[Fix]: Fix float image show error

[hhaAndroid]

resolve: #4727

[codecov]

Codecov Report

Merging #4732 (233ee82) into master (af95704) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4732      +/-   ##
==========================================
- Coverage   64.07%   64.00%   -0.08%     
==========================================
  Files         252      252              
  Lines       19684    19684              
  Branches     3339     3339              
==========================================
- Hits        12612    12598      -14     
- Misses       6397     6409      +12     
- Partials      675      677       +2     

Flag	Coverage Δ
unittests	63.96% <100.00%> (-0.08%)	⬇️

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Impacted Files	Coverage Δ
mmdet/core/visualization/image.py	79.61% <100.00%> (ø)
mmdet/models/roi_heads/mask_scoring_roi_head.py	55.35% <0.00%> (-32.15%)	⬇️
mmdet/models/roi_heads/mask_heads/maskiou_head.py	94.62% <0.00%> (-5.38%)	⬇️
mmdet/models/dense_heads/corner_head.py	75.60% <0.00%> (+1.87%)	⬆️
mmdet/models/detectors/cornernet.py	100.00% <0.00%> (+5.12%)	⬆️

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