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scripts/libraries: Add support for yolov8 post-processing.
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@ -206,3 +206,57 @@ class yolo_v5_postprocess:
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nms.add_bounding_box(xmin[i], ymin[i], xmax[i], ymax[i],
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bb_scores[i], bb_classes[i])
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return nms.get_bounding_boxes(threshold=self.nms_threshold, sigma=self.nms_sigma)
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class yolo_v8_postprocess:
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_YOLO_V8_CX = const(0)
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_YOLO_V8_CY = const(1)
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_YOLO_V8_CW = const(2)
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_YOLO_V8_CH = const(3)
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_YOLO_V8_CLASSES = const(4)
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def __init__(self, threshold=0.6, nms_threshold=0.1, nms_sigma=0.1):
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self.threshold = threshold
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self.nms_threshold = nms_threshold
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self.nms_sigma = nms_sigma
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def __call__(self, model, inputs, outputs):
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oh, ow, oc = model.output_shape[0]
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class_count = ow - _YOLO_V8_CLASSES
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# Reshape the output to a 2D array
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column_outputs = outputs[0].reshape((oh * (_YOLO_V8_CLASSES + class_count), oc))
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# Threshold all the scores
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score_indices = np.max(column_outputs[_YOLO_V8_CLASSES:, :], axis=0)
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score_indices = np.nonzero(score_indices > self.threshold)[0]
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if not len(score_indices):
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return _NO_DETECTION
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# Get the bounding boxes that have a valid score
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bb = np.take(column_outputs, score_indices, axis=1)
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# Get the score information
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bb_scores = np.max(bb[_YOLO_V8_CLASSES:, :], axis=0)
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# Get the class information
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bb_classes = np.argmax(bb[_YOLO_V8_CLASSES:, :], axis=0)
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# Compute the bounding box information
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x_center = bb[_YOLO_V8_CX, :]
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y_center = bb[_YOLO_V8_CY, :]
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w_rel = bb[_YOLO_V8_CW, :] * 0.5
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h_rel = bb[_YOLO_V8_CH, :] * 0.5
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# Scale the bounding boxes to have enough integer precision for NMS
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ib, ih, iw, ic = model.input_shape[0]
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xmin = (x_center - w_rel) * iw
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ymin = (y_center - h_rel) * ih
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xmax = (x_center + w_rel) * iw
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ymax = (y_center + h_rel) * ih
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nms = NMS(iw, ih, inputs[0].roi)
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for i in range(bb.shape[1]):
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nms.add_bounding_box(xmin[i], ymin[i], xmax[i], ymax[i],
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bb_scores[i], bb_classes[i])
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return nms.get_bounding_boxes(threshold=self.nms_threshold, sigma=self.nms_sigma)
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