Evaluation of Coarseness of Marbling in the Beef Ribeye by Computer Image Analysis

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  • 画像解析による牛胸最長筋内脂肪交雑粒子のあらさに関する評価法の検討
  • ガゾウ カイセキ ニ ヨル ギュウ キョウ サイチョウ キン ナイ シボウ コウザツ リュウシ ノ ア ラ サ ニ カンスル ヒョウカホウ ノ ケントウ

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Abstract

The method of evaluating the coarseness of the marbling particle was examined by computer image analysis, and “Coarseness Index” was newly proposed. The effects of breed and sex on the “Coarseness index” were investigated. Digital color images of M. longissimus dorsi of 11 Japanese Black steers assigned as BMS No. 5 by grader were converted into binary image. First, the binary images were thinning by 5, 10 and 20 rounds maintaining the connection of pixels. Second, the hairline (width of line being 1 pixel) of thinned image was removed. Finally, the number of pixels after thinning and removing hairline was counted. Correlation coefficient between scores assigned by five skilled graders for the coarseness of marbling particle and “Coarseness index (Cl2-5)” by computer image analysis was extremely high (r=0.96). Thus, Cl2-5 was calculated dividing the number of pixels after 5 rounds thinning and removing hairline by the number of pixel of marbling immediately after the binarization. The existence of “occluded marbling” was confirmed for the images with high Cl2-5 among the images of 1,821 Japanese Black (1,240 steers and 581 heifers) and 438 crossbred (Japanese Black ?? × Holstein ??, 277 steers and 161 heifers). The coarsenesses of marbling particles of crossbred and heifers were higher than those of Japanese Black and steers, respectively (P<0.01).

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