77 0.68 0.67 0.70 0.69

Table 3

Comparison of model performance with different improvements"

模型 Model 模型改进设计方案
Model improvement
视觉相似性
Visualized similarity
表型准确性
Phenotypic accuracy
训练阶段
随机失活
Training dropout
测试阶段
随机失活
Testing dropout
假标签损失
Fake label loss
空间注意力
机制
Spatial attention
通道注意力
机制
Channel
attention
Fréchet距离
FID
峰值信噪比 PSNR 结构相似度 SSIM MCCM MCCT MCCA
模型1
Model 1
× × × 30.44 13.27 0.77 0.64 0.72 0.69
模型2
Model 2
× × × × × 26.10 13.76 0.78 0.62 0.74 0.70
模型3
Model 3
× × × × 37.60 13.46 0.78 0.66 0.78 0.74
模型4
Model 4
× × × 29.65 13.58 0.78 0.65 0.78 0.74
模型5
Model 5
× × 24.75 13.58 0.78 0.70 0.80 0.76
模型6
Model 6
× 32.80 13.72 0.78 0.68 0.81 0.76

Fig. 5

Comparison of prediction results between Pix2Pix model and RGVP model A1, A2, and A3: heading stage rice image; B1, B2, and B3: Pix2Pix predicted filling stage rice image; C1, C2, and C3: RGVP predicted filling stage rice image; D1, D2, and D3: ground truth filling stage rice image; Pix2Pix: a generative adversarial network for image conversion based on deep learning; RGVP: proposed rice growth visualized predicter."

Table 4

Comparison between Pix2Pix model and RGVP model at two scales"

模型及处理
Model and process
分辨率
Resolution
视觉相似性Visualized similarity 表型准确性Phenotypic accuracy
Fréchet距离
FID
峰值信噪比
PSNR
结构相似度
SSIM
MCCM MCCT MCCA
Pix2Pix模型
Pix2Pix model
256×256 45.60 14.53 0.65 0.50 0.63 0.58
RGVP + 1/4下采样
RGVP + 1/4 Down-sampling
256×256 40.69 15.77 0.68 0.67 0.70 0.69
Pix2Pix + 4倍超分辨
Pix2Pix + 4× super-resolution
1024×1024 68.91 13.31 0.76 0.49 0.64 0.59
RGVP模型
RGVP model
1024×1024 24.75 13.58 0.78 0.70 0.80 0.76
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