tf.raw_ops.DecodeAndCropJpeg | TensorFlow v2.16.1 (original) (raw)
tf.raw_ops.DecodeAndCropJpeg
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Decode and Crop a JPEG-encoded image to a uint8 tensor.
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tf.compat.v1.raw_ops.DecodeAndCropJpeg
tf.raw_ops.DecodeAndCropJpeg(
contents,
crop_window,
channels=0,
ratio=1,
fancy_upscaling=True,
try_recover_truncated=False,
acceptable_fraction=1,
dct_method='',
name=None
)
The attr channels indicates the desired number of color channels for the decoded image.
Accepted values are:
- 0: Use the number of channels in the JPEG-encoded image.
- 1: output a grayscale image.
- 3: output an RGB image.
If needed, the JPEG-encoded image is transformed to match the requested number of color channels.
The attr ratio allows downscaling the image by an integer factor during decoding. Allowed values are: 1, 2, 4, and 8. This is much faster than downscaling the image later.
It is equivalent to a combination of decode and crop, but much faster by only decoding partial jpeg image.
| Args | |
|---|---|
| contents | A Tensor of type string. 0-D. The JPEG-encoded image. |
| crop_window | A Tensor of type int32. 1-D. The crop window: [crop_y, crop_x, crop_height, crop_width]. |
| channels | An optional int. Defaults to 0. Number of color channels for the decoded image. |
| ratio | An optional int. Defaults to 1. Downscaling ratio. |
| fancy_upscaling | An optional bool. Defaults to True. If true use a slower but nicer upscaling of the chroma planes (yuv420/422 only). |
| try_recover_truncated | An optional bool. Defaults to False. If true try to recover an image from truncated input. |
| acceptable_fraction | An optional float. Defaults to 1. The minimum required fraction of lines before a truncated input is accepted. |
| dct_method | An optional string. Defaults to "". string specifying a hint about the algorithm used for decompression. Defaults to "" which maps to a system-specific default. Currently valid values are ["INTEGER_FAST", "INTEGER_ACCURATE"]. The hint may be ignored (e.g., the internal jpeg library changes to a version that does not have that specific option.) |
| name | A name for the operation (optional). |
| Returns |
|---|
| A Tensor of type uint8. |