手势检测
1.学习目的
学习摄像头的画面进行手势检测。
2.示例代码
'''
本程序遵循GPL V3协议, 请遵循协议
实验平台： DshanPI CanMV
开发板文档站点 : https://eai.100ask.net/
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百问网官方淘宝 : https://100ask.taobao.com
'''
from libs.PipeLine import PipeLine, ScopedTiming
from libs.AIBase import AIBase
from libs.AI2D import Ai2d
import os
import ujson
from media.media import *
from time import *
import nncase_runtime as nn
import ulab.numpy as np
import time
import image
import aicube
import random
import gc
import sys
# 自定义手掌检测任务类
class HandDetApp(AIBase):
def __init__(self,kmodel_path,model_input_size,anchors,confidence_threshold=0.2,nms_threshold=0.5,nms_option=False, strides=[8,16,32],rgb888p_size=[1920,1080],display_size=[1920,1080],debug_mode=0):
super().__init__(kmodel_path,model_input_size,rgb888p_size,debug_mode)
# kmodel路径
self.kmodel_path=kmodel_path
# 检测模型输入分辨率
self.model_input_size=model_input_size
# 置信度阈值
self.confidence_threshold=confidence_threshold
# nms阈值
self.nms_threshold=nms_threshold
# 锚框,目标检测任务使用
self.anchors=anchors
# 特征下采样倍数
self.strides = strides
# NMS选项，如果为True做类间NMS,如果为False做类内NMS
self.nms_option = nms_option
# sensor给到AI的图像分辨率，宽16字节对齐
self.rgb888p_size=[ALIGN_UP(rgb888p_size[0],16),rgb888p_size[1]]
# 视频输出VO分辨率，宽16字节对齐
self.display_size=[ALIGN_UP(display_size[0],16),display_size[1]]
# debug模式
self.debug_mode=debug_mode
# Ai2d实例用于实现预处理
self.ai2d=Ai2d(debug_mode)
# 设置ai2d的输入输出的格式和数据类型
self.ai2d.set_ai2d_dtype(nn.ai2d_format.NCHW_FMT,nn.ai2d_format.NCHW_FMT,np.uint8, np.uint8)
# 配置预处理操作，这里使用了pad和resize，Ai2d支持crop/shift/pad/resize/affine，具体代码请打开/sdcard/app/libs/AI2D.py查看
def config_preprocess(self,input_image_size=None):
with ScopedTiming("set preprocess config",self.debug_mode > 0):
# 初始化ai2d预处理配置，默认为sensor给到AI的尺寸，可以通过设置input_image_size自行修改输入尺寸
ai2d_input_size = input_image_size if input_image_size else self.rgb888p_size
# 计算padding参数并应用pad操作，以确保输入图像尺寸与模型输入尺寸匹配
top, bottom, left, right = self.get_padding_param()
self.ai2d.pad([0, 0, 0, 0, top, bottom, left, right], 0, [114, 114, 114])
# 使用双线性插值进行resize操作，调整图像尺寸以符合模型输入要求
self.ai2d.resize(nn.interp_method.tf_bilinear, nn.interp_mode.half_pixel)
# 构建预处理流程,参数为预处理输入tensor的shape和预处理输出的tensor的shape
self.ai2d.build([1,3,ai2d_input_size[1],ai2d_input_size[0]],[1,3,self.model_input_size[1],self.model_input_size[0]])
# 自定义当前任务的后处理，用于处理模型输出结果，这里使用了aicube库的anchorbasedet_post_process接口
def postprocess(self,results):
with ScopedTiming("postprocess",self.debug_mode > 0):
dets = aicube.anchorbasedet_post_process(results[0], results[1], results[2], self.model_input_size, self.rgb888p_size, self.strides,1, self.confidence_threshold, self.nms_threshold, self.anchors, self.nms_option)
# 返回手掌检测结果
return dets
# 计算padding参数，确保输入图像尺寸与模型输入尺寸匹配
def get_padding_param(self):
# 根据目标宽度和高度计算比例因子
dst_w = self.model_input_size[0]
dst_h = self.model_input_size[1]
input_width = self.rgb888p_size[0]
input_high = self.rgb888p_size[1]
ratio_w = dst_w / input_width
ratio_h = dst_h / input_high
# 选择较小的比例因子，以确保图像内容完整
if ratio_w < ratio_h:
ratio = ratio_w
else:
ratio = ratio_h
# 计算新的宽度和高度
new_w = int(ratio * input_width)
new_h = int(ratio * input_high)
# 计算宽度和高度的差值，并确定padding的位置
dw = (dst_w - new_w) / 2
dh = (dst_h - new_h) / 2
top = int(round(dh - 0.1))
bottom = int(round(dh + 0.1))
left = int(round(dw - 0.1))
right = int(round(dw + 0.1))
return top, bottom, left, right
# 自定义手势识别任务类
class HandRecognitionApp(AIBase):
def __init__(self,kmodel_path,model_input_size,labels,rgb888p_size=[1920,1080],display_size=[1920,1080],debug_mode=0):
super().__init__(kmodel_path,model_input_size,rgb888p_size,debug_mode)
# kmodel路径
self.kmodel_path=kmodel_path
# 检测模型输入分辨率
self.model_input_size=model_input_size
self.labels=labels
# sensor给到AI的图像分辨率，宽16字节对齐
self.rgb888p_size=[ALIGN_UP(rgb888p_size[0],16),rgb888p_size[1]]
# 视频输出VO分辨率，宽16字节对齐
self.display_size=[ALIGN_UP(display_size[0],16),display_size[1]]
self.crop_params=[]
# debug模式
self.debug_mode=debug_mode
# Ai2d实例用于实现预处理
self.ai2d=Ai2d(debug_mode)
# 设置ai2d的输入输出的格式和数据类型
self.ai2d.set_ai2d_dtype(nn.ai2d_format.NCHW_FMT,nn.ai2d_format.NCHW_FMT,np.uint8, np.uint8)
# 配置预处理操作，这里使用了crop和resize，Ai2d支持crop/shift/pad/resize/affine，具体代码请打开/sdcard/app/libs/AI2D.py查看
def config_preprocess(self,det,input_image_size=None):
with ScopedTiming("set preprocess config",self.debug_mode > 0):
ai2d_input_size=input_image_size if input_image_size else self.rgb888p_size
self.crop_params = self.get_crop_param(det)
self.ai2d.crop(self.crop_params[0],self.crop_params[1],self.crop_params[2],self.crop_params[3])
self.ai2d.resize(nn.interp_method.tf_bilinear, nn.interp_mode.half_pixel)
self.ai2d.build([1,3,ai2d_input_size[1],ai2d_input_size[0]],[1,3,self.model_input_size[1],self.model_input_size[0]])
# 自定义后处理，results是模型输出的array列表
def postprocess(self,results):
with ScopedTiming("postprocess",self.debug_mode > 0):
result=results[0].reshape(results[0].shape[0]*results[0].shape[1])
x_softmax = self.softmax(result)
idx = np.argmax(x_softmax)
text = " " + self.labels[idx] + ": " + str(round(x_softmax[idx],2))
return text
# 计算crop参数
def get_crop_param(self,det_box):
x1, y1, x2, y2 = det_box[2],det_box[3],det_box[4],det_box[5]
w,h= int(x2 - x1),int(y2 - y1)
w_det = int(float(x2 - x1) * self.display_size[0] // self.rgb888p_size[0])
h_det = int(float(y2 - y1) * self.display_size[1] // self.rgb888p_size[1])
x_det = int(x1*self.display_size[0] // self.rgb888p_size[0])
y_det = int(y1*self.display_size[1] // self.rgb888p_size[1])
length = max(w, h)/2
cx = (x1+x2)/2
cy = (y1+y2)/2
ratio_num = 1.26*length
x1_kp = int(max(0,cx-ratio_num))
y1_kp = int(max(0,cy-ratio_num))
x2_kp = int(min(self.rgb888p_size[0]-1, cx+ratio_num))
y2_kp = int(min(self.rgb888p_size[1]-1, cy+ratio_num))
w_kp = int(x2_kp - x1_kp + 1)
h_kp = int(y2_kp - y1_kp + 1)
return [x1_kp, y1_kp, w_kp, h_kp]
# softmax实现
def softmax(self,x):
x -= np.max(x)
x = np.exp(x) / np.sum(np.exp(x))
return x
class HandRecognition:
def __init__(self,hand_det_kmodel,hand_kp_kmodel,det_input_size,kp_input_size,labels,anchors,confidence_threshold=0.25,nms_threshold=0.3,nms_option=False,strides=[8,16,32],rgb888p_size=[1280,720],display_size=[1920,1080],debug_mode=0):
# 手掌检测模型路径
self.hand_det_kmodel=hand_det_kmodel
# 手掌关键点模型路径
self.hand_kp_kmodel=hand_kp_kmodel
# 手掌检测模型输入分辨率
self.det_input_size=det_input_size
# 手掌关键点模型输入分辨率
self.kp_input_size=kp_input_size
self.labels=labels
# anchors
self.anchors=anchors
# 置信度阈值
self.confidence_threshold=confidence_threshold
# nms阈值
self.nms_threshold=nms_threshold
# nms选项
self.nms_option=nms_option
# 特征图针对输出的下采样倍数
self.strides=strides
# sensor给到AI的图像分辨率，宽16字节对齐
self.rgb888p_size=[ALIGN_UP(rgb888p_size[0],16),rgb888p_size[1]]
# 视频输出VO分辨率，宽16字节对齐
self.display_size=[ALIGN_UP(display_size[0],16),display_size[1]]
# debug_mode模式
self.debug_mode=debug_mode
self.hand_det=HandDetApp(self.hand_det_kmodel,model_input_size=self.det_input_size,anchors=self.anchors,confidence_threshold=self.confidence_threshold,nms_threshold=self.nms_threshold,nms_option=self.nms_option,strides=self.strides,rgb888p_size=self.rgb888p_size,display_size=self.display_size,debug_mode=0)
self.hand_rec=HandRecognitionApp(self.hand_kp_kmodel,model_input_size=self.kp_input_size,labels=self.labels,rgb888p_size=self.rgb888p_size,display_size=self.display_size)
self.hand_det.config_preprocess()
# run函数
def run(self,input_np):
# 执行手掌检测
det_boxes=self.hand_det.run(input_np)
hand_rec_res=[]
hand_det_res=[]
for det_box in det_boxes:
# 对检测到的每一个手掌执行手势识别
x1, y1, x2, y2 = det_box[2],det_box[3],det_box[4],det_box[5]
w,h= int(x2 - x1),int(y2 - y1)
if (h<(0.1*self.rgb888p_size[1])):
continue
if (w<(0.25*self.rgb888p_size[0]) and ((x1<(0.03*self.rgb888p_size[0])) or (x2>(0.97*self.rgb888p_size[0])))):
continue
if (w<(0.15*self.rgb888p_size[0]) and ((x1<(0.01*self.rgb888p_size[0])) or (x2>(0.99*self.rgb888p_size[0])))):
continue
self.hand_rec.config_preprocess(det_box)
text=self.hand_rec.run(input_np)
hand_det_res.append(det_box)
hand_rec_res.append(text)
return hand_det_res,hand_rec_res
# 绘制效果，绘制识别结果和检测框
def draw_result(self,pl,hand_det_res,hand_rec_res):
pl.osd_img.clear()
if hand_det_res:
for k in range(len(hand_det_res)):
det_box=hand_det_res[k]
x1, y1, x2, y2 = det_box[2],det_box[3],det_box[4],det_box[5]
w,h= int(x2 - x1),int(y2 - y1)
w_det = int(float(x2 - x1) * self.display_size[0] // self.rgb888p_size[0])
h_det = int(float(y2 - y1) * self.display_size[1] // self.rgb888p_size[1])
x_det = int(x1*self.display_size[0] // self.rgb888p_size[0])
y_det = int(y1*self.display_size[1] // self.rgb888p_size[1])
pl.osd_img.draw_rectangle(x_det, y_det, w_det, h_det, color=(255, 0, 255, 0), thickness = 2)
pl.osd_img.draw_string_advanced( x_det, y_det-50, 32,hand_rec_res[k], color=(255,0, 255, 0))
if __name__=="__main__":
# 显示模式，默认"hdmi",可以选择"hdmi"和"lcd"
display_mode="lcd"
# k230保持不变，k230d可调整为[640,360]
rgb888p_size = [1920, 1080]
if display_mode=="hdmi":
display_size=[1920,1080]
else:
display_size=[800,480]
# 手掌检测模型路径
hand_det_kmodel_path="/sdcard/examples/kmodel/hand_det.kmodel"
# 手势识别模型路径
hand_rec_kmodel_path="/sdcard/examples/kmodel/hand_reco.kmodel"
# 其它参数
anchors_path="/sdcard/examples/utils/prior_data_320.bin"
hand_det_input_size=[512,512]
hand_rec_input_size=[224,224]
confidence_threshold=0.2
nms_threshold=0.5
labels=["gun","other","yeah","five"]
anchors = [26,27, 53,52, 75,71, 80,99, 106,82, 99,134, 140,113, 161,172, 245,276]
# 初始化PipeLine，只关注传给AI的图像分辨率，显 示的分辨率
pl=PipeLine(rgb888p_size=rgb888p_size,display_size=display_size,display_mode=display_mode)
pl.create()
hr=HandRecognition(hand_det_kmodel_path,hand_rec_kmodel_path,det_input_size=hand_det_input_size,kp_input_size=hand_rec_input_size,labels=labels,anchors=anchors,confidence_threshold=confidence_threshold,nms_threshold=nms_threshold,nms_option=False,strides=[8,16,32],rgb888p_size=rgb888p_size,display_size=display_size)
try:
while True:
os.exitpoint()
with ScopedTiming("total",1):
img=pl.get_frame() # 获取当前帧
hand_det_res,hand_rec_res=hr.run(img) # 推理当前帧
hr.draw_result(pl,hand_det_res,hand_rec_res) # 绘制推理结果
pl.show_image() # 展示推理结果
gc.collect()
except Exception as e:
sys.print_exception(e)
finally:
hr.hand_det.deinit()
hr.hand_rec.deinit()
pl.destroy()
3.实验结果
点击运行代码后可以查看手势检测结果：
