ocr edge_tpu ?

[zoldaten]

could you help with outdated ocr_text_detection on coral:
https://github.com/zoldaten/PINTO_model_zoo/blob/main/051_East_Text_Detection/text_detection_video_tpu.py

i tried to adopt it but sank:

from imutils.video import VideoStream
from imutils.video import FPS
import numpy as np
import argparse
import imutils
import time
import cv2
#from edgetpu.basic.basic_engine import BasicEngine
#from edgetpu.basic import edgetpu_utils

from pycoral.adapters.common import input_size
from pycoral.adapters.detect import get_objects
from pycoral.utils.dataset import read_label_file
from pycoral.utils.edgetpu import make_interpreter
from pycoral.utils.edgetpu import run_inference


import math

fpsstr = ""
framecount = 0
time1 = 0

def rotated_Rectangle(img, rotatedRect, color, thickness=1, lineType=cv2.LINE_8, shift=0):
    (x, y), (width, height), angle = rotatedRect
 
    pt1_1 = (int(x + width / 2), int(y + height / 2))
    pt2_1 = (int(x + width / 2), int(y - height / 2))
    pt3_1 = (int(x - width / 2), int(y - height / 2))
    pt4_1 = (int(x - width / 2), int(y + height / 2))
 
    t = np.array([[np.cos(angle),   -np.sin(angle), x-x*np.cos(angle)+y*np.sin(angle)],
                    [np.sin(angle), np.cos(angle),  y-x*np.sin(angle)-y*np.cos(angle)],
                    [0,             0,              1]])
 
    tmp_pt1_1 = np.array([[pt1_1[0]], [pt1_1[1]], [1]])
    tmp_pt1_2 = np.dot(t, tmp_pt1_1)
    pt1_2 = (int(tmp_pt1_2[0][0]), int(tmp_pt1_2[1][0]))
 
    tmp_pt2_1 = np.array([[pt2_1[0]], [pt2_1[1]], [1]])
    tmp_pt2_2 = np.dot(t, tmp_pt2_1)
    pt2_2 = (int(tmp_pt2_2[0][0]), int(tmp_pt2_2[1][0]))
 
    tmp_pt3_1 = np.array([[pt3_1[0]], [pt3_1[1]], [1]])
    tmp_pt3_2 = np.dot(t, tmp_pt3_1)
    pt3_2 = (int(tmp_pt3_2[0][0]), int(tmp_pt3_2[1][0]))
 
    tmp_pt4_1 = np.array([[pt4_1[0]], [pt4_1[1]], [1]])
    tmp_pt4_2 = np.dot(t, tmp_pt4_1)
    pt4_2 = (int(tmp_pt4_2[0][0]), int(tmp_pt4_2[1][0]))
 
    points = np.array([pt1_2, pt2_2, pt3_2, pt4_2])

    return points
 

def non_max_suppression(boxes, probs=None, angles=None, overlapThresh=0.3):
    # if there are no boxes, return an empty list
    if len(boxes) == 0:
        return [], []

    # if the bounding boxes are integers, convert them to floats -- this
    # is important since we'll be doing a bunch of divisions
    if boxes.dtype.kind == "i":
        boxes = boxes.astype("float")

    # initialize the list of picked indexes
    pick = []

    # grab the coordinates of the bounding boxes
    x1 = boxes[:, 0]
    y1 = boxes[:, 1]
    x2 = boxes[:, 2]
    y2 = boxes[:, 3]

    # compute the area of the bounding boxes and grab the indexes to sort
    # (in the case that no probabilities are provided, simply sort on the bottom-left y-coordinate)
    area = (x2 - x1 + 1) * (y2 - y1 + 1)
    idxs = y2

    # if probabilities are provided, sort on them instead
    if probs is not None:
        idxs = probs

    # sort the indexes
    idxs = np.argsort(idxs)

    # keep looping while some indexes still remain in the indexes list
    while len(idxs) > 0:
        # grab the last index in the indexes list and add the index value to the list of picked indexes
        last = len(idxs) - 1
        i = idxs[last]
        pick.append(i)

        # find the largest (x, y) coordinates for the start of the bounding box and the smallest (x, y) coordinates for the end of the bounding box
        xx1 = np.maximum(x1[i], x1[idxs[:last]])
        yy1 = np.maximum(y1[i], y1[idxs[:last]])
        xx2 = np.minimum(x2[i], x2[idxs[:last]])
        yy2 = np.minimum(y2[i], y2[idxs[:last]])

        # compute the width and height of the bounding box
        w = np.maximum(0, xx2 - xx1 + 1)
        h = np.maximum(0, yy2 - yy1 + 1)

        # compute the ratio of overlap
        overlap = (w * h) / area[idxs[:last]]

        # delete all indexes from the index list that have overlap greater than the provided overlap threshold
        idxs = np.delete(idxs, np.concatenate(([last], np.where(overlap > overlapThresh)[0])))

    # return only the bounding boxes that were picked
    return boxes[pick].astype("int"), angles[pick]

def decode_predictions(scores, geometry1, geometry2):
    # grab the number of rows and columns from the scores volume, then
    # initialize our set of bounding box rectangles and corresponding
    # confidence scores
    (numRows, numCols) = scores.shape[2:4]
    rects = []
    confidences = []
    angles = []

    # loop over the number of rows
    for y in range(0, numRows):
        # extract the scores (probabilities), followed by the
        # geometrical data used to derive potential bounding box
        # coordinates that surround text
        scoresData = scores[0, 0, y]
        xData0 = geometry1[0, 0, y]
        xData1 = geometry1[0, 1, y]
        xData2 = geometry1[0, 2, y]
        xData3 = geometry1[0, 3, y]
        anglesData = geometry2[0, 0, y]

        # loop over the number of columns
        for x in range(0, numCols):
            # if our score does not have sufficient probability, ignore it
            if scoresData[x] < args["min_confidence"]:
                continue

            # compute the offset factor as our resulting feature maps will be 4x smaller than the input image
            (offsetX, offsetY) = (x * 4.0, y * 4.0)

            # extract the rotation angle for the prediction and then compute the sin and cosine
            angle = anglesData[x]
            cos = np.cos(angle)
            sin = np.sin(angle)

            # use the geometry volume to derive the width and height of the bounding box
            h = (xData0[x] + xData2[x])
            w = (xData1[x] + xData3[x])
  
            # compute both the starting and ending (x, y)-coordinates for the text prediction bounding box
            endX = int(offsetX + cos * xData1[x] + sin * xData2[x])
            endY = int(offsetY - sin * xData1[x] + cos * xData2[x])
            startX = int(endX - w)
            startY = int(endY - h)

            # add the bounding box coordinates and probability score to our respective lists
            rects.append((startX, startY, endX, endY))
            confidences.append(scoresData[x])
            angles.append(angle)

	# return a tuple of the bounding boxes and associated confidences
    return (rects, confidences, angles)

# construct the argument parser and parse the arguments
ap = argparse.ArgumentParser()
ap.add_argument("-east", "--east", type=str, default="east_model_int8_edgetpu.tflite", help="path to input EAST text detector")
ap.add_argument("-v", "--video", type=str, help="path to optinal input video file")
ap.add_argument("-c", "--min_confidence", type=float, default=0.5, help="minimum probability required to inspect a region")
ap.add_argument("-w", "--width", type=int, default=320,	help="resized image width (should be multiple of 32)")
ap.add_argument("-e", "--height", type=int, default=320, help="resized image height (should be multiple of 32)")
ap.add_argument("-cw", "--camera_width", type=int, default=640, help='USB Camera resolution (width). (Default=640)')
ap.add_argument("-ch", "--camera_height", type=int, default=480, help='USB Camera resolution (height). (Default=480)')
ap.add_argument('--top_k', type=int, default=3,   help='number of categories with highest score to display')
args = vars(ap.parse_args())

# initialize the original frame dimensions, new frame dimensions,
# and ratio between the dimensions
(W, H) = (None, None)
(newW, newH) = (args["width"], args["height"])
(rW, rH) = (None, None)

# define the two output layer names for the EAST detector model that
# we are interested -- the first is the output probabilities and the
# second can be used to derive the bounding box coordinates of text

# load the pre-trained EAST text detector
print("[INFO] loading EAST text detector...")
#devices = edgetpu_utils.ListEdgeTpuPaths(edgetpu_utils.EDGE_TPU_STATE_UNASSIGNED)
#engine = BasicEngine(model_path=args["east"], device_path=devices[0])


engine = make_interpreter(args["east"])
engine.allocate_tensors()
#labels = read_label_file(args.labels)
inference_size = input_size(engine)


# offset = 0
# output_offsets = [0]
# for size in engine.get_all_output_tensors_sizes():
#     offset += int(size)
#     output_offsets.append(offset)

# if a video path was not supplied, grab the reference to the web cam
# if not args.get("video", False):
#     print("[INFO] starting video stream...")
#     vs = VideoStream(src=0).start()
#     time.sleep(1.0)
# 
# # otherwise, grab a reference to the video file
# else:
#     vs = cv2.VideoCapture(args["video"])

# start the FPS throughput estimator
fps = FPS().start()
cap = cv2.VideoCapture(0)

while True:
    frame=cv2.imread('img_12.jpg')
    cv2_im = frame
# loop over frames from the video stream
#while True:
    t1 = time.perf_counter()

    # grab the current frame, then handle if we are using a
    # VideoStream or VideoCapture object
    #frame = vs.read()
    #frame = frame[1] if args.get("video", False) else frame
    
    
    # check to see if we have reached the end of the stream
    #if frame is None:
        #break
    
    cv2_im_rgb = cv2.cvtColor(cv2_im, cv2.COLOR_BGR2RGB)
    cv2_im_rgb = cv2.resize(cv2_im_rgb, inference_size)
    run_inference(engine, cv2_im_rgb.tobytes())
    
    objs = get_objects(engine, 0.1)
    cv2_im = append_objs_to_img(cv2_im, inference_size, objs, labels)

    cv2.imshow('frame', cv2_im)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

    # resize the frame, maintaining the aspect ratio
#     frame = imutils.resize(frame, width=640)
#     orig = frame.copy()
# 
#     # if our frame dimensions are None, we still need to compute the
#     # ratio of old frame dimensions to new frame dimensions
#     if W is None or H is None:
#         (H, W) = frame.shape[:2]
#         rW = W / float(newW)
#         rH = H / float(newH)
# 
#     # resize the frame, this time ignoring aspect ratio
#     frame = cv2.resize(frame, (newW, newH))

    # construct a blob from the frame and then perform a forward pass
#     # of the model to obtain the two output layer sets
#     frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
#     frame = np.expand_dims(frame, axis=0)
#     frame = frame.astype(np.uint8)
#     inference_time, output = engine.run_inference(frame.flatten())
#     outputs = [output[i:j] for i, j in zip(output_offsets, output_offsets[1:])]
#     scores = outputs[0].reshape(1, int(args["height"]/4), int(args["width"]/4), 1)
#     geometry1 = outputs[1].reshape(1, int(args["height"]/4), int(args["width"]/4), 4)
#     geometry2 = outputs[2].reshape(1, int(args["height"]/4), int(args["width"]/4), 1)
#     scores = np.transpose(scores, [0, 3, 1, 2])
#     geometry1 = np.transpose(geometry1, [0, 3, 1, 2])
#     geometry2 = np.transpose(geometry2, [0, 3, 1, 2])

    # decode the predictions, then  apply non-maxima suppression to
    # suppress weak, overlapping bounding boxes
    (rects, confidences, angles) = decode_predictions(scores, geometry1, geometry2)
    boxes, angles = non_max_suppression(np.array(rects), probs=confidences, angles=np.array(angles))

    # loop over the bounding boxes
    for ((startX, startY, endX, endY), angle) in zip(boxes, angles):
        # scale the bounding box coordinates based on the respective ratios
        startX = int(startX * rW)
        startY = int(startY * rH)
        endX = int(endX * rW)
        endY = int(endY * rH)

        # draw the bounding box on the frame
        width   = abs(endX - startX)
        height  = abs(endY - startY)
        centerX = int(startX + width / 2)
        centerY = int(startY + height / 2)

        rotatedRect = ((centerX, centerY), ((endX - startX), (endY - startY)), -angle)
        points = rotated_Rectangle(orig, rotatedRect, color=(0, 255, 0), thickness=2)
        cv2.polylines(orig, [points], isClosed=True, color=(0, 255, 0), thickness=2, lineType=cv2.LINE_8, shift=0)
        cv2.putText(orig, fpsstr, (args["camera_width"]-170,15), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (38,0,255), 1, cv2.LINE_AA)

    # update the FPS counter
    fps.update()

    # show the output frame
    cv2.imshow("Text Detection", orig)
    if cv2.waitKey(1)&0xFF == ord('q'):
        break

    # FPS calculation
    framecount += 1
    if framecount >= 10:
        fpsstr = "(Playback) {:.1f} FPS".format(time1/10)
        framecount = 0
        time1 = 0
    t2 = time.perf_counter()
    elapsedTime = t2-t1
    time1 += 1/elapsedTime

# stop the timer and display FPS information
#fps.stop()
print("[INFO] elasped time: {:.2f}".format(fps.elapsed()))
print("[INFO] approx. FPS: {:.2f}".format(fps.fps()))

# if we are using a webcam, release the pointer
if not args.get("video", False):
    vs.stop()

# otherwise, release the file pointer
else:
    vs.release()

# close all windows
cv2.destroyAllWindows()

it returns:

Traceback (most recent call last):
  File "/home/pi/east_test/test_tf2.py", line 242, in <module>
    objs = get_objects(engine, 0.1)
  File "/home/pi/.local/lib/python3.9/site-packages/pycoral/adapters/detect.py", line 214, in get_objects
    elif common.output_tensor(interpreter, 3).size == 1:
  File "/home/pi/.local/lib/python3.9/site-packages/pycoral/adapters/common.py", line 29, in output_tensor
    return interpreter.tensor(interpreter.get_output_details()[i]['index'])()
IndexError: list index out of range

here`s model:
https://drive.google.com/file/d/1fNZYONsMnpa6_w0ekf0Jjpc10QDXn2in/view?usp=sharing

i fixed code for tflite but not for edgetpu - https://github.com/zoldaten/PINTO_model_zoo/blob/main/051_East_Text_Detection/text_detection_video_tflite.py

[jveitchmichaelis]

Hi

I'm not familiar with this model, so without more information I can't help much. What architecture is it? Please could you re-post a minimal example without any of the additional code - i.e. load the weights, make a fake input and run it through the EdgeTPU interpreter.

See https://github.com/jveitchmichaelis/edgetpu-yolo/blob/main/edgetpumodel.py for example.

• What weights are you using?
• Have you compiled the model to EdgeTPU? If so, how?
• Can you run the model at all, or is it an issue with the output format?

Thanks

[zoldaten]

i fixed code for tflite but not for edgetpu - https://github.com/zoldaten/PINTO_model_zoo/blob/main/051_East_Text_Detection/text_detection_video_tflite.py

here is working code for tflite model.

• What weights are you using?
  https://www.kaggle.com/models/spsayakpaul/east-text-detector/tfLite/int8

• Have you compiled the model to EdgeTPU? If so, how?
  edgetpu_compiler -m 13 1.tflite

• Can you run the model at all, or is it an issue with the output format?
  Sure, but without edge_tpu - https://youtu.be/OgjtP2O7sp4

[jveitchmichaelis]

In your first post it looks like the forward pass runs fine, but you aren't interpreting the output correctly. What if you don't use the detect framework and just print the output tensor? detect makes assumptions about your model architecture which may not be correct (e.g. I think it assumes you're using mobilenet-ssd - we don't use it for YOLO).

If you look at how prediction is done in this repository, it's basically the same as your tflite example - use set_tensor to load the input and then run invoke. We don't use the Engine.

Have you tried the instructions from the docs?