torchvision/transforms/transforms.py
def get_params(img, scale, ratio):
        """Get parameters for ``crop`` for a random sized crop.

        Args:
            img (PIL Image): Image to be cropped.
            scale (tuple): range of size of the origin size cropped
            ratio (tuple): range of aspect ratio of the origin aspect ratio cropped

        Returns:
            tuple: params (i, j, h, w) to be passed to ``crop`` for a random
                sized crop.
        """
        area = img.size[0] * img.size[1]

        for attempt in range(10):
            target_area = random.uniform(*scale) * area
            log_ratio = (math.log(ratio[0]), math.log(ratio[1]))
            aspect_ratio = math.exp(random.uniform(*log_ratio))

            w = int(round(math.sqrt(target_area * aspect_ratio)))
            h = int(round(math.sqrt(target_area / aspect_ratio)))

            if w <= img.size[0] and h <= img.size[1]:
                i = random.randint(0, img.size[1] - h)
                j = random.randint(0, img.size[0] - w)
                return i, j, h, w

        # Fallback to central crop
        in_ratio = img.size[0] / img.size[1]
        if (in_ratio < min(ratio)):
            w = img.size[0]
            h = w / min(ratio)
        elif (in_ratio > max(ratio)):
            h = img.size[1]
            w = h * max(ratio)
        else:  # whole image
            w = img.size[0]
            h = img.size[1]
        i = (img.size[1] - h) // 2
        j = (img.size[0] - w) // 2
        return i, j, h, w
def get_params(img, scale, ratio):
        """Get parameters for ``crop`` for a random sized crop.

        Args:
            img (PIL Image): Image to be cropped.
            scale (tuple): range of size of the origin size cropped
            ratio (tuple): range of aspect ratio of the origin aspect ratio cropped

        Returns:
            tuple: params (i, j, h, w) to be passed to ``crop`` for a random
                sized crop.
        """
        area = img.size[0] * img.size[1]

        for attempt in range(10):
            target_area = random.uniform(*scale) * area
            log_ratio = (math.log(ratio[0]), math.log(ratio[1]))
            aspect_ratio = math.exp(random.uniform(*log_ratio))

            w = int(round(math.sqrt(target_area * aspect_ratio)))
            h = int(round(math.sqrt(target_area / aspect_ratio)))

            if w <= img.size[0] and h <= img.size[1]:
                i = random.randint(0, img.size[1] - h)
                j = random.randint(0, img.size[0] - w)
                return i, j, h, w

        # Fallback to central crop
        in_ratio = img.size[0] / img.size[1]
        if (in_ratio < min(ratio)):
            w = img.size[0]
            h = w / min(ratio)
        elif (in_ratio > max(ratio)):
            h = img.size[1]
            w = h * max(ratio)
        else:  # whole image
            w = img.size[0]
            h = img.size[1]
        i = (img.size[1] - h) // 2
        j = (img.size[0] - w) // 2
        return i, j, h, w
def get_params ( img , scale , ratio ) : area = img . size [ 0 ] * img . size [ 1 ] for attempt in range ( 10 ) : target_area = random . uniform ( * scale ) * area log_ratio = ( math . log ( ratio [ 0 ] ) , math . log ( ratio [ 1 ] ) ) aspect_ratio = math . exp ( random . uniform ( * log_ratio ) ) w = int ( round ( math . sqrt ( target_area * aspect_ratio ) ) ) h = int ( round ( math . sqrt ( target_area / aspect_ratio ) ) ) if w <= img . size [ 0 ] and h <= img . size [ 1 ] : i = random . randint ( 0 , img . size [ 1 ] - h ) j = random . randint ( 0 , img . size [ 0 ] - w ) return i , j , h , w # Fallback to central crop in_ratio = img . size [ 0 ] / img . size [ 1 ] if ( in_ratio < min ( ratio ) ) : w = img . size [ 0 ] h = w / min ( ratio ) elif ( in_ratio > max ( ratio ) ) : h = img . size [ 1 ] w = h * max ( ratio ) else : # whole image w = img . size [ 0 ] h = img . size [ 1 ] i = ( img . size [ 1 ] - h ) // 2 j = ( img . size [ 0 ] - w ) // 2 return i , j , h , w
Get parameters for ``crop`` for a random sized crop.

        Args:
            img (PIL Image): Image to be cropped.
            scale (tuple): range of size of the origin size cropped
            ratio (tuple): range of aspect ratio of the origin aspect ratio cropped

        Returns:
            tuple: params (i, j, h, w) to be passed to ``crop`` for a random
                sized crop.
Get parameters for crop for a random sized crop .