Merge pull request #948 from tink2123/fix_max_wh

fix max_wh_ratio for predict

tools/infer/predict_rec.py

@@ -63,8 +63,9 @@ class TextRecognizer(object):
     def resize_norm_img(self, img, max_wh_ratio):
         imgC, imgH, imgW = self.rec_image_shape
         assert imgC == img.shape[2]
+        wh_ratio = max(max_wh_ratio, imgW * 1.0 / imgH)
         if self.character_type == "ch":
-            imgW = int((32 * max_wh_ratio))
+            imgW = int((32 * wh_ratio))
         h, w = img.shape[:2]
         ratio = w / float(h)
         if math.ceil(imgH * ratio) > imgW: