解决[DNNDK] invalid pixel value of input tensor:128

解决方式：
将image_data /= 255.改成mage_data /= 512.

'''image preprocessing'''
def pre_process(image, model_image_size):
image = image[...,::-1]
image_h, image_w, _ = image.shape
if model_image_size != (None, None):
assert model_image_size[0]%32 == 0, 'Multiples of 32 required'
assert model_image_size[1]%32 == 0, 'Multiples of 32 required'
boxed_image = letterbox_image(image, tuple(reversed(model_image_size)))
else:
new_image_size = (image_w - (image_w % 32), image_h - (image_h % 32))
boxed_image = letterbox_image(image, new_image_size)
image_data = np.array(boxed_image, dtype='float32')
image_data /= 255.///////////改这里////////////
image_data = np.expand_dims(image_data, 0)
return image_data

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