BrightnessContrast

cvcuda.brightness_contrast(src: nvcv.Tensor, brightness: nvcv.Tensor, contrast: nvcv.Tensor, brightness_shift: nvcv.Tensor, contrast_center: nvcv.Tensor, stream: Optional[nvcv.cuda.Stream] = None) → nvcv.Tensor

Adjusts the brightness and contrast of the images according to the formula: out = brightness_shift + brightness * (contrast_center + contrast * (in - contrast_center)).

See also

Refer to the CV-CUDA C API reference for the BrightnessContrast operator for more details and usage examples.

Parameters

  • src (nvcv.Tensor) – Input tensor.

  • brightness (nvcv.Tensor, optional) – Optional tensor describing brightness multiplier. If specified, it must contain only 1 element. If not specified, the neutral 1. is used.

  • contrast (nvcv.Tensor, optional) – Optional tensor describing contrast multiplier. If specified, it must contain only 1 element. If not specified, the neutral 1. is used.

  • brightness_shift (nvcv.Tensor, optional) – Optional tensor describing brightness shift. If specified, it must contain only 1 element. If not specified, the neutral 0. is used.

  • contrast_center (nvcv.Tensor, optional) – Optional tensor describing contrast center. If specified, it must contain only 1 element. If not specified, the middle of the assumed input type range is used. For floats it is 0.5, for unsigned integer types it is 2 * (number_of_bits - 1), for signed integer types it is 2 * (number_of_bits - 2).

  • stream (nvcv.cuda.Stream, optional) – CUDA Stream on which to perform the operation.

Returns

The output tensor.

Return type

nvcv.Tensor

cvcuda.brightness_contrast(src: nvcv.ImageBatchVarShape, brightness: nvcv.Tensor, contrast: nvcv.Tensor, brightness_shift: nvcv.Tensor, contrast_center: nvcv.Tensor, stream: Optional[nvcv.cuda.Stream] = None) -> nvcv.ImageBatchVarShape

Adjusts the brightness and contrast of the images according to the formula: out = brightness_shift + brightness * (contrast_center + contrast * (in - contrast_center)).

The brightness/brightness_shift/contrast/contrast_center tensors’ length must match the number of samples in the batch.

See also

Refer to the CV-CUDA C API reference for the BrightnessContrast operator for more details and usage examples.

Parameters

  • src (nvcv.ImageBatchVarShape) – Input tensor.

  • brightness (nvcv.Tensor, optional) – Optional tensor describing brightness multiplier. If specified, it must contain 1 or N elements where N is the number of input images. If it contains a single element, the same value is used for all input images. If not specified, the neutral 1. is used.

  • contrast (nvcv.Tensor, optional) – Optional tensor describing contrast multiplier. If specified, it must contain either 1 or N elements where N is the number of input images. If it contains a single element, the same value is used for all input images. If not specified, the neutral 1. is used.

  • brightness_shift (nvcv.Tensor, optional) – Optional tensor describing brightness shift. If specified, it must contain either 1 or N elements where N is the number of input images. If it contains a single element, the same value is used for all input images. If not specified, the neutral 0. is used.

  • contrast_center (nvcv.Tensor, optional) – Optional tensor describing contrast center. If specified, it must contain either 1 or N elements where N is the number of input images. If it contains a single element, the same value is used for all input images. If not specified, the middle of the assumed input type range is used. For floats it is 0.5, for unsigned integer types it is 2 * (number_of_bits - 1), for signed integer types it is 2 * (number_of_bits - 2).

  • stream (nvcv.cuda.Stream, optional) – CUDA Stream on which to perform the operation.

Returns

The output image batch.

Return type

nvcv.ImageBatchVarShape

cvcuda.brightness_contrast_into(dst: nvcv.Tensor, src: nvcv.Tensor, brightness: nvcv.Tensor, contrast: nvcv.Tensor, brightness_shift: nvcv.Tensor, contrast_center: nvcv.Tensor, stream: Optional[nvcv.cuda.Stream] = None)

Adjusts the brightness and contrast of the images according to the formula: out = brightness_shift + brightness * (contrast_center + contrast * (in - contrast_center)).

See also

Refer to the CV-CUDA C API reference for the BrightnessContrast operator for more details and usage examples.

Parameters

  • src (nvcv.Tensor) – Input tensor.

  • dst (nvcv.Tensor) – Output tensor containing the result of the operation.

  • brightness (nvcv.Tensor, optional) – Optional tensor describing brightness multiplier. If specified, it must contain only 1 element. If not specified, the neutral 1. is used.

  • contrast (nvcv.Tensor, optional) – Optional tensor describing contrast multiplier. If specified, it must contain only 1 element. If not specified, the neutral 1. is used.

  • brightness_shift (nvcv.Tensor, optional) – Optional tensor describing brightness shift. If specified, it must contain only 1 element. If not specified, the neutral 0. is used.

  • contrast_center (nvcv.Tensor, optional) – Optional tensor describing contrast center. If specified, it must contain only 1 element. If not specified, the middle of the assumed input type range is used. For floats it is 0.5, for unsigned integer types it is 2 * (number_of_bits - 1), for signed integer types it is 2 * (number_of_bits - 2).

  • stream (nvcv.cuda.Stream, optional) – CUDA Stream on which to perform the operation.

Returns

None

cvcuda.brightness_contrast_into(dst: nvcv.ImageBatchVarShape, src: nvcv.ImageBatchVarShape, brightness: nvcv.Tensor, contrast: nvcv.Tensor, brightness_shift: nvcv.Tensor, contrast_center: nvcv.Tensor, stream: Optional[nvcv.cuda.Stream] = None)

Adjusts the brightness and contrast of the images according to the formula: out = brightness_shift + brightness * (contrast_center + contrast * (in - contrast_center)).

The brightness/brightness_shift/contrast/contrast_center tensors’ length must match the number of samples in the batch.

See also

Refer to the CV-CUDA C API reference for the BrightnessContrast operator for more details and usage examples.

Parameters

  • src (nvcv.ImageBatchVarShape) – Input image batch containing one or more images.

  • dst (nvcv.ImageBatchVarShape) – Output image batch containing the result of the operation.

  • brightness (nvcv.ImageBatchVarShape, optional) – Optional tensor describing brightness multiplier. If specified, it must contain 1 or N elements where N is the number of input images. If it contains a single element, the same value is used for all input images. If not specified, the neutral 1. is used.

  • contrast (nvcv.Tensor, optional) – Optional tensor describing contrast multiplier. If specified, it must contain either 1 or N elements where N is the number of input images. If it contains a single element, the same value is used for all input images. If not specified, the neutral 1. is used.

  • brightness_shift (nvcv.Tensor, optional) – Optional tensor describing brightness shift. If specified, it must contain either 1 or N elements where N is the number of input images. If it contains a single element, the same value is used for all input images. If not specified, the neutral 0. is used.

  • contrast_center (nvcv.Tensor, optional) – Optional tensor describing contrast center. If specified, it must contain either 1 or N elements where N is the number of input images. If it contains a single element, the same value is used for all input images. If not specified, the middle of the assumed input type range is used. For floats it is 0.5, for unsigned integer types it is 2 * (number_of_bits - 1), for signed integer types it is 2 * (number_of_bits - 2).

  • stream (nvcv.cuda.Stream, optional) – CUDA Stream on which to perform the operation.

Returns

None