fix infer shape

tools/infer/predict_rec.py

@@ -89,6 +89,7 @@ class TextRecognizer(object):
         imgC, imgH, imgW = self.rec_image_shape
         assert imgC == img.shape[2]
         if self.character_type == "ch":
+            max_wh_ratio = max(max_wh_ratio, imgW / imgH)
             imgW = int((32 * max_wh_ratio))
         h, w = img.shape[:2]
         ratio = w / float(h)